Do enamel microabrasion and casein phosphopeptide-amorphous calcium phosphate affect shear bond strength of orthodontic brackets bonded to a demineralized enamel surface?

Abstract

Objective: To evaluate and compare the effects of enamel microabrasion, casein phosphopeptideamorphous calcium phosphate (CPP-ACP), and their combination on the shear bond strength (SBS) of orthodontic brackets bonded to demineralized enamel surface. Materials and Methods: One hundred human first premolar teeth were randomly allocated to one of five groups. Group I was considered as the control of other groups. For the remaining groups, demineralization was performed via solutions. In group II, brackets were directly bonded to the demineralized enamel surface. CPP-ACP was applied in group III, microabrasion was performed in group IV, and both microabrasion and CPP-ACP application were performed in group V. The specimens were tested for SBS. Bond failures were scored according to the Adhesive Remnant Index (ARI). Analysis of variance and Tukey tests were used to compare the SBS of the groups. ARI scores of the groups were evaluated with a G-test. The statistical significance was set at P ,. 05 level. Results: Statistically significant difference was found among the five investigated groups (F 5 111.870; P , .001). The SBS of groups II and IV were significantly lower than the other groups. No statistically significant difference was found among groups I (control; mean 24.1 6 4.1 MPa), III (mean 22.0 6 3.6 MPa), and V (mean 24.3 6 1.9 MPa). Microabrasion and combination with CPP-ACP showed higher SBS compared to the control group. The differences between ARI scores of the groups were statistically significant (P , .001). Conclusion: CPP-ACP pretreatment, microabrasion of the enamel, and the combination of these two methods improve the bonding to demineralized enamel. (Angle Orthod. 2012;82:36-41.)

Effects of remineralization procedures on shear bond strengths of brackets bonded to demineralized enamel surfaces with self-etch systems

“…This result is in accordance with the study by Baysal and Uysal. 13 On the other hand, in contrast to our study, Sanders et al 21 indicated similar SBS values of orthodontic brackets bonded to microabraded and nonmicroabraded tooth surfaces. The different results may be due to the differences in enamel conditions and abrasives used.…”

“…In the studies mentioned above, natural enamel surfaces were used. On the other hand, Uysal et al 12 compared the effects of fluoride and CPP-ACP and Baysal and Uysal 13 compared the effects of microabrasion and CPP-ACP on the SBS of orthodontic brackets bonded to demineralized enamel and found no significant differences between the control and CPP-ACP groups. In both studies, pretreatment of artificially demineralized surfaces with remineralization procedures appeared to restore decreased SBS values of orthodontic brackets, which is in accordance with the findings of our study.…”

Biofunctional Properties of Caseinophosphopeptides in the Oral Cavity

“…CPP-ACP has been studied mainly with metal brackets to increase SBS. SBS was evaluated with human [Xiaojun et al, 2009;Baysal and Uysal, 2011;Tabrizi and Cakirer, 2011;Uysal et al, 2011] and bovine teeth [Kecik et al, 2008]. An increase in bond strength was found for bovine teeth when applying CPP-ACP paste, fluoride plus CPP-ACP or acidulated phosphate fluoride as compared to the control teeth where no pretreatment was applied [Kecik et al, 2008].…”

Shear strength of orthodontic bracket bonding with GIC bonding agent after the application of CPP-ACPF paste

“…Clinicians can help patients to overcome white spot lesions using some pretreatment procedures on the enamel. 16 Besides, mineral content on enamel may also affect the attachment of orthodontic brackets. On demineralized enamel, for instance because of the presence of caries lesions or post bleaching, the bonding strength of the orthodontic bracket tends to be lower compared to the bracket bonding on normal enamel.…”