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Satou R, Miki N, Iwasaki M, Sugihara N. Fully Automated Bioreactor-Based pH-Cycling System for Demineralization: A Comparative Study with a Conventional Method. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4929. [PMID: 37512204 PMCID: PMC10381292 DOI: 10.3390/ma16144929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 07/07/2023] [Accepted: 07/08/2023] [Indexed: 07/30/2023]
Abstract
This study aimed to develop an automated pH-cycling system using inexpensive commercial components that can replicate pH fluctuations in the oral cavity and salivary clearance to compare demineralization characteristics with the conventional method. The study found that the newly developed cycle-1 group showed improved demineralization properties, including apparent lesion depth, surface roughness, Vickers hardness, mineral loss, and depth of demineralization, compared to the control group. Additionally, the cycle-2 group, which had a longer cycle interval, showed further improvements in the demineralization properties. This system can replicate the differences in dental damage caused by differences in meals, snacking frequencies, and lifestyle rhythms, making it useful in cariology, preventive dentistry research, and oral care product development. It can be constructed using inexpensive commercial products, significantly reducing research costs and improving reproducibility and fairness between different experimental facilities. The system can replicate lifestyle rhythms, such as meals, sleep, and oral clearance by saliva, making it an in vitro pseudo-oral cavity.
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Affiliation(s)
- Ryouichi Satou
- Department of Epidemiology and Public Health, Tokyo Dental College, Tokyo 101-0061, Japan
| | - Naoko Miki
- Department of Epidemiology and Public Health, Tokyo Dental College, Tokyo 101-0061, Japan
| | - Miyu Iwasaki
- Department of Epidemiology and Public Health, Tokyo Dental College, Tokyo 101-0061, Japan
| | - Naoki Sugihara
- Department of Epidemiology and Public Health, Tokyo Dental College, Tokyo 101-0061, Japan
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2
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Morais AMDS, Pereira YMR, Souza-Araújo IJD, Silva DF, Pecorari VGA, Gomes OP, Nociti-Júnior FH, Puppin-Rontani RM, Vieira-Junior WF, Lisboa-Filho PN, Kantovitz KR. TiO2 nanotube-containing glass ionomer cements display reduced aluminum release rates. Braz Oral Res 2022; 36:e097. [PMID: 35830141 DOI: 10.1590/1807-3107bor-2022.vol36.0097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Accepted: 04/19/2022] [Indexed: 11/21/2022] Open
Abstract
Titanium dioxide nanotubes (TiO2-nts) were incorporated into a glass ionomer cement (GIC) with improved mechanical properties and antibacterial activity. The aims of the present in vitro study were to define the elemental characterization, aluminum (Al) release rate, and initial working time for GIC reinforced with TiO2-nts, in an experimental caries model. TiO2-nts were incorporated into GIC powder components at 5% by weight, and compared with unblended GIC. Experimental approaches used energy-dispersive spectrometry (EDS), atomic absorption spectrophotometry (AAS), and brightness loss to define surface element properties, Al release rates, and initial working time, respectively. Statistical analysis was performed by 2-way ANOVA, Tukey's test, generalized linear models, and Student's t test (a = 0.05). EDS data analysis revealed that TiO2-nts incorporated into GIC had no significant impact on the typical elemental composition of GICs in an in vitro caries model. Regarding the demineralizing solution, GIC with TiO2-nt significantly decreased the Al release rate, compared with the control group (p < 0.0001). Moreover, TiO2-nt incorporated into GIC did not alter the initial working time of the material (p > 0.05). These findings add information to our scientific body of knowledge concerning the potential impact of TiO2-nt on the performance of conventional GICs.
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Affiliation(s)
- Ana Mara da Silva Morais
- Faculdade São Leopoldo Mandic - SLMandic, School of Dentistry, Dental Material Area, Campinas, SP, Brazil
| | | | - Isaac Jordão de Souza-Araújo
- University of Campinas - Unicamp, Piracicaba Dental School, Department of Restorative Dentistry, Piracicaba, SP, Brazil
| | - Daniel Furtado Silva
- Federal University of Paraíba - UFPB, School of Dentistry, Restorative Dentistry Area, João Pessoa, PB, Brazil
| | | | - Orisson Ponce Gomes
- São Paulo State University - Unesp, School of Sciences, Department of Physics, Bauru, SP, Brazil
| | | | - Regina Maria Puppin-Rontani
- University of Campinas - Unicamp, Piracicaba Dental School, Department of Pediatric Dentistry, Piracicaba, SP, Brazil
| | | | | | - Kamila Rosamilia Kantovitz
- Faculdade São Leopoldo Mandic - SLMandic, School of Dentistry, Dental Material Area, Campinas, SP, Brazil
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Rodrigues RV, Sampaio CS, Girotto AC, Pinhatti CP, Iwamoto AS, de Freitas AZ, Ambrosano GMB, Puppin-Rontani RM, Pascon FM. Analysis of enamel/restoration interface submitted cariogenic challenge and fluoride release. Microsc Res Tech 2021; 84:2857-2866. [PMID: 34048111 DOI: 10.1002/jemt.23844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 04/23/2021] [Accepted: 05/14/2021] [Indexed: 11/07/2022]
Abstract
The treatment of high-risk patients still is a challenge. The understanding and development non-invasive, non-destructive, and non-ionizing techniques, can help to guide the treatment and the diagnosis of primary and recurrent caries. The present study evaluated the behavior of enamel/restoration interface after a cariogenic challenge by Fourier domain optical coherence tomography (FD-OCT), scanning electron microscopy (SEM) examination, and the fluoride release of the different restorative materials. Cavities (1.5 × 0.5 mm) were performed in enamel surface and divided into groups (n = 8): glass ionomer cement (GIC), resin-modified glass ionomer cement (RMGIC), and resin composite (RC). The samples were submitted to pH-cycling, and the solutions analyzed for cumulative fluoride by ion-analyzer. The morphology was analyzed by SEM through replicas. The optical attenuation coefficient (OAC) was calculated through exponential decay from the images generated by FD-OCT. Data were analyzed considering α = 0.05. OAC values increased for all groups after pH-cycling indicating demineralization (p < .05). Considering the remineralizing solution, RMGIC presented higher fluoride release rate, followed by GIC, while RC did not release any fluoride. Yet for the demineralizing solution, RMGIC and GIC released similar fluoride rates, overcoming RC (p < .05). Micrographs revealed no changes on the restorations margins, although enamel detachment was observed for RC and GIC after pH-cycling.
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Affiliation(s)
- Raquel Viana Rodrigues
- Department of Restorative Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil.,Department of Oral Health Sciences, UBC Faculty of Dentistry, Vancouver, Canada
| | - Camila Sobral Sampaio
- Department of Restorative Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil.,Department of Biomaterials, Universidad de Los Andes, Santiago, Chile
| | - Aline Carvalho Girotto
- Department of Restorative Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
| | - Caroline Paiuta Pinhatti
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
| | - Alexsandra Shizue Iwamoto
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
| | | | | | - Regina Maria Puppin-Rontani
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
| | - Fernanda Miori Pascon
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, UNICAMP, Piracicaba, Brazil
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Subramaniam P, Babu KLG, Teleti S. Effect of varnish containing casein phosphopeptides-amorphous calcium phosphate and fluoride on surface microhardness of enamel – An in vitro study. SAUDI JOURNAL OF ORAL SCIENCES 2020. [DOI: 10.4103/sjos.sjoralsci_43_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Santos SS, Delbem ACB, Moraes JCS, Souza JAS, Oliveira LQC, Pedrini D. Resin-modified glass ionomer containing calcium glycerophosphate: physico-mechanical properties and enamel demineralization. J Appl Oral Sci 2019; 27:e20180188. [PMID: 30810634 PMCID: PMC6382320 DOI: 10.1590/1678-7757-2018-0188] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 09/11/2018] [Indexed: 11/21/2022] Open
Abstract
Sources of calcium and phosphate have been added to dental restorative materials to improve their anticaries effect.
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Affiliation(s)
- Sâmia Sass Santos
- Universidade Estadual Paulista (UNESP), Faculdade de Odontologia, Departamento de Odontopediatria e Odontologia Social, Araçatuba, São Paulo, Brasil
| | - Alberto Carlos Botazzo Delbem
- Universidade Estadual Paulista (UNESP), Faculdade de Odontologia, Departamento de Odontopediatria e Odontologia Social, Araçatuba, São Paulo, Brasil
| | - João Carlos Silos Moraes
- Universidade Estadual Paulista (UNESP), Faculdade de Engenharia, Departamento de Física e Química, Ilha Solteira, São Paulo, Brasil
| | - José Antônio Santos Souza
- Universidade Estadual Paulista (UNESP), Faculdade de Odontologia, Departamento de Odontopediatria e Odontologia Social, Araçatuba, São Paulo, Brasil
| | - Lenara Queiroz Chaves Oliveira
- Universidade Estadual Paulista (UNESP), Faculdade de Odontologia, Departamento de Odontopediatria e Odontologia Social, Araçatuba, São Paulo, Brasil
| | - Denise Pedrini
- Universidade Estadual Paulista (UNESP), Faculdade de Odontologia, Departamento de Cirurgia e Clínica Integrada, Araçatuba, São Paulo, Brasil
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Hosida TY, Delbem ACB, Morais LA, Moraes JCS, Duque C, Souza JAS, Pedrini D. Ion release, antimicrobial and physio-mechanical properties of glass ionomer cement containing micro or nanosized hexametaphosphate, and their effect on enamel demineralization. Clin Oral Investig 2018; 23:2345-2354. [PMID: 30298451 DOI: 10.1007/s00784-018-2674-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 10/01/2018] [Indexed: 10/28/2022]
Abstract
OBJECTIVES To evaluate the effects of hexametaphosphate microparticles (mHMP) or nanoparticles (nHMP) incorporated in glass ionomer cement (GIC) on antimicrobial and physico-mechanical properties, fluoride (F) release, and enamel demineralization. MATERIAL AND METHODS HMP solutions were obtained at concentrations of 1, 3, 6, 9, and 12%, for screening of antimicrobial activity. Next, mHMP or nHMP at 6, 9, and 12% were incorporated into a resin-modified GIC and the antibacterial activity was evaluated. The resistance to diametral tensile and compressive strength, surface hardness, and degree of monomer conversion as well as F and HMP releases of GICs were determined. Furthermore, specimens were attached to enamel blocks and submitted to pH-cycling, and mineral loss was determined. Parametric and non-parametric tests were performed, after checking data homoscedasticity (p < 0.05). RESULTS HMP solutions at 6, 9, and 12% demonstrated the best antibacterial activity. GIC containing HMP showed better antibacterial effects at 9 and 12% for nHMP. Regarding F and HMP releases, the highest levels of release occurred for groups containing 9 and 12% nHMP. With the increase in HMP concentration, there was lower mineral loss. However, the incorporation of mHMP or nHMP in GIC reduced values of physico-mechanical properties when compared to the control GIC. CONCLUSIONS nHMP improves antimicrobial activity and fluoride release, and decreases enamel demineralization, but reduces the physico-mechanical properties of GIC. CLINICAL RELEVANCE The association of GIC/HMP could be an alternative material for patients at high risk for dental caries and could be indicated for low-stress regions or provisional restorations.
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Affiliation(s)
- Thayse Yumi Hosida
- Department of Pediatric Dentistry and Public Health, School of Dentistry, Araçatuba, São Paulo State University (UNESP), Araçatuba, SP, Brazil
| | - Alberto Carlos Botazzo Delbem
- Department of Pediatric Dentistry and Public Health, School of Dentistry, Araçatuba, São Paulo State University (UNESP), Araçatuba, SP, Brazil
| | - Leonardo Antônio Morais
- Department of Pediatric Dentistry and Public Health, School of Dentistry, Araçatuba, São Paulo State University (UNESP), Araçatuba, SP, Brazil
| | - João Carlos Silos Moraes
- Department of Physics and Chemistry, São Paulo State University (UNESP), Ilha Solteira, SP, Brazil
| | - Cristiane Duque
- Department of Pediatric Dentistry and Public Health, School of Dentistry, Araçatuba, São Paulo State University (UNESP), Araçatuba, SP, Brazil
| | - José Antônio Santos Souza
- Department of Pediatric Dentistry and Public Health, School of Dentistry, Araçatuba, São Paulo State University (UNESP), Araçatuba, SP, Brazil
| | - Denise Pedrini
- Department of Surgery and Integrated Clinic, School of Dentistry, Araçatuba, São Paulo State University (UNESP), Araçatuba, SP, Brazil. .,Disciplina de Clínica Integrada, Faculdade de Odontologia de Araçatuba - UNESP, Rua José Bonifácio 1193, Araçatuba, SP, 16015-050, Brazil.
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Tiveron ARF, Delbem ACB, Gaban G, Sassaki KT, Pedrini D. In vitro enamel remineralization capacity of composite resins containing sodium trimetaphosphate and fluoride. Clin Oral Investig 2015; 19:1899-904. [PMID: 25609034 DOI: 10.1007/s00784-015-1404-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Accepted: 01/12/2015] [Indexed: 10/24/2022]
Abstract
OBJECTIVES This study evaluated the in vitro enamel remineralization capacity of experimental composite resins containing sodium trimetaphosphate (TMP) combined or not with fluoride (F). MATERIALS AND METHODS Bovine enamel slabs were selected upon analysis of initial surface hardness (SH1) and after induction of artificial carious lesions (SH2). Experimental resins were as follows: resin C (control—no sodium fluoride (NaF) or TMP), resin F (with 1.6% NaF), resin TMP (with 14.1% TMP), and resin TMP/F (with NaF and TMP). Resin samples were made and attached to enamel slabs (n = 12 slabs per material). Those specimens (resin/enamel slab) were subjected to pH cycling to promote remineralization, and then final surface hardness (SH3) was measured to calculate the percentage of surface hardness recovery (%SH). The integrated recovery of subsurface hardness (ΔKHN) and F concentration in enamel were also determined. Data was analyzed by ANOVA and Student-Newman-Keuls test (p < 0.05). RESULTS Resins F and TMP/F showed similar SH3 values (p = 0.478) and %SH (p = 0.336) and differed significantly from the other resins (p < 0.001). Considering ΔKHN values, resin TMP/F presented the lowest area of lesion (p < 0.001). The presence of F on enamel was different among the fluoridated resins (p = 0.042), but higher than in the other resins (p < 0.001). CONCLUSIONS The addition of TMP to a fluoridated composite resin enhanced its capacity for remineralization of enamel in vitro. CLINICAL RELEVANCE The combination of two agents with action on enamel favored remineralization, suggesting that composite resins containing sodium trimetaphosphate and fluoride could be indicated for clinical procedures in situations with higher cariogenic challenges.
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Affiliation(s)
| | - Alberto Carlos Botazzo Delbem
- Department of Pediatric and Community Dentistry, Araçatuba Dental School, UNESP - Univ Estadual Paulista, Araçatuba, SP, Brazil
| | - Gabriel Gaban
- Araçatuba Dental School, UNESP - Univ Estadual Paulista, Araçatuba, SP, Brazil
| | - Kikue Takebayashi Sassaki
- Department of Basic Sciences, Araçatuba Dental School, UNESP - Univ Estadual Paulista, Araçatuba, SP, Brazil
| | - Denise Pedrini
- Department of Surgery and Integrated Clinic, Araçatuba Dental School, UNESP - Univ Estadual Paulista, Araçatuba, SP, Brazil. .,Disciplina de Clínica Integrada, Faculdade de Odontologia do Campus de Araçatuba UNESP, Rua José Bonifácio 1193, Araçatuba, SP, 16015-050, Brasil.
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Delben ACB, Cannon M, Vieira AEM, Basso MD, Danelon M, Santo MRE, Stock SR, Xiao X, De Carlo F. Analysis of anticaries potential of pit and fissures sealants containing amorphous calcium phosphate using synchrotron microtomography. Oper Dent 2014; 40:218-23. [PMID: 25268042 DOI: 10.2341/13-325-l] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to analyze the anticaries potential of pit and fissure sealants containing amorphous calcium phosphate (ACP) by synchrotron microtomography. Bovine enamel blocks (4×4 mm; n=50) were selected through surface hardness (Knoop) analysis. Slabs were obtained through cross-sections taken 1 mm from the border of the enamel. Five indentations, spaced 100 μm apart, were made 300 μm from the border. Ten specimens were prepared for each tested material (Ultraseal XT plus TM, Aegis, Embrace, Vitremer and Experimental Sealant). The materials were randomly attached to the sectioned surfaces of the enamel blocks and fixed with sticky wax. The specimens were submitted to pH cycling. After that, the surface hardness (SH1) was determined, and the blocks were submitted to synchrotron microcomputed tomography analysis to calculate the mineral concentration (ΔgHAp cm(-3)) at different areas of the enamel. The comparison between the SH1 and ΔgHAp cm(-3) showed a correlation for all groups (r=0.840; p<0.001). The fluoride groups presented positive values of ΔgHAp cm(-3), indicating a mineral gain that was observed mainly in the outer part of the enamel. The ACP showed mineral loss in the outer enamel compared with fluoride groups, although it inhibited the demineralization in the deeper areas of enamel. The combination of two remineralizing agents (fluoride and ACP) was highly effective in preventing demineralization.
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Caneppele TMF, Jeronymo RDI, Di Nicoló R, de Araújo MAM, Soares LES. In Vitro assessment of dentin erosion after immersion in acidic beverages: surface profile analysis and energy-dispersive X-ray fluorescence spectrometry study. Braz Dent J 2013. [PMID: 23207852 DOI: 10.1590/s0103-64402012000400011] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to investigate the effects of some acidic drinks on dentin erosion, using methods of surface profile (SP) analysis and energy-dispersive X-ray fluorescence spectrometry (EDXRF). One hundred standardized dentin slabs obtained from bovine incisor roots were used. Dentin slabs measuring 5x5 mm were ground flat, polished and half of each specimen surface was protected with nail polish. For 60 min, the dentin surfaces were immersed in 50 mL of 5 different drinks (Gatorade®, Del Valle Mais orange juice®, Coca-Cola®, Red Bull® and white wine), 20 blocks in each drink. The pH of each beverage was measured. After the erosive challenge, the nail polish was removed and SP was analyzed. The mineral concentration of dentin surfaces was determined by means of EDXRF. Data were analyzed statistically by ANOVA and Tukey's test (α=0.05). SP analysis showed that Red-Bull had the highest erosive potential (p<0.05). EDXRF results exhibited a decrease in phosphate in the groups immersed in Red-Bull, orange juice and white wine (p<0.05), and no significant difference in calcium content between the reference surface and eroded surface. In conclusion, this study demonstrated that all studied beverages promoted erosion on root dentin and Red Bull had the highest erosive potential. There was no correlation between pH of beverages and their erosive potential and only the P content changed after erosive challenge.
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Affiliation(s)
- Taciana Marco Ferraz Caneppele
- Department of Restorative Dentistry, São José dos Campos Dental School, Univ Estadual Paulista, São José dos Campos, SP, Brazil
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Kim Y, Son HH, Yi K, Kim HY, Ahn J, Chang J. The color change in artificial white spot lesions measured using a spectroradiometer. Clin Oral Investig 2012; 17:139-46. [DOI: 10.1007/s00784-012-0680-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Accepted: 01/16/2012] [Indexed: 10/14/2022]
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Zhou SL, Zhou J, Watanabe S, Watanabe K, Wen LY, Xuan K. In vitro study of the effects of fluoride-releasing dental materials on remineralization in an enamel erosion model. J Dent 2011; 40:255-63. [PMID: 22227269 DOI: 10.1016/j.jdent.2011.12.016] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 12/19/2011] [Accepted: 12/20/2011] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVES This study was conducted to compare the remineralization effects of five regimens on the loss of fluorescence intensity, surface microhardness, roughness and microstructure of bovine enamel after remineralization. We hope that these results can provide some basis for the clinical application of these materials. METHODS One hundred bovine incisors were prepared and divided into the following five groups, which were treated with distinct dental materials: (1) Clinpro™ XT varnish (CV), (2) F-varnish (FV), (3) Tooth Mousse (TM), (4) Fuji III LC(®) light-cured glass ionomer pit and fissure sealant (FJ) and (5) Base Cement(®) glass polyalkenoate cement (BC). Subsequently, they were detected using four different methods: quantitative light-induced fluorescence, microhardness, surface 3D topography and scanning electron microscopy (SEM). RESULTS The loss of fluorescence intensity of CV, BC and FJ groups showed significant decreases after remineralization (p<0.05). The microhardness values of the BC group were significantly higher than those of the other groups (p<0.05) after 6 weeks of remineralization. The CV group's surface roughness was significantly lower than those of the other groups after 6 weeks of remineralization (p<0.05). Regarding microstructure values, the FV group showed many round particles deposited in the bovine enamel after remineralization. However, the other four groups mainly showed needle-like crystals. CONCLUSIONS Glass ionomer cement (GIC)-based dental materials can promote more remineralization of the artificial enamel lesions than can NaF-based dental materials. Resin-modified GIC materials (e.g., CV and FJ) have the potential for more controlled and sustained release of remineralized agents. The effect of TM requires further study.
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Affiliation(s)
- San Ling Zhou
- Department of Pediatric Dentistry, School of Stomatology, Fourth Military Medical University, 145 West Changle Road, Xi'an 710032, China
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Soares LES, Lima LR, Vieira LDS, Santo AMDE, Martin AA. Erosion effects on chemical composition and morphology of dental materials and root dentin. Microsc Res Tech 2011; 75:703-10. [DOI: 10.1002/jemt.21115] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Accepted: 09/12/2011] [Indexed: 11/06/2022]
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Mickenautsch S, Mount G, Yengopal V. Therapeutic effect of glass-ionomers: an overview of evidence. Aust Dent J 2011; 56:10-5; quiz 103. [PMID: 21332735 DOI: 10.1111/j.1834-7819.2010.01304.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The requirements for an ideal restorative material include adhesion to tooth structure (enamel and dentine) and an ability to withstand the traumas of occlusion. However, some level of an anticaries effect is also desirable. After a long history of glass-ionomer cement (GIC) development, an evidence base in support of the therapeutic effect of GIC, particularly with regard to its anticaries effect, is emerging. This evidence is increasingly presented through systematic reviews of clinical GIC application and, to a certain extent, relates to a caries-preventive effect of the material itself. However, the strength of evidence supporting other aspects of GIC, such as a higher remineralizing effect, fluoride uptake in hard tooth tissue and fluoride release of GIC, is limited. Nevertheless, the results of these in situ and laboratory trials provide valuable insights into factors that facilitate understanding of the clinical efficacy of GIC.
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Affiliation(s)
- S Mickenautsch
- Division of Public Oral Health, University of the Witwatersrand, Johannesburg, South Africa.
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Rodrigues E, Delbem ACB, Pedrini D, Cavassan L. Enamel remineralization by fluoride-releasing materials: proposal of a pH-cycling model. Braz Dent J 2010; 21:446-51. [DOI: 10.1590/s0103-64402010000500012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
This study proposes a pH-cycling model for verifying the dose-response relationship in fluoride-releasing materials on remineralization in vitro. Sixty bovine enamel blocks were selected for the surface microhardness test (SMH1). Artificial caries lesions were induced and surface microhardness test (SMH2) was performed. Forty-eight specimens were prepared with Z 100, Fluroshield, Vitremer and Vitremer ¼ diluted - powder/liquid, and subjected to a pH-cycling model to promote remineralization. After pH-cycling, final surface microhardness (SMH3) was assessed to calculate percent recovery of surface microhardness (%SMHR). Fluoride present in enamel (μg F/mm3) and in the pH-cycling solutions (μg F) was measured. Cross-sectional microhardness was used to calculate mineral content (∆Z). There was no significant difference between Z 100 and control groups on analysis performed on - %SMHR, ∆Z, μg F and mg F/mm3 (p>0.05). Results showed a positive correlation between %SMHR and μg F/mm3 (r=0.9770; p=0.004), %SMHR and μg F (r=0.9939; p=0.0000001), ∆ and μg F/mm3 (r=0.9853; p=0.0002), ∆ and μg F (r=0.9975; p=0.0000001) and between μg F/mm3 and μg F (r=0.9819; p=0.001). The pH-cycling model proposed was able to verify in vitro dose-response relationship of fluoride-releasing materials on remineralization.
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Mickenautsch S, Yengopal V. Demineralization of hard tooth tissue adjacent to resin-modified glass-ionomers and composite resins: a quantitative systematic review. J Oral Sci 2010; 52:347-57. [DOI: 10.2334/josnusd.52.347] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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