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Kongsomjit M, Punyanirun K, Tasachan W, Hamba H, Tagami J, Trairatvorakul C, Thanyasrisung P. Material of choice for non-invasive treatment of dentin caries: An in vitro study using natural carious lesions. Int J Dent Hyg 2023. [PMID: 37746821 DOI: 10.1111/idh.12765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Revised: 03/20/2023] [Accepted: 09/03/2023] [Indexed: 09/26/2023]
Abstract
INTRODUCTION In community settings with limited dental personnel and equipment, and in an era when the aerosol transmission of infectious agents is on the rise, a non-invasive approach to caries management is critical. To provide information on non-invasive material selection, the aim of this study was to compare the remineralization effect of commonly used fluoride-containing materials, adjunctive to the everyday use of fluoride toothpaste (F-toothpaste), on primary tooth natural dentin caries. METHODS Fifty-five specimens were randomly divided into five groups: 38% silver diamine fluoride (SDF), 5% fluoride varnish (F-varnish), glass-ionomer cement (GIC), deionized water (DW) with F-toothpaste slurry, and DW as a control group (n = 11). The lesion depth and mineral density were measured before and after bacterial pH-cycling using micro-computed tomography. The percentage of mineral density change (%MDchange) was quantified. The dependent t-test, Wilcoxon-Signed-Rank Test, and one way ANOVA with Bonferroni correction were used to analyse the data. RESULTS SDF application reduced lesion depth from 844.6 to 759.1 μm (p < 0.045) while increasing mineral density from 551.4 to 763.0 mgHA/cm3 (p < 0.003). Only mineral density rose from 600.2 to 678.4 mgHA/cm3 (p < 0.013) when GIC was used. The other groups showed no difference. The highest %MDchange was also found after SDF treatment (49.7%, p < 0.05), whereas GIC (17.2%, p < 0.05) presented a higher percentage than the F-varnish (2.0%), F-toothpaste (-1.1%) and no-treatment groups (-1.4%). CONCLUSION In this in vitro study, where the pH of cycling was almost neutral, using SDF as an adjunct to F-toothpaste resulted in the highest remineralization compared with other remineralizing materials.
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Affiliation(s)
- Maneekarn Kongsomjit
- Department of Pediatric Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | | | - Wacharaporn Tasachan
- Department of Pediatric Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Hidenori Hamba
- Department of Operative Dentistry, Cariology and Pulp Biology, Tokyo Dental College, Tokyo, Japan
| | - 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
- Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Chutima Trairatvorakul
- Department of Pediatric Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Panida Thanyasrisung
- Department of Microbiology and Center of Excellence on Oral Microbiology and Immunology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
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Nam J, Nguyen DH, Lee S, Heo SM, Park J. Simulation of Non-Carious Cervical Lesions by Computational Toothbrush Model: A Novel Three-Dimensional Discrete Element Method. SENSORS (BASEL, SWITZERLAND) 2022; 22:s22114183. [PMID: 35684809 PMCID: PMC9185324 DOI: 10.3390/s22114183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 05/28/2022] [Accepted: 05/28/2022] [Indexed: 06/01/2023]
Abstract
Non-carious cervical lesions (NCCLs) are saucer-shaped abrasions of a tooth. NCCLs can form due to various etiologies, including toothbrushing wear, acid erosion, and mechanical stress. Owing to this complex interplay, the mechanism of NCCLs in tooth abrasion has not been established. This study aims to develop a numerical method using a computational toothbrush to simulate NCCLs. The forces acting on the teeth and the amount of abrasion generated were evaluated. The discrete element method using in-house code, connected particle model, and Archard wear model were applied for brushing. In the toothbrush model, 42 acrylic tufts were fixed into a toothbrush head. The teeth models with enamel properties comprised four flat plates and two grooves to simulate the anterior teeth and NCCLs. The brushing speed and depth for one cycle were established as simulation parameters. The force applied within the ununiform plane was concentrated on several bristles as the toothbrush passed through the interproximal space. The brushing force (depth) had a greater effect on tooth abrasion than the brushing speed. Toothbrushing abrasion was mainly concentrated in the interproximal space. Therefore, forceful tooth brushing can cause NCCLs from the interproximal space to the cervical area of the tooth.
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Affiliation(s)
- Jinsu Nam
- Department of Mechanical Design Engineering, Kumoh National Institute of Technology, 61, Daehak-Ro, Gumi 39177, Gyeungbuk, Korea; (J.N.); (S.L.)
| | - Duong Hong Nguyen
- Techno Vietnam Co., JSC., TSQ Living Area (Euroland), Mo Lao Ward, Ha Dong District, Hanoi City 12110, Vietnam;
| | - Seungjun Lee
- Department of Mechanical Design Engineering, Kumoh National Institute of Technology, 61, Daehak-Ro, Gumi 39177, Gyeungbuk, Korea; (J.N.); (S.L.)
- Department of Aeronautic, Mechanical and Electrical Convergence Engineering, Kumoh National Institute of Technology, 61, Daehak-Ro, Gumi 39177, Gyeungbuk, Korea
| | - Seok-Mo Heo
- Department of Periodontology, School of Dentistry, Jeonbuk National University, Jeonju 54907, Jeonbuk, Korea
| | - Junyoung Park
- Department of Mechanical Design Engineering, Kumoh National Institute of Technology, 61, Daehak-Ro, Gumi 39177, Gyeungbuk, Korea; (J.N.); (S.L.)
- Department of Aeronautic, Mechanical and Electrical Convergence Engineering, Kumoh National Institute of Technology, 61, Daehak-Ro, Gumi 39177, Gyeungbuk, Korea
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Alshaikh KH, Hamama HHH, Mahmoud SH. Effect of smear layer deproteinization on bonding of self-etch adhesives to dentin: a systematic review and meta-analysis. Restor Dent Endod 2018; 43:e14. [PMID: 29765895 PMCID: PMC5952053 DOI: 10.5395/rde.2018.43.e14] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 01/20/2018] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVES The aim of this systematic review was to critically analyze previously published studies of the effects of dentin surface pretreatment with deproteinizing agents on the bonding of self-etch (SE) adhesives to dentin. Additionally, a meta-analysis was conducted to quantify the effects of the above-mentioned surface pretreatment methods on the bonding of SE adhesives to dentin. MATERIALS AND METHODS An electronic search was performed using the following databases: Scopus, PubMed and ScienceDirect. The online search was performed using the following keywords: 'dentin' or 'hypochlorous acid' or 'sodium hypochlorite' and 'self-etch adhesive.' The following categories were excluded during the assessment process: non-English articles, randomized clinical trials, case reports, animal studies, and review articles. The reviewed studies were subjected to meta-analysis to quantify the effect of the application time and concentration of sodium hypochlorite (NaOCl) and hypochlorous acid (HOCl) deproteinizing agents on bonding to dentin. RESULTS Only 9 laboratory studies fit the inclusion criteria of this systematic review. The results of the meta-analysis revealed that the pooled average microtensile bond strength values to dentin pre-treated with deproteinizing agents (15.71 MPa) was significantly lower than those of the non-treated control group (20.94 MPa). CONCLUSIONS In light of the currently available scientific evidence, dentin surface pretreatment with deproteinizing agents does not enhance the bonding of SE adhesives to dentin. The HOCl deproteinizing agent exhibited minimal adverse effects on bonding to dentin in comparison with NaOCl solutions.
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Affiliation(s)
- Khaldoan H. Alshaikh
- Department of Operative Dentistry, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
| | - Hamdi H. H. Hamama
- Department of Operative Dentistry, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
- Operative Dentistry Discipline, Faculty of Dentistry, The University of Hong Kong, Hong Kong S.A.R., China
| | - Salah H. Mahmoud
- Department of Operative Dentistry, Faculty of Dentistry, Mansoura University, Mansoura, Egypt
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Orrego S, Romberg E, Arola D. Synergistic degradation of dentin by cyclic stress and buffer agitation. J Mech Behav Biomed Mater 2015; 44:121-32. [PMID: 25637823 PMCID: PMC4499057 DOI: 10.1016/j.jmbbm.2015.01.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Revised: 01/05/2015] [Accepted: 01/05/2015] [Indexed: 11/30/2022]
Abstract
Secondary caries and non-carious lesions develop in regions of stress concentrations and oral fluid movement. The objective of this study was to evaluate the influence of cyclic stress and fluid movement on material loss and subsurface degradation of dentin within an acidic environment. Rectangular specimens of radicular dentin were prepared from caries-free unrestored 3rd molars. Two groups were subjected to cyclic cantilever loading within a lactic acid solution (pH = 5) to achieve compressive stresses on the inner (pulpal) or outer sides of the specimens. Two additional groups were evaluated in the same solution, one subjected to movement only (no stress) and the second held stagnant (control: no stress or movement). Exterior material loss profiles and subsurface degradation were quantified on the two sides of the specimens. Results showed that under cyclic stress material loss was significantly greater (p ≤ 0.0005) on the pulpal side than on the outer side and significantly greater (p ≤ 0.05) under compression than tension. However, movement only caused significantly greater material loss (p ≤ 0.0005) than cyclic stress. Subsurface degradation was greatest at the location of highest stress, but was not influenced by stress state or movement.
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Affiliation(s)
- Santiago Orrego
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD, USA
| | - Elaine Romberg
- Department of Endodontics, Prosthodontics, and Operative Dentistry, Dental School, University of Maryland, Baltimore, MD, USA
| | - Dwayne Arola
- Department of Materials Science and Engineering, University of Washington, Seattle, WA, USA; Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, WA, USA.
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Do D, Orrego S, Majd H, Ryou H, Mutluay MM, Xu HHK, Arola D. Accelerated fatigue of dentin with exposure to lactic acid. Biomaterials 2013; 34:8650-8659. [PMID: 23948166 DOI: 10.1016/j.biomaterials.2013.07.090] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2013] [Accepted: 07/26/2013] [Indexed: 11/19/2022]
Abstract
Composite restorations accumulate more biofilm than other dental materials. This increases the likelihood for the hard tissues supporting a restoration (i.e. dentin and enamel) to be exposed to acidic conditions beyond that resulting from dietary variations. In this investigation the fatigue strength and fatigue crack growth resistance of human coronal dentin were characterized within a lactic acid solution (with pH = 5) and compared to that of controls evaluated in neutral conditions (pH = 7). A comparison of the fatigue life distributions showed that the lactic acid exposure resulted in a significant reduction in the fatigue strength (p ≤ 0.001), and nearly 30% reduction in the apparent endurance limit (from 44 MPa to 32 MPa). The reduction in pH also caused a significant decrease (p ≤ 0.05) in the threshold stress intensity range required for the initiation of cyclic crack growth, and significant increase in the incremental rate of crack extension. Exposure of tooth structure to lactic acid may cause demineralization, but it also increases the likelihood of restored tooth failures via fatigue, and after short time periods.
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Affiliation(s)
- D Do
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD USA
| | - S Orrego
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD USA
| | - H Majd
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD USA
| | - H Ryou
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD USA
| | - M M Mutluay
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD USA
- Adhesive Dentistry Research Group, Institute of Dentistry, University of Turku, Turku, Finland
| | - Hockin H K Xu
- Department of Endodontics, Prosthodontics, and Operative Dentistry, Dental School, University of Maryland, Baltimore, MD 21201
| | - D Arola
- Department of Mechanical Engineering, University of Maryland Baltimore County, Baltimore, MD USA
- Department of Endodontics, Prosthodontics, and Operative Dentistry, Dental School, University of Maryland, Baltimore, MD 21201
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GRIPPO JOHNO, SIMRING MARVIN, COLEMAN THOMASA. Abfraction, Abrasion, Biocorrosion, and the Enigma of Noncarious Cervical Lesions: A 20-Year Perspective. J ESTHET RESTOR DENT 2011; 24:10-23. [DOI: 10.1111/j.1708-8240.2011.00487.x] [Citation(s) in RCA: 124] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Kunawarote S, Nakajima M, Shida K, Kitasako Y, Foxton RM, Tagami J. Effect of dentin pretreatment with mild acidic HOCl solution on microtensile bond strength and surface pH. J Dent 2010; 38:261-8. [DOI: 10.1016/j.jdent.2009.11.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Revised: 11/20/2009] [Accepted: 11/20/2009] [Indexed: 11/30/2022] Open
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