• Oliveira, S.
• Azevedo, Á.
• Dias, W.
• Ferreira, J.
• Pires, P.
• Melo, P.

Abstract

Context: Early observations of enamel surfaces prepared by erbium lasers motivated clinicians to use laser as an alternative to chemical etching. Aims: Evaluate shear bond strength (SBS) values of different dental adhesives on Erbium:Yttrium Aluminum Garnet (Er:YAG) laser prepared enamel and to evaluate possible etching patterns correlations between dental adhesives and SBS values. Subjects and Methods: One hundred bovine incisors were randomly assigned to SBS tests on enamel (n = 15) and to enamel morphology analysis ( n = 5) after Er:YAG laser preparation as follows: Group I-37% phosphoric acid (PA)+ ExciTE®; Group II-ExciTE®; Group III-AdheSE®self-etching; Group IV-FuturaBond®no-rinse. NR; Group V-Xeno®V. Teeth were treated with the adhesive systems and subjected to thermal cycling. SBS were performed in a universal testing machine at 5 mm/min. Statistical Analysis Used: One-way ANOVA and post-hoc tests (p < 0.05). For the morphology evaluation, specimens were immersed in Ethylenediamine tetraacetic acid (EDTA) and the etching pattern analyzed under Scanning Electron Microscope (SEM). Results: Mean bond strengths were Group I-47.17 ± 1.61 MPa (type I etching pattern); Group II-32.56 ± 1.64 MPa, Group III-29.10 ± 1.34 MPa, Group IV-23.32 ± 1.53 MPa (type III etching pattern); Group V-24.43 MPa ± 1.55 (type II etching pattern). Conclusions: Different adhesive systems yielded significantly different SBSs. Acid etching significantly increased the adhesion in laser treated enamel. No differences in SBS values were obtained between AdheSE®and ExciTE®without condition with PA. FuturaBond®NR and Xeno®V showed similar SBS, which was lower in comparison to the others adhesives. No correlation between enamel surface morphology and SBS values was observed, except when PA was used.

Topics

• morphology
• surface
• scanning electron microscopy
• aluminium
• strength
• etching
• Yttrium
• Erbium