Avaliação in vitro da rugosidade superficial da resina composta após escovação simulada com diferentes escovas e imersão em bebida ácida

Abstract

The objective of this study is to verify the influence of composite resins because of the brushing and common drinks in the patients routine. For this purpose, composite resin samples (n = 66) were made that went through specific machine brushing cycles (in vitro) associated with moments of immersion in beverages with different levels of acid content. The polishing protocol was performed by uniformity the surfaces with abrasive discs and polishing with specific rubbers. Samples were randomly distributed into 6 groups: G1 – Artificial Saliva and hard brush (Sorriso), G2- Artificial Saliva and soft brush (Colgate), G3- Artificial Saliva and extra soft brush (Elmex), G4- Coca-Cola and hard brush (Sorriso), G5- - Coca-Cola and soft brush (Colgate), G6-- Coca-Cola and extra soft brush (Elmex). After immersion in beverages, each group was submitted to an abrasive process (accelerated brushing) with a constant applied load of 200g, and a dentifrice (Colgate Total 12) with proportions 1: 2 weight (90g dentifrice with 180mL distilled water) for 6.000 cycles, corresponding to 6 months of normal brushing. Each cycle was counted after the brush movement. The samples were subjected to roughness analysis and scanning electron microscopy before and after immersion and brushing accelerated aging. The results were submitted to analysis of variance and association with microscopy images. The highest average surface roughness was obtained with the hard brush (Sorriso) immersed in saliva and Coca-Cola. The Colgate group behaved statistically similar to Elmex immersed in saliva. Already immersed in Coca-Cola, the Colgate group behaved statistically similar to both Smile and Elmex. It was concluded that the surface roughness of the composite resins increased with the brushing time and there was no statistical difference between immersion in artificial saliva and Coca-Cola in the 6 months simulation.