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In vitro microtensile bond strength of a universal adhesive system to dentin using etch-and-rinse and etch-and-dry technique
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Objectives: The purpose of the present study is to compare the immediate microtensile bond strengths (μTBS) of one universal adhesive applied to dentine according to the etch-and-rinse and the self-etch technique. The null hypothesis tested was that the bonding effectiveness to dentin was not affected when the adhesive was applied either following an etch-and-rinse or etch-and-dry technique. Methods: Six recently extracted human third molars, intact and without macroscopic evidence of caries or restorations, were assigned to two groups according to the etching strategy: Group SBU TE D – Scotchbond Universal Adhesive (3M ESPE) applied as a 2-step etch-and-rinse adhesive on moist dentin; Group SBU SE D - Scotchbond Universal Adhesive applied as a 1-step self-etch adhesive on dentin. 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 paired-sample t-test was performed when the assumption of normality was valid. Results: The mean μTBS to dentin of the Scotchbond Universal Adhesive applied following the etch-and-dry approach (SBU SE D) was statistically higher than that when the SBU was applied following the etch-and-rinse approach (SBU TE D) (p = 0,008). Conclusions: Within the limitations of the present laboratory study, it may be concluded that improved bonding effectiveness of SBU on dentin is obtained when the adhesive is applied with the self-etch approach. The etch-and-rinse approach tested (wet dentin) resulted in immediate bond strength statistically lower than the self-etch group.
Descrição
Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2014
Palavras-chave
Adesivos dentários Teses de mestrado - 2014