1
|
Marques JV, Carlos NR, Turssi CP, França FMG, Vieira Junior WF, Basting RT. Effectiveness of changing the color of darker teeth is potentiated by association with violet LED light. Photodiagnosis Photodyn Ther 2023; 44:103794. [PMID: 37699468 DOI: 10.1016/j.pdpdt.2023.103794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/17/2023] [Accepted: 09/07/2023] [Indexed: 09/14/2023]
Abstract
BACKGROUND The effectiveness of in-office bleaching protocols performed with violet LED light either combined with a bleaching agent containing 37% carbamide peroxide, or not, was determined by comparing teeth with different degrees of darkening. METHODOLOGY Eighty bovine incisors were separated into groups of "light" teeth (luminosity greater than or equal to B3) and "dark" teeth (less than or equal to A3.5) to receive the protocols: HP - 35% hydrogen peroxide (Whiteness HP), CP - 37% carbamide peroxide (Whiteness SuperEndo), LED - violet LED light (Bright Max Whitening), CPLED - CP associated with the LED. For color analysis the CIEL*a*b* e WID, ΔEab, ΔE00 e ΔWID parameters were used. Data were analyzed using Mann-Whitney, Kruskal-Wallis, Dunn, Friedman or Nemenyi tests (α = 5%). RESULTS HP and CP resulted in similar color change values (ΔEab, ΔE00 e ΔWID) for light and dark teeth (p > 0.05). Dark teeth showed better bleaching effectiveness (ΔEab, ΔE00 e ΔWID) than light teeth when CPLED was used (p < 0.05). LED showed color change that were below the limits of acceptability and perceptibility for ΔWID. CONCLUSION light teeth are effectively bleached with the use of HP or CP, whereas dark teeth respond better to treatment with the CPLED protocol. Violet LED used alone did not show a satisfactory result.
Collapse
Affiliation(s)
- Joana Vasconcellos Marques
- Faculdade São Leopoldo Mandic, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil
| | - Natália Russo Carlos
- Faculdade São Leopoldo Mandic, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil
| | - Cecilia Pedroso Turssi
- Faculdade São Leopoldo Mandic, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil
| | | | | | - Roberta Tarkany Basting
- Faculdade São Leopoldo Mandic, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil.
| |
Collapse
|
2
|
Ishizuka H, Hamba H, Nakamura K, Miyayoshi Y, Kumura H, Muramatsu T. Effects of bovine milk osteopontin on in vitro enamel remineralization as a topical application prior to immersion in remineralizing solutions with/without fluoride. Dent Mater J 2023; 42:140-146. [PMID: 36450454 DOI: 10.4012/dmj.2022-140] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
The aim of the present study was to investigate the effects of bovine milk osteopontin (OPN) on enamel remineralization as a topical application prior to immersion in remineralizing solutions with/without fluoride. Bovine enamel blocks were demineralized then were divided into the following 3 groups: OPN (2.7 and 5.4 µM) solutions and deionized water (control). Each group was divided into 2 groups (remineralizing solution with or without 1 ppm of fluoride (F)). The specimens were analyzed by micro-CT and scanning electron microscope (SEM). The percentage of remineralization was higher in remineralization solution with than without F (p<0.05). The present results suggest that bovine milk OPN inhibits remineralization in solution without F, but 5.4 µM bovine milk OPN does not inhibit remineralization of the demineralized body using solution containing F by interrupting mineral deposition on the enamel surface.
Collapse
Affiliation(s)
- Hisako Ishizuka
- Department of Operative Dentistry, Cariology and Pulp Biology , Tokyo Dental College
| | - Hidenori Hamba
- Department of Operative Dentistry, Cariology and Pulp Biology , Tokyo Dental College
| | - Keiki Nakamura
- Department of Operative Dentistry, Cariology and Pulp Biology , Tokyo Dental College
| | - Yoshihito Miyayoshi
- Department of Operative Dentistry, Cariology and Pulp Biology , Tokyo Dental College
| | - Haruto Kumura
- Laboratory of Applied Food Science, Graduate School and Research Faculty of Agriculture, Hokkaido University
| | - Takashi Muramatsu
- Department of Operative Dentistry, Cariology and Pulp Biology , Tokyo Dental College
| |
Collapse
|
3
|
Tomaževič T, Drevenšek M, Kosem R. Evaluation of fluoride varnish treatment of postorthodontic white spot lesions by visual inspection and laser fluorescence-A randomized controlled study. Clin Exp Dent Res 2022; 8:931-938. [PMID: 35510617 PMCID: PMC9382033 DOI: 10.1002/cre2.579] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 03/31/2022] [Accepted: 04/03/2022] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVES White spot lesions (WSLs), as a side effect of orthodontic therapy, can be treated with fluoride varnish, with the difference in efficiency reported. MATERIAL AND METHODS Patients with buccal WSLs were consecutively included in a randomized controlled double-blind study. At first inspection and at three follow-ups over 6 months, 0.1% fluoride varnish and placebo (water) were applied in the test group (N = 21) and control group (N = 21), respectively. The maximum laser fluorescence value (LFV) of WSLs was recorded using DIAGNOdent. Between the groups, differences in the mean numbers of WSLs and the mean LFV of WSLs per patient at different time points were analyzed with mixed-design analysis of variance. Orthodontic therapy duration (OTD) was included in the model as a covariate. RESULTS A decrease in the mean WSLs number and LFV was observed; however, there were no significant differences between study groups at any time point. OTD was in interaction only with LFV. Analysis showed a different pattern of mean LFV changes for patients with OTD of >48 months compared to patients with OTD of ≤24. CONCLUSION The changes in numbers of WSLs and LFV over the study period indicated regression of WSLs, but an additional effect of FV was not confirmed.
Collapse
Affiliation(s)
- Tanja Tomaževič
- Department of Paediatric and Preventive Dentistry, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Martina Drevenšek
- Department of Orthodontics, Faculty of Medicine, University of Ljubljana, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Rok Kosem
- Department of Paediatric and Preventive Dentistry, University Medical Centre Ljubljana, Ljubljana, Slovenia
| |
Collapse
|
4
|
Fluoride-Releasing Self-Etch Adhesives Create Thick ABRZ at the Interface. BIOMED RESEARCH INTERNATIONAL 2021; 2021:9731280. [PMID: 34368356 PMCID: PMC8346310 DOI: 10.1155/2021/9731280] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 07/16/2021] [Indexed: 11/17/2022]
Abstract
A fluoride-releasing adhesive system is expected to promote mineralization of demineralized dentin/enamel around a composite restoration, thereby contributing to the longevity of the restoration. Scanning electron microscopic (SEM) and transmission electron microscopic (TEM) observations revealed the formation of an “acid–base resistant zone” (ABRZ) beneath the hybrid layer when dentin was treated with a self-etch adhesive system. A thicker ABRZ was formed from the upper slope to the end of the outer lesion, indicating greater resistance against an acid-base challenge, when a fluoride-releasing self-etch adhesive system was used. The slope formation of a fluoride-releasing adhesive is believed to be due to fluoride-release from the adhesive. Quantitative assessment of the acid resistance was performed at the interface using the region of interest (ROI) mode of a digital image analysis software package. The area of the ABRZ is influenced by the concentration of fluoride release from the adhesive resin. The threshold of fluoride concentration in the adhesive may exist to influence the morphology of the ABRZ. X-ray absorption fine structure (XAFS) analysis of the dentin treated with different concentrations of NaF-mouth rinses suggested that different fluoride concentrations result in the formation of different chemical compounds, such as fluorapatite and CaF2-like structures, on the dentin surface. This may explain the differences in μTBS values and morphological appearance of the ABRZ. NaF is effective in enhancing the enamel/dentin bond durability and also helps create a high quality of ARBZ to improve the clinical success of restorations.
Collapse
|
5
|
Nakamura K, Hamba H, Miyayoshi Y, Ishizuka H, Muramatsu T. In vitro remineralization of enamel with a solution containing casein and fluoride. Dent Mater J 2021; 40:1109-1114. [PMID: 33883330 DOI: 10.4012/dmj.2020-383] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of the present study was to investigate the effects of casein in a remineralization solution on enamel remineralization. Bovine blocks were demineralized for 21 days, then, allocated into four groups. The specimens were remineralized for 21 days in the following artificial saliva solutions: 1) 0 µg/mL casein, 0 ppm fluoride (F) (C0-F0); 2) 0 µg/mL casein, 1 ppm F (C0-F1); 3) 10 µg/mL casein, 0 ppm F (C10-F0); and 4) 10 µg/mL casein, 1 ppm F (C10-F1). Micro-CT analyses were performed once a week. Specimens were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The present results suggest that casein by itself inhibits remineralization, whereas the coexistence of casein and F promotes the remineralization of caries bodies by interrupting mineral deposition on the enamel surface.
Collapse
Affiliation(s)
- Keiki Nakamura
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College
| | - Hidenori Hamba
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College
| | - Yoshihito Miyayoshi
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College
| | - Hisako Ishizuka
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College
| | - Takashi Muramatsu
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College
| |
Collapse
|
6
|
Ogihara T, Tomiyama K, Iizuka J, Ishizawa M, Shiiya T, Mukai Y. Effects of desensitizer containing fluoroaluminocalciumsilicate glass nanoparticles on remineralization of root dentin subsurface lesions in vitro. Dent Mater J 2021; 40:1027-1032. [PMID: 33827998 DOI: 10.4012/dmj.2020-288] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We investigated the remineralization effects of Nanoseal (NS) dentin desensitizer on demineralized root dentin. Baseline lesion specimens prepared from bovine root dentin were immersed in artificial saliva (AS) or deionized water (DW) after treatment with NS or fluoride-free Nanoseal (NS(-)). Treatment and control groups comprised: 1, AS; 2, NS/AS; 3, NS(-)/AS; 4,NS/DW; 5, NS(-)/DW; and 6, baseline demineralization. Integrated mineral loss (IML) and lesion depth (LD) were determined by transverse microradiography. Fluoride concentrations in the immersion solutions were measured. AS, NS/AS and NS(-)/AS showed higher mineral volume % at the surface and lesion body than did other groups. NS/AS showed significantly lower IML than did AS. There was no significant difference in IML between NS/AS and NS(-)/AS. The highest concentration of fluoride was in the NS/AS immersion solution. The findings suggest Nanoseal facilitated remineralization of demineralized root dentin, and fluoride and other ions included may have contributed to this effect.
Collapse
Affiliation(s)
- Takashi Ogihara
- Division of Restorative Dentistry, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University
| | - Kiyoshi Tomiyama
- Division of Restorative Dentistry, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University
| | - Junko Iizuka
- Division of Restorative Dentistry, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University
| | - Masato Ishizawa
- Division of Restorative Dentistry, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University
| | - Toru Shiiya
- Division of Restorative Dentistry, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University
| | - Yoshiharu Mukai
- Division of Restorative Dentistry, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University
| |
Collapse
|
7
|
Nakamoto A, Sato T, Matsui N, Ikeda M, Nikaido T, Burrow MF, Tagami J. Effect of fluoride mouthrinse and fluoride concentration on bonding of a one-step self-etch adhesive to bovine root dentin. J Oral Sci 2019; 61:125-132. [PMID: 30918209 DOI: 10.2334/josnusd.17-0466] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
This study investigated the effect of fluoride mouthrinses on bonding of a one-step self-etch adhesive to bovine root dentin. Application of a NaF solution (0, 450, 900, or 9,000 ppm) to bovine root dentin surfaces was performed for 30 s (immediate) or before bonding of an all-in-one adhesive. Microtensile bond strength (µTBS) testing and scanning electron microscopic (SEM) observation of the acid-base resistance zone (ABRZ) were performed. µTBS values and calculated ABRZ areas were analyzed by using two-way ANOVA and the t-test with Bonferroni correction. The significance level was set at P = 0.05 (n = 30). Fracture mode was analyzed with the Mann-Whitney U test with Bonferroni correction. The significance level set at P = 0.00178 (n = 30). µTBS did not significantly differ between the control, 450 ppm F, and 900 ppm F specimens (P > 0.05) but was significantly lower in 9,000 ppm F specimens (P < 0.05). SEM showed a significant increase in acid resistance at the adhesive-dentin interface, including the ABRZ, after fluoride application.
Collapse
Affiliation(s)
- Ayako Nakamoto
- Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Takaaki Sato
- Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Naoko Matsui
- Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Masaomi Ikeda
- Oral Prosthetic Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Toru Nikaido
- Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.,Department of Operative Dentistry, Division of Oral Functional Science and Rehabilitation, School of Dentistry, Asahi University
| | | | - Junji Tagami
- Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| |
Collapse
|
8
|
Sieber K, Schmidt C, Baumann T, Lussi A, Carvalho T. Acquired Enamel Pellicle Modification with Casein and Mucin in Different Concentrations and its Impact on Initial Dental Erosion. Caries Res 2019; 53:457-466. [DOI: 10.1159/000499579] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Accepted: 03/12/2019] [Indexed: 11/19/2022] Open
Abstract
Casein and mucin have been shown to improve the erosion-protective properties of the pellicle when applied in combination. The aim of this in vitro study was to optimize the concentrations of these 2 proteins to achieve a maximum protective effect. For the 2 parts of this study, we prepared a total of 195 human enamel specimens and randomly assigned them to 13 groups, corresponding to 11 different casein-mucin concentration-combinations tested and 2 negative control groups (humid chamber). They underwent 5 cycles, consisting of pellicle formation from human whole saliva (2 h, 30°C), modification of the pellicle with casein and mucin in different concentrations (immersion in protein solutions for 2 h, 30°C), and erosion for 1 min in citric acid (0.65%, pH 3.5, 30°C). Surface microhardness (SMH), surface reflection intensity (SRI), and in the first part also calcium release were monitored during the cycling process, and analyzed with Kruskal-Wallis and post hoc Dunn’s tests. The results suggest that the best concentrations to achieve the highest erosion-protective effect are 3.0% casein and 0.81% mucin, which lead to a significant protection as measured by SMH as well as SRI compared to the unmodified pellicle. For the calcium release, no significant differences were found. This concentration combination corresponds to a general raise of the protein concentrations and a change in the molar ratio of the proteins as compared to earlier studies. Casein and mucin could now be incorporated at the determined concentration as natural ingredients in oral care products designed to protect against erosion.
Collapse
|
9
|
Bandekar S, Patil S, Dudulwar D, Moogi PP, Ghosh S, Kshirsagar S. Remineralization potential of fluoride, amorphous calcium phosphate-casein phosphopeptide, and combination of hydroxylapatite and fluoride on enamel lesions: An in vitro comparative evaluation. J Conserv Dent 2019; 22:305-309. [PMID: 31367119 PMCID: PMC6632629 DOI: 10.4103/jcd.jcd_13_19] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Aim: The purpose of this study was to evaluate and compare remineralization potential of fluoride, amorphous calcium phosphate-casein phosphopeptide (ACP-CPP), and combination of hydroxyapatite (HAP) and fluoride on enamel lesions. Materials and Methodology: Ten intact caries-free human premolars were selected. The coronal portion of each tooth was sectioned into four parts to make four enamel blocks. The baseline surface microhardness (SMH) was measured for all the enamel specimens using Vickers microhardness testing machine. The artificial carious lesion was created by immersing the specimens in demineralizing solution for 3 consecutive days at 35° The SMH of each specimen was evaluated. All the four enamel sections of each tooth were subjected to various surface treatments, i.e., Group A – Fluoride varnish, Group B – ACP-CPP, Group C – Combination of HAP and fluoride (Clinpro), and Group D – Control group; no surface treatment. A carious progress test (pH cycle) was carried out which consisted of alternative demineralization (3 h) and remineralization using artificial saliva (21 h.) for 5 consecutive days. After pH cycling, SMH readings of each specimen were again assessed to evaluate remineralization potential of each surface treatment agent. Results: Data obtained were statistically analyzed using one-way ANOVA followed by Tukey–Kramer multiple comparison test which was applied to detect significant differences between different surface treatments at different phases of studies. Conclusion: Fluoride varnish shows higher remineralization potential of early carious lesion compare to ACP-CPP and Clinpro.
Collapse
Affiliation(s)
- Siddhesh Bandekar
- Department of Conservative Dentistry and Endodontics, Yogita Dental College and Hospital, Ratnagiri, Maharashtra, India
| | - Suvarna Patil
- Department of Conservative Dentistry and Endodontics, Vasantdada Patil Dental College and Hospital, Sangli, Maharashtra, India
| | - Divya Dudulwar
- Department of Conservative Dentistry and Endodontics, D.Y. Patil Dental School, Pune, Maharashtra, India
| | - Prashant Prakash Moogi
- Department of Conservative Dentistry and Endodontics, Yogita Dental College and Hospital, Ratnagiri, Maharashtra, India
| | - Surabhi Ghosh
- Department of Conservative Dentistry and Endodontics, Yogita Dental College and Hospital, Ratnagiri, Maharashtra, India
| | - Shirin Kshirsagar
- Department of Conservative Dentistry and Endodontics, Yogita Dental College and Hospital, Ratnagiri, Maharashtra, India
| |
Collapse
|
10
|
Alkattan R, Lippert F, Tang Q, Eckert GJ, Ando M. The influence of hardness and chemical composition on enamel demineralization and subsequent remineralization. J Dent 2018; 75:34-40. [DOI: 10.1016/j.jdent.2018.05.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 05/01/2018] [Accepted: 05/04/2018] [Indexed: 11/28/2022] Open
|
11
|
Nakamoto A, Ikeda M, Hiraishi N, Nikaido T, Uo M, Tagami J. Effect of fluoride mouthrinse on adhesion to bovine root dentin. Dent Mater J 2018; 37:919-927. [PMID: 29998943 DOI: 10.4012/dmj.2017-370] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The purpose of this study was to evaluate the effect of fluoride mouthrinses on dentin bonding performance of a two-step selfetch adhesive; Clearfil SE Bond. Bovine root dentin surface was treated with either 450, 900, or 9,000 ppm F solutions for 30 s (immediate), and continually treated for one month (one month) before the bonding procedures. Microtensile bond strength (µTBS) test and scanning electron microscopic (SEM) observation of the acid-base resistance zone (ABRZ) were performed. Chemical state of fluorine on dentin surface was analyzed by X-ray absorption fine structure (XAFS). The 450 and 900 ppm F fluoride mouthrinses did not influence the µTBS to dentin, while the 9,000 ppm F fluoride solution adversely affected the µTBSs. The fluoride application to dentin significantly enhanced acid resistance at the adhesive/dentin interface including the ABRZ. The XAFS analysis indicated different concentrations of fluoride might create different chemical compounds on the dentin surface, influencing the µTBS results.
Collapse
Affiliation(s)
- Ayako Nakamoto
- Cariology and Operative Dentistry, Oral Restitution Department, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Masaomi Ikeda
- Oral Prosthetic Engineering, Graduate School, Tokyo Medical and Dental University, Tokyo Medical and Dental University
| | - Noriko Hiraishi
- Cariology and Operative Dentistry, Oral Restitution Department, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Toru Nikaido
- Cariology and Operative Dentistry, Oral Restitution Department, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Motohiro Uo
- Advanced Biomaterials Department, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.,Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo
| | - Junji Tagami
- Cariology and Operative Dentistry, Oral Restitution Department, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| |
Collapse
|
12
|
Ei TZ, Shimada Y, Nakashima S, Romero MJRH, Sumi Y, Tagami J. Comparison of resin-based and glass ionomer sealants with regard to fluoride-release and anti-demineralization efficacy on adjacent unsealed enamel. Dent Mater J 2018; 37:104-112. [PMID: 28954939 DOI: 10.4012/dmj.2016-407] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study compared resin-based and glass ionomer sealants with regard to their fluoride-release behavior and anti-demineralization potential on adjacent unsealed enamel surfaces. Sealant cavities prepared on bovine enamel blocks were filled with fluoride-containing resin sealants [TeethmateF-1 (TF), ClinproTM (CP)], and glass ionomer sealant [Fuji VII (FVII)]. Specimens were then incubated in artificial saliva for 14 days to measure fluoride. Thereafter, demineralization was performed for 10 days, and the anti-demineralization efficacy was assessed by Swept Source Optical Coherence Tomography (SS-OCT), and cross-sectional nanohardness. All data were statistically analyzed by using ANOVA. FVII exhibited the highest fluoride release. SS-OCT and nanohardness findings indicated that anti-demineralization efficacy of TF was the greatest, whereas FVII was not significantly different from that of CP. Resin sealants released a lower amount of fluoride but exhibited anti-demineralization effects on the adjacent unsealed enamel surfaces that were comparable to that of a glass ionomer sealant.
Collapse
Affiliation(s)
- Thwe Zin Ei
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University
| | - Yasushi Shimada
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University.,Department of Operative Dentistry, Okayama University
| | - Syozi Nakashima
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University
| | - Maria Jacinta Rosario H Romero
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University.,School of Dentistry, Centro Escolar University
| | - Yasunori Sumi
- Department for Advanced Dental Research, Center of Advanced Medicine for Dental and Oral Diseases, National Center for Geriatrics and Gerontology
| | - Junji Tagami
- Cariology and Operative Dentistry, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University
| |
Collapse
|
13
|
In-office dental bleaching with light vs. without light: A systematic review and meta-analysis. J Dent 2017; 70:1-13. [PMID: 29289725 DOI: 10.1016/j.jdent.2017.11.007] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 11/13/2017] [Accepted: 11/19/2017] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE A systematic review and meta-analysis were performed to answer the following research question: Does light-activated in-office vital bleaching have a greater whitening efficacy and higher tooth sensitivity (TS) in comparison with in-office vital bleaching without light when used in adults? DATA AND SOURCE Only randomized clinical trials (RCTs) involving adults who had in-office bleaching with and without light activation were included. Controlled vocabulary and keywords were used in a comprehensive search for titles and abstracts in PubMed, and this search was adapted for Scopus, Web of Science, LILACS, BBO, Cochrane Library, and SIGLE without restrictions in May 2016 and was updated in August 2017. IADR abstracts (1990-2016), unpublished- and ongoing-trial registries, dissertations, and theses were also searched. The risk-of-bias tool of the Cochrane Collaboration was used for quality assessment. The quality of the evidence was rated using the Grading of Recommendations: Assessment, Development, and Evaluation approach. Through the use of the random effects model, a meta-analysis with a subgroup analysis (low and high hydrogen peroxide concentration) was conducted for color change (ΔE*, ΔSGU) as well as the risk and intensity of TS. STUDY SELECTION We retrieved 6663 articles, but after removing duplicates and non-relevant articles, only 21 RCTs remained. No significant difference in ΔE*, ΔSGU, and risk and intensity of TS was observed (p > .05). For ΔE and risk of TS, the quality of the evidence was graded as moderate whereas the evidence for ΔSGU and intensity of TS was graded as very low and low, respectively. CONCLUSION Without considering variations in the protocols, the activation of in-office bleaching gel with light does not seem to improve color change or affect tooth sensitivity, regardless of the hydrogen peroxide concentration. (PROSPERO - CRD42016037630). CLINICAL RELEVANCE Although it is commercially claimed that in-office bleaching associated with light improves and accelerates color change, this study did not confirm this belief for in-office bleaching gels with either high or low levels of hydrogen peroxide.
Collapse
|
14
|
Baumann T, Bereiter R, Lussi A, Carvalho TS. The effect of different salivary calcium concentrations on the erosion protection conferred by the salivary pellicle. Sci Rep 2017; 7:12999. [PMID: 29021538 PMCID: PMC5636785 DOI: 10.1038/s41598-017-13367-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 09/22/2017] [Indexed: 11/17/2022] Open
Abstract
Different proportions of mineral ions in saliva can influence the protective effect the salivary pellicle provides against dental erosion. To investigate the effect of different calcium concentrations in human saliva on the protection against enamel erosion, enamel specimens were divided into 8 treatment groups: humid chamber (Ctrl); whole mouth stimulated human saliva (HS); artificial saliva containing different calcium concentrations (ASlow, ASmedium, AShigh); and dialysed human saliva containing different calcium concentrations (DSlow, DSmedium, DShigh). The specimens underwent 4 cycles of incubation in the treatment group followed by an erosive challenge. Surface hardness and calcium release were measured during the cycling process. All DS groups exhibited significantly higher enamel surface softening than HS and the corresponding AS groups. Among the DS groups, the surface softening was significantly higher in DSlow than in DShigh. No significant differences were found within the AS or DS groups regarding calcium release. The results of this study indicated that erosion protection conferred by saliva depends on an interplay between salivary proteins and ions. While both proteins and ions have a positive effect on their own, the combination of the two can lead to different degrees of protection or even negative effects, depending on the relative concentrations.
Collapse
Affiliation(s)
- T Baumann
- Department of Preventive, Restorative and Pediatric Dentistry, University of Bern, Freiburgstrasse 7, CH-3010, Bern, Switzerland.
| | - R Bereiter
- Department of Preventive, Restorative and Pediatric Dentistry, University of Bern, Freiburgstrasse 7, CH-3010, Bern, Switzerland
| | - A Lussi
- Department of Preventive, Restorative and Pediatric Dentistry, University of Bern, Freiburgstrasse 7, CH-3010, Bern, Switzerland
| | - T S Carvalho
- Department of Preventive, Restorative and Pediatric Dentistry, University of Bern, Freiburgstrasse 7, CH-3010, Bern, Switzerland
| |
Collapse
|
15
|
Ujiie H, Nakashima S, Tanaka M. Warmed acidulated phosphate fluoride enhances release of fluoride from human enamel surfaces, promoting lesion remineralization in vitro and in situ. PEDIATRIC DENTAL JOURNAL 2017. [DOI: 10.1016/j.pdj.2016.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
16
|
Erosion protection conferred by whole human saliva, dialysed saliva, and artificial saliva. Sci Rep 2016; 6:34760. [PMID: 27703230 PMCID: PMC5050492 DOI: 10.1038/srep34760] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 09/19/2016] [Indexed: 11/26/2022] Open
Abstract
During dental erosion, tooth minerals are dissolved, leading to a softening of the surface and consequently to irreversible surface loss. Components from human saliva form a pellicle on the tooth surface, providing some protection against erosion. To assess the effect of different components and compositions of saliva on the protective potential of the pellicle against enamel erosion, we prepared four different kinds of saliva: human whole stimulated saliva (HS), artificial saliva containing only ions (AS), human saliva dialysed against artificial saliva, containing salivary proteins and ions (HS/AS), and human saliva dialysed against deionised water, containing only salivary proteins but no ions (HS/DW). Enamel specimens underwent four cycles of immersion in either HS, AS, HS/AS, HS/DW, or a humid chamber (Ctrl), followed by erosion with citric acid. During the cycling process, the surface hardness and the calcium released from the surface of the specimens were measured. The different kinds of saliva provided different levels of protection, HS/DW exhibiting significantly better protection than all the other groups (p < 0.0001). Different components of saliva, therefore, have different effects on the protective properties of the pellicle and the right proportions of these components in saliva are critical for the ability to form a protective pellicle.
Collapse
|
17
|
Romero MJRH, Nakashima S, Nikaido T, Sadr A, Tagami J. In vitro dentine remineralization with a potential salivary phosphoprotein homologue. Arch Oral Biol 2016; 68:35-42. [PMID: 27054701 DOI: 10.1016/j.archoralbio.2016.03.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 03/21/2016] [Accepted: 03/22/2016] [Indexed: 10/22/2022]
Abstract
OBJECTIVE Advantages of introducing a salivary phosphoprotein homologue under standardized in vitro conditions to simulate the mineral-stabilizing properties of saliva have been proposed. This study longitudinally investigates the effects of casein, incorporated as a potential salivary phosphoprotein homologue in artificial saliva (AS) solutions with/without fluoride (F) on in vitro dentine lesion remineralization. DESIGN Thin sections of bovine root dentine were demineralized and allocated randomly into 6 groups (n=18) having equivalent mineral loss (ΔZ) after transverse microradiography (TMR). The specimens were remineralized using AS solutions containing casein 0μg/ml, F 0ppm (C0-F0); casein 0μg/ml, F 1ppm (C0-F1); casein 10μg/ml, F 0ppm (C10-F0); casein 10μg/ml, F 1ppm (C10-F1); casein 100μg/ml, F 0ppm (C100-F0) or casein 100μg/ml, F 1ppm (C100-F1) for 28days with TMR taken every 7 days. RESULTS Surface mineral precipitation, evident in group C0-F1, was apparently inhibited in groups with casein incorporation. Repeated measures ANOVA with Bonferroni correction revealed higher ΔZ for non-F and non-casein groups than for their counterparts (p<0.001). Subsequent multiple comparisons showed that mineral gain was higher (p<0.001) with 10μg/ml casein than with 100μg/ml when F was present in the earlier stages of remineralization, with both groups achieving almost complete remineralization after 28 days. CONCLUSION Casein is a potential salivary phosphoprotein homologue that could be employed for in vitro dentine remineralization studies. Concentration related effects may be clinically significant and thus must be further examined.
Collapse
Affiliation(s)
- Maria Jacinta Rosario H Romero
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; University of the Philippines Manila College of Dentistry, Pedro Gil corner Taft Avenue, Manila 1000, Philippines.
| | - Syozi Nakashima
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Toru Nikaido
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Alireza Sadr
- International Exchange Center, Tokyo Medical and Dental University,1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; Department of Restorative Dentistry, University of Washington School of Dentistry, 1959 NE Pacific Street, Box 357456 Seattle, WA, USA.
| | - Junji Tagami
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| |
Collapse
|
18
|
Predictive factors on the efficacy and risk/intensity of tooth sensitivity of dental bleaching: A multi regression and logistic analysis. J Dent 2015; 45:1-6. [PMID: 26612623 DOI: 10.1016/j.jdent.2015.11.003] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 11/11/2015] [Accepted: 11/17/2015] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVES The aim of this study was to identify predictor factors associated with the whitening outcome and risk and intensity of bleaching-induced tooth sensitivity from pooled data of 11 clinical trials of dental bleaching performed by the same research group. METHODS The individual patient data of several published and ongoing studies about dental bleaching was collected and retrospectively analyzed. At the patient-level, independent variables (bleaching techniques [at-home and in-office protocols], sex, age and baseline tooth color in shade guide unit [SGU]) as well as dependent variables (color change in shade guide units (ΔSGU), color change in the CIEL*a*b* system (ΔE), risk and intensity of TS in a visual analog scale) were collected. Multivariable linear regression and multivariable logistic regression models were carried out using backward elimination whenever the p-values were higher than 0.05. RESULTS A significant relationship between baseline color and age on color change estimates was detected (p<0.001). Every increase of one SGU in the baseline color resulted in an increase of approximate 0.66 in the final ΔSGU and 2.48 for the ΔE. For every increase of one year in the participant's age we observed a decrease of the whitening degree of 0.07 for the final ΔSGU and 0.69 for the ΔE. The bleaching technique was shown to be a significant predictor of ΔSGU (p<0.001) but not of ΔE. In regard to TS, baseline color and bleaching technique are significant predictors (p<0.001). The risk of TS for at-home bleaching was 51% (95% CI 41.4-60.6) and for the in-office 62.9% (95% CI 56.9-67.3). CONCLUSIONS Younger patients with darker teeth reach a higher degree of whitening. Patient with darker teeth and submitted to at-home bleaching presents lower risk and intensity of TS. CLINICAL SIGNIFICANCE The baseline color of the teeth and the patient's age is directly related to the effectiveness of dental bleaching and TS.
Collapse
|
19
|
Romero MJRH, Nakashima S, Nikaido T, Ichinose S, Sadr A, Tagami J. Inhibition of hydroxyapatite growth by casein, a potential salivary phosphoprotein homologue. Eur J Oral Sci 2015; 123:288-96. [PMID: 26083784 DOI: 10.1111/eos.12196] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/29/2015] [Indexed: 11/30/2022]
Abstract
Salivary phosphoproteins are essential in tooth mineral regulation but are often overlooked in vitro. This study aimed to evaluate the effect of casein, as a salivary phosphoprotein homologue, on the deposition and growth of hydroxyapatite (HA) on tooth surfaces. Hydroxyapatite growth was quantified using seeded crystal systems. Artificial saliva (AS) containing HA powder and 0, 10, 20, 50, or 100 μg ml(-1) of casein, or 100 μg ml(-1) of dephosphorylated casein (Dcasein), was incubated for 0-8 h at 37°C, pH 7.2. Calcium concentrations were measured using atomic absorption spectroscopy (AAS). Surface precipitation of HA on bovine enamel and dentine blocks, incubated in similar conditions for 7 d, was examined using field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) with selected area electron diffraction (SAED). Casein adsorption was assessed using modified Lowry assays and zeta-potential measurements. The AAS results revealed a concentration-dependent inhibition of calcium consumption. Hydroxyapatite precipitation occurred when no casein was present, whereas precipitation of HA was apparently completely inhibited in casein-containing groups. Adsorption data demonstrated increasingly negative zeta-potential with increased casein concentration and an affinity constant similar to proline-rich proteins with Langmuir modelling. Casein inhibited the deposition and growth of HA primarily through the binding of esterized phosphate to HA active sites, indicating its potential as a mineral-regulating salivary phosphoprotein homologue in vitro.
Collapse
Affiliation(s)
- Maria J R H Romero
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Syozi Nakashima
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Toru Nikaido
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Shizuko Ichinose
- Instrumental Analysis Research Center, Tokyo Medical and Dental University, Tokyo, Japan
| | - Alireza Sadr
- International Exchange Center, Tokyo Medical and Dental University, Tokyo, Japan.,Department of Restorative Dentistry, University of Washington School of Dentistry, Seattle, WA, USA
| | - Junji Tagami
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| |
Collapse
|
20
|
Khunkar SJ, Utaka S, Hariri I, Sadr A, Ikeda M, Nakashima S, Nikaido T, Tagami J. Formation and characterization of hypermineralized zone beneath dentine lesion body induced by topical fluoride in-vitro. Arch Oral Biol 2015; 60:574-81. [PMID: 25616245 DOI: 10.1016/j.archoralbio.2015.01.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 11/20/2014] [Accepted: 01/03/2015] [Indexed: 11/26/2022]
Abstract
OBJECTIVE This in-vitro study aimed to evaluate and characterize the hypermineralized zone (Hyper-zone) formed beneath the remineralized dentine lesion body by transverse microradiography (TMR), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS). DESIGN Demineralized bovine dentine specimens were treated with fluoride solutions (APF, NaF) and remineralized for 2-4 weeks. Then thin sections were prepared to characterize the Hyper-zone by TMR, EDS. Fractured specimen surfaces were observed by SEM. RESULTS TMR analysis revealed a higher mineral density at Hyper-zone than that of sound dentine (48vol%) ranging from 50 up to 61vol% and the thickness ranging from 197 to 344μm for 4-week specimens, while specimens without fluoride treatment did not show Hyper-zone. SEM pictures at Hyper-zone showed no evident crystal-like deposits in dentinal tubules and no notable difference when compared to that in sound dentine. EDS analysis demonstrated higher concentrations of Ca and P at Hyper-zone than those in sound dentine, which corresponded to the TMR profile, while the magnesium (Mg) concentration was low at this zone. CONCLUSIONS Demineralized dentine lesions exposed to fluoride and remineralization treatments exhibited Hyper-zone beneath the lesion body, in which the mineral density was higher than that of sound dentine. Possible mechanism for the formation of Hyper-zone was discussed by assuming removal of mineral regulators such as Mg and other organic substances from sound dentine during de-/remineralization processes.
Collapse
Affiliation(s)
- Sahar J Khunkar
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Sachiko Utaka
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Ilnaz Hariri
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Alireza Sadr
- International Exchange Center, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Masaomi Ikeda
- Department of Oral Health Care Sciences, Clinical Oral Science of Tokyo Medical and Dental University, 5-45 Yushima 1-chome, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Syozi Nakashima
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Toru Nikaido
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - Junji Tagami
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| |
Collapse
|
21
|
Bakry AS, Takahashi H, Otsuki M, Tagami J. Evaluation of new treatment for incipient enamel demineralization using 45S5 bioglass. Dent Mater 2014; 30:314-20. [PMID: 24433821 DOI: 10.1016/j.dental.2013.12.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 10/13/2013] [Accepted: 12/04/2013] [Indexed: 10/25/2022]
Abstract
Bioglass 45S5 is a silica-based bioactive glass capable of depositing a layer of hydroxyl carbonate apatite on the surface of the glass when immersed in body fluids. The present paper studies a new technique for treating early human dental enamel caries lesions by using a paste composed of 45S5 bioglass and phosphoric acid. Artificial caries lesions were induced in enamel flat surfaces by means of a decalcification solution. All specimens were exposed to a brushing-abrasion challenge to test the durability of any newly formed layer resulting from the application of 45S5 bioglass paste. The specimens treated with bioglass paste showed complete coverage with a layer of brushite crystals. The brushing-abrasion challenge did not statistically affect the percentage of enamel coverage with the crystalline layer formed by the application of bioglass (p<0.05). These crystals were converted to hydroxyapatite crystals when stored in artificial saliva for 14 days. The current technique suggests the possibility of restoring incipient enamel erosive lesion with an abrasion durable layer of hydroxyapatite crystals.
Collapse
Affiliation(s)
- A S Bakry
- Operative Dentistry Department, Faculty of Dentistry, King AbdulAziz University, Jeddah, Saudia Arabia; Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Egypt; Japan Society for the Promotion of Science, Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
| | - H Takahashi
- Oral Biomaterials Engineering, Department of Oral Materials Sciences and Technology, Course of Oral Health Engineering, School of Health Care Sciences, Faculty of Dentistry, Tokyo Medical and Dental University, 1-5-45Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - M Otsuki
- Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
| | - J Tagami
- Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan; Global Center of Excellence Program, ICTB at Tokyo Medical and Dental University, Tokyo, Japan
| |
Collapse
|
22
|
IIZUKA J, MUKAI Y, TANIGUCHI M, MIKUNI-TAKAGAKI Y, TEN CATE JM, TERANAKA T. Chemical alteration by tooth bleaching of human salivary proteins that infiltrated subsurface enamel lesions —Experimental study with bovine lesion model systems—. Dent Mater J 2014; 33:663-8. [DOI: 10.4012/dmj.2014-046] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
23
|
Utaka S, Nakashima S, Sadr A, Ikeda M, Nikaido T, Shimizu A, Tagami J. Cariotester, a new device for assessment of dentin lesion remineralization in vitro. Dent Mater J 2013; 32:241-7. [PMID: 23538759 DOI: 10.4012/dmj.2012-275] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study aimed to evaluate the potential of a new device (Cariotester) for monitoring of incipient carious lesion remineralization in root dentin by topical fluoride in vitro. Demineralized bovine dentin specimens were treated by fluoride solutions (APF or neutral NaF) and remineralized for 4 weeks. Cariotester was used to measure penetration depth (CTR depth) of the indenter into the de- and remineralized specimen surface. The specimens were assessed by transverse microradiography (TMR) to determine lesion parameters (depth: LD, mineral loss: ΔZ). Pearson's correlation analysis showed an overall significant relationship between CTR depth and both TMR parameters. CTR depth appeared to distinguish the positive effect that topical fluoride application had on the remineralization of the outer zone of dentin lesions. Cariotester had the potential to serve as a quantitative tool for monitoring of incipient carious lesion remineralization in root dentin.
Collapse
Affiliation(s)
- Sachiko Utaka
- Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | | | | | | | | | | | | |
Collapse
|
24
|
Nakata K, Nikaido T, Nakashima S, Nango N, Tagami J. An approach to normalizing micro-CT depth profiles of mineral density for monitoring enamel remineralization progress. Dent Mater J 2013; 31:533-40. [PMID: 22864205 DOI: 10.4012/dmj.2011-228] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
To indicate the possibility of a new approach to creating mineral density profiles, and to examine longitudinal changes in 'the rate of remineralization (RA)' and 'the mineral density (DAs) at 4 different depths' (surface zone: SZ, lesion body: LB, middle zone: MZ, deep zone near to sound area: DZ) in enamel subsurface lesions, eight demineralized bovine enamel-dentin blocks were remineralized for 1 to 4 week and investigated using Micro-focus X-ray CT (micro-CT). After CT scanning, mineral density profiles were created.Mineral densities at each depth after demineralization were SZ is approximately equal to LB<MZ<DZ. Increase in RA was the greatest in the first week of remineralization and it decreased over time. Increments of the mineral density were greater in the order of SZ is approximately equal to LB>MZ>DZ. This study indicated a new approach to create a mineral density profile and suggested the greater the value of the mineral density before the remineralization, the smaller the mineral density increments.
Collapse
Affiliation(s)
- Keiko Nakata
- Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | | | | | | | | |
Collapse
|
25
|
The durability of phosphoric acid promoted bioglass-dentin interaction layer. Dent Mater 2013; 29:357-64. [PMID: 23347789 DOI: 10.1016/j.dental.2012.12.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 11/12/2012] [Accepted: 12/12/2012] [Indexed: 11/22/2022]
Abstract
OBJECTIVES Phosphoric acid-Bioglass 45S5 paste can create an interaction layer formed of calcium-phosphate crystals on the dentin surface. In this study, the efficiency of decreasing the dentin permeability exerted by the interaction layer formed between bioglass and dentin was compared to a resin-containing oxalate desensitizing agent (MS Coat One) and a resin-free oxalate desensitizing agent (Super Seal). METHODS Dentin permeability was measured before/after a brushing abrasion challenge, followed by examining the top and the fractured dentin surfaces with a field emission scanning electron microscope. Moreover, the chemical nature of the compounds formed on top of the dentin surface was examined using the field emission scanning electron microscope (FE-SEM) equipped with an energy-dispersive X-ray spectroscope (EDS), and the crystalline structures of the dentinal surfaces were examined by X-ray diffraction (XRD). RESULTS The results showed that application of 45S5 bioglass paste to dentin was able to occlude patent dentinal tubule orifices with a layer of calcium-phosphate crystals, while the oxalate containing agents were able to form small crystals which were found in dentinal tubule orifices and scattered along the superficial parts of the dentinal tubule lumen. The brushing-abrasion challenge significantly increased the permeability of dentin treated by Super Seal and MS Coat One, while these challenges had no significant effect on the dentin permeability of specimens treated with 45S5 bioglass paste. SIGNIFICANCE The new technique provided better durability than two products available on the market. Moreover, our previous research showed the biocompatibility of using this technique on dental pulp cells, suggesting that this technique can aid in treating dentin hypersensitivity cases.
Collapse
|
26
|
Hariri I, Sadr A, Nakashima S, Shimada Y, Tagami J, Sumi Y. Estimation of the Enamel and Dentin Mineral Content from the Refractive Index. Caries Res 2013; 47:18-26. [DOI: 10.1159/000342416] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 08/01/2012] [Indexed: 11/19/2022] Open
|
27
|
Martins C, Castro G, Siqueira M, Xiao Y, Yamaguti P, Siqueira W. Effect of Dialyzed Saliva on Human Enamel Demineralization. Caries Res 2013; 47:56-62. [DOI: 10.1159/000343574] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2012] [Indexed: 11/19/2022] Open
|
28
|
Eimar H, Siciliano R, Abdallah MN, Nader SA, Amin WM, Martinez PP, Celemin A, Cerruti M, Tamimi F. Hydrogen peroxide whitens teeth by oxidizing the organic structure. J Dent 2012; 40 Suppl 2:e25-33. [DOI: 10.1016/j.jdent.2012.08.008] [Citation(s) in RCA: 116] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 07/24/2012] [Accepted: 08/14/2012] [Indexed: 11/26/2022] Open
|
29
|
Thanatvarakorn O, Nakashima S, Sadr A, Prasansuttiporn T, Ikeda M, Tagami J. In vitroevaluation of dentinal hydraulic conductance and tubule sealing by a novel calcium-phosphate desensitizer. J Biomed Mater Res B Appl Biomater 2012; 101:303-9. [DOI: 10.1002/jbm.b.32840] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Revised: 07/27/2012] [Accepted: 09/25/2012] [Indexed: 11/10/2022]
|
30
|
Lippert F. Dose-response effects of zinc and fluoride on caries lesion remineralization. Caries Res 2012; 46:62-8. [PMID: 22286505 DOI: 10.1159/000335573] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Accepted: 12/06/2011] [Indexed: 11/19/2022] Open
Abstract
The present mechanistic in vitro study aimed to investigate dose-response effects of zinc and fluoride on caries lesion remineralization and subsequent protection from demineralization. Artificial caries lesions were created using a methylcellulose acid gel system. Lesions were remineralized for 2 weeks using citrate-containing artificial saliva which was supplemented with zinc (0-153 μmol/l) and fluoride (1.1 or 52.6 μmol/l) in a 7 × 2 factorial design. Lesions were also remineralized in the absence of zinc and citrate, but in the presence of fluoride. After remineralization, all lesions were demineralized for 1 day under identical conditions. Changes in mineral distribution characteristics of caries lesions after remineralization and secondary demineralization were studied using transverse microradiography. At 1.1 μmol/l fluoride, zinc exhibited detrimental effects on remineralization in a dose-response manner and mainly by preventing remineralization near the lesion surface. At 52.6 μmol/l fluoride, zinc retarded remineralization only at the highest concentration tested. Zinc enhanced overall remineralization at 3.8-15.3 μmol/l. At 76.5 and less so at 153 μmol/l, zinc showed extensive remineralization of deeper parts within the lesions at the expense of remineralization near the surface. Citrate did not interfere with remineralization at 1.1 μmol/l fluoride, but enhanced remineralization at 52.6 μmol/l fluoride. Lesions exhibiting preferential remineralization in deeper parts showed higher mineral loss after secondary demineralization, suggesting the formation of more soluble mineral phases during remineralization. In summary, zinc and fluoride showed synergistic effects in enhancing lesion remineralization, however only at elevated fluoride concentrations.
Collapse
Affiliation(s)
- F Lippert
- Department of Preventive and Community Dentistry, Oral Health Research Institute, Indiana University School of Dentistry, Indianapolis, IN 46202, USA.
| |
Collapse
|
31
|
Kitasako Y, Tanaka M, Sadr A, Hamba H, Ikeda M, Tagami J. Effects of a chewing gum containing phosphoryl oligosaccharides of calcium (POs-Ca) and fluoride on remineralization and crystallization of enamel subsurface lesions in situ. J Dent 2011; 39:771-9. [DOI: 10.1016/j.jdent.2011.08.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2011] [Revised: 08/09/2011] [Accepted: 08/12/2011] [Indexed: 01/12/2023] Open
|
32
|
Lynch RJM. Zinc in the mouth, its interactions with dental enamel and possible effects on caries; a review of the literature. Int Dent J 2011; 61 Suppl 3:46-54. [PMID: 21762155 PMCID: PMC9374993 DOI: 10.1111/j.1875-595x.2011.00049.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2023] Open
Abstract
Zinc is an essential trace element. In the mouth, it is present naturally in plaque, saliva and enamel. Zinc is formulated into oral health products to control plaque, reduce malodour and inhibit calculus formation. It has good oral substantivity, and elevated concentrations can persist for many hours in plaque and saliva following delivery from mouthrinses and toothpastes. Although low concentrations of zinc can both reduce enamel demineralisation and modify remineralisation, during caries clinical trials, the addition of zinc to fluoride toothpastes has not affected their ability to reduce caries. Mechanistic studies may help explain this apparent contradiction. Zinc is readily desorbed from hydroxyapatite by calcium, which is plentiful in plaque and saliva. Where crystal-growth sites remain occupied by zinc despite this, they may simply be 'over-grown' by remineralisation initiated at unoccupied sites. Further, under certain conditions, low concentrations of zinc can enhance remineralisation of enamel lesions, by retarding lesion arrestment. Although this may help to explain the apparent lack of an overall zinc effect on caries, it seems unlikely that any negative effects would be countered exactly by positive effects. Further mechanistic studies, complementing well-designed in vitro and in situ caries studies, should lead to further understanding of the zinc-enamel interactions relevant to demineralisation and remineralisation.
Collapse
|
33
|
Mineral densities and elemental content in different layers of healthy human enamel with varying teeth age. Arch Oral Biol 2011; 56:997-1004. [PMID: 21411061 DOI: 10.1016/j.archoralbio.2011.02.015] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 01/22/2011] [Accepted: 02/22/2011] [Indexed: 11/21/2022]
Abstract
OBJECTIVES This study aims to evaluate the mineral density, calcium (Ca), and phosphorus (P) weight percent of healthy human enamel of varying human teeth age and enamel layers. METHODS Twenty human teeth were divided into "young" (18-24 years) and "old" (55 ≤ years) age groups. From each tooth, one enamel slab (approximately 8 mm × 2 mm × 1.5 mm) was obtained. All enamel slabs were embedded and scanned by micro-computed tomography. The scanned slices were reconstructed into a 3D image and regions of interest (ROIs) were defined. Then, the mineral density for each ROI was calculated. The Ca and P weight percent in the outer, middle, and inner enamel layers were quantified by scanning electron microscopy with energy dispersive spectroscopy. Finally, the data were analysed using one-way ANOVA and Student's t-test. RESULTS In the two age groups, the mineral density, Ca and P weight percent decreased from outer to the inner enamel layer. The mineral density, Ca and P weight percent in the outer enamel layer in the old age group were significantly higher than those in the young age group (P<0.05); however, no age-dependent differences were observed for these properties in the middle and inner enamel layers (P>0.05). CONCLUSIONS The mineral density, Ca and P weight percent decreased from the outer to the inner enamel layers in the two age groups. In the outer enamel layer, the differences in these properties between the two age groups were significantly different; however, no region-dependent differences were observed in the middle and inner enamel layers.
Collapse
|
34
|
Shellis R, Ganss C, Ren Y, Zero D, Lussi A. Methodology and Models in Erosion Research: Discussion and Conclusions. Caries Res 2011; 45 Suppl 1:69-77. [DOI: 10.1159/000325971] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
|
35
|
Lynch R, Churchley D, Butler A, Kearns S, Thomas G, Badrock T, Cooper L, Higham S. Effects of Zinc and Fluoride on the Remineralisation of Artificial Carious Lesions under Simulated Plaque Fluid Conditions. Caries Res 2011; 45:313-22. [DOI: 10.1159/000324804] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Accepted: 01/27/2011] [Indexed: 11/19/2022] Open
|
36
|
Lippert F, Lynch R, Eckert G, Kelly S, Hara A, Zero D. In situ Fluoride Response of Caries Lesions with Different Mineral Distributions at Baseline. Caries Res 2011; 45:47-55. [DOI: 10.1159/000323846] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Accepted: 12/20/2010] [Indexed: 11/19/2022] Open
|
37
|
Lippert F, Butler A, Lynch R. Enamel Demineralization and Remineralization under Plaque Fluid-Like Conditions: A Quantitative Light-Induced Fluorescence Study. Caries Res 2011; 45:155-61. [DOI: 10.1159/000325743] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Accepted: 02/16/2011] [Indexed: 11/19/2022] Open
|
38
|
He B, Huang S, Jing J, Hao Y. Measurement of hydroxyapatite density and Knoop hardness in sound human enamel and a correlational analysis between them. Arch Oral Biol 2010; 55:134-41. [PMID: 20064635 DOI: 10.1016/j.archoralbio.2009.12.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2009] [Revised: 12/11/2009] [Accepted: 12/21/2009] [Indexed: 10/20/2022]
Abstract
OBJECTIVE The aim of this study was to measure the hydroxyapatite (HAP) density and Knoop hardness (KHN) of enamel slabs and to analyse the relationship between them. DESIGN Twenty enamel slabs (10 lingual sides and 10 buccal sides) were prepared and scanned with micro-CT. Tomographic images of each slab from dental cusp to dentinoenamel junction (DEJ) were reconstructed. On these three-dimensional (3D) images, regions of interest (ROIs) were defined at an interval of 50 microm, and the HAP density for each ROI was calculated. Then the polished surfaces were indented from cusp to DEJ at intervals of 50 microm with a Knoop indenter. Finally, the data were analysed with one-way ANOVA, Student's t-test, and linear regression analysis. RESULTS The HAP density and KHN decreased from the dental cusp to DEJ. Both HAP density and KHN in the outer-layer enamel were significantly higher than those in the middle- or inner-layer enamel (P<0.05). The HAP density showed no significant difference between the buccal and lingual sides for enamel in the outer, middle and inner layers, respectively (P>0.05). The KHN in the outer-layer enamel of the lingual sides was significantly lower than that of the buccal sides (P<0.05); there was no significant difference between the lingual and buccal sides in the middle or inner layer. Linear regression analysis revealed a linear relationship between the mean KHN and the mean HAP density (r=0.87). CONCLUSION Both HAP density and KHN decrease simultaneously from dental cusp to DEJ, and the two properties are highly correlated.
Collapse
Affiliation(s)
- Bing He
- State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China
| | | | | | | |
Collapse
|
39
|
Nakashima S, Yoshie M, Sano H, Bahar A. Effect of a test dentifrice containing nano-sized calcium carbonate on remineralization of enamel lesions in vitro. J Oral Sci 2009; 51:69-77. [DOI: 10.2334/josnusd.51.69] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
|