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Nam OH, Kim JH, Kang SW, Chae YK, Jih MK, You HH, Koh JT, Kim Y. Ginsenoside Rb1 alleviates lipopolysaccharide-induced inflammation in human dental pulp cells via the PI3K/Akt, NF-κB, and MAPK signalling pathways. Int Endod J 2024; 57:759-768. [PMID: 38436525 DOI: 10.1111/iej.14058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 02/19/2024] [Accepted: 02/20/2024] [Indexed: 03/05/2024]
Abstract
AIM Among numerous constituents of Panax ginseng, a constituent named Ginsenoside Rb1 (G-Rb1) has been studied to diminish inflammation associated with diseases. This study investigated the anti-inflammatory properties of G-Rb1 on human dental pulp cells (hDPCs) exposed to lipopolysaccharide (LPS) and aimed to determine the underlying molecular mechanisms. METHODOLOGY The KEGG pathway analysis was performed after RNA sequencing in G-Rb1- and LPS-treated hDPCs. Reverse-transcription polymerase chain reaction (RT-PCR) and western blot analysis were used for the assessment of cell adhesion molecules and inflammatory cytokines. Statistical analysis was performed with one-way ANOVA and the Student-Newman-Keuls test. RESULTS G-Rb1 did not exhibit any cytotoxicity within the range of concentrations tested. However, it affected the levels of TNF-α, IL-6 and IL-8, as these showed reduced levels with exposure to LPS. Additionally, less mRNA and protein expressions of vascular cell adhesion molecule-1 (VCAM-1) and intercellular adhesion molecule-1 (ICAM-1) were shown. With the presence of G-Rb1, decreased levels of PI3K/Akt, phosphorylated IκBα and p65 were also observed. Furthermore, phosphorylated ERK and JNK by LPS were diminished within 15, 30 and 60 min of G-Rb1 exposure; however, the expression of non-phosphorylated ERK and JNK remained unchanged. CONCLUSIONS G-Rb1 suppressed the LPS-induced increase of cell adhesion molecules and inflammatory cytokines, while also inhibiting PI3K/Akt, phosphorylation of NF-κB transcription factors, ERK and JNK of MAPK signalling in hDPCs.
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Affiliation(s)
- Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Jae-Hwan Kim
- Department of Pediatric Dentistry, School of Dentistry, Jeonbuk National University, Jeonju, Korea
| | - Si Won Kang
- Department of Oral Pathology, School of Dentistry, Chonnam National University, Gwangju, Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Myeong-Kwan Jih
- Department of Pediatric Dentistry, School of Dentistry, Chosun University, Gwangju, Korea
| | - Hyekyoung Hannah You
- Department of Oral Pathology, School of Dentistry, Chonnam National University, Gwangju, Korea
| | - Jeong-Tae Koh
- Department of Pharmacology and Dental Therapeutics, Hard-tissue Biointerface Research Center, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Korea
| | - Young Kim
- Department of Oral Pathology, School of Dentistry, Chonnam National University, Gwangju, Korea
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Nam OH, Chung SY, Hyun HK, Ye JR, Jeong Y, Oh SE, Chae YK, Lee H. Influence of postprinting cleaning methods on the cleaning efficiency and surface and mechanical properties of three-dimensionally printed resins. J Prosthet Dent 2024:S0022-3913(24)00151-3. [PMID: 38582709 DOI: 10.1016/j.prosdent.2024.02.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 02/24/2024] [Accepted: 02/27/2024] [Indexed: 04/08/2024]
Abstract
STATEMENT OF PROBLEM The outcome of photopolymerized 3-dimensional (3D) printing is influenced by the methods used for postprinting cleaning, yet information on postprinting cleaning is sparse. PURPOSE The purpose of this in vitro study was to assess the cleaning efficiency and surface and mechanical properties of 3D printed resin according to postprinting cleaning methods. MATERIAL AND METHODS Specimens were fabricated from a 3D model using resin materials (NextDent C&B MFH and DIOnavi-P. MAX) and were tested for postprinting cleaning methods for 5 minutes with isopropyl alcohol, isopropyl alcohol + ultrasonic, ethyl alcohol, ethyl alcohol + ultrasonic, and ultrasonic alone. Postpolymerization was followed for 5 minutes. The cleaning efficiency, microcomputed tomography (µCT), surface roughness, Vickers hardness, and flexural strength of the specimens were evaluated. The 1-way ANOVA test was performed after considering normality. A post hoc analysis with Bonferroni was also performed (α=.008 or.005). RESULTS Ultrasonic in addition to cleaning solutions significantly improved the cleaning efficiency in NextDent C&B MFH specimens (P<.005), whereas ultrasonic did not affect the efficiency in DIOnavi-P. MAX specimens. No significant differences were found in surface roughness by postprinting cleaning methods in either NextDent C&B MFH or DIOnavi-P. MAX (P>.005). No significant changes in surface hardness were observed by postprinting cleaning methods (P>.008). In the NextDent C&B MFH, ethyl alcohol + ultrasonic significantly decreased the flexural strength (P<.005). There were no significant differences in the flexural strength in the DIOnavi-P. MAX (P>.005). CONCLUSIONS Ethyl alcohol was comparable with isopropyl alcohol for use as a postprinting cleaning solution for both NextDent C&B MFH and DIOnavi-P. MAX. The addition of ultrasonic to cleaning solutions should be applied with caution. These findings suggest that different postprinting cleaning methods can be recommended depending on the 3D printed resin materials.
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Affiliation(s)
- Ok Hyung Nam
- Associate Professor, Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, Seoul, Republic of Korea; and Associate Professor, Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Sang-Yeop Chung
- Associate Professor, Department of Civil and Environmental Engineering, Yonsei University, Seoul, Republic of Korea
| | - Hong-Keun Hyun
- Professor, Department of Pediatric Dentistry, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Ju Ri Ye
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Republic of Korea
| | - Yuwon Jeong
- PhD student, Department of Prosthodontics, College of Dentistry, Yonsei University, Seoul, Republic of Korea
| | - Seo-Eun Oh
- PhD student, Department of Civil and Environmental Engineering, Yonsei University, Seoul, Republic of Korea
| | - Yong Kwon Chae
- Clinical Assistant Professor, Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, Seoul, Republic of Korea
| | - Hyeonjong Lee
- Associate Professor, Department of Prosthodontics, College of Dentistry, Yonsei University, Seoul, Republic of Korea.
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Herr L, Ye JR, Kang SW, Ro ST, Chae YK, Lee KE, Kim MS, Jih MK, Lee C, Choi SC, Nam OH. Effect of intra-alveolar delivery of Frondoside A on inflammatory response of delayed tooth replantation. Dent Traumatol 2024; 40:178-186. [PMID: 37731288 DOI: 10.1111/edt.12891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 09/07/2023] [Accepted: 09/07/2023] [Indexed: 09/22/2023]
Abstract
BACKGROUND/AIM Frondoside A is a sea cucumber extract which is well known for its anti-inflammatory and immunomodulatory properties. The purpose of this study was to evaluate the effect of Frondoside A application in the alveolar socket on inflammatory responses after delayed replantation in rat teeth. MATERIALS AND METHODS Human periodontal ligament cells were cultured and exposed to Frondoside A. Cell-counting kit-8 assay was performed to evaluate the cell viability and nitric oxide assay was performed to assess the anti-inflammatory effect of Frondoside A. Molars were extracted from 32 Sprague-Dawley rats and randomly divided into control and Frondoside A groups. After 30 min of extra-oral dry time, molars were replanted. In the Frondoside A group, Frondoside A solution was applied in the alveolar socket before replantation. The animals were sacrificed after 28 days and histologically and immunohistochemically evaluated. RESULTS 0.5 μM Frondoside A showed higher cellular viability at 6 h and lower production of nitric oxide compared with other Frondoside A solutions (p < .05). The Frondoside A group demonstrated lower inflammatory resorption scores in both middle 1/3 and apical 1/3 of root compared to the control group (p < .05). The Frondoside A group showed lower levels of expression in both cathepsin K and CD45 compared with the control group (p < .05). CONCLUSIONS Within the limits of this study, intra-alveolar delivery of Frondoside A alleviates inflammatory root resorption in delayed replantation of rat teeth.
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Affiliation(s)
- Lar Herr
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Ju Ri Ye
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Sang Tae Ro
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Ko Eun Lee
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Mi Sun Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Myeong Kwan Jih
- Department of Pediatric Dentistry, School of Dentistry, Chosun University, Gwangju, South Korea
| | - Chunui Lee
- Department of Oral and Maxillofacial Surgery, Wonju College of Medicine, Yonsei University, Wonju, South Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
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Ko MJ, Kim MS, Lee HS, Nam OH, Chae YK, Choi SC. Effects of Doxycycline-Loaded NO-Releasing Nanomatrix Gel on Delayed Replanted of Rat Molar. Gels 2024; 10:213. [PMID: 38667632 PMCID: PMC11049325 DOI: 10.3390/gels10040213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2024] [Revised: 03/06/2024] [Accepted: 03/14/2024] [Indexed: 04/28/2024] Open
Abstract
BACKGROUND/AIM Tooth avulsion and delayed replantation may cause inflammatory responses and root resorption of the tooth. The aim of this study is to investigate the effect of a doxycycline-loaded nitric oxide-releasing nanomatrix (DN) gel on the delayed replantation of avulsed rat teeth, with a focus on assessing the gel's potential to promote regeneration and inhibit complications associated with the replantation process. MATERIALS AND METHODS Twenty-four right maxillary first molars from male Sprague-Dawley rats were atraumatically extracted using sterile extraction forceps. The molars were dried for 1 h at room temperature (approximately 23 °C) and divided into four groups according to the root conditioning methods after extra-alveolar 60-min drying: Group 1, no root conditioning treatment prior to replantation; Group 2, soaking in 2% NaF solution for 5 min before replantation; Group 3, 5-min soaking in NO gel and injection of the gel into the alveolar socket; Group 4, 5-min soaking in DN gel and injection of the gel into the alveolar socket before replantation. The animals were euthanized four weeks after the operation and the specimens were evaluated histologically. RESULTS The use of NO gel alone showed better anti-inflammatory and periodontal effects than the control group, but it did not show a significant effect compared to the group using NaF. When using NO gel loaded with doxycycline, it showed a significant anti-inflammatory effect compared to the control group and showed a similar inhibitory effect to the group using NaF. CONCLUSIONS Within the limits of this study, in delayed replantation situations, the control of inflammatory resorption and replacement resorption is an important factor for achieving a better prognosis of replanted teeth. Root surface treatment with DN gel decreased root resorption after delayed replantation.
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Affiliation(s)
- Mi Ja Ko
- Children Loving Dental Clinic, Seosan 31978, Republic of Korea;
| | - Mi Sun Kim
- Department of Pediatric Dentistry, College of Dentistry, Kyung Hee University, Kyung Hee University Hospital at Gangdong, Seoul 05278, Republic of Korea;
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, College of Dentistry, Kyung Hee University, Kyung Hee University Medical Center, Seoul 02447, Republic of Korea; (H.-S.L.)
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, College of Dentistry, Kyung Hee University, Kyung Hee University Medical Center, Seoul 02447, Republic of Korea; (H.-S.L.)
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University Medical Center, Seoul 02447, Republic of Korea;
| | - Sung Chul Choi
- Department of Pediatric Dentistry, College of Dentistry, Kyung Hee University, Kyung Hee University Medical Center, Seoul 02447, Republic of Korea; (H.-S.L.)
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Lee JH, Lee KE, Kang SW, Park SH, Chae YK, Lee MH, Kweon DK, Choi SC, Nam OH. Effect of orodispersible hyaluronic acid film on palatal mucosa wound healing. Oral Dis 2024; 30:518-527. [PMID: 36691707 DOI: 10.1111/odi.14517] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 12/23/2022] [Accepted: 01/20/2023] [Indexed: 01/25/2023]
Abstract
OBJECTIVE The objective of the study was to evaluate the healing effect of hyaluronic acid films on palatal wounds. MATERIALS AND METHODS After making 5-mm diameter palatal wounds, 72 rats were randomly assigned to three groups: control, hyaluronic acid gel, and hyaluronic acid film. The animals were sacrificed at 3, 7, and 21 days after the experiment. Clinical, histological, and RT-PCR analyses were performed. Human ex vivo oral mucosa models were used. Histological analysis and pan-cytokeratin staining were performed at 5 days after wound creation. RESULTS In rat model, both gels and films showed favorable healing on Days 3 and 7 compared with healing in the control (p < 0.05). Film showed remarkable VEGF and α-SMA expression than did the others (p < 0.05). Immunohistochemical analysis showed that film exhibited significantly lower CD68 and greater α-SMA and vimentin expression levels than those in the others (p < 0.05). In human model, re-epithelialization rate of film group was significantly higher than that of the others. Complete epithelial regeneration was confirmed only in film group using pan-cytokeratin staining. CONCLUSIONS Within the limits of this study, hyaluronic acid film outperformed gels in terms of palatal wound healing in both models.
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Affiliation(s)
- Jeong Hyun Lee
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Ko Eun Lee
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, South Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Seung Hwan Park
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Yong Kwon Chae
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, South Korea
| | | | | | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, South Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, South Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
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Lee KE, Koo JY, Ye JR, Chae YK, Lee HS, Choi SC, Nam OH. Three-dimensional analysis of the alveolar ridge profiles of maxillary central incisors in children for autotransplantation. Ann Anat 2024; 252:152193. [PMID: 38016625 DOI: 10.1016/j.aanat.2023.152193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 10/10/2023] [Accepted: 10/27/2023] [Indexed: 11/30/2023]
Abstract
BACKGROUND Sufficient alveolar housing is fundamental to ensure the favorable prognosis of autotransplanted teeth. However, little is known about the alveolar ridge profiles of the anterior maxilla in children. Therefore, this study aimed to investigate the alveolar ridge profiles of the anterior maxilla in growing children. METHODS A total of 169 Korean children aged 10-13 years old were included in this retrospective study. Demographic data and cone-beam computed tomography scans of 244 maxillary central incisors were collected. For each tooth, the alveolar ridge thickness was determined at 1-, 3-, and 5-mm levels below the cemento-enamel junction. The alveolar process height and labial concavity were also evaluated. Statistical analyses were performed to evaluate differences according to age and sex. RESULTS The alveolar ridge thickness did not differ according to age. The alveolar ridge thickness in males was significantly greater than that in females among those aged 10 and 11 years. The average alveolar process height was 17.43 ± 2.22 mm. The alveolar process height hardly changed with age from 10-13 years, whereas the alveolar process height of males was significantly greater compared with that of females among those aged 10 years. The labial concavity was approximately 150˚, with no significant differences between age and sex. CONCLUSIONS Within the limits of this study, the anatomy of the alveolar ridge in the maxillary central incisors showed sufficient capacity as a recipient site for autotransplantation using mandibular premolars, especially in males. These findings serve as a valuable resource for facilitating autotransplantation in children.
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Affiliation(s)
- Ko Eun Lee
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Joon Young Koo
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea; Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Ju Ri Ye
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea; Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea; Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, South Korea; Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea.
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Park SH, Ye JR, Asiri NM, Chae YK, Choi SC, Nam OH. Biocompatibility and Bioactivity of a Dual-Cured Resin-Based Calcium Silicate Cement: In Vitro and in vivo Evaluation. J Endod 2024; 50:235-242. [PMID: 37995904 DOI: 10.1016/j.joen.2023.11.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Revised: 11/02/2023] [Accepted: 11/16/2023] [Indexed: 11/25/2023]
Abstract
INTRODUCTION This study aimed to assess the biocompatibility and bioactivity of a dual-cured resin-based calcium silicate cement in vitro and in vivo. METHODS For in vitro analyses, standardized samples were prepared using TheraCal LC, TheraCal PT, and ProRoot MTA. The amount of residual monomer released from TheraCal LC and TheraCal PT was assessed using liquid chromatography/mass spectrometry. Calcium ion release from the materials was evaluated using inductively coupled plasma-optical emission spectroscopy. Scanning electron microscopy and energy-dispersive X-ray spectroscopy were used to determine the calcium weight volume in the materials. For in vivo analysis, a rat direct pulp capping model with TheraCal LC, TheraCal PT, and ProRoot MTA groups (n = 16 per group) was used. The rats were euthanized after 7 or 28 days, and histological and immunohistochemical analyses (CD68 and DSPP) were performed. RESULTS Bisphenol A-glycidyl methacrylate and polyethylene glycol dimethacrylate release from TheraCal PT was lower than that from TheraCal LC (P < .05). Similar results were obtained for calcium-ion release and calcium weight volume, with ProRoot MTA showing the highest values. In the in vivo evaluation, TheraCal PT showed significantly greater hard tissue formation than TheraCal LC (P < .017). TheraCal PT showed lower CD68 expression and greater DSPP expression than TheraCal LC (P < .017). There were no significant differences in the expression of CD68 or DSPP between the TheraCal PT and ProRoot MTA groups. CONCLUSIONS Within the limitations of this study, the biocompatibility and bioactivity of TheraCal PT could be comparable to those of ProRoot MTA.
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Affiliation(s)
- Seung Hwan Park
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, Korea
| | - Ju Ri Ye
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, Korea
| | - Naif Mohammed Asiri
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, Korea; Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, Korea; Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea.
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Ye JR, Lee HY, Park YJ, Chae YK, An HJ, Baek JS, Nam OH. Accelerated Oral Healing by Angelica gigas Nakai from Hot Melt Extrusion Technology: An In Vitro Study. Medicina (Kaunas) 2023; 59:2066. [PMID: 38138169 PMCID: PMC10744353 DOI: 10.3390/medicina59122066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 11/16/2023] [Accepted: 11/21/2023] [Indexed: 12/24/2023]
Abstract
Background and Objectives: In spite of the oral environment being healing-prone, its dynamic changes may affect wound healing. The purpose of this study was to assess the oral wound healing effect of Angelica gigas Nakai (AG) prepared by hot-melt extrusion. Materials and Methods: Human gingival fibroblast (HGF) cells were treated with AG or AG via hot-melt extrusion (AGH) for 24 h to determine the optimal concentration. For evaluating the anti-inflammatory effect of AG and AGH, a nitric oxide assay was performed under lipopolysaccharide (LPS) stimulation. The wound-healing effects of AG and AGH were evaluated using cell proliferation/migration assays and wound-healing marker expression through qRT-PCR. Results: Both AG and AGH showed no cytotoxicity on HGH cells. Regarding nitric oxide production, AGH significantly decreased LPS-induced nitric oxide production (p < 0.05). AGH showed a significantly positive result in the cell proliferation/cell migration assay compared with that in AG and the control. Regarding wound healing marker expression, AGH showed significantly greater VEGF and COL1α1 expression levels than those in the others (p < 0.05), whereas α-SMA expression was significantly different among the groups. Conclusions: Within the limits of this study, AGH accelerated oral wound healing in vitro.
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Affiliation(s)
- Ju Ri Ye
- Department of Pediatric Dentistry, Kyung Hee University Medical Center, College of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea; (J.R.Y.); (Y.K.C.)
| | - Ha Yeon Lee
- Department of Bio-Health Convergence, Kangwon National University, Chuncheon 24341, Republic of Korea;
| | - Yea-Jin Park
- Department of Rehabilitative Medicine of Korean Medicine and Neuropsychiatry, College of Korean Medicine, Sangji University, Wonju 26339, Republic of Korea;
- Department of Oriental Pharmaceutical Science, College of Pharmacy, Kyung Hee University, Seoul 02447, Republic of Korea;
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University Medical Center, College of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea; (J.R.Y.); (Y.K.C.)
| | - Hyo-Jin An
- Department of Oriental Pharmaceutical Science, College of Pharmacy, Kyung Hee University, Seoul 02447, Republic of Korea;
| | - Jong-Suep Baek
- Department of Bio-Health Convergence, Kangwon National University, Chuncheon 24341, Republic of Korea;
- BeNatureBioLab, Chuncheon 24206, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University Medical Center, College of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea; (J.R.Y.); (Y.K.C.)
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
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Lee L, Nam OH, Lee KE, Lee C. Relationship between insomnia and working from home among Korean domestic workers: results from the 5th Korean working condition survey. BMC Public Health 2023; 23:1367. [PMID: 37460978 DOI: 10.1186/s12889-023-16268-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 07/08/2023] [Indexed: 07/20/2023] Open
Abstract
BACKGROUND Social distancing has been increasingly implemented following the COVID-19 pandemic and more people have been working from home. Consequently, the screen time has increased, which can disrupt the natural sleep-wake cycle and delay sleep onset. Given that studies on the health of employees who work from home remain insufficient, particularly with respect to the risk of sleep disorders including insomnia, this study aimed to assess the relationship between working from home and insomnia among workers using data from the 5th Working Conditions Survey conducted in Korea. METHODS Of 30,108 wage workers, we enrolled 818 employees who worked from home and 4,090 employees who worked from the office, a 1:5 pair sample based on sex and occupational group. Personal and occupational characteristics, working from home, and insomnia were included in the analysis. Age, education, employment status, working years, working hours per week, work-life balance, self-perceived health, depression, and anxiety were all adjusted as potential confounding variables. Conditional logistic regression analysis was performed using working from home as an independent variable and insomnia as a dependent variable to determine the correlation between working from home and insomnia. RESULTS Working from home was associated with sleep onset latency disorder, OR = 3.23 (95% CI: 2.67-3.91), sleep maintenance disorder, OR = 3.67 (95% CI: 3.02-4.45), and non-restorative sleep, OR = 3.01 (95% CI: 2.46-3.67); working from home had a statistically significant relationship with all three types of insomnia. CONCLUSIONS Within the limits of the study, these findings can be used as a fundamental basis for the implementation of policies and guidelines to prevent insomnia in workers who work from home.
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Affiliation(s)
- Lei Lee
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, 03722, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, 02447, Korea
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, 02447, Korea
| | - Ko Eun Lee
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, Seoul, 02447, Korea
| | - Chunui Lee
- Department of Oral and Maxillofacial Surgery, Wonju College of Medicine, Yonsei University, Wonju, 26426, Korea.
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10
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Jung YS, Ro ST, Kang SW, Lee H, Lee JS, Chae YK, Lee KE, Lee HS, Kwack KH, Kim SK, Choi SC, Nam OH. Bisphenol A release from commercially available 3-dimensionally printed resins and human cell apoptosis to bisphenol A: an in-vitro study. J Clin Pediatr Dent 2023; 47:89-95. [PMID: 37143426 DOI: 10.22514/jocpd.2023.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 02/13/2023] [Indexed: 05/06/2023] Open
Abstract
Bisphenol A (BPA) from dental materials may be linked to children's health issues. This study aimed to assess the release of BPA from commercially available 3-dimensional (3D)-printed resin materials and evaluate BPA-related apoptotic effects on human periodontal ligament cells and gingival fibroblasts. Commercially available 3D-printed resin materials for prosthodontic use were selected as follows: NextDent C&B MFH (3D Systems, Rock Hill, SC, USA), DIOnavi-P. MAX (Dio Co., Busan, Korea), and DIOnavi-Denture02 (Dio Co., Busan, Korea). Identical cuboidal samples (1 cm × 1 cm × 0.5 cm) were printed from the materials and cured. BPA release was assessed using liquid chromatography/mass spectrometry (LC/MS). In addition, human gingival fibroblasts and periodontal ligament cells were exposed to various BPA solutions based on the LC/MS results. Cell Counting kit-8 (CCK-8) and real-time polymerase chain reaction analyses were performed to evaluate BPA-related apoptotic effects. The LC/MS analysis confirmed that none of the 3D-printed resin materials released BPA after curing. Both human gingival fibroblasts and periodontal ligament cells showed lower viability after BPA exposure. Regarding apoptosis-related gene expression, Caspase10 (CASP10) expression in periodontal ligament cells was significantly different in the BPA solutions (p < 0.05). The expression of BAX and Capspase8 (CASP8) in gingival fibroblasts was significantly increased by BPA in a dose-dependent manner (p < 0.05). Within the limitations of this study, the 3D-printed resin materials were not found to release BPA. This finding implies that 3D-printed resin materials are not associated with potential BPA-related risks in children.
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Affiliation(s)
- Yun Sun Jung
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Dentistry, Graduate School, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Sang Tae Ro
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Dentistry, Graduate School, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Hyeonjong Lee
- Department of Prosthodontics, Dental College, Yonsei University, 03722 Seoul, Republic of Korea
| | - Jang Sun Lee
- Dio Implant Ortho Research & Design Center, 48058 Busan, Republic of Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Dentistry, Graduate School, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Ko Eun Lee
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Kyu Hwan Kwack
- Department of Oral Microbiology, College of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Su Kang Kim
- Department of Biomedical Laboratory Science, Catholic Kwandong University, 25601 Gangneung, Republic of Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University, College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, 02447 Seoul, Republic of Korea
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11
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Seo H, Hwang J, Jung YH, Lee E, Nam OH, Shin J. Deep focus approach for accurate bone age estimation from lateral cephalogram. J Dent Sci 2023; 18:34-43. [PMID: 36643224 PMCID: PMC9831852 DOI: 10.1016/j.jds.2022.07.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 07/22/2022] [Accepted: 07/22/2022] [Indexed: 01/18/2023] Open
Abstract
Background/purpose Bone age is a useful indicator of children's growth and development. Recently, the rapid development of deep-learning technique has shown promising results in estimating bone age. This study aimed to devise a deep-learning approach for accurate bone-age estimation by focusing on the cervical vertebrae on lateral cephalograms of growing children using image segmentation. Materials and methods We included 900 participants, aged 4-18 years, who underwent lateral cephalogram and hand-wrist radiograph on the same day. First, cervical vertebrae segmentation was performed from the lateral cephalogram using DeepLabv3+ architecture. Second, after extracting the region of interest from the segmented image for preprocessing, bone age was estimated through transfer learning using a regression model based on Inception-ResNet-v2 architecture. The dataset was divided into train:test sets in a ratio of 4:1; five-fold cross-validation was performed at each step. Results The segmentation model possessed average accuracy, intersection over union, and mean boundary F1 scores of 0.956, 0.913, and 0.895, respectively, for the segmentation of cervical vertebrae from lateral cephalogram. The regression model for estimating bone age from segmented cervical vertebrae images yielded average mean absolute error and root mean squared error values of 0.300 and 0.390 years, respectively. The coefficient of determination of the proposed method for the actual and estimated bone age was 0.983. Our method visualized important regions on cervical vertebral images to make a prediction using the gradient-weighted regression activation map technique. Conclusion Results showed that our proposed method can estimate bone age by lateral cephalogram with sufficiently high accuracy.
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Affiliation(s)
- Hyejun Seo
- Department of Pediatric Dentistry, School of Dentistry, Pusan National University, Yangsan, South Korea,Department of Dentistry, Ulsan University Hospital, Ulsan, South Korea
| | - JaeJoon Hwang
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Yangsan, South Korea,Dental and Life Science Institute & Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, South Korea
| | - Yun-Hoa Jung
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Yangsan, South Korea,Dental and Life Science Institute & Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, South Korea
| | - Eungyung Lee
- Department of Pediatric Dentistry, School of Dentistry, Pusan National University, Yangsan, South Korea,Dental and Life Science Institute & Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, South Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea,Corresponding author. Department of Pediatric Dentistry, Kyung Hee University School of Dentistry, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, South Korea.
| | - Jonghyun Shin
- Department of Pediatric Dentistry, School of Dentistry, Pusan National University, Yangsan, South Korea,Dental and Life Science Institute & Dental Research Institute, School of Dentistry, Pusan National University, Yangsan, South Korea,Corresponding author. Department of Pediatric Dentistry, School of Dentistry, Pusan National University, Geumo-ro 20, Mulgeum-eup, Yangsan-si, 50612, South Korea.
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12
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Jang DH, Chae YK, Lee KE, Nam OH, Lee HS, Choi SC, Kim MS. Determination of the range of intervention timing for supernumerary teeth using the Korean health insurance review and assessment service database. J Clin Pediatr Dent 2023; 47:67-73. [PMID: 36627222 DOI: 10.22514/jocpd.2022.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Accepted: 11/24/2022] [Indexed: 12/23/2022] Open
Abstract
This study aimed to identify the frequency of complications during the diagnosis, observation, and treatment of supernumerary teeth or odontomas and evaluate the relationship between complications and the timing of surgical intervention. This study was conducted based on data from the Korea Health Insurance Review and Assessment Service between January 2008 and December 2019. A 2-year washout period was applied, and a follow-up period of at least 2 years was also included. During the observation period, the age at diagnosis of supernumerary teeth and odontomas was analyzed using major diagnostic codes, and the treatment codes were used to determine the interval between diagnosis and surgical intervention. The incidence rates of supernumerary teeth (1.21%) and odontomas (0.36%) were comparable to that reported in previous studies. The frequency of supernumerary teeth was the highest in the anterior region, followed by the premolar and molar regions. The average ages at diagnosis according to the location of the supernumerary teeth were 7.25, 13.98, and 16.11 years in the anterior, premolar, and molar regions, respectively. The age at diagnosis correlated with the maturity period of the teeth at the corresponding location. For the supernumerary tooth group, surgical intervention was more likely to occur when malocclusion (p < 0.0001) or tooth eruption disturbances (p < 0.0001) were present or dentigerous cysts were absent (p = 0.006). For the odontoma group, malocclusion (p = 0.251) was not correlated with surgical intervention. When tooth eruption disturbances (p = 0.002) and dentigerous cysts (p < 0.0001) were present, surgical intervention was more likely to occur. Pediatric dentists should conduct timely clinical checks and periodic follow-ups to prevent complications and unnecessary orthodontic treatments in patients with supernumerary teeth or odontomas.
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Affiliation(s)
- Da Hyeo Jang
- Department of Pediatric Dentistry, , Kyung Hee University Hospital at Gangdong, 05278 Seoul, Republic of Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
| | - Ko Eun Lee
- Department of Pediatric Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Medical Center, 02447 Seoul, Republic of Korea
| | - Mi Sun Kim
- Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee University Hospital at Gangdong, 05278 Seoul, Republic of Korea
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13
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Chung SY, Lee H, Chae YK, Jung YS, Jo SS, Lee KE, Choi SC, Nam OH. Stress distribution in pediatric zirconia crowns depending on different tooth preparation and cement type: a finite element analysis. BMC Oral Health 2022; 22:550. [PMID: 36456927 PMCID: PMC9714224 DOI: 10.1186/s12903-022-02596-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 11/15/2022] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND In clinical settings, tooth preparation for prefabricated zirconia crowns (PZCs) in the primary dentition varies widely. However, knowledge about the biomechanical behavior of PZCs in various clinical settings is limited. This study was conducted to evaluate the biomechanical behavior of PZCs in different clinical settings using 3-dimensional finite element analysis. METHODS 3-dimensional models of the PZC, cement, and tooth with six different conditions were simulated in primary molar teeth, incorporating cement thickness (100, 500, and 1000 μm) and cement type (resin-modified glass ionomer cement and resin cement). A total of 200 N of occlusal force was applied to the models, both vertically and obliquely as representative cases. A general linear model univariate analysis with partial eta-squared (ηp2) was performed to evaluate the relative effects of the variables. RESULTS The overall stress of tooth was increased as the cement space increases under oblique loading. The von Mises stress values of the resin cements were significantly higher than those of the resin-modified glass ionomer cements for all cement thicknesses (p < .05). The effect size of the cement type (ηp2 = .519) was more dominant than the cement thickness (ηp2 = .132) in the cement layer. CONCLUSIONS Within the limits of this study, cement type has a greater influence on the biomechanical behavior of PZCs than cement thickness.
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Affiliation(s)
- Sang-Yeop Chung
- grid.263333.40000 0001 0727 6358Department of Civil and Environmental Engineering, Sejong University, Seoul, Korea
| | - Hyeonjong Lee
- grid.15444.300000 0004 0470 5454Department of Prosthodontics, Dental College, Yonsei University, Seoul, Korea
| | - Yong Kwon Chae
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Yun Sun Jung
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Su-Sung Jo
- grid.263333.40000 0001 0727 6358Department of Civil and Environmental Engineering, Sejong University, Seoul, Korea
| | - Ko Eun Lee
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Sung Chul Choi
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
| | - Ok Hyung Nam
- grid.289247.20000 0001 2171 7818Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447 Korea ,grid.411231.40000 0001 0357 1464Present Address: Department of Pediatric Dentistry, Kyung Hee University College of Dentistry, Kyung Hee Universtiy Medical Center, Seoul, Korea
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Jeong MJ, Lee KE, Chae YK, Nam OH, Lee HS, Choi SC. Correlations between skeletal maturity and dental calcification stages in Korean children. Eur J Paediatr Dent 2022; 23:101-105. [PMID: 35722843 DOI: 10.23804/ejpd.2022.23.02.03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
AIM To evaluate the relationship between dental calcification and skeletal maturity and to identify the tooth with the highest correlation with skeletal maturity index in Korean children. MATERIALS For 447 children (205 boys and 242 girls) aged between 5 and 13 years, hand-wrist and lateral cephalometric radiographs were taken to assess skeletal maturity by Fishman's skeletal maturity indicators (SMI) and Baccetti's cervical vertebrae maturation (CVM) stages. Dental panoramic radiographs were taken to assess dental maturity of the permanent mandibular canine, first and second premolar, and second molar using the method devised by Dermirjian. CONCLUSION Dental calcification stages determined by panoramic radiographs can be clinically used as useful indices to predict skeletal maturity in Korean children.
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Affiliation(s)
- M J Jeong
- Department of Pediatric Dentistry, Graduate School, Kyung Hee University, Seoul, Republic of Korea
| | - K E Lee
- Department of Pediatric Dentistry, Kyung Hee University Dental Hospital, Seoul, Republic of Korea
| | - Y K Chae
- Department of Pediatric Dentistry, Graduate School, Kyung Hee University, Seoul, Republic of Korea
| | - O H Nam
- Department of Pediatric Dentistry, Kyung Hee University Dental Hospital, Seoul, Republic of Korea
| | - H S Lee
- Department of Pediatric Dentistry, Kyung Hee University Dental Hospital, Seoul, Republic of Korea
| | - S C Choi
- Department of Pediatric Dentistry, Kyung Hee University Dental Hospital, Seoul, Republic of Korea
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15
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Chae YK, Lee H, Hyun HK, Lee HS, Choi SC, Nam OH. Three-dimensional evaluation of tooth preparation forms in paediatric zirconia crowns: An in vitro study. Int J Paediatr Dent 2022; 32:392-400. [PMID: 34608702 DOI: 10.1111/ipd.12918] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 08/13/2021] [Accepted: 09/21/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Though prefabricated zirconia crowns (PZCs) differ from stainless steel crowns and have different preparation guidelines for optimal crown adaptation, little is known about how clinicians prepare teeth for PZCs. AIM To investigate the prepared tooth forms for PZCs and identify the shared patterns of tooth preparation. DESIGN Twenty participants prepared primary maxillary first molars and mandibular second molars for PZCs. A model with ideally prepared tooth was digitally generated as a reference. The prepared teeth were digitally scanned and superimposed on the reference. Three-dimensional analysis software was used to evaluate the discrepancy between ideal and prepared surface for overall surface and subdivided area. RESULTS Half of the surfaces received excessive reduction, and 24% showed error within 0.2 mm (p < .001) in maxilla. 41.6% of surfaces showed error within 0.2 mm, and 20% were excessively prepared (p = .002) in mandible. The highest discrepancies were found at the mesiopalatal line angles (maxillary) and at the distobuccal line angles (mandibular). Significant discrepancies were observed on the occlusal surfaces, especially at the cusps. CONCLUSIONS Tooth preparations for PZCs showed wide variations related to depth among the participants.
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Affiliation(s)
- Yong Kwon Chae
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Korea.,Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Hyeonjong Lee
- Department of Prosthodontics, Dental College, Yonsei University, Seoul, Korea
| | - Hong-Keun Hyun
- Department of Pediatric Dentistry, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
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16
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Lee JH, Lee KE, Nam OH, Chae YK, Lee MH, Kweon DK, Kim MS, Lee HS, Choi SC. Orodispersible hyaluronic acid film delivery for oral wound healing in rats. J Dent Sci 2022; 17:1595-1603. [PMID: 36299335 PMCID: PMC9588893 DOI: 10.1016/j.jds.2022.04.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Revised: 04/07/2022] [Indexed: 11/30/2022] Open
Abstract
Background/purpose Oral wound healing undergoes a dynamic process of oral environment. This study aimed to investigate the effects of hyaluronic acid (HA) film on oral wound healing in a rat model. Materials and methods A total of 60 rats with tongue wounds (5 mm in diameter) were randomly divided into control (n = 20), HA gel (n = 20), and HA film groups (n = 20). The animals were sacrificed on either 3 or 7 days after the experiment. Clinical, histological, and quantitative reverse transcriptase-polymerase chain reaction analysis were performed to evaluate the healing rate, inflammation, re-epithelialization, and gene expression of wound healing biomarkers. Results The healing rates of HA gel (84.4 ± 9.2%) and HA film (74.0 ± 15.0%) were significantly higher than that of the control (51.7 ± 16.9%) on day 7 (P < 0.001 and P = 0.002, respectively). Histological analysis revealed no significant differences between the groups on day 3. On day 7, only the HA film showed significant improvement in inflammation (P = 0.038) and re-epithelialization (P = 0.011) compared to the control. Regarding wound healing biomarkers, both HA gel and HA film groups showed lower level of COL1α1 expression on day 3 compared to the control. Conclusion Within the limits of this study, HA film was found to be effective for oral wound healing, particularly for re-epithelialization. This finding suggests that HA film delivery can be beneficial not only for clinical convenience but also for promoting oral wound healing.
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Affiliation(s)
- Jeong Hyun Lee
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Ko Eun Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
- Corresponding author. Department of Pediatric Dentistry, Kyung Hee University School of Dentistry, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, South Korea.
| | - Yong Kwon Chae
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | | | | | - Mi Sun Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
- Department of Pediatric Dentistry, Kyung Hee University Dental Hospital at Gangdong, Seoul, South Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
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Chung SY, Kim YH, Chae YK, Jo SS, Choi SC, Nam OH. Void characteristics and tortuosity of calcium silicate-based cements for regenerative endodontics: a micro-computed tomography analysis. BMC Oral Health 2021; 21:565. [PMID: 34749714 PMCID: PMC8573873 DOI: 10.1186/s12903-021-01940-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Accepted: 10/30/2021] [Indexed: 11/17/2022] Open
Abstract
Background Internal voids of materials can serve a hub for microorganism and affect the sealing ability. This study aimed to evaluate the sealing performance of calcium silicate-based cements in immature teeth treated with regenerative endodontics. Methods Twenty single root canals from immature permanent premolars were prepared using regenerative endodontic protocols. The root canals were randomly divided into two groups and sealed with mineral trioxide aggregate (MTA) and Biodentine (BD). The teeth were kept in humid environment for 7 days and scanned using micro-computed tomography. The voids within the cements were segmented and visualized using image processing, incorporating the modified Otsu algorithm. The porosity of each sample was also calculated as the ratio between the number of voxels of voids and the volume of the cements. Tortuosity was also calculated using the A-star algorithm. Results Voids larger than 70 μm were predominantly observed in the top and interfacial surface of cements. The others were evenly distributed. MTA and BD showed the same level of porosity and tortuosity at interfacial surfaces. In inner surfaces, MTA showed more less porosity and tortuosity compared to BD (p < 0.05). Conclusions There were no differences in sealing performance between MTA and BD.
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Affiliation(s)
- Sang-Yeop Chung
- Department of Civil and Environmental Engineering, Sejong University, Seoul, Republic of Korea
| | - Yun Hyeong Kim
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Republic of Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447, Republic of Korea
| | - Su-Sung Jo
- Department of Civil and Environmental Engineering, Sejong University, Seoul, Republic of Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447, Republic of Korea.
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Herr L, Jih MK, Shin J, Chae YK, Lee HS, Choi SC, Nam OH. The perspective of undergraduate dental students on web-based learning in pediatric dentistry during the COVID-19 pandemic: a Korean multicenter cross-sectional survey. BMC Med Educ 2021; 21:505. [PMID: 34563185 PMCID: PMC8464139 DOI: 10.1186/s12909-021-02928-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND The COVID-19 pandemic changed the world and created a shift in the dental education program. This sudden change in the dental education program may have affected the academic standards of dental students. This study aimed to evaluate the overall satisfaction and effectiveness of online learning in pediatric dentistry of undergraduate dental students' during the COVID-19 pandemic in South Korea. METHODS An anonymous online survey was sent to three dental schools, and responses were collected from dental school students. Questions included the demographics, perspectives of online classes, comparison of online and offline pediatric dentistry classes and opinions on how dental schools are handling the pandemic. Students' perspectives on online classes were evaluated based on satisfaction with online education. Data were analyzed using the Kruskal-Wallis test and the Mann-Whitney U test. RESULTS Most students took online classes from home (80.9%) using Zoom (50.4%). The majority reported overall program satisfaction (74.1%) and agreed that universities implemented online classes well (55%). Students who were in favor of online classes responded more positively to questions on the effectiveness and safety of online learning (p < 0.05). Regardless of satisfaction with online education, the students agreed that the online education shift was the right decision in pandemic outbreak. CONCLUSIONS Dental students in South Korea preferred and adapted well to the web-based learning program in pediatric dentistry during COVID-19 pandemic.
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Affiliation(s)
- Lan Herr
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - Myeong Kwan Jih
- Department of Pediatric Dentistry, School of Dentistry, Chosun University, Gwangju, South Korea
| | - Jonghyun Shin
- Department of Pediatric Dentistry, School of Dentistry, Dental and Life Science Institute, Pusan National University, Yangsan, South Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447, South Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447, South Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447, South Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Kyungheedae-Ro 26, Dongdaemoon-Gu, Seoul, 02447, South Korea.
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Hong SJ, Chae YK, Lee C, Choi SC, Nam OH. A Digital Fabrication of Dental Prosthesis for Preventing Self-Injurious Behavior Related to Autism Spectrum Disorder: A Case Report. Int J Environ Res Public Health 2021; 18:ijerph18179249. [PMID: 34501850 PMCID: PMC8430482 DOI: 10.3390/ijerph18179249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 08/23/2021] [Accepted: 08/30/2021] [Indexed: 12/02/2022]
Abstract
This case report aimed to demonstrate the prosthetic solution of an autism patient with self-injurious behavior using digital dentistry. A 24-year-old male visited our clinic with chief complaints of severe gingival recession associated with self-injurious behavior. Bilateral fixed prosthesis with denture flange were delivered using a digital workflow for the protection of the gingiva. The patient showed healed gingival tissue, behavioral modification, and acceptable oral hygiene during the follow-up period. Also, his caregivers reported no recurrence of the self-injurious behavior. Autism patients usually show self-injurious behavior, which can damage their oral tissue. With adoption of this prosthesis, behavior modification as well as healing of oral tissue was achieved.
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Affiliation(s)
- Seoung-Jin Hong
- Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul 02447, Korea;
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea; (Y.K.C.); (S.C.C.)
| | - Chunui Lee
- Department of Oral and Maxillofacial Surgery, Wonju College of Medicine, Yonsei University, Wonju 26426, Korea;
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea; (Y.K.C.); (S.C.C.)
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea; (Y.K.C.); (S.C.C.)
- Correspondence: ; Tel.: +82-2-958-9372; Fax: +82-2-965-7247
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Chae YK, Shin SY, Kang SW, Choi SC, Nam OH. Differential gene expression profiles of periodontal soft tissue from rat teeth after immediate and delayed replantation: a pilot study. J Periodontal Implant Sci 2021; 52:127-140. [PMID: 35505574 PMCID: PMC9064781 DOI: 10.5051/jpis.2104300215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 09/27/2021] [Accepted: 11/03/2021] [Indexed: 11/18/2022] Open
Abstract
Purpose In dental avulsion, delayed replantation usually has an uncertain prognosis. After tooth replantation, complex inflammatory responses promote a return to periodontal tissue homeostasis. Various types of cytokines are produced in the inflammatory microenvironment, and these cytokines determine the periodontal tissue response. This study aimed to identify the gene expression profiles of replanted teeth and evaluate the functional differences between immediate and delayed replantation. Methods Maxillary molars from Sprague-Dawley rats were extracted, exposed to a dry environment, and then replanted. The animals were divided into 2 groups according to the extra-oral time: immediate replantation (dry for 5 minutes) and delayed replantation (dry for 60 minutes). Either 3 or 7 days after replantation, the animals were sacrificed. Periodontal soft tissues were harvested for mRNA sequencing. Hallmark gene set enrichment analysis was performed to predict the function of gene-gene interactions. The normalized enrichment score (NES) was calculated to determine functional differences. Results The hallmark gene sets enriched in delayed replantation at 3 days were oxidative phosphorylation (NES=2.82, Q<0.001) and tumor necrosis factor-alpha (TNF-α) signaling via the nuclear factor kappa light chain enhancer of activated B cells (NF-κB) pathway (NES=1.52, Q=0.034). At 7 days after delayed replantation, TNF-α signaling via the NF-κB pathway (NES=–1.82, Q=0.002), angiogenesis (NES=–1.66, Q=0.01), and the transforming growth factor-beta signaling pathway (NES=–1.46, Q=0.051) were negatively highlighted. Conclusions Differentially expressed gene profiles were significantly different between immediate and delayed replantation. TNF-α signaling via the NF-κB pathway was marked during the healing process. However, the enrichment score of this pathway changed in a time-dependent manner between immediate and delayed replantation.
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Affiliation(s)
- Yong Kwon Chae
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Korea
| | - Seo Young Shin
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
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Chae YK, Lee H, Jih MK, Lee HS, Lee JW, Kim SH, Kim GT, Choi SC, Nam OH. Validation of a three-dimensional printed model for training of surgical extraction of supernumerary teeth. Eur J Dent Educ 2020; 24:637-643. [PMID: 32402151 DOI: 10.1111/eje.12543] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/21/2020] [Accepted: 05/05/2020] [Indexed: 06/11/2023]
Abstract
INTRODUCTION This study aimed to validate a three-dimensional (3D) printed model to provide training for supernumerary teeth (SNTs) extraction. MATERIALS AND METHODS Each of the 30 participants, grouped as experienced and without experience, conducted two identically simulated surgeries on a 3D-printed replica of human mixed dentition with a SNT. The surgery time, area of bony window and volume of removed material were measured; subsequently, responses to a five-item questionnaire were recorded. The collected data were statistically analysed. RESULTS The surgery time was 228.37 ± 141.53 seconds and 125.47 ± 53.03 seconds in the first and second surgery, respectively. The training significantly decreased the surgery time in the participants without experience (P = .000). However, there were no significant differences in the area of window opening (P = .271) and volume of removed material between the two surgeries (P = .075). The participants who perceived educational benefits accounted for more than 60% of the respondents for every question. Participants without experience in SNT extraction showed a tendency to rate a higher score than did those with experience. CONCLUSIONS A 3D-printed model for surgical extraction of a SNT can improve surgical skill and, especially, shorten the learning curve in beginners.
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Affiliation(s)
- Yong Kwon Chae
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Hyeonjong Lee
- Department of Prosthodontics, Dental Research Institute, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, Korea
| | - Myeong Kwan Jih
- Department of Pediatric Dentistry, School of Dentistry, Chosun University, Gwangju, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Jung-Woo Lee
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Su-Hwan Kim
- Department of Dentistry, College of Medicine, University of Ulsan, Seoul, Korea
| | - Gyu-Tae Kim
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
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Nam OH, Lee HS, Kim JH, Chae YK, Hong SJ, Kang SW, Lee HS, Choi SC, Kim Y. Differential Gene Expression Changes in Human Primary Dental Pulp Cells Treated with Biodentine and TheraCal LC Compared to MTA. Biomedicines 2020; 8:biomedicines8110445. [PMID: 33105546 PMCID: PMC7690278 DOI: 10.3390/biomedicines8110445] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 10/16/2020] [Accepted: 10/20/2020] [Indexed: 12/14/2022] Open
Abstract
This study aimed to analyze the effects of pulp capping materials on gene expression changes in primary tooth-derived dental pulp cells using next-generation sequencing. Dental pulp cells were extracted and treated with mineral trioxide aggregate (MTA), Biodentine (BD), or TheraCal LC (TC). Cell viability assays were performed. Total RNA was extracted and analyzed through mRNA sequencing. Bioinformatic analysis of differential gene expression in dental pulp cells exposed to BD or TC versus MTA was performed. MTA, BD, and TC exposure had no significant effect on pulp cell viability (p > 0.05). Gene sets associated with inflammatory response (p = 2.94 × 10−5) and tumor necrosis factor alpha (TNF-α) signaling via the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) pathway (p = 2.94 × 10−5) were enriched in all materials. In BD-treated cells, Wnt/β-catenin signaling (p = 3.15 × 10−4) gene sets were enriched, whereas enrichment of interferon gamma (IFN-γ) response (p = 3 × 10−3) was observed in TC-treated cells. In gene plot analysis, marked increases in receptor activator of nuclear factor kappa-Β ligand (RANKL) expression were seen in TC-treated cells over time. Despite the similar cell viabilities exhibited among MTA-, BD-, and TC-treated cells, patterns of gene networks differed, suggesting that diverse functional gene differences may be associated with treatment using these materials.
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Affiliation(s)
- Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Ho Sun Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Jae-Hwan Kim
- Department of Pediatric Dentistry, School of Dentistry, Jeonbuk National University, Jeonju 54896, Korea
| | - Yong Kwon Chae
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Seoung-Jin Hong
- Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Sang Wook Kang
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Korea
| | - Young Kim
- Department of Oral Pathology, School of Dentistry, Chonnam National University, Gwangju 61186, Korea
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Lee H, Choi S, Chae YK, Jung J, Choi SC, Nam OH. Customized surgical guide with a bite block and retraction arm for a deeply impacted odontoma; a technical note. J Stomatol Oral Maxillofac Surg 2020; 122:456-457. [PMID: 32416286 DOI: 10.1016/j.jormas.2020.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 04/30/2020] [Accepted: 05/01/2020] [Indexed: 10/24/2022]
Abstract
Odontomas can cause impaction of permanent teeth. During the removal of odontomas associated with an impacted tooth, minimally-invasive surgical approaches are necessary. We present a technical note highlighting easy extraction of a deeply impacted odontoma using a patient-specific computer-aided design/computer-aided manufacturing (CAD/CAM) surgical guide. Its use and advantages are described.
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Affiliation(s)
- H Lee
- Department of Prosthodontics, Dental Research Institute, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, Korea.
| | - S Choi
- Department of Biomedical Engineering, College of Medical Science, Ewha Womans University, Seoul, Korea.
| | - Y K Chae
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Hoegi-dong, Dongdaemoon-gu, 02447, Seoul, Republic of Korea.
| | - J Jung
- Department of Oral & Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul, Korea.
| | - S C Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Hoegi-dong, Dongdaemoon-gu, 02447, Seoul, Republic of Korea.
| | - O H Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Hoegi-dong, Dongdaemoon-gu, 02447, Seoul, Republic of Korea.
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Kim MA, Kim JH, Nam OH. Tea extracts differentially inhibit Streptococcus mutans and Streptococcus sobrinus biofilm colonization depending on the steeping temperature. Biofouling 2020; 36:256-265. [PMID: 32326756 DOI: 10.1080/08927014.2020.1755429] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 04/01/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
This study aimed to evaluate the effects of tea extracts on oral biofilm colonization depending on steeping temperature. S. mutans and S. sobrinus were cultured and treated with green or black tea extracts prepared under different steeping conditions. Biofilm formation, glucosyltransferase (GTF) levels, bacterial growth, and acidogenicity were evaluated. Biofilms were also assessed by gas chromatography-mass spectrometry and confocal laser scanning microscopy. All extracts with hot steeping showed higher inhibitory effects on biofilm formation and cell viability and lower GTF levels compared with those with cold steeping (p < 0.05). Hot steeping significantly reduced bacterial growth (p < 0.05) and maintained the pH. Catechins were only identified from hot steeping extracts. Within the limits of this study, extracts with cold steeping showed lower inhibitory effects on oral biofilms. The different effects between steeping extracts may be attributed to the difference in catechins released from tea extracts under the different steep conditions.
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Affiliation(s)
- Mi-Ah Kim
- Department of Conservative Dentistry, School of Dentistry and Institute of Oral Bioscience, Jeonbuk National University, Jeonju, Republic of Korea
| | - Jae-Hwan Kim
- Department of Pediatric Dentistry, School of Dentistry, Jeonbuk National University, Jeonju, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
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Oh TJ, Nam OH, Kim MS, Lee HS, Hwang YS, Choi SC. The Use of Histidine-tryptophan-ketoglutarate Solution as a New Storage Medium for the Avulsed Tooth. J Endod 2019; 46:74-80. [PMID: 31843129 DOI: 10.1016/j.joen.2019.10.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 08/22/2019] [Accepted: 10/13/2019] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Histidine-tryptophan-ketoglutarate (HTK) is a preservation solution used for organ transplantation. The physiological pH and osmolality of this solution are known to facilitate cell proliferation and cell membrane stabilization. The purpose of the present study was to investigate the efficacy of several concentrations of HTK solution as a storage medium for avulsed teeth. METHODS Cultured human periodontal ligament cells were stored in different concentrations of HTK solutions. After 1, 3, 6, 12, 24, 48, and 72 hours, cell viability was assessed using the Cell-Counting Kit-8 (Dojindo Molecular Technologies, Kumamoto, Japan) and LIVE/DEAD (Invitrogen, Carlsbad, CA) assay. Cell response of the most effective concentrations of HTK solution were further analyzed by gene expression profiling, and their cell viability was compared with other storage media. RESULTS The highest cell viability was observed in 50% HTK solution in various concentrations of HTK solution (P < .05). In periodontal ligament cells stored in 50% HTK solution for 3 hours, the expression of genes related to angiogenesis, the inflammatory response, and cell proliferation was increased compared with the control. Compared with other storage media, the highest cell viability was observed in 50% HTK solution. CONCLUSIONS Our study suggests that 50% HTK solution containing cell culture medium represents a suitable storage medium for avulsed teeth.
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Affiliation(s)
- Tae Jun Oh
- Department of Pediatric Dentistry, Graduate School, Kyung Hee University, Seoul, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Mi Sun Kim
- Department of Pediatric Dentistry, Kyung Hee University Dental Hospital at Gangdong, Seoul, Republic of Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Yu-Shik Hwang
- Department of Maxillofacial Biomedical Engineering and Institute of Oral Biology, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.
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Nam OH, Oh TJ, Lee JH, Hwang YS, Choi SC. Differential gene expression profiles of human periodontal ligament cells preserved in Hank's balanced salt solution and milk. Dent Traumatol 2019; 36:58-68. [PMID: 31050380 DOI: 10.1111/edt.12480] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 04/28/2019] [Accepted: 04/29/2019] [Indexed: 01/05/2023]
Abstract
BACKGROUND/AIM Various types of storage media have been investigated to preserve avulsed teeth. However, the efficacies of storage media mainly focus on the aspect of cell viability. The aim of this study was to evaluate and compare the gene expression profiles of human periodontal ligament cells preserved in Hank's balanced salt solution (HBSS) and milk over different storage durations. MATERIAL AND METHODS Human periodontal ligament cells were cultured and preserved in HBSS and milk for 3 and 6 hours. Next, total RNA was isolated. QuantSeq 3' mRNA-Sequencing was used to examine differences in gene expression in HBSS- and milk-grown periodontal ligament cells. Bioinformatics analysis was also performed to predict the function of the differentially expressed genes. RESULTS The number of differentially expressed genes shared among all groups was 101. In gene set enrichment analysis, the shared differentially expressed genes in HBSS and milk were associated with the TNF-α signaling pathway (P = 1.07E-7 ). Seven hallmark gene sets were also identified in HBSS. Moreover, hallmark gene sets associated with hypoxia (P = 7.26E-5 ) and apoptosis (P = 4.06E-4 ) were identified in HBSS. In milk, 10 hallmark gene sets along with gene sets for inflammatory response (P = 6.87E-3 ) were identified. CONCLUSIONS Compared to those in milk, genes in HBSS were differentially expressed with increasing storage duration, suggesting that diverse and different gene expression may be involved in HBSS and milk. However, a more detailed functional analysis of these differentially expressed genes in storage solutions should be performed in the future.
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Affiliation(s)
- Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Tae Jun Oh
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Jae-Hyung Lee
- Department of Maxillofacial Biomedical Engineering and Institute of Oral Biology, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Yu-Shik Hwang
- Department of Maxillofacial Biomedical Engineering and Institute of Oral Biology, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
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Nam OH, Cheon K, Kim MS, Lee HS, Choi SC. Evaluation of the periodontal and pulpal healing of replanted rat molars with doxycycline root conditioning. J Periodontal Implant Sci 2019; 49:148-157. [PMID: 31285939 PMCID: PMC6599750 DOI: 10.5051/jpis.2019.49.3.148] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Accepted: 05/16/2019] [Indexed: 11/08/2022] Open
Abstract
Purpose This study aimed to evaluate periodontal and pulpal healing in replanted rat teeth, preserved under different storage conditions, with or without root conditioning using doxycycline. Methods A total of 40 maxillary first molars extracted from 20 Sprague-Dawley rats were stored for different durations under different conditions (5 minutes in dry storage and 60 minutes in Hank's balanced salt solution [HBSS]) and subsequently replanted. The rats were divided into 2 groups based on the use of root surface treatment: the doxycycline group (root surface treated with doxycycline) and the control group (no doxycycline treatment). Eight weeks after replantation, the animals were sacrificed, and the teeth were evaluated using micro-computed tomography (micro-CT) and histomorphometric analysis. Results In the micro-CT analysis, the doxycycline group showed the same rate of occurrence of periapical radiolucency as was observed in the control group, but a lower degree of root resorption in teeth replanted after 60 minutes of storage in HBSS (P<0.05). In the histomorphometric analysis, the doxycycline group exhibited no improvement in either pulpal or periodontal healing of the replanted tooth after 5 minutes of dry storage, but showed a lower grade of surface root resorption (1.37±0.77) and inflammatory resorption in the teeth stored for 60 minutes in HBSS (1.33±0.71). Conclusions In conclusion, doxycycline improved the periodontal healing of replanted teeth stored for 60 minutes in HBSS, whereas doxycycline did not improve periodontal healing of replanted tooth after 5 minutes of dry storage. Within the limits of this study, doxycycline showed more favorable periodontal healing despite delayed replantation.
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Affiliation(s)
- Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University School of Dentistry, Seoul, Korea
| | - Kyounga Cheon
- Department of Pediatric Dentistry, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Mi Sun Kim
- Department of Pediatric Dentistry, Kyung Hee University Dental Hospital at Gangdong, Seoul, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, Kyung Hee University School of Dentistry, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University School of Dentistry, Seoul, Korea
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Chae YK, Nam OH, Kim MS, Lee HS, Kwon YD, Choi SC. An easy way to secure catheter in position during marsupialization procedure. J Stomatol Oral Maxillofac Surg 2018; 120:244-249. [PMID: 30562622 DOI: 10.1016/j.jormas.2018.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 11/19/2018] [Accepted: 12/09/2018] [Indexed: 10/27/2022]
Abstract
Marsupialization is the conservative treatment for cystic lesion in children. This technique requires maintaining the patency between the cyst and oral cavity to allow spontaneous healing of cystic lesion. There have been various fixation methods for securing the patency. However, the previous fixation methods have limitation of being invasive and inability to retain catheter firmly during the treatment. In this technical note, we adopted a novel and easy fixation method to obtain firm stability of catheter without damage to intraoral tissues during marsupialization technique.
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Affiliation(s)
- Y K Chae
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, South Korea
| | - O H Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - M S Kim
- Department of Pediatric Dentistry, Kyung Hee University Dental Hospital at Gangdong, Kyung Hee University, Seoul, South Korea.
| | - H-S Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea.
| | - Y-D Kwon
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul, South Korea.
| | - S C Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea.
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Moon CY, Nam OH, Kim M, Lee HS, Kaushik SN, Cruz Walma DA, Jun HW, Cheon K, Choi SC. Effects of the nitric oxide releasing biomimetic nanomatrix gel on pulp-dentin regeneration: Pilot study. PLoS One 2018; 13:e0205534. [PMID: 30308037 PMCID: PMC6181396 DOI: 10.1371/journal.pone.0205534] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 09/26/2018] [Indexed: 12/26/2022] Open
Abstract
Successful disinfection alongside complete endodontic tissue regeneration and revascularization are the most desired clinical outcomes of regenerative endodontics. Despite reported clinical successes, significant limitations to the current regenerative endodontic procedure (REP) have been elucidated. To improve the current REP, an antibiotics and nitric oxide (NO) releasing biomimetic nanomatrix gel was developed. The study evaluates antibacterial effects of an antibiotics and NO releasing biomimetic nanomatrix gel on multispecies endodontic bacteria. Antibiotics, ciprofloxacin (CF) and metronidazole (MN) were mixed and encapsulated within the NO releasing biomimetic nanomatrix gel. The gel was synthesized and self-assembled from peptide amphiphiles containing various functional groups. Antibacterial effects of the antibiotics and NO releasing biomimetic nanomatrix gel were evaluated using bacterial viability assays involving endodontic microorganisms including clinical samples. Pulp-dentin regeneration was evaluated via animal-model experiments. The antibiotics and NO releasing biomimetic nanomatrix gel demonstrated a concentration dependent antibacterial effect. In addition, NO alone demonstrated a concentration dependent antibacterial effect on endodontic microorganism. An in vivo analysis demonstrated the antibiotics and NO releasing biomimetic nanomatrix gel promoted tooth revascularization with maturation of root canals. An optimal concentration of and NO releasing nanomatrix gel is suggested for its potential as a root treatment material for REP and an appropriate protocol for human trials. Further investigation is required to obtain a larger sample size and decide upon ideal growth factor incorporation.
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Affiliation(s)
- Chan-Yang Moon
- Department of Pediatric Dentistry, Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University, Seoul, Korea
| | - Misun Kim
- Department of Pediatric Dentistry, Kyung Hee University, Seoul, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, Kyung Hee University, Seoul, Korea
| | - Sagar N. Kaushik
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - David A. Cruz Walma
- Department of Pediatric Dentistry, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Ho-Wook Jun
- Department of Biomedical Engineering, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Kyounga Cheon
- Department of Pediatric Dentistry, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
- * E-mail: (SCC); (KC)
| | - Sung Chul Choi
- Department of Pediatric Dentistry, Kyung Hee University, Seoul, Korea
- * E-mail: (SCC); (KC)
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Han JH, Jung J, Hwang L, Ko IG, Nam OH, Kim MS, Lee JW, Choi BJ, Lee DW. Anti-inflammatory effect of polydeoxyribonucleotide on zoledronic acid-pretreated and lipopolysaccharide-stimulated RAW 264.7 cells. Exp Ther Med 2018; 16:400-405. [PMID: 29896266 DOI: 10.3892/etm.2018.6186] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 03/29/2018] [Indexed: 12/24/2022] Open
Abstract
Bisphosphonates are generally used as therapeutic agents for bone diseases. However, previous reports on bisphosphonates-related osteonecrosis of the jaw (BRONJ) demonstrated that inflammation triggers and worsens the disease. Recently, polydeoxynucleotide (PDRN), an A2A receptor agonist, has been suggested for the treatment of various diseases and broadly studied for its anti-inflammatory effect. The present study aimed to measure the effect of PDRN on macrophage cells treated with zoledronic acid (ZA) and lipopolysaccharide (LPS). Macrophage cells were cultured with ZA for 24 h, following which they were stimulated with LPS in the presence or absence of varying concentrations of PDRN for 24 h. The cell viability and nitric oxide (NO) production of the cells were analyzed. In addition, protein expression levels were quantified by western blotting. Cell viability was compromised and NO was overexpressed by ZA and LPS stimulation. However, under ZA and LPS stimulation cell viability was enhanced, and NO production, and inducible nitric oxide synthase, interleukin (IL)-1β, -6, and tumor necrosis factor-α overexpression were suppressed on exposure to PDRN. A2A receptor and vascular endothelial growth factor (VEGF) expression levels increased following PDRN treatment. These results indicate that PDRN treatment of macrophages inhibits the inflammatory cytokines induced by ZA and LPS stimulation. It was hypothesized that the inflammatory cytokines were inhibited through A2A activation by PDRN. In addition, increased VEGF expression may contribute to increased vascularization and subsequently improve the pathological condition in BRONJ. As inflammation and LPS may stimulate the occurrence of BRONJ, the present study postulated that PDRN is possibly a candidate for the therapeutic management of BRONJ by decreasing inflammation and increasing vascularization.
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Affiliation(s)
- Jin-Hee Han
- Department of Anesthesiology and Pain Medicine, College of Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Junho Jung
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Lakkyong Hwang
- Department of Physiology, College of Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Il-Gyu Ko
- Department of Physiology, College of Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Mi Sun Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Jung-Woo Lee
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Byung-Joon Choi
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Deok-Won Lee
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyung Hee University, Seoul 02447, Republic of Korea
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Oh TJ, Nam OH, Kim MS, Choi SC, Lee HS. Oral Health of Patients with Special Health Care Needs After General Anesthesia: A 25- Year Retrospective Study. Pediatr Dent 2018; 40:215-219. [PMID: 29793569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
PURPOSE The purpose of this study was to compare the oral health state and dental treatment outcomes of patients with special health care needs (SHCN) after general anesthesia (GA), according to their compliance with dental checkups. METHODS The medical records of SHCN patients who were treated under GA in a dental hospital from 1991 to 2016 were analyzed. The 157 patients in this study were divided into regular (<small>N</small> equals 62) and irregular (n equals 95) dental checkups. RESULTS The mean age was 16.4 years (range equals two to 52); 96 were male, and 61 were female. In the irregular checkup group, invasive treatments like pulp treatment and extraction were performed more frequently during the checkup period (P<0.05). More patients underwent repeated GA in the irregular group (n equals 35; 36.8 percent) compared to the regular group (n equals six; 9.7 percent; P<0.05). CONCLUSIONS In our study, special health care needs patients in the irregular checkup group were approximately four times more likely to undergo repeated general anesthesia than those in the regular group. A regular checkup could reduce repeated GA and severity of dental treatment. Therefore, regular checkups must be included in the treatment plan of SHCN patients.
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Affiliation(s)
- Tae Jun Oh
- PhD student, Department of Pediatric Dentistry, Graduate School, at Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Clinical assistant professor, at Kyung Hee University, Seoul, Korea
| | - Mi Sun Kim
- Clinical assistant professor, at Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Chair and professor, at Kyung Hee University, Seoul, Korea
| | - Hyo-Seol Lee
- Assistant professor, Department of Pediatric Dentistry, School of Dentistry, at Kyung Hee University, Seoul, Korea;,
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Cho WC, Nam OH, Kim MS, Lee HS, Choi SC. A retrospective study of traumatic dental injuries in primary dentition: treatment outcomes of splinting. Acta Odontol Scand 2018; 76:253-256. [PMID: 29228861 DOI: 10.1080/00016357.2017.1414956] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVE Splinting in primary dentition is limited to several traumatic dental injuries. The prognosis associated with splint use has not been fully investigated. In this study, we investigated the outcomes of traumatic injuries in primary teeth treated with splinting. MATERIALS AND METHODS We retrospectively analysed 137 children with root fractures and lateral and extrusive luxation injuries to their primary teeth who were treated with semi-rigid splints between 2010 and 2016. Treatment outcomes were analysed in patients with follow-up periods of >6 months. The outcomes of splinting were based on clinical and radiographic evaluations performed during follow-up examinations. RESULTS In total, 182 primary teeth were examined, and of these, 90 teeth were treated using semi-rigid splints. In the splint group, pathological root resorption (31.1%) was the most common complication, whereas pathological tooth loss (25.0%) was found most common in the observation group. Splinting in root fractures showed a good prognosis, whereas in lateral and extrusive luxations, it did not (p < .05). There were no relationship between treatment delay and prognosis (p > .05). CONCLUSIONS Depending on the type of luxation, splint therapy results in acceptable outcomes and may be a feasible treatment option.
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Affiliation(s)
- Won Chang Cho
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Republic of Korea
| | - Ok Hyung Nam
- Department of Paediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Mi Sun Kim
- Department of Paediatric Dentistry, Kyung Hee University Dental Hospital at Gang-Dong, Seoul, Republic of Korea
| | - Hyo-Seol Lee
- Department of Paediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Sung Chul Choi
- Department of Paediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
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Nam OH, Kim MS, Kim GT, Choi SC. Atypical root resorption following root fractures in primary teeth. Quintessence Int 2017; 48:793-797. [PMID: 28990014 DOI: 10.3290/j.qi.a39078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Atypical root resorption (ARR) is the condition of a superficial and circumferential resorption process along the lateral and/or apical root surface of a primary maxillary incisor. This case series demonstrates longitudinal observations of six patients with atypical root resorption following root-fractured primary incisors. The characteristics of atypical root resorption were different from pathologic root resorption.
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Nam OH, Lee H, Kim MS, Lee HS, Choi SC. Simplified technique for easy extraction of impacted supernumerary teeth using guided surgery. Quintessence Int 2017; 48:563-567. [PMID: 28512653 DOI: 10.3290/j.qi.a38270] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Most mesiodens remain impacted and can affect the growth and development of adjacent permanent teeth. Impacted mesiodens are usually located in an intraosseous position associated with complicated anatomical structures, necessitating minimally invasive surgical approaches. This article demonstrates a simple customized surgical stent for extraction of impacted mesiodens. Its use and advantages are described.
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Yun KH, Lee HS, Nam OH, Moon CY, Lee JH, Choi SC. Analysis of bacterial community profiles of endodontically infected primary teeth using pyrosequencing. Int J Paediatr Dent 2017; 27:56-65. [PMID: 26872127 DOI: 10.1111/ipd.12226] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
OBJECTIVE The purpose of this study was to identify the endodontic microbiome in primary teeth with dental caries using high-throughput pyrosequencing and to establish data on the oral microbiome of primary teeth with endodontic infection. METHODS Ten primary teeth with dental caries and endodontic infection were included. Samples were collected from root canals using sterilized paper points and analyzed by pyrosequencing, based on the V1-V3 hypervariable region of the 16S rRNA gene. The data were analyzed using the CLcommunity software. RESULTS Analysis of the 10 samples yielded a total of 64,291 16S rRNA gene sequences. In total, 1586 OTUs (range, 91-235), six bacterial phyla, including unclassified, and 187 genera were assigned. At the genus level, Neisseria (group A), Acinetobacter (group B), and Fusobacterium (group C) were prominent. These predominant microorganisms were associated with the clinical condition and reflected the progression of endodontic infection in primary teeth. CONCLUSIONS This study revealed a relationship between the oral microbiome and endodontic infection in primary teeth. Additionally, anaerobic bacteria such as Fusobacterium species were dominant in the teeth with apical abscesses.
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Affiliation(s)
- Kwan Hee Yun
- Graduate School, Kyung Hee University, Seoul, Republic of Korea.,Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Ok Hyung Nam
- Graduate School, Kyung Hee University, Seoul, Republic of Korea.,Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Chan Yang Moon
- Graduate School, Kyung Hee University, Seoul, Republic of Korea.,Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Jae-Hyung Lee
- Department of Life and Nanopharmaceutical Sciences and Department of Maxillofacial Biomedical Engineering, school of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
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Kim SH, Cho YA, Nam OH, Kim MS, Choi SC, Lee HS. Complication After Extraction of Natal Teeth with Continued Growth of a Dental Papilla. Pediatr Dent 2016; 38:137-142. [PMID: 28281945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The purposes of this case report were to describe a growing two-cm gingival mass that developed after natal teeth were extracted in a four-month-old female patient, present a review of the literature on the growth of a gingival mass after the extraction of natal teeth, and illustrate the clinical and histological features that differentiate this condition from other types of gingival masses in infants. Histological examination of the excised mass revealed that it contained tooth-like hard tissue (regular and irregular dentin) that intermingled with bone, dental pulp, and fibrous tissue. We found eight cases from 1962 to 2009 in which a soft-tissue mass with dentin-like hard tissue or a tooth-like structure had developed after the extraction of natal teeth. Based on clinical and histological findings, we deduced that the mass was the result of abnormal growth of a residual dental papilla, including mesenchymal stem cells. Consequently, dentists, obstetricians, gynecologists, and pediatricians should be aware of this potential complication and observe caution before they extract natal teeth.
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Affiliation(s)
- Sook Hee Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Young-Ah Cho
- Department of Oral and Maxillofacial Pathology, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Mi Sun Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, South Korea.
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Abstract
Objectives The purpose of this study was designed to identify the oral microbiota in healthy Korean pre-school children using pyrosequencing. Materials and methods Dental plaque samples were obtained form 10 caries-free pre-school children. The samples were analysed using pyrosequencing. Results The pyrosequencing analysis revealed that, at the phylum level, Proteobacteria, Firmicutes, Bacteroidetes, Actinobacteria and Fusobacteria showed high abundance. Also, predominant genera were identified as core microbiome, such as Streptococcus, Neisseria, Capnocytophaga, Haemophilus and Veilonella. Conclusions The diversity and homogeneity was shown in the dental plaque microbiota in healthy Korean pre-school children.
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Affiliation(s)
- Soo Eon Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
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Ahn HJ, Nam OH, Lee HS, Kim EC, Cohenca N, Choi SC. Expression of inflammatory cytokines and MMPs on replanted teeth at different extra-alveolar time: an ex vivo and in vivo study. Int J Paediatr Dent 2016; 26:301-9. [PMID: 26547906 DOI: 10.1111/ipd.12211] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
BACKGROUND Immediately after the avulsed tooth is replanted, a complex inflammatory response ensues. As part of the periodontium healing process, the extracellular matrix macromolecules are essential to create the cellular environment required during healing and morphogenesis. AIM This study was designed to evaluate the correlation between different extra-alveolar dry times and inflammatory cytokines and matrix metalloproteinases (MMPs) as part of the periodontal ligament (PDL) gene expression. DESIGN The first phase of the study aimed testing human PDL cells ex vivo. Extracted teeth were dried for 15 and 30 min. The PDL cells were extracted and analyzed by qRT-PCR. The second phase was performed in vivo, and 36 Sprague Dawley rat first maxillary molars were extracted and replanted after 15, 30, and 60 min extra-alveolar time. We tested the levels of inflammatory cytokines and MMPS in periodontal tissue at 3, 7, and 28 days after tooth replantation. The replanted area was dissected, grounded, and analyzed by RT-PCR. RESULTS Expressions of IL-1β, IL-6, TNF-α, and MMP-3 and MMP-9 were significantly higher in the replanted teeth. Extended dry time had a direct correlation with induction of pro-inflammatory cytokine and MMPs in PDL cells. CONCLUSION Our study showed that pro-inflammatory cytokines were more significantly expressed in the tissues surrounding the replanted teeth. Future research must be undertaken to additionally confirm the release of these cytokines and be focused on the inhibition of these cytokines to reduce inflammation of replanted teeth.
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Affiliation(s)
- Hyo Jung Ahn
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Eun-Cheol Kim
- Maxillofacial Tissue Regeneration and Research Center for Tooth & Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Nestor Cohenca
- Department of Endodontics and Pediatric Dentistry, University of Washington, Seattle, WA, USA
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
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Lim HC, Nam OH, Kim MJ, El-Fiqi A, Yun HM, Lee YM, Jin GZ, Lee HH, Kim HW, Kim EC. Delivery of dexamethasone from bioactive nanofiber matrices stimulates odontogenesis of human dental pulp cells through integrin/BMP/mTOR signaling pathways. Int J Nanomedicine 2016; 11:2557-67. [PMID: 27354790 PMCID: PMC4907710 DOI: 10.2147/ijn.s97846] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Therapeutically relevant design of scaffolds is of special importance in the repair and regeneration of tissues including dentin and pulp. Here we exploit nanofiber matrices that incorporate bioactive glass nanoparticles (BGNs) and deliver the odontogenic drug dexamethasone (DEX) to stimulate the odontogenic differentiation of human dental pulp cells (HDPCs). DEX molecules were first loaded onto the BGN, and then the DEX-BGN complex was incorporated within the biopolymer nanofiber matrix through electrospinning. The release of DEX continued over a month, showing a slow releasing profile. HDPCs cultured on the DEX-releasing BGN matrices were viable, proliferating well up to 14 days. The odontogenic differentiation, as assessed by alkaline phosphatase activity, mRNA expression of genes, and mineralization, was significantly stimulated on the matrices incorporating BGN and further on those releasing DEX. The DEX-releasing BGN matrices highly upregulated the expression of the integrin subsets α1, α5, and β3 as well as integrin downstream signaling molecules, including focal adhesion kinase (FAK), Paxillin, and RhoA, and activated bone morphogenetic protein mRNA and phosphorylation of Smad1/5/8. Furthermore, the DEX-releasing BGN-matrices stimulated Akt and mammalian target of rapamycin (mTOR), which was proven by the inhibition study. Collectively, the designed therapeutic nanofiber matrices that incorporate BGN and deliver DEX were demonstrated to promote odontogenesis of HDPCs, and the integrins, bone morphogenetic protein, and mTOR signaling pathways are proposed to be the possible molecular mechanisms. While further in vivo studies are still needed, the DEX-releasing bioactive scaffolds are considered as a potential therapeutic nanomatrix for regenerative endodontics and tissue engineering.
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Affiliation(s)
- Hyun-Chang Lim
- Department of Periodontology, Kyung Hee University, Seoul, Republic of Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Mi-joo Kim
- Department of Oral and Maxillofacial Pathology, Research Center for Tooth and Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Ahmed El-Fiqi
- Department of Nanobiomedical Science, BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Republic of Korea
- Institute of Tissue Regeneration Engineering, Dankook University, Cheonan, Republic of Korea
| | - Hyung-Mun Yun
- Department of Oral and Maxillofacial Pathology, Research Center for Tooth and Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Yoo-Mi Lee
- Department of Oral and Maxillofacial Pathology, Research Center for Tooth and Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
| | - Guang-Zhen Jin
- Department of Nanobiomedical Science, BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Republic of Korea
- Institute of Tissue Regeneration Engineering, Dankook University, Cheonan, Republic of Korea
| | - Hae-Hyoung Lee
- Institute of Tissue Regeneration Engineering, Dankook University, Cheonan, Republic of Korea
- Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Hae-Won Kim
- Department of Nanobiomedical Science, BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Republic of Korea
- Institute of Tissue Regeneration Engineering, Dankook University, Cheonan, Republic of Korea
- Department of Biomaterials Science, College of Dentistry, Dankook University, Cheonan, Republic of Korea
| | - Eun-Cheol Kim
- Department of Oral and Maxillofacial Pathology, Research Center for Tooth and Periodontal Regeneration (MRC), School of Dentistry, Kyung Hee University, Seoul, Republic of Korea
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Affiliation(s)
- Won Chang Cho
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University
| | - Mi Sun Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University
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Song KU, Nam OH, Kim MS, Choi SC, Lee HS. An 18-year-old patient with Prader-Willi syndrome: a case report on dental management under sedation and general anesthesia. J Dent Anesth Pain Med 2015; 15:251-255. [PMID: 28879288 PMCID: PMC5564163 DOI: 10.17245/jdapm.2015.15.4.251] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 11/10/2015] [Accepted: 11/17/2015] [Indexed: 11/23/2022] Open
Abstract
Prader-Willi syndrome (PWS) is a rare genetic disorder reported rarely in dentistry. Dental practitioners should know the features of PWS because affected patients have a variety of dental symptoms. The current report describes a case of PWS. An 18-year-old male patient presented with traumatic injuries. Initial emergency treatments were performed under sedation, and further treatments were conducted under general anesthesia. After adequate healing, periodic follow-up and dietary management according to the patient's age and nutritional phase were recommended. Dental management of PWS patients consists of active preventive measures in addition to dietary consultation according to age and nutritional phase.
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Affiliation(s)
- Ki Un Song
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Mi Sun Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
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Nam OH, Lee HS, Kim MS, Yun KH, Bang JB, Choi SC. Characteristics of Mesiodens and Its Related Complications. Pediatr Dent 2015; 37:E105-E109. [PMID: 26883604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
PURPOSE The purpose of this study was to evaluate the effect of mesiodens on adjacent permanent anterior teeth according to mesiodens characteristics. METHODS To evaluate complications associated with mesiodens, according to its characteristics, a total of 107 children were studied who had a chief complaint of mesiodens. The number, morphology, direction of eruption, position of mesiodens, root developmental stage and complications related to adjacent permanent maxillary central incisors (APMCIs) were evaluated by radiographic imaging. RESULTS The final sample was 107 children and total number of mesiodens was 153. Among these patients, 67 percent showed clinical complications. The primary morphologic type was conical (96.1 percent) and the most common direction of eruption was inverted (56.2 percent). Most mesiodens (80.4 percent) were located on the palatal side of the APMCIs. CONCLUSIONS The direction of mesiodens and the eruption period of adjacent permanent incisors affected the complication rate. The positional relationship between mesiodens and adjacent permanent central incisors had the strongest influence on both eruption disturbance and displacement of permanent central incisors.
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Affiliation(s)
- Ok Hyung Nam
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Hyo-Seol Lee
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Mi Sun Kim
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Kwan Hee Yun
- Department of Dentistry, Graduate School, Kyung Hee University, Seoul, Korea
| | - Jae-Beum Bang
- Department of Dental Education, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - Sung Chul Choi
- Department of Pediatric Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea.
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