The abrasiveness by modern dentifrices (author's transl)

Abstract

This study was performed to examine the effect of modern dentifrices on the abrasion of acrylic resin and human teeth.Those specimens were brushed with a tooth brushing machine for two hours, corresponding to 3000 back and forth strokes. The surface irregularities of the specimen were analyzed by a surface analyzer, and observed by scanning electron microscopy before and after the brushing procedure. The weight loss of the test specimens of acrylic resin materials was determinded, weighing them before and after brushing by a microbalance.The effect of hardness of toothbrush on the abrasion was tested, using three different toothbrushes.The abrasiveness by the dentifrices showed a wide range.All dentifrices except one dentifrice which did not contained abrasive materials had considerable abrasive effects on both acrylic resin and human teeth. There was a high correlation (r=0.96) between the weight loss and the surface irregularities in the case of acrylic resin.Without using dentifrices, abrasion was not observed on both acrylic resin and human teeth.