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11	Role of chlorhexidine in bond strength to artificially eroded dentin over time. Francisconi dos Rios, Luciana Fávaro, Casas-Apayco, Leslie, Calabria, Marcela Pagani, Francisconi, Paulo Afonso Silveria, Borges, Ana Flávia Sanches, Wang, Linda 04 1900 (has links) El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. / PURPOSE: To assess the long-term effect of a 2% aqueous chlorhexidine (CHX) solution on bond strength to artificially eroded dentin compared to sound dentin. MATERIALS AND METHODS: Flat mid-coronal dentin surfaces of extracted third molars (n = 28) were subjected only to grinding with a 600-grit SiC paper for 1 min (sound dentin S, n = 14) or additionally to erosive pH cycling with a cola-based soft-drink (eroded dentin E, n = 14). After acid etching, rinsing, and air drying, S and E were rehydrated with 1.5 μl of 2% CHX (S2%, n = 7; E2%, n = 7) or of distilled water (control SC, n = 7; EC, n = 7). Composite buildups were incrementally constructed with Filtek Z350 following Adper Single Bond 2 application. Specimens were sectioned into beams, which were subjected to microtensile testing immediately or after 6 or 12 months of aging. Fractured surfaces were observed under a digital microscope (50X magnification). Microtensile bond strength (μTBS) (MPa) was analyzed by three-way ANOVA and Tukey's tests (α = 0.05) and failure mode by the Kruskal-Wallis test (α = 0.05). RESULTS: Compared to sound dentin, eroded dentin was consistently related to lower μTBS. Immediately and after 12-month aging, the effect of CHX was insignificant, but it was significant after 6-month aging, when it conserved the bond strength to both eroded and sound dentin. The percentage of adhesive and mixed failures were equivalent, and significantly more frequent than cohesive failures, whether in dentin or in composite. CONCLUSION: The 2% CHX effect on bond strength conservation to both eroded and sound dentin was not found to be persistent. / Revisión por pares Tooth erosion Dentin bonding stability chlorhexidine Proteases inhibitors Aging Acid Etching, Dental Anti-Infective Agents, Local Carbon Compounds, Inorganic Carbonated Beverages Chlorhexidine Composite Resins Dental Bonding Dental Cements Dental Etching Dental Materials Dental Stress Analysis Dentin Humans Hydrogen-Ion Concentration Microscopy, Confocal Mouthwashes Phosphoric Acids Saliva, Artificial Silicon Compounds Surface Properties Tensile Strength Time Factors Tooth Erosion Water
12	Effect of simulated intraoral erosion and/or abrasion effects on etch-and-rinse bonding to enamel. Wang, Linda, Casas-Apayco, Leslie, Hipólito, Ana Carolina, Dreibi, Vanessa Manzini, Giacomini, Marina Ciccone, Bim Júnior, Odair, Rios, Daniela, Magalhães, Ana Carolina 02 1900 (has links) El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. / PURPOSE: To assess the influence of simulated oral erosive/abrasive challenges on the bond strength of an etch-and-rinse two-step bonding system to enamel using an in situ/ex vivo protocol. METHODS: Bovine enamel blocks were prepared and randomly assigned to four groups: CONT - control (no challenge), ABR - 3x/day-1 minute toothbrushing; ERO - 3x/day - 5 minutes extraoral immersion into regular Coca Cola; and ERO+ABR - erosive protocol followed by a 1-minute toothbrushing. Eight blocks were placed into an acrylic palatal appliance for each volunteer (n = 13), who wore the appliance for 5 days. Two blocks were subjected to each of the four challenges. Subsequently, all the blocks were washed with tap water and Adper Single Bond 2/Filtek Z350 were placed. After 24 hours, 1 mm2 beams were obtained from each block to be tested with the microtensile bond strength test (50 N load at 0.5 mm/minute). The data were statistically analyzed by one-way RM-ANOVA and Tukey's tests (alpha = 0.05). RESULTS: No difference was detected among the ABR, ERO, and CONT groups (P > 0.05). ERO+ABR group yielded lower bond strengths than either the ABR and ERO groups (P < 0.0113). / Revisión por pares Acid Etching, Dental Animals Bisphenol A-Glycidyl Methacrylate Carbonated Beverages Cattle Composite Resins Dental Bonding Dental Enamel Dental Materials Dental Stress Analysis Dentin-Bonding Agents Humans Microscopy, Electron, Scanning Phosphoric Acids Stress, Mechanical Surface Properties Tensile Strength Time Factors Tooth Abrasion Tooth Erosion Toothbrushing

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Role of chlorhexidine in bond strength to artificially eroded dentin over time.

Effect of simulated intraoral erosion and/or abrasion effects on etch-and-rinse bonding to enamel.