Evaluation of different mechanical surface treatments in tensile strength of direct<br /> composite resin repairs
Journal Title: RSBO - Year 2005, Vol 2, Issue 1
Abstract
The aim of this study was to compare the effect of different mechanical surface treatments in the tensile strength of direct composite resin repairs. 12 specimens were obtained in halter form, for the control group, and 24 in hemi-halter form for the other experimental groups. The specimens were stored for 30 days in artificial saliva before being repaired. The experimental groups were repaired after the mechanical surface treatment,through the mechanical retentions in the repairing surface, and also after the surface roughening with an air abrasion system. After mechanical treatment, the surface was etched with phosphoric acid and the adhesive system was used without a previous photo polymerizing to the repair material addition. After the tensile strength test it was observed that the group treated by macro-mechanical retentions presented significantly inferior strength values compared to the control group. Moreover, there were not observed significant differences among repaired groups,regardless mechanical surface treatment. Based on the results it was possible to conclude that air abrasion provided strength values in composite resin repairs similar to cohesive strength.
Authors and Affiliations
Daniela MINATTI, Celso YAMASHITA, Luciano MADEIRA
Keywords
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