PURPOSE: The aim of this study was to investigate the influence of testing speed on the microtensile bond strength values of two adhesive systems to dentin. MATERIALS AND METHODS: A flat dentin surface was exposed after grinding the occlusal enamel of 10 human third molars. The adhesive systems (n = 5 each) Single Bond and Clearfil SE Bond were applied according to the manufacturers' instructions, and composite resin crowns (Z250) were constructed incrementally. After 24 h in distilled water at 37 degrees C, each tooth was longitudinally sectioned in both the x and y directions, under a cutting speed of 300 rpm, to obtain sticks with a cross-sectional area of 0.8 mm2. The sticks from each tooth were divided into 5 groups to be tested under crosshead speeds of 0.1, 0.5, 1.0, 2.0, and 4.0 mm/min. The fracture pattern was analyzed microscopically after debonding (400X). A two-way ANOVA having adhesive system (2 levels) and testing speed (5 levels) as main factors was used to compare the microtensile bond strengths. RESULTS: The two-way ANOVA did not detect statistically significant differences either for the interaction (p = 0.80) or for the crosshead speed (p = 0.69). Differences were only detected between adhesive systems (p = 0.001), with Single Bond showing higher bond strength values than Clearfil SE Bond. CONCLUSION: The crosshead speed used for microtensile bond strength tests does not influence the bond strength values, regardless of the adhesive system employed.
PURPOSE: The aim of this study was to investigate the influence of testing speed on the microtensile bond strength values of two adhesive systems to dentin. MATERIALS AND METHODS: A flat dentin surface was exposed after grinding the occlusal enamel of 10 human third molars. The adhesive systems (n = 5 each) Single Bond and Clearfil SE Bond were applied according to the manufacturers' instructions, and composite resin crowns (Z250) were constructed incrementally. After 24 h in distilled water at 37 degrees C, each tooth was longitudinally sectioned in both the x and y directions, under a cutting speed of 300 rpm, to obtain sticks with a cross-sectional area of 0.8 mm2. The sticks from each tooth were divided into 5 groups to be tested under crosshead speeds of 0.1, 0.5, 1.0, 2.0, and 4.0 mm/min. The fracture pattern was analyzed microscopically after debonding (400X). A two-way ANOVA having adhesive system (2 levels) and testing speed (5 levels) as main factors was used to compare the microtensile bond strengths. RESULTS: The two-way ANOVA did not detect statistically significant differences either for the interaction (p = 0.80) or for the crosshead speed (p = 0.69). Differences were only detected between adhesive systems (p = 0.001), with Single Bond showing higher bond strength values than Clearfil SE Bond. CONCLUSION: The crosshead speed used for microtensile bond strength tests does not influence the bond strength values, regardless of the adhesive system employed.
Authors: Andrea M Andrade; Eugenio Garcia; Sandra Kiss Moura; Alessandra Reis; Alessandro Loguercio; Luciana Mendonça Silva; Gustavo H D Pimentel; Rosa Helena Miranda Grande Journal: Int J Dent Date: 2012-11-04
Authors: Mariana Almeida Mello Proença; Karime Tavares Lima da Silva; Alisson Costa E Silva; Edilausson Moreno Carvalho; José Bauer; Ceci Nunes Carvalho Journal: Int J Dent Date: 2020-02-17