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Kim RJY, Kim DH, Seo DG. Post-polymerization of three-dimensional printing resin using a dental light curing unit. J Dent Sci 2024; 19:945-951. [PMID: 38618100 PMCID: PMC11010625 DOI: 10.1016/j.jds.2023.07.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 06/23/2023] [Revised: 07/24/2023] [Indexed: 04/16/2024] Open
Abstract
Background/Purpose In vat photopolymerization, post-polymerization of the three-dimensional (3D) printing resin is necessary to ensure the optimum physical properties of the printed objects. This study aimed to evaluate the potential use of a handheld polywave light-emitting diode (LED) dental light-curing unit (LCU) for post-polymerizing 3D printed resins by measuring the microhardness and biaxial flexural strength of the post-polymerized resin. Material and methods 3D printed 1- and 2-mm-thick disks were irradiated with a dental LCU at 3200 mW/cm2. Post-polymerization was repeated either on one side from the top surface: two cycles (T2), four cycles (T4), and eight cycles (T8), or on both sides from the top and bottom surfaces: one cycle (T1B1), two cycles (T2B2), and four cycles (T4B4) for each side. The microhardness and biaxial strength of the disks were compared to those post-polymerized by a conventional desktop polymerizing unit (PC) and those without post-polymerization (NC). Results Microhardness of the disks varied between the top and bottom surfaces of the 1-mm and 2-mm-thick disks, depending on the post-polymerization methods. T8 and T4B4 produced comparable microhardness on the top surface to PC for both thicknesses. In contrast, PC, T2B2, and T4B4 exhibited the highest microhardness on the bottom surface. Except for NC, the 1-mm-thick disks had a higher biaxial flexural strength than the 2-mm-thick disks. T4B4 resulted in the highest biaxial flexural strength for both thicknesses, which was comparable to that of the desktop polymerizing unit. Conclusion The microhardness and biaxial flexural strengths of the post-polymerized 3D-printed disks increase with polymerization time. With sufficient polymerization from both sides, the polywave LCU has the potential to be a viable alternative to desktop polymerization units.
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Affiliation(s)
- Ryan Jin Young Kim
- Department of Dental Science, Dental Research Institute, Seoul National University School of Dentistry, Seoul, Republic of Korea
| | - Dong-Hwan Kim
- Seoul Gospel Dental Clinic, Seoul, Republic of Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, Dental Research Institute, Seoul National University School of Dentistry, Seoul, Republic of Korea
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Jung MK, Jeon MJ, Kim JH, Son SA, Park JK, Seo DG. Comparison of the stress distribution in base materials and thicknesses in composite resin restorations. Heliyon 2024; 10:e25040. [PMID: 38333812 PMCID: PMC10850536 DOI: 10.1016/j.heliyon.2024.e25040] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Revised: 01/17/2024] [Accepted: 01/18/2024] [Indexed: 02/10/2024] Open
Abstract
Resin-based composite materials are commonly used for restorations, but their dimensional changes during the polymerization could cause various clinical problems. This study evaluated the influence of a base of different materials and thicknesses on the stress magnitude and distribution in a second maxillary premolar with an MOD resin composite restoration using three-dimensional finite element analysis. A sound tooth without cavity was considered as the control group (ST), and another group was restored with composite resin without applying a base material in a MOD cavity (CR). The other three groups were restored with composite resin along with the following base materials: glass ionomer cement, low-viscosity resin, and tricalcium silicate, respectively (CR-GIC, CR-LR, and CR-TS). These three groups were further divided into two subgroups according to the thickness of the base layer: thin (0.5 mm) and thick (1.0 mm). The stress distribution was compared using the maximum principal stress after polymerization shrinkage and vertical loading with 600 N on the occlusal surface. Group ST showed the lowest stress value, and its stress propagation was confined to outer enamel surfaces only. Group CR demonstrated the highest stress distribution in the tooth-restoration interface with increased failure risk on marginal areas. The thin and thick subgroups of the three groups with a base layer had lower stress levels than Group CR. The base materials reduced the marginal stress caused by polymerization shrinkage of composite resin in MOD cavities. Different base materials and thicknesses did not affect the stress distribution.
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Affiliation(s)
- Min-Kwan Jung
- Department of Conservative Dentistry, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
| | - Mi-Jeong Jeon
- Department of Conservative Dentistry, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
- Department of Conservative Dentistry, College of Dentistry, Gangnam Severance Hospital, Yonsei University, Seoul, Republic of Korea
| | - Jae-Hoon Kim
- Department of Dental Education, Dental Research Institute, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Sung-Ae Son
- Department of Conservative Dentistry, Dental Research Institute, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Jeong-Kil Park
- Department of Conservative Dentistry, Dental Research Institute, Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
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Lee H, Young Kim RJ, Seo DG. Shear bond strength of dual-cured resin cements on zirconia: The light-blocking effect of a zirconia crown. J Dent Sci 2024; 19:162-168. [PMID: 38303887 PMCID: PMC10829558 DOI: 10.1016/j.jds.2023.05.011] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/08/2023] [Indexed: 02/03/2024] Open
Abstract
Abstract Background/purpose The presence of restorative material between resin cement and the light-curing unit can reduce light transmission. This study aimed to evaluate the effect of the light-blocking effect of zirconia crown on shear bond strength (SBS) between three dual-cured resin cements and the zirconia surface. Materials and methods Sixty zirconia specimens were prepared and divided into three groups according to the type of resin cement [RXU (RelyX Ultimate); SC2 (SmartCem2); MEC (Maxcem Elite Chroma)]. Each group was further divided into two subgroups, with or without a 1-mm-thick zirconia crown (n = 10). The specimens were light-cured from five different directions for 20 s each. All specimens were thermocycled 5000 times and subjected to SBS testing, followed by scanning electron microscope examination. Results The presence of a 1-mm-thick zirconia crown had no significant effect on the SBS in all resin cements. However, the SBS was significantly affected by type of resin cement. RXU showed the highest SBS (8.35 MPa with crown; 8.57 MPa without crown), followed by SC2 (5.48 MPa with crown; 5.57 without crown) and then MEC (3.37 MPa with crown; 4.04 MPa without crown. Fractured surfaces exhibited varying degrees of mixed failure patterns. Conclusion A 1-mm-thick zirconia crown material between the light source and the dual-cured resin cement did not significantly influence the SBS of the resin cements on the zirconia substrates. RXU exhibited the highest SBS regardless of zirconia crown coverage. With sufficient light-curing, dual-cured resin cements can be a good choice for zirconia crown cementation.
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Affiliation(s)
- Hyesoo Lee
- Seoul Kwon Dental Clinic, Seoul, South Korea
| | - Ryan Jin Young Kim
- Department of Dental Sciences, Dental Research Institute, Seoul National University School of Dentistry, Seoul, South Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, Dental Research Institute, Seoul National University School of Dentistry, Seoul, South Korea
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Jin WJ, Yoo YJ, Park JK, Seo DG. Lipopolysaccharide penetration analysis of two different resin cement systems to dentin and ceramic surface. J Dent Sci 2023; 18:1740-1746. [PMID: 37799927 PMCID: PMC10547958 DOI: 10.1016/j.jds.2022.12.013] [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: 09/23/2022] [Revised: 12/18/2022] [Indexed: 01/04/2023] Open
Abstract
Background/purpose One of the challenges in adhesive ceramic restorations is deterioration of tooth-cement-ceramic interfaces. This study was to quantitatively investigate lipopolysaccharide (LPS) penetration through adhesive ceramic restorations. Materials and methods Standardized holes were formed on ceramic (IPS Empress CAD, Ivoclar Vivadent) and human dentin discs. Prepared discs were randomly assigned to experimental groups (n = 6/group): SC, self-adhesive resin cement (SmartCem 2, Dentsply Sirona) bonded to ceramic discs; ST, self-adhesive resin cement bonded to dentin discs; VC, etch-and-rinse resin cement (Variolink II, Ivoclar Vivadent AG) bonded to ceramic discs; VT, etch-and-rinse resin cement bonded to dentin discs. The specimens underwent thermocycling (10,000 cycles; 5-55 °C) then LPS penetration test until 5-weeks. A mixed effect analysis using R statistical language was performed for data analysis. Results Dentin and ceramic bonded with etch-and-rinse resin cements (groups VT and VC) showed significantly less penetration than those with self-adhesive resin cement (groups ST and SC) (P < 0.05). ST showed significantly lower penetration than SC (P < 0.05), that showed similar penetration with positive control (P > 0.05). VC showed minimal penetration during observed time of period (P < 0.05). Scanning electron microscope observations showed different interfacial characteristics among the groups. Conclusion Within the limitation of this study, etch-and-rinse resin cement showed less LPS penetration than self-adhesive resin cement on both ceramic and dentin surfaces.
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Affiliation(s)
- Won-Jang Jin
- Department of Conservative Dentistry, Dental Research Institute, Seoul National University School of Dentistry, Seoul, Republic of Korea
| | - Yeon-Jee Yoo
- Department of Comprehensive Treatment Centre, Seoul National University Dental Hospital, Seoul, Republic of Korea
| | - Jeong-Kil Park
- Department of Conservative Dentistry, Dental and Life Science Institute, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Republic of Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, Dental Research Institute, Seoul National University School of Dentistry, Seoul, Republic of Korea
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Jeon MJ, Park JW, Seo DG. Intratubular crystal formation in the exposed dentin from nano-sized calcium silicate for dentin hypersensitivity treatment. Sci Rep 2023; 13:14243. [PMID: 37648709 PMCID: PMC10469191 DOI: 10.1038/s41598-023-30351-2] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 02/21/2023] [Indexed: 09/01/2023] Open
Abstract
The aim of this study is to evaluate intratubular crystal formation from the experimental material consisting of dicalcium silicate (C2S) and tricalcium silicate (C3S) with nano-scaled particle size. A total of twenty-four specimens were made by isolating 8 mm of the cervical part centered at the cementoenamel junction of extracted premolars. Twelve specimens were not treated and considered as control. The experimental material was applied to the other twelve specimens by brushing for 10,000 strokes. Each group was randomly divided into four subgroups according to the period of immersion in phosphate buffer saline (PBS) for 1, 30, 60, and 90 days each. The specimens were sectioned longitudinally and examined with scanning electron microscopy and energy dispersion X-ray spectroscopy. The intratubular crystal were formed in PBS and densely filled the dentinal tubules over time. The crystal formation occurred at a depth of more than 50 μm from the dentin surface. The Ca/P ratio of formed intratubular crystals was 1.68 after 3 months. The experimental material consisting of C2S and C3S with a nanoscale particle size can form hydroxyapatite-like crystals in dentinal tubules in PBS, and there is a possibility of reducing dentin hypersensitivity by blocking the dentinal fluid flow.
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Affiliation(s)
- Mi-Jeong Jeon
- Department of Conservative Dentistry, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea
- Department of Conservative Dentistry, College of Dentistry, Gangnam Severance Hospital, Yonsei University, Seoul, Republic of Korea
| | - Jeong-Won Park
- Department of Conservative Dentistry, College of Dentistry, Gangnam Severance Hospital, Yonsei University, Seoul, Republic of Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Republic of Korea.
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Hong S, Go B, Rho J, An S, Lim C, Seo DG, Ihm J. Effects of a blended design of closed-book and open-book examinations on dental students' anxiety and performance. BMC Med Educ 2023; 23:25. [PMID: 36635682 PMCID: PMC9836918 DOI: 10.1186/s12909-023-04014-9] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 01/09/2023] [Indexed: 05/31/2023]
Abstract
BACKGROUND While closed-book examinations (CBEs) have traditionally been implemented in dental education, open-book examinations (OBEs) are being introduced for the purpose of acquiring higher levels of knowledge and promoting long-term memory. This study examines whether it is effective to use a blended assessment of CBEs and OBEs for dental students to reduce test anxiety and enhance academic performance. METHODS Using a quasi-experimental research method, a blended assessment that combined CBEs in class and OBEs online was designed for a dental course. In 2020, when the pandemic was at its peak, student assessment was ineffective, and the 2020 cohort was omitted for our study; instead, two cohorts of predoctoral dental students (N = 178) enrolled in Restorative Dentistry in the spring semesters of 2019 and 2021 were included in the study. These students were informed about the experimental design, and they provided written consent for data collection, thereby voluntarily participating in the survey. Their self-perceived responses to open-ended survey questions on assessment methods were qualitatively analyzed. RESULTS There was no significant difference in test anxiety between the CBEs and OBEs at the p-values of 0.001 in all items. Traditional and blended assessment showed a similar trend of lower scores in midterm exams compared to higher scores in final exams, thus discriminating against students' performances. In particular, a low-achieving group was better predicted by a blended assessment. An analysis of the students' self-perceived responses produced highly topical themes, including exam burden, learning effects, and fairness issues. CONCLUSIONS This study confirmed the feasibility of blended assessment that can be implemented in online and in-person educational environments. Moreover, it can be used as the groundwork to develop new models of assessment in dental education.
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Affiliation(s)
- Sumin Hong
- Department of Education, Seoul National University, Seoul, Korea
| | - Bokyung Go
- Department of Education, Seoul National University, Seoul, Korea
| | - Jaehee Rho
- Department of Education, College of Educational Science, Yonsei University, Seoul, Korea
| | - Soyoun An
- Department of Pediatric Dentistry &, College of Dentistry, Wonkwang Bone Regeneration Research Institute, Wonkwang University, Iksan-Si, Korea
| | - Cheolil Lim
- Department of Education, Seoul National University, Seoul, Korea
| | - Deog-Gyu Seo
- Dental Research Institute, School of Dentistry, Seoul National University, Gwanak-Ro 1, Gwanak-Gu, Seoul, Republic of Korea.
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, 101 Daehakno, Jongno-Gu, Seoul, Republic of Korea.
| | - Jungjoon Ihm
- Dental Research Institute, School of Dentistry, Seoul National University, Gwanak-Ro 1, Gwanak-Gu, Seoul, Republic of Korea.
- Department of Dental Education, School of Dentistry, Seoul National University, Seoul, Korea.
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Shin Y, Lim J, Kim Y, Seo DG, Ihm J. Effects of virtual body-representation on motor skill learning. Sci Rep 2022; 12:15283. [PMID: 36088480 PMCID: PMC9464243 DOI: 10.1038/s41598-022-19514-9] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 08/30/2022] [Indexed: 11/16/2022] Open
Abstract
Motor learning is often hindered or facilitated by visual information from one's body and its movement. However, it is unclear whether visual representation of the body itself facilitates motor learning. Thus, we tested the effects of virtual body-representation on motor learning through a virtual reality rotary pursuit task. In the task, visual feedback on participants' movements was identical, but virtual body-representation differed by dividing the experimental conditions into three conditions: non-avatar, non-hand avatar, and hand-shaped avatar. We measured the differences in the rate of motor learning, body-ownership, and sense of agency in the three conditions. Although there were no differences in body-ownership and sense of agency between the conditions, the hand-shaped avatar condition was significantly superior to the other conditions in the rate of learning. These findings suggest that visually recognizing one's body shape facilitates motor learning.
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Affiliation(s)
- Yongmin Shin
- Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Jaeseo Lim
- Interdisciplinary Program in Cognitive Science, Seoul National University, Seoul, Republic of Korea
| | - Yonggwan Kim
- Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Deog-Gyu Seo
- Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
| | - Jungjoon Ihm
- Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
- Interdisciplinary Program in Cognitive Science, Seoul National University, Seoul, Republic of Korea.
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Park S, Kim JH, Lee MK, Ihm JJ, Ahn JS, Park JK, Seo DG. In vivo real-time temperature measurement on the surface of intact and gold-restored teeth during consumption of hot and cold drinks. Eur J Oral Sci 2022; 130:e12870. [PMID: 35490397 DOI: 10.1111/eos.12870] [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: 01/25/2022] [Accepted: 04/11/2022] [Indexed: 11/28/2022]
Abstract
This study aimed to measure real-time temperature changes in gold-restored teeth compared with intact teeth during the intake of hot and cold drinks. Sixteen molars, including eight natural intact teeth and eight restored teeth with gold inlays, were selected from the participants. Custom-made thermocouple sensors were attached to the coronal third of the buccal surface of teeth. Participants consecutively consumed hot and cold drinks according to a standardized regimen. Resting, maximum, and minimum temperatures; time to reach peak temperatures; and heating and cooling velocities were obtained. Statistical analysis was performed using independent two-sample t-test. Teeth with gold restorations showed a significantly higher maximum temperature (44.7 °C [SD 2.9]) than did natural teeth (40.5 °C [SD 1.2]) during hot water drinking and showed a lower minimum temperature (25.0 °C [SD 4.9]) than did natural teeth (31.5 °C [SD 3.1]) during cold water drinking. The heating and cooling rates for the teeth with gold restorations were two and three times higher than those of the natural teeth. Gold-restored teeth showed greater temperature change than intact teeth in terms of magnitude and velocity in response to temperature changes induced by hot and cold drinks.
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Affiliation(s)
- Soojin Park
- Seoulbombom Dental Clinic, Seoul, Republic of Korea
| | - Jae-Hoon Kim
- Department of Dental Education, Dental and Life Science Institute, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Republic of Korea
| | - Min-Kyung Lee
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Jung-Joon Ihm
- Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Jin-Soo Ahn
- Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Jeong-Kil Park
- Department of Conservative Dentistry, Dental and Life Science Institute, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Republic of Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
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Son SA, Kim BN, Kim JH, Seo DG, Park JK. Influence of Dentin Surface Roughness, Drying Time, and Primer Application on Self-adhesive Composite-Cement Bond Strength. J Adhes Dent 2022; 24:137-146. [PMID: 35416441 DOI: 10.3290/j.jad.b2916387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
PURPOSE To investigate the effect of roughness and drying time of dentin as well as the number of coats of a self-adhesive composite-cement primer on the bond strength of self-adhesive composite cement. MATERIAL AND METHODS Sixty human teeth were prepared and assigned to 12 groups (n = 5), according to three experimental factors: 1) dentin surface roughness, rough or fine, as achieved by 250- and 600-grit silicon carbide papers, respectively; 2) dentin wetness based on air-drying time (5 or 10 s); and 3) the self-adhesive composite-cement primer applications (no-coat, 1-coat, and 2-coat). Composite resin blocks were made with hybrid composite resin (M1 GraceFil) and cemented with G-CEM ONE (both GC). Cement-dentin sticks (12) were prepared, and the microtensile bond strength (μTBS) test was performed. Failure modes were observed with a stereomicroscope (40X), and bonding interfaces were evaluated with confocal laser scanning microscopy (CLSM). Statistical analysis was performed using three-way ANOVA and Tukey's post-hoc comparisons test (α = 0.05). RESULTS Dentin roughness (250-grit > 600-grit, p = 0.000), drying time (5-s drying > 10-s drying, p = 0.000), and primer application (no-coat < 1-coat = 2-coat, p = 0.000) had significant effects on bond strength. These factors also showed significant interactions with each other (p = 0.003). The highest μTBS (31.8 ± 3.1 MPa) was observed in the 1-coat/fine roughness/10-s drying group and the lowest μTBS (13.4 ± 2.7 MPa) in the no-coat/coarse roughness/5-s drying group. CLSM showed higher penetration of cement in the primer-coated groups compared to that in the no-coat groups. CONCLUSION Bond strength between the self-adhesive composite cement and dentin was higher in the fine-roughness dentin group than in the coarse-roughness dentin group, and in the 5-s drying group compared to the 10-s drying group. Applying a primer to dentin improved bond strength of the self-adhesive composite cement.
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Son SA, Kim JH, Seo DG, Park JK. Influence of different inlay configurations and distance from the adjacent tooth on the accuracy of an intraoral scan. J Prosthet Dent 2021; 128:680-687. [PMID: 33712313 DOI: 10.1016/j.prosdent.2020.12.044] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 12/22/2020] [Accepted: 12/22/2020] [Indexed: 10/21/2022]
Abstract
STATEMENT OF PROBLEM Clinical guidelines for obtaining accurate scan data during the intraoral scanning of inlay cavities with various configurations and interproximal distances are lacking. PURPOSE The purpose of this in vitro study was to evaluate the effect of interproximal distance and cavity type on the accuracy of digital scans for inlay cavities, including proximal cavities. MATERIAL AND METHODS Four artificial teeth with 4 types of inlay cavities designed based on the buccolingual width and gingival level of the proximal box were installed in a mannequin at distances of 0.6, 0.8, and 1.0 mm from the adjacent teeth. Reference scans of the 4 artificial teeth were obtained by using a laboratory scanner. The CEREC Primescan AC was used to acquire digital scan data (each n=10). Standard tessellation language (STL) files were analyzed with a 3-dimensional analysis software program. The mean deviation values were measured with a 3-dimensional best-fit alignment method to evaluate the accuracy of the digital scan data. Statistical analyses were performed by using 2-way ANOVA and the Bonferroni multiple comparison test (α=.05). RESULTS As per the interproximal distance, the 1.0-mm group showed significantly higher trueness than the 0.6-mm group (P<.05). As the interproximal distance increased, the maximum positive deviation significantly decreased (P<.05). Maximum negative deviation and precision of the scan data were not significantly different among the distance groups (P>.05). Cavity type had a significant influence on the trueness and precision of the scan data (P<.05). In particular, the narrow long cavity type had an adverse effect on the precision and maximum positive deviation of scan data. CONCLUSIONS During the intraoral scanning of class II inlay restoration, interproximal distance and cavity type affected the accuracy of an intraoral scan. As the interproximal distance increased, the trueness of the acquired digital images increased and the maximum positive deviation significantly decreased. The narrow long cavity type negatively affected the mean maximum positive deviation and precision of scan data.
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Affiliation(s)
- Sung-Ae Son
- Associate Professor, Department of Conservative Dentistry, Dental and Life Science Institute, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Republic of Korea
| | - Jae-Hoon Kim
- Assistant Professor, Department of Dental Education, Dental and Life Science Institute, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Republic of Korea
| | - Deog-Gyu Seo
- Professor, Department of Conservative Dentistry, School of Dentistry, Seoul National University, Dental Research Institute, Seoul, Republic of Korea
| | - Jeong-Kil Park
- Professor, Department of Conservative Dentistry, Dental and Life Science Institute, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Republic of Korea.
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Ihm J, Shin Y, Seo DG. Did Clinical Reasoning and Knowledge Questions During Team-Based Learning Enhance Dental Students' Performance in Esthetic Dentistry? J Dent Educ 2020; 84:495-501. [PMID: 32314390 DOI: 10.21815/jde.019.191] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 11/19/2019] [Indexed: 11/20/2022]
Abstract
The aim of this study was to assess whether clinical reasoning and factual knowledge questions used in team-based learning (TBL) enhanced dental students' performance in esthetic dentistry. Ninety-seven third-year dental students enrolled in esthetic dentistry in a dental school in Korea in 2018 were assigned to 16 teams consisting of five or six students each. A four-step TBL sequence (pre-study, readiness assurance test, appeal/feedback, and final test) was designed to examine how clinical reasoning and knowledge questions affected academically high- and low-achieving students. The analysis was conducted with 87 students' data because ten students failed to answer some questions. The results showed that team performance in TBL was consistently better than individual performance. The TBL sessions enhanced students' critical thinking skills, though it did not affect their knowledge acquisition. The clinical reasoning questions especially benefited the academically low-achieving students. Overall, TBL was an effective method for teaching these dental students using small-group learning in esthetic dentistry. Team-based cooperative learning facilitated a deeper understanding of esthetic dentistry because students were motivated to think critically and solve problems rather than simply memorize factual knowledge.
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Lee D, Bae H, Ahn J, Kang T, Seo DG, Hwang DS. Catechol-thiol-based dental adhesive inspired by underwater mussel adhesion. Acta Biomater 2020; 103:92-101. [PMID: 31811956 DOI: 10.1016/j.actbio.2019.12.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 11/22/2019] [Accepted: 12/02/2019] [Indexed: 12/21/2022]
Abstract
The critical problem associated with the underwater mussel adhesive catechol-based 3,4-dihydroxy-L-phenylalanine (DOPA) is its sensitivity to oxidation. To overcome this problem, mussels underwent etching in the presence of acidic pH conditions (<3.0), and thiol chemistry was used to control the propensity of DOPA for oxidation. Similar strategies deployed by mussels are also actively utilized in dental adhesives which undergo etching in the presence of phosphoric acid derivatives to maximize the bonding strength and adapt thiol chemistries to minimize shrinkage stress. In view of the similarities between dental and underwater mussel adhesives, we employ in this study the strategy of mussel adhesion-the combination of DOPA and thiol chemistry with acid etching-to one of the most critical issues in dental adhesives, namely, the dentin bonding with zirconia. As a result, the adhesion bonding between zirconia and dentin, one of the most elusive problems in dentistry, has improved compared to the commercially available adhesive resin formulation. In addition, in view of the similar human oral and mussel adhesive environments, our findings will considerably contribute to the translation of the adhesive system inspired by mussels. STATEMENT OF SIGNIFICANCE: Mussels are effectively operated by creating an acidic environment when adhering with 3,4-dihydroxy-l-phenylalanine (DOPA)-thiol redox chemistry for underwater bonding. Similarly, in dental adhesives, phosphoric acid-based etching is used for dentin-bonding materials. In view of the similarity between dental adhesives and underwater mussel adhesives, the combination of DOPA and thiol chemistry with acid etching can be used to overcome one of the most critical issues in dentin medical adhesives. The proposed adhesion method produces high adhesion strengths compared to those currently used in dentin and zirconia adhesives. Here, we extend and evaluate dentin and zirconia dental adhesives by mixing with mussel (DOPA)-thiol redox chemistry and acid etching.
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Kim KK, Ha I, Won P, Seo DG, Cho KJ, Ko SH. Transparent wearable three-dimensional touch by self-generated multiscale structure. Nat Commun 2019; 10:2582. [PMID: 31197161 PMCID: PMC6565712 DOI: 10.1038/s41467-019-10736-6] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [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: 01/23/2019] [Accepted: 05/28/2019] [Indexed: 11/09/2022] Open
Abstract
Pressure-sensitive touch panels can measure pressure and location (3D) information simultaneously and provide an intuitive and natural method for expressing one’s intention with a higher level of controllability and interactivity. However, they have been generally realized by a simple combination of pressure and location sensor or a stylus-based interface, which limit their implementation in a wide spectrum of applications. Here, we report a first demonstration (to our knowledge) of a transparent and flexible 3D touch which can sense the 3D information in a single device with the assistance of functionally designed self-generated multiscale structures. The single 3D touch system is demonstrated to draw a complex three-dimensional structure by utilizing the pressure as a third coordinate. Furthermore, rigorous theoretical analysis is carried out to achieve the target pressure performances with successful 3D data acquisition in wireless and wearable conditions, which in turn, paves the way for future wearable devices. Touch technology holds potential for the development of smartphones and touchscreens, yet the conventional devices are usually built on separate pressure and location sensing units. Kim et al. show a flexible and transparent touch sensor capable of mapping the position and pressure at the same time.
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Affiliation(s)
- Kyun Kyu Kim
- Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - InHo Ha
- Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Philip Won
- Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, 28 Yeongun-dong, Chongno-Gu, Seoul, 03080, Korea.
| | - Kyu-Jin Cho
- Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea
| | - Seung Hwan Ko
- Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Korea. .,Institute of Advanced Machines and Design, Seoul National University, Seoul, 08826, Korea. .,Institute of Engineering Research, Seoul National University, Seoul, 08826, Korea.
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Ihm JJ, An SY, Seo DG. Do Dental Students’ Personality Types and Group Dynamics Affect Their Performance in Problem-Based Learning? J Dent Educ 2017; 81:744-751. [DOI: 10.21815/jde.017.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 01/27/2017] [Indexed: 11/20/2022]
Affiliation(s)
- Jung-Joon Ihm
- Office of Dental Education; School of Dentistry; Seoul National University; Republic of Korea
| | - So-Youn An
- Department of Pediatric Dentistry; School of Dentistry, Wonkwang University; Republic of Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry; School of Dentistry, Seoul National University; Republic of Korea
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Son SA, Park JK, Seo DG, Ko CC, Kwon YH. How light attenuation and filler content affect the microhardness and polymerization shrinkage and translucency of bulk-fill composites? Clin Oral Investig 2016; 21:559-565. [PMID: 27475636 DOI: 10.1007/s00784-016-1920-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [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: 09/17/2015] [Accepted: 07/20/2016] [Indexed: 11/30/2022]
Abstract
OBJECTIVES The purpose of this study was to investigate the microhardness, polymerization shrinkage, and translucency of bulk-fill composites (BFCs) which have different light attenuation properties and filler contents. MATERIALS AND METHODS Five BFCs [Filtek Bulk Fill (FB), SureFil SDR (SS), Venus Bulk Fill (VB), SonicFill (SF), and Tetric N-Ceram Bulk Fill (TB)] and two resin-based composites (RBCs) [Tetric N-Ceram (TN) and Filtek Z350XT Flowable (ZF)] were chosen. Numbers of transmitted photons, refractive index, microhardness at different thicknesses, polymerization shrinkage, and translucency parameter (TP) were evaluated. RESULTS Attenuation coefficients (ACs) based on measured photons ranged from -0.88 to -1.90. BFCs, except SF, had lower AC values than TN or ZF, and BFCs, except TN, had smaller refractive index decreases between top and bottom surfaces. Regardless of an exponential decrease in photon counts, microhardness decreased linearly as specimen thickens. Moreover, microhardness of BFCs showed smaller top-to-bottom decreases (11.5-48.8 %) than TN or ZF (57.3 and 71.5 %, respectively). BFCs with low filler contents showed lower microhardness and higher polymerization shrinkage than those of high filler contents. Also, BFCs had significantly higher (p < 0.001) TP values than TN or ZF. CONCLUSION BFCs attenuated light less than RBCs. However, some BFCs had much lower top surface microhardness and higher polymerization shrinkage than tested RBCs. CLINICAL RELEVANCE Despite the convenience of bulk filling, careful selection of BFC is advised because some BFCs have worse microhardness and polymerization shrinkage than RBCs due to their lower filler contents.
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Affiliation(s)
- Sung-Ae Son
- Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan, 50612, South Korea
| | - Jeong-Kil Park
- Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan, 50612, South Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, 02707, South Korea
| | - Ching-Chang Ko
- Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Yong Hoon Kwon
- Department of Dental Materials, School of Dentistry, Dental Research Institute, Pusan National University Dental Hospital, Pusan National University, Yangsan, 50612, South Korea.
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Affiliation(s)
- Jung-Joon Ihm
- Office of Dental Education; School of Dentistry; Seoul National University; Seoul Republic of Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry and Dental Research Institute; School of Dentistry; Seoul National University; Seoul Republic of Korea
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Ihm JJ, Seo DG. Does Reflective Learning with Feedback Improve Dental Students' Self-Perceived Competence in Clinical Preparedness? J Dent Educ 2016; 80:173-182. [PMID: 26834135] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The value of dental students' self-assessment is often debated. The aim of this study was to explore whether reflective learning with feedback enabled dental students to more accurately assess their self-perceived levels of preparedness on dental competencies. Over 16 weeks, all third- and fourth-year students at a dental school in the Republic of Korea took part in clinical rotations that incorporated reflective learning and feedback. Following this educational intervention, they were asked to assess their perceptions of their clinical competence. The results showed that the students reported feeling most confident about performing periodontal treatment (mean 7.1 on a ten-point scale) and least confident about providing orthodontic care (mean 5.6). The fourth-year students reported feeling more confident on all the competencies than the third-year students. Their self-perceived competence in periodontal treatment and oral medicine significantly predicted the instructors' clinical evaluations. This study offered insights into determining if structured reflective learning with effective feedback helps to increase dental students' self-perceived level of clinical preparedness.
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Affiliation(s)
- Jung-Joon Ihm
- Dr. Ihm is BK21 Assistant Professor, Office of Dental Education, School of Dentistry, Seoul National University, Seoul, Republic of Korea; Dr. Seo is Associate Professor, Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Deog-Gyu Seo
- Dr. Ihm is BK21 Assistant Professor, Office of Dental Education, School of Dentistry, Seoul National University, Seoul, Republic of Korea; Dr. Seo is Associate Professor, Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea.
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Lee Y, An SY, Park YJ, Yu FH, Park JC, Seo DG. Cytotoxic effects of one-step self-etching adhesives on an odontoblast cell line. Scanning 2016; 38:36-42. [PMID: 26186405 DOI: 10.1002/sca.21236] [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] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/09/2015] [Accepted: 06/11/2015] [Indexed: 06/04/2023]
Abstract
The aim of this study was to evaluate the cytotoxic effects of one-step self-etching adhesives. Cells from an immortalized mouse odontoblast cell line (MDPC-23) were cultured with six different dental adhesive systems (diluted to concentrations of 0.5% for 4 h): Adper Easy Bond (EB), Xeno V (XV), iBond (IB), AdheSE One (AO), Clearfil SE primer (CS), and Adper Single Bond 2 (SB). MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) and flow cytometric apoptosis assays were used to evaluate cell viability and the rate of apoptosis. The odontoblasts were also examined under a scanning electron microscope. While all of the cultures with adhesives showed reduced viability, the viabilities in the IB and SB groups were not significantly different from the control group. Although increased apoptosis rates were observed in all of the cultures with adhesives, the rate in the SB group was not significantly different from the rate in the control. The control group showed the lowest apoptosis rate followed by the SB, AO, IB, EB, XV, and CS groups. When examined under a scanning electron microscope, control odontoblasts and the SB group exhibited relatively large cytoplasmic extensions. In contrast, in the EB and CS groups, fewer fibroblasts remained adhered to the plate surface. Cytoplasmic membrane shrinkage and cell-free areas with residual membrane fragments from dead cells were observed. In conclusion, all cultures with one-step self-etching adhesives showed increased apoptotic activity. SB, an etch-and-rinse adhesive, was comparable to the control group, and CS and EB showed the lowest odontoblast viabilities according to the MTT assay.
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Affiliation(s)
- Yoon Lee
- Department of Conservative Dentistry, Wonju Severance Christian Hospital, Wonju College of Medicine, Yonsei University, Wonju, Republic of Korea
| | - So-Youn An
- Department of Pediatric Dentistry, College of Dentistry, Wonkwang University, Iksan, Republic of Korea
| | - Yoon-Jung Park
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul, Republic of Korea
| | - Frank H Yu
- Program in Neurobiology, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Joo-Cheol Park
- Department of Oral Histology-Developmental Biology, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
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Kim RJY, Son SA, Hwang JY, Lee IB, Seo DG. Comparison of photopolymerization temperature increases in internal and external positions of composite and tooth cavities in real time: Incremental fillings of microhybrid composite vs. bulk filling of bulk fill composite. J Dent 2015; 43:1093-1098. [DOI: 10.1016/j.jdent.2015.07.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Revised: 06/24/2015] [Accepted: 07/01/2015] [Indexed: 10/23/2022] Open
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Kim RJY, Yi A, Eo SH, Lee IB, Seo DG. Temperature changes in bulk-fill resin composite during photopolymerization. Am J Dent 2015; 28:241-244. [PMID: 26437507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
PURPOSE To investigate the temperature changes at multiple sites within bulk-fill resin composites and in the pulp chamber during photopolymerization in the tooth cavity. METHODS Class 1 cavities (n = 5) prepared in extracted third molars were filled with SureFil SDR Flow, a newly developed bulk-fill composite. After securing the specimens in a water bath at 36.5 degrees C, eight thermocouples were used to measure the temperature at the bottom center (BC), middle center (MC), top center (TC), bottom edge (BE), middle edge (ME), and top edge (TE) of the restoration; the pulpal aspect of the dentin (PD); and the center of the curing light tip (CL) during photopolymerization. RESULTS The maximum temperature values (degrees C) differed among the measurement sites. TC exhibited the greatest temperature increase (72.3 ± 2.4), followed by MC, BC, TE, TE, ME, CL, and BE. The lowest temperature was observed at PD (41.1 ± 1.9). The peak temperatures within the composite were observed during the early stage of light-curing, while CL and PD exhibited the highest temperature at the end stage of light-curing.
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Kim SY, Kim KJ, Yi YA, Seo DG. Quantitative microleakage analysis of root canal filling materials in single-rooted canals. Scanning 2015; 37:237-245. [PMID: 25782594 DOI: 10.1002/sca.21204] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Accepted: 02/24/2015] [Indexed: 06/04/2023]
Abstract
The purpose of this study was to analyze the sealing ability of different root canal filling materials over a 6-week period using a glucose penetration model. Forty-six recently extracted human premolars were used in this study. The root canals were enlarged to 40/0.06. Prepared canals were randomly assigned into four groups (n = 10) as follows: Group 1, Gutta-Percha (GP)/AH Plus with cold lateral compaction; Group 2, GP/AH Plus with continuous wave compaction; Group 3, RealSeal SE obturation system; and Group 4, OrthoMTA. The remaining specimens were used as positive and negative controls, and all specimens underwent thermocycling (10,000; 5-55 °C). The sealing ability of all samples was evaluated at 24 h, 1, 2, 4, and 6 weeks using a quantitative glucose leakage model, and scanning electron microscope (SEM) images were taken. A mixed effect analysis using R statistical language was performed. Groups 1, 2, and 4 showed low leakage levels during experimental periods. Group 3 showed low leakage levels for the first 2 weeks; however, the leakage level was significantly increased after 2 weeks compared to negative control group (p < 0.05). In the SEM results, Group 3 showed imperfect dentin bonding, whereas Group 4 showed calcium silicate hydrate short tags, which are formed at the access of the dentin tubules. GP/AH Plus and OrthoMTA showed less microleakage than RealSeal SE obturation system when used as root canal filling materials. Traditional GP/AH Plus sealer and the newly developed OrthoMTA are more appropriate for ideal sealing of the root canals.
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Affiliation(s)
- Sin-Young Kim
- Department of Conservative Dentistry, Seoul St. Mary's Dental Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Kyung-Jae Kim
- Department of Conservative Dentistry, Seoul St. Mary's Dental Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Young-Ah Yi
- Department of Dentistry, Inje University Seoul Paik Hospital, Seoul, Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
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Kim RJY, Woo JS, Lee IB, Yi YA, Hwang JY, Seo DG. Performance of universal adhesives on bonding to leucite-reinforced ceramic. Biomater Res 2015; 19:11. [PMID: 26331081 PMCID: PMC4552369 DOI: 10.1186/s40824-015-0035-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [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: 01/10/2015] [Accepted: 04/13/2015] [Indexed: 11/10/2022] Open
Abstract
Background This study aimed to investigate the microshear bond strength of universal bonding adhesives to leucite-reinforced glass-ceramic. Methods Leucite-reinforced glass-ceramic blocks were polished and etched with 9.5% hydrofluoric acid for 1 min. The specimens were assigned to one of four groups based on their surface conditioning (n = 16): 1) NC: negative control with no further treatment; 2) SBU: Single Bond Universal (3M ESPE); 3) ABU: ALL-BOND Universal (Bisco); and 4) PC: RelyX Ceramic Primer and Adper Scotchbond Multi-Purpose Adhesive (3M ESPE) as a positive control. RelyX Ultimate resin cement (3M ESPE) was placed on the pretreated ceramic and was light cured. Eight specimens from each group were stored in water for 24 h, and the remaining eight specimens were thermocycled 10,000 times prior to microshear bond strength evaluation. The fractured surfaces were examined by stereomicroscopy and scanning electron microscopy (SEM). Results After water storage and thermocycling, the microshear bond strength values decreased in the order of PC > SBU and ABU > NC (P < 0.05). Thermocycling significantly reduced the microshear bond strength, regardless of the surface conditioning used (P < 0.05). Cohesive failure in the ceramic and mixed failure in the ceramic and resin cement were observed in the fractured specimens. The percentage of specimens with cohesive failure after 24 h of water storage was: NC (50%), SBU (75%), ABU (75%), and PC (87%). After thermocycling, the percentage of cohesive failure in NC decreased to 25%; however, yet the percentages of the other groups remained the same. Conclusions Although the bond strength between resin and hydrofluoric acid-etched glass ceramic was improved when universal adhesives were used, conventional surface conditioning using a separate silane and adhesive is preferable to a simplified procedure that uses only a universal adhesive for cementation of leucite-reinforced glass-ceramic.
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Affiliation(s)
- Ryan Jin-Young Kim
- Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, Korea
| | - Jung-Soo Woo
- Dental Research Institute and School of Dentistry, Seoul National University, Seoul, Korea
| | - In-Bog Lee
- Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, Korea
| | - Young-Ah Yi
- Department of Dentistry, Inje University Seoul Paik Hospital, Seoul, Korea
| | - Ji-Yun Hwang
- Nutrition Education Major, Graduate School of Education, Sangmyung University, Seoul, Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, Korea
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Han JH, Kim HM, Seo DG, Lee G, Jeung EB, Yu FH. Multiple transcripts of anoctamin genes expressed in the mouse submandibular salivary gland. J Periodontal Implant Sci 2015; 45:69-75. [PMID: 25932341 PMCID: PMC4415004 DOI: 10.5051/jpis.2015.45.2.69] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 04/20/2015] [Indexed: 12/13/2022] Open
Affiliation(s)
- Ji-Hye Han
- Program in Neurobiology, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Hye-Mi Kim
- Program in Neurobiology, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, Seoul National University School of Dentistry, Seoul, Korea
| | - Gene Lee
- Department of Oral Biochemistry, Seoul National University School of Dentistry, Seoul, Korea
| | - Eui-Bae Jeung
- Laboratory of Veterinary Biochemistry and Molecular Biology, Chungbuk National University College of Veterinary Medicine, Cheongju, Korea
| | - Frank H Yu
- Program in Neurobiology, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
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Kim JH, Cho BH, Lee JH, Kwon SJ, Yi YA, Shin Y, Roh BD, Seo DG. Influence of preparation design on fit and ceramic thickness of CEREC 3 partial ceramic crowns after cementation. Acta Odontol Scand 2015; 73:107-13. [PMID: 25299600 DOI: 10.3109/00016357.2014.956145] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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] [Indexed: 11/13/2022]
Abstract
OBJECTIVE This study investigated the influence of preparation design on the marginal and internal gap and ceramic thickness of partial ceramic crowns (PCCs) fabricated with the CEREC 3 system. MATERIALS AND METHODS Sixteen extracted human mandibular molars were prepared according to two different preparation designs (n = 8): a retentive preparation design with traditional cusp capping (Group I) and a non-retentive preparation design with horizontal reduction of cusps (Group II). PCCs were fabricated from IPS Empress CAD with the CEREC 3 system. The parameters for luting space and minimum occlusal ceramic thickness were set to 30 μm and 1.5 mm, respectively. The fabricated PCCs were cemented to their corresponding teeth with self-adhesive resin cement and were then scanned by micro-computed tomography. The marginal and internal gaps were measured at pre-determined measuring points in five bucco-lingual and three mesio-distal cross-sectional images. The ceramic thicknesses of the PCCs were measured at the measuring points for cusp capping areas. RESULTS Group II (167.4 ± 76.4 μm) had a smaller overall mean gap, which included the marginal and internal gap measurements, than that of Group I (184.8 ± 89.0 μm). The internal gaps were larger than the marginal gaps, regardless of preparation design. Group I presented a thinner ceramic thickness in the cusp capping areas than the minimum occlusal ceramic thickness parameter of 1.5 mm. CONCLUSION. Preparation design had an influence on fit, particularly the internal gap of the PCCs. Ceramic thickness could be thinner than the minimum ceramic thickness parameter.
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Affiliation(s)
- Jae-Hoon Kim
- Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University , Seoul , Republic of Korea
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Abstract
OBJECTIVE The purpose of this study was to compare the cytotoxicity of four denture adhesives on human gingival fibroblast cells. MATERIALS AND METHODS Immortalized human gingival fibroblasts were cultured with one of four different denture adhesives, Polident, Protefix, Staydent or Denfix-A, which was placed in insert dishes (10% w/v concentration) for 48 h. The MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay and flow cytometric apoptosis assay were used to evaluate cell viability and apoptosis rates. The fibroblasts were also examined under a scanning electron microscope. RESULTS The MTT assay showed that all denture adhesives resulted in a significantly lower cell viability compared to the control cells propagated in normal culture medium (p < 0.05), with Staydent demonstrating the lowest cell viability. According to the flow cytometric apoptosis assay, Staydent and Protefix showed significantly higher apoptosis rates than the control group (p < 0.05), whereas Polident and Denfix-A did not demonstrate any significant differences (p > 0.05). Staydent showed the highest apoptosis rate. Scanning electron microscopy showed that the cells of the Staydent group underwent cytoplasmic membrane shrinkage, with cell free areas containing residual fragments of the membrane of dead cells. CONCLUSIONS The four denture adhesives evaluated in this study imparted cytotoxic effects on human gingival fibroblast cells. Staydent showed the highest toxicity.
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Affiliation(s)
- Yoon Lee
- Department of Conservative Dentistry, Wonju Severance Christian Hospital, Yonsei University , Wonju , Republic of Korea
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Kim SY, Ahn JS, Yi YA, Lee Y, Hwang JY, Seo DG. Quantitative microleakage analysis of endodontic temporary filling materials using a glucose penetration model. Acta Odontol Scand 2015; 73:137-43. [PMID: 25252594 DOI: 10.3109/00016357.2014.961028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [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] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The purpose of this study was to analyze the sealing ability of different temporary endodontic materials over a 6-week period using a glucose penetration model. MATERIALS AND METHODS Standardized holes were formed on 48 dentin discs from human premolars. The thicknesses of the specimens were distributed evenly to 2 mm, 3 mm and 4 mm. Prepared dentin specimens were randomly assigned into six groups (n = 7) and the holes in the dentin specimens were filled with two kinds of temporary filling materials as per the manufacturers' instructions as follows: Caviton (GC Corporation, Tokyo, Japan) 2 mm, 3 mm, 4 mm and IRM (Dentsply International Inc., Milford, DE) 2 mm, 3 mm, 4 mm. The remaining specimens were used as positive and negative controls and all specimens underwent thermocycling (1000; 5-55°C). The sealing ability of all samples was evaluated using the leakage model for glucose. The samples were analyzed by a spectrophotometer in quantitative glucose microleakage test over a period of 6 weeks. As a statistical inference, a mixed effect analysis was applied to analyze serial measurements over time. RESULTS The Caviton groups showed less glucose penetration in comparison with the IRM groups. The Caviton 4 mm group demonstrated relatively low glucose leakage over the test period. High glucose leakage was detected throughout the test period in all IRM groups. The glucose leakage level increased after 1 week in the Caviton 2 mm group and after 4 weeks in the Caviton 3 mm and 4 mm groups (p < 0.05). CONCLUSIONS Caviton had better sealing ability than IRM in the glucose penetration model during 6 weeks. Temporary filling of Caviton to at least 3 mm in thickness is necessary and temporary filling periods should not exceed 4 weeks.
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Affiliation(s)
- Sin-Young Kim
- Department of Conservative Dentistry, Seoul St. Mary's Dental Hospital, College of Medicine, The Catholic University of Korea , Seoul , Korea
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Kim MJ, Park KP, Seo DG, Ihm JJ. [The relationship between dental graduate students' MBTI types and academic achievement in problem-based learning]. Korean J Med Educ 2014; 26:291-297. [PMID: 25800236 PMCID: PMC8813437 DOI: 10.3946/kjme.2014.26.4.291] [Citation(s) in RCA: 3] [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] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Revised: 10/10/2014] [Accepted: 10/29/2014] [Indexed: 06/02/2023]
Abstract
PURPOSE The study aimed to determine the personality types of the graduate students in Seoul National University School of Dentistry (SNU SD) and analyze the specific personal types that were linked to their performance in problem-based learning (PBL). METHODS A total of 263 graduate students in SNU SD from 2011 to 2013, participated in PBL and completed the Myers-Briggs Type Indicator (MBTI) GS form, which was analyzed statistically to determine whether their MBTI personality types were independent of their PBL performance. In particular, MBTI types were regressed on evaluation subcategories, including tutor evaluation and oral test. RESULTS ESTJ (20.9%) and ISTJ (18.6%) were the most common MBTI personality types in dental graduate students. Compared with males, female students performed significantly better on the PBL. Judging was the most notable type in PBL performance, with its J-P index being statistically significant. CONCLUSION PBL is implemented, based on the perspective of student-centered education. Accordingly, the types of personality that usually matriculate in dental school should be monitored, and a student-centered approach to dental education should be adopted.
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Affiliation(s)
| | | | - Deog-Gyu Seo
- Corresponding Author: Deog-Gyu Seo (http://orcid.org/0000-0002-0160-6317) Department of Conservative Dentistry and Dental Research Institute, Seoul National University School of Dentistry, 101 Daehak-ro, Jongno-gu, Seoul 110-749, Korea Tel: +82.2.2072.7686 Fax: +82.2.2072.3859
| | - Jung-Joon Ihm
- Corresponding Author: Jung-Joon Ihm (http://orcid.org/0000-0002-3136-5956) Office of Dental Education, Seoul National University School of Dentistry, 101 Daehak-ro, Jongno-gu, Seoul 110-744, Korea Tel: +82.2.740.8776 Fax: +82.2.742.8774
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Seo JY, Park YJ, Yi YA, Hwang JY, Lee IB, Cho BH, Son HH, Seo DG. Epigenetics: general characteristics and implications for oral health. Restor Dent Endod 2014; 40:14-22. [PMID: 25671208 PMCID: PMC4320272 DOI: 10.5395/rde.2015.40.1.14] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [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: 04/11/2014] [Accepted: 09/11/2014] [Indexed: 01/08/2023] Open
Abstract
Genetic information such as DNA sequences has been limited to fully explain mechanisms of gene regulation and disease process. Epigenetic mechanisms, which include DNA methylation, histone modification and non-coding RNAs, can regulate gene expression and affect progression of disease. Although studies focused on epigenetics are being actively investigated in the field of medicine and biology, epigenetics in dental research is at the early stages. However, studies on epigenetics in dentistry deserve attention because epigenetic mechanisms play important roles in gene expression during tooth development and may affect oral diseases. In addition, understanding of epigenetic alteration is important for developing new therapeutic methods. This review article aims to outline the general features of epigenetic mechanisms and describe its future implications in the field of dentistry.
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Affiliation(s)
- Ji-Yun Seo
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Yoon-Jung Park
- Department of Nutritional Science and Food Management, Ewha Womans University, Seoul, Korea
| | - Young-Ah Yi
- Department of Dentistry, Inje University Seoul Paik Hospital, Seoul, Korea
| | - Ji-Yun Hwang
- Nutrition Education Major, Graduate School of Education, Sangmyung University, Seoul, Korea
| | - In-Bog Lee
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Byeong-Hoon Cho
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Ho-Hyun Son
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
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Han GJ, Kim JH, Chung SN, Chun BH, Kim CK, Seo DG, Son HH, Cho BH. Effects of non-thermal atmospheric pressure pulsed plasma on the adhesion and durability of resin composite to dentin. Eur J Oral Sci 2014; 122:417-23. [DOI: 10.1111/eos.12153] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Geum-Jun Han
- Department of Dental Biomaterials Science; Seoul National University School of Dentistry & Dental Research Institute; Seoul Korea
| | - Jae-Hoon Kim
- Department of Conservative Dentistry; Seoul National University School of Dentistry & Dental Research Institute; Seoul Korea
| | | | | | - Chang-Keun Kim
- School of Chemical Engineering and Materials Science; Chung-Ang University; Seoul Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry; Seoul National University School of Dentistry & Dental Research Institute; Seoul Korea
| | - Ho-Hyun Son
- Department of Conservative Dentistry; Seoul National University School of Dentistry & Dental Research Institute; Seoul Korea
| | - Byeong-Hoon Cho
- Department of Conservative Dentistry; Seoul National University School of Dentistry & Dental Research Institute; Seoul Korea
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Shin YJ, Shin Y, Yi YA, Kim J, Lee IB, Cho BH, Son HH, Seo DG. Evaluation of the shear bond strength of resin cement to Y-TZP ceramic after different surface treatments. Scanning 2014; 36:479-486. [PMID: 24676632 DOI: 10.1002/sca.21142] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [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: 11/17/2013] [Accepted: 02/24/2014] [Indexed: 06/03/2023]
Abstract
The purpose of this study was to evaluate the effect of various surface treatments on the shear bond strength of Y-TZP (Yttria-Tetragonal Zirconia Polycrystal) ceramics with zirconia primer and two different resin cements both containing 10-methacryloyloxydecyl dihydrogen phosphate (MDP). Zirconia blocks (LAVA, 3M ESPE, St. Paul, MN) were polished and assigned to five groups according to the surface treatment: (1) no further treatment (control); (2) airborne abrasion with Al2 O3 particles; (3) Z-PRIME Plus (Bisco, Schaumburg, IL) applied on polished zirconia; (4) Z-PRIME Plus applied on zirconia after airborne abrasion; and (5) tribochemical silica-coating performed with the CoJet system (3M ESPE) followed by application of ESPE®-Sil (3M ESPE). Each group was further divided into one of two resin cements: Panavia F2.0 (Kuraray, Kurashiki, Okayama, Japan) and Clearfil SA Luting (Kuraray). Resin cement placed inside a gel-cap was polymerized on the zirconia surface. Shear bond strength was tested with a universal testing machine at 0.5 mm/min. One-way analysis of variance and paired t-test were done. (p < 0.05), and scanning electron microscope (SEM) images were taken. Zirconia primer applied after airborne abrasion significantly increased the shear bond strength resulting in the highest value for both resin cements. Control groups for both cements showed the weakest value for shear bond strength. No significant differences were found between the shear bond strengths of the individual resin cements applied to zirconia surfaces treated the same way. In conclusion, the combined surface treatment of airborne abrasion followed by a zirconia primer is recommended for zirconia bonding with Panavia F2.0 and Clearfil SA Luting cements.
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Affiliation(s)
- Yoo-Jin Shin
- Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea
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Koo SM, Seo DG, Park YJ, Hwang JY. Association between consumption of milk and dairy products, calcium and riboflavin, and periodontitis in Korean adults: Using the 2007-2010 Korea National Health and Nutrition Examination Surveys. ACTA ACUST UNITED AC 2014. [DOI: 10.4163/jnh.2014.47.4.258] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Sang Mi Koo
- Graduate School of Clinical Health Sciences, Ewha Womans University, Seoul 120-750, Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, Dental Research Institute, School of Dentistry, Seoul National University, Seoul 110-768, Korea
| | - Yoon Jung Park
- Department of Nutritional Science & Food Management, College of Health Science, Ewha Womans University, Seoul 120-750, Korea
| | - Ji-Yun Hwang
- Nutrition Education Major, Graduate School of Education, Sangmyung University, Seoul 110-743, Korea
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Hong SW, Baik JE, Kang SS, Yun CH, Seo DG, Han SH. Lipoteichoic acid of Streptococcus mutans interacts with Toll-like receptor 2 through the lipid moiety for induction of inflammatory mediators in murine macrophages. Mol Immunol 2013; 57:284-91. [PMID: 24216318 DOI: 10.1016/j.molimm.2013.10.004] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [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: 12/05/2012] [Revised: 10/07/2013] [Accepted: 10/09/2013] [Indexed: 11/26/2022]
Abstract
Streptococcus mutans is a pathogenic Gram-positive bacterium that is closely associated with dental caries and subsequent pulpal inflammation. Although lipoteichoic acid (LTA) is considered a major virulence factor of Gram-positive bacteria, little is known about the innate immunity to S. mutans LTA. In this study, we purified LTA from S. mutans (Sm.LTA) through n-butanol extraction, hydrophobic interaction column chromatography, and ion-exchange column chromatography to investigate its immunological properties using murine macrophages. The Sm.LTA preparation had no detectable contamination with endotoxins, proteins, or nucleic acids. Upon exposure to Sm.LTA, the murine macrophage cell-line RAW 264.7 cells produced TNF-α and nitric oxide (NO) in a dose-dependent manner. Sm.LTA preferentially bound to and activated CHO/CD14/TLR2 cells rather than CHO/CD14/TLR4 cells, which are stable transfectants expressing CD14 and TLR2 or CD14 and TLR4, respectively. Sm.LTA could not induce TNF-α or NO production in macrophages derived from TLR2-deficient mice whereas it dose-dependently induced those inflammatory mediators in wild-type macrophages. TLR2-dependent induction of NO by Sm.LTA was also confirmed in RAW 264.7 cells using specific antibodies blocking TLR2. Furthermore, Sm.LTA deacylated by alkaline hydrolysis neither stimulated TLR2 nor induced TNF-α or NO production, suggesting that Sm.LTA lipid moieties are crucial for the immuno-stimulatory activity of Sm.LTA. Unlike Staphylococcus aureus LTA, which has potent immuno-stimulating activity, Sm.LTA showed a modest induction of NO production comparable to LTAs of other oral bacteria Enterococcus faecalis and Lactobacillus plantarum. In conclusion, our results suggest that the Sm.LTA interacts with TLR2 through the lipid moiety for the induction of inflammatory mediators in macrophages.
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Affiliation(s)
- Sun Woong Hong
- Department of Oral Microbiology and Immunology, DRI, and BK21 Program, School of Dentistry, Seoul National University, Seoul 110-749, Republic of Korea
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Cho SY, Seo DG, Lee SJ, Lee J, Lee SJ, Jung IY. Prognostic factors for clinical outcomes according to time after direct pulp capping. J Endod 2013; 39:327-31. [PMID: 23402502 DOI: 10.1016/j.joen.2012.11.034] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 11/15/2012] [Accepted: 11/15/2012] [Indexed: 11/15/2022]
Abstract
INTRODUCTION Direct pulp capping is a treatment option for teeth with carious-exposed pulp. Because pulp capping studies have exhibited fluctuations in success rates according to different follow-up times, investigating the clinical pulpal survival rate and the potential factors contributing to the survival with respect to time is necessary. METHODS A total of 175 patients treated between November 2007 and August 2010 met the inclusion criteria. During the follow-up, we investigated 7 clinical variables with respect to the survival of the pulp capping treatment: sex, age, maxilla versus mandible, tooth position, capping materials, temporary filling materials, and exposure site. Survival analysis was performed using the Kaplan-Meier method and the Cox proportional hazard regression model. RESULTS The Kaplan-Meier survival curves and log-rank tests revealed that only age, exposure site, and capping material had significant effects on the pulpal survival rate (P< .05). A Cox regression model showed that mineral trioxide aggregate was the sole factor affecting the survival of the treated pulps (P< .05). In the analyses performed separately according to time, there was no conspicuous factor that affected the survival rate before 100 days. However, after 100 days, the type of pulp capping material was the single most important factor influencing the survival rate (P< .05). CONCLUSIONS The results of this study indicated that careful patient selection and the type of pulp capping material should be taken into consideration when performing a pulp capping treatment.
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Affiliation(s)
- Sin-Yeon Cho
- Department of Conservative Dentistry and Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea
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Kwon SJ, Park YJ, Jun SH, Ahn JS, Lee IB, Cho BH, Son HH, Seo DG. Thermal irritation of teeth during dental treatment procedures. Restor Dent Endod 2013; 38:105-12. [PMID: 24010075 PMCID: PMC3761117 DOI: 10.5395/rde.2013.38.3.105] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 05/09/2013] [Accepted: 05/14/2013] [Indexed: 11/11/2022] Open
Abstract
While it is reasonably well known that certain dental procedures increase the temperature of the tooth's surface, of greater interest is their potential damaging effect on the pulp and tooth-supporting tissues. Previous studies have investigated the responses of the pulp, periodontal ligament, and alveolar bone to thermal irritation and the temperature at which thermal damage is initiated. There are also many in vitro studies that have measured the temperature increase of the pulp and tooth-supporting tissues during restorative and endodontic procedures. This review article provides an overview of studies measuring temperature increases in tooth structures during several restorative and endodontic procedures, and proposes clinical guidelines for reducing potential thermal hazards to the pulp and supporting tissues.
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Affiliation(s)
- Su-Jung Kwon
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Yoon-Jung Park
- Department of Nutritional Science and Food Management, Ewha Womans University Health Science College, Seoul, Korea
| | - Sang-Ho Jun
- Department of Oral and Maxillofacial Surgery, Korea University Anam Hospital, Seoul, Korea
| | - Jin-Soo Ahn
- Department of Dental Biomaterials Science, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - In-Bog Lee
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Byeong-Hoon Cho
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Ho-Hyun Son
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, Seoul National University School of Dentistry and Dental Research Institute, Seoul, Korea
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Kim MJ, Oh SH, Kim JH, Ju SW, Seo DG, Jun SH, Ahn JS, Ryu JJ. Wear evaluation of the human enamel opposing different Y-TZP dental ceramics and other porcelains. J Dent 2012; 40:979-88. [DOI: 10.1016/j.jdent.2012.08.004] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 07/30/2012] [Accepted: 08/04/2012] [Indexed: 10/28/2022] Open
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Lee IB, Min SH, Seo DG. A new method to measure the polymerization shrinkage kinetics of composites using a particle tracking method with computer vision. Dent Mater 2012; 28:212-8. [DOI: 10.1016/j.dental.2011.10.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2010] [Accepted: 10/04/2011] [Indexed: 10/15/2022]
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Seo DG, Yi YA, Shin SJ, Park JW. Analysis of factors associated with cracked teeth. J Endod 2012; 38:288-92. [PMID: 22341061 DOI: 10.1016/j.joen.2011.11.017] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 11/19/2011] [Accepted: 11/27/2011] [Indexed: 10/14/2022]
Abstract
INTRODUCTION The purpose of this study was to analyze the characteristics, distribution, and associated factors of longitudinal fractured teeth according to the well-defined criteria of the American Association of Endodontists (AAE). METHODS One hundred seven teeth with longitudinal fracture from 103 patients were diagnosed and analyzed. The patients' signs, symptoms, age, and sex were noted as well as the tooth number, dental arch, filling materials, size/classification of restoration, crack direction, pulp vitality, whether the patient had undergone endodontic treatment, bite test results, percussion test results, wear facet, and periodontal pocket depth. RESULTS Eighty-seven teeth were diagnosed with a cracked tooth (81.3%), 14 were diagnosed with vertical root fracture (VRF, 13.1%), 4 had a split tooth (3.7%), and 2 had a fractured cusp (1.9%); 82.2% showed a sensitive reaction on the bite test. Longitudinal tooth fractures were observed most frequently in patient in their 40s. The upper first molar (28.0%) was most frequently cracked, followed by the lower first molar (25.2%), the lower second molar (20.6%), and the upper second molar (16.8%). Most longitudinal tooth fractures (72.0%) occurred mainly in restored teeth, whereas only 28.0% were found in intact teeth. Compared with resin (4.7%) or porcelain (0.9%), the use of nonbonded inlay restoration materials such as gold (20.5%) or amalgam (18.7%) increased the occurrence of longitudinal tooth fractures. Out of 107 of longitudinal fractured teeth, 33 (30.8%) were treated endodontically and 74 (69.2%) were not. VRF was associated with endodontic treatment. CONCLUSIONS The bite test is most reliable for reproducing symptoms. The combined use of various examination methods is recommended for detecting cracks and minutely inspecting all directions of a tooth.
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Affiliation(s)
- Deog-Gyu Seo
- Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
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Chang SW, Baek SH, Yang HC, Seo DG, Hong ST, Han SH, Lee Y, Gu Y, Kwon HB, Lee W, Bae KS, Kum KY. Heavy Metal Analysis of Ortho MTA and ProRoot MTA. J Endod 2011; 37:1673-6. [DOI: 10.1016/j.joen.2011.08.020] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Revised: 08/22/2011] [Accepted: 08/30/2011] [Indexed: 10/17/2022]
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Choi S, Baik JE, Jeon JH, Cho K, Seo DG, Kum KY, Yun CH, Han SH. Identification of Porphyromonas gingivalis lipopolysaccharide-binding proteins in human saliva. Mol Immunol 2011; 48:2207-13. [DOI: 10.1016/j.molimm.2011.06.434] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Revised: 06/09/2011] [Accepted: 06/10/2011] [Indexed: 01/22/2023]
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Lee IB, Min SH, Seo DG, Kim SY, Kwon Y. A new method to measure the linear polymerization shrinkage of composites using a particle tracking method with computer vision. ACTA ACUST UNITED AC 2010. [DOI: 10.5395/jkacd.2010.35.3.180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- In-Bog Lee
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Korea
| | - Sun-Hong Min
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Korea
| | - Deog-Gyu Seo
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Korea
| | - Sun-Young Kim
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Korea
| | - Youngchul Kwon
- Department of Conservative Dentistry, School of Dentistry, Seoul National University, Seoul, Korea
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Abstract
Clinical Relevance
This paper presents a comprehensive and systemic approach for determining the etiology of patients with xerostomia and the rapidly progressing potential systemic diseases that can result. Dentists must be reminded of their role in the early diagnosis and treatment of some systemic diseases, because the oral environment may show early symptoms that are relatively easy to detect.
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Affiliation(s)
- Deog-Gyu Seo
- Department of Conservative Dentistry, Yonsei University, Seoul, Korea
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Seo DG, Roh BD. The comparison of relative reliability on biaxial and three point flexural strength testing methods of light curing composite resin. ACTA ACUST UNITED AC 2006. [DOI: 10.5395/jkacd.2006.31.1.058] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Deog-Gyu Seo
- Department of Conservative Dentistry, College of Dentistry, Yonsei University, Korea
| | - Byoung-Duck Roh
- Department of Conservative Dentistry, College of Dentistry, Yonsei University, Korea
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