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ORIGINAL ARTICLE
Year : 2013  |  Volume : 4  |  Issue : 1  |  Page : 20-26

Shear bond strength and SEM morphology evaluation of different dental adhesives to enamel prepared with ER:YAG laser


1 Department of Operative Dentistry, Faculty of Dentistry, University of Porto, Porto, Portugal
2 Biomaterials Laboratory, Faculty of Dentistry, University of Lisbon, Lisbon, Portugal
3 Charité University in Berlin, Germany, Clinical MKT Dentist at Dentsply DeTrey, Konstanz, Germany

Correspondence Address:
Patrícia T Pires
Department of Operative Dentistry, Faculty of Dentistry, University of Porto, Porto
Portugal
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0976-237X.111588

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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.


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