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Influence of the timing of saliva contamination on the adhesion to zirconia
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Purpose: The purpose of the present study was to evaluate the ability to promote adhesion of two luting materials to saliva contaminated zirconia, according to the following null hypothesis: 1) the adhesive system does not influence bond strength to zirconia; 2) the timing of saliva contamination does not influence the bond strength to zirconia. Materials and Methods: Sixty blocks of zirconia were randomly assigned to six experimental groups, according to the possible combinations between luting materials (OptiBond XTR + NX3 Nexus / Futurabond M+ + Bifix QM) and saliva contamination conditions (no contamination / contamination after the adhesive application / contamination prior to the adhesive application) (n=10). Previously polymerized composite disks were then seated onto the luting material and the set was light-cured, according to manufacturer’s instructions. Specimens were then stored in distilled water at 37ºC for 48 hours. Shear bond strength (SBS) tests and failure mode analysis were performed. SBS data were analysed by two-way ANOVA, followed by Tukey-HSD post-hoc tests, and failure mode by Krustal-Wallis and Mann-Whitney tests (α=0.05). Results: SBS mean values ranged from 12.2 MPa to 22.0 MPa. The groups subjected to no contamination or contamination prior to the adhesive system application yielded a significantly (p<0.05) higher SBS than the other contamination condition. The luting materials used did not statistically influence SBS (p=0.187). Failure mode was influenced by contamination conditions (p=0.007), but no difference was found between luting materials (p=1.000). Conclusions: Despite the luting materials did not influence bond strength to zirconia, the timing of saliva contamination did. To rinse saliva contaminated zirconia surfaces seems to be an effective method for saliva decontamination. However, the adhesive system used combined with cements should be applied before try-in.
Descrição
Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2016
Palavras-chave
Materiais dentários Cerâmica dentária Teses de mestrado - 2016