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Ethanol wet bonding: an in vitro new approach
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Objetives: The purpose of the present study is to evaluate and compare the immediate resin-dentin bond strength produced by WWB and by an experimental approach of the EWB technique, using microtensile bond strength (μTBS); and to clarify the influence of an experimental primer on the in vitro performance of EWB approach proposed in the present study. The null hypotheses tested were: (1) bonding protocol had no effect on the bond strength; (2) primer application had no effect on the bond strength; (3) there are no differences in the distribution of fractures across all tested groups. Methods: Fifteen recently extracted human molars, intact and without macroscopic evidence of caries or restorations, were assigned to three groups according to the etching strategy: Group WWB (control) – Adper Scotchbond Multipurpose Primer and Adhesive (3M ESPE) applied as a 3-step etch-and-rinse adhesive on moist dentin; Group EWB w/P – experimental series of increasing ethanol concentrations (70% and 96% during 60 seconds)applied, followed by an experimental hydrophobic primer, formulated by diluting 50 wt% Adper Scotchbond Multipurpose Adhesive (3M ESPE) in 96% ethanol; and EWB w/o P – experimental series of increasing ethanol concentrations (70% and 96% during 60 seconds) applied without any primer. The same adhesive was applied in all groups: Adper Scotchbond MultiPurpose (3M ESPE).After resin composite build-ups were performed, the teeth were stored in distilled water in an incubator for 24 hours at 37°C. Specimens were sectioned with a slow-speed diamond saw under water irrigation to obtain bonded sticks that were tested to failure in a universal testing machine at a crosshead speed of 1mm/minute. The statistical analysis of the results was performed with SPSS. A one-way ANOVA test was performed when the assumption of normality was valid. Results: The mean μTBS to dentin of EWB w/ P was statistically similar to WWB (p=0,001). The mean μTBS to dentin of EWB w/o P was statistically lower than both EWB w/P and WWB (p=0,945). Most fractures were adhesives (87,6%) Conclusions: Within the limitations of the present laboratory study EWB w/ P showed similar bonding effectiveness to WWB, after 24 hours. EWB w/o P showed lower bonding effectiveness when compared to the other two groups. There are no differences in the distribution of fractures across all tested groups. Keywords: Dentin bonding, ethanol-wet bonding, microtensile bond strengths.
Descrição
Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2016
Palavras-chave
Materiais dentários Adesivos dentários Teses de mestrado - 2016