Caracterização estrutural de borrachas polidoras: tipo, tamanho, formato e distribuição de partículas durante o envelhecimento mecânico e processo de autoclavagem

Abstract

Composite resin, as a restorative material that provides function reestablishment and good aesthetic, request a good finishing and polishing to be longevous and to not compromise adjacent periodontal tissues health. Among polishing materials, there are rubber cups, that may be cleaned and sterilized. However, is not known what effect autoclaving process does on that. On this way, this study objective was to perform structural characterization of composite polishing systems and its structural effects related to autoclaving cycles aging on composite resin polishing. Three different polishing systems were used on cup morphology. An own matrix was made to the samples obtaining (n=10), that were roughened and polished for each autoclaving cycle, remaining each polisher to the same composite sample. After storage, each sample group was submitted to polishing procedures of its respective polisher. Polisher analysis was performed by Scanning Electronic Microscopy (SEM) and weighing on analytic digital balance to analyze the agreeged particles and note, quantitatively, the structure loss of the rubber polishers between autoclaving process. The proof bodies analysis was done by Profilometer, to verify the surface roughness provided by the polishing systems along polishing procedures. Obtained data, were submitted to statistical analysis. No difference was observed in relation to weighing on analytic digital balance on same trade mark polishers after autoclaving cycles. On qualitative analysis by SEM, was observed that Jiffy (Ultradent) polisher suffered large matrix deterioration, occasioned by bubbles and space appearance, while Opti-1 step (Kavo Kerr) and Viking (KG Sorensen) was observed a greatest particle exposure, what mays increase this polisher’s performance. On a quantitative analysis by surface roughness test with Profilometer, was observed that Jiffy’s polished composite resins increased the surface roughness values as this polisher suffered autoclaving process, whereas Opti-1 step and Viking provided lower surface roughness on composite resin samples as were autoclaved. It can be concluded that autoclaving process may affect rubber, some in a positive way, with the larger particle exposure, increasing polishing power, and in the other ones, in a negative way, inducing a matrix modification, favoring particle loss, what may decrease the polishing power. Polished resins with some systems, showed rougher surfaces after its polisher suffered autoclaving cycles.