Resistência de união ao microcisalhamento entre compósitos restauradores e cimentos resinosos
Journal Title: RSBO - Year 2008, Vol 5, Issue 2
Abstract
Introduction and objective: The techniques of adhesive cementation have been widely used in dental restoration. The purpose of this study was to evaluate the microshear bond strength between restorative composites and resin cements. Material and methods: Twenty composites blocks were prepared in order to obtain a flat surface, using 600-grid sandpaper. The samples were randomly divided in four groups (n=15) according to the experimental groups: [1] Z250 block + Single Bond + cylinder of RelyX ARC; [2] Z250 block + Single Bond + cylinder of Panavia F; [3] Clearfil AP-X block + Clearfil SE Bond adhesive + cylinder of RelyX ARC; [4] Clearfil AP-X block + Clearfil SE Bond adhesive + cylinder of Panavia F. The adhesive systems and the resin cements were applied according to the experimental groups, using a Tygon matrix. The samples were stored in distilled water at 37±2ºC for 24 hours. Microshear bond strengths were determined using an apparatus attached to an Instron universal testing machine at a crosshead speed of 0.5 mm/minute. Results: The results obtained in MPa (SD) were statistically analyzed (ANOVA and Tukey test, p<0.05), and showed the following results: [1] 39.76 (5.34); [2] 45.01 (8.53); [3] 46.39 (9.22); [4] 45.78 (9.06). There was no statistically significant difference between groups [1] and [2]; and between groups [3] and [4]. However, there was statistically significant difference between groups [1] and [3]. Conclusion: When Clearfil AP-X block was used with Clearfil SE Bond adhesive or RelyX resin cement, the microshear bond strength values were higher. The results suggest that in the union of the resin cements to the restorative composites, hydrophobic adhesives are necessary.
Authors and Affiliations
Rubens GARCIA, Mário GÓES, Marcelo GIANNINI
Keywords
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