Kinoshita S, Arai T, Uraguchi R
Bull Tokyo Med Dent Univ. 1979 Sep;26(3):225-42.
This study was conducted to examine the effect of various dentifrices on the abrasion of acrylic resin and extracted human tooth. The influence of the difference in the hardness of the filament of the toothbrush on the abrasion was also studied, using three kinds of toothbrushes. The specimens (acrylic resin and extracted human tooth) were brushed 3,000 times by the back- and -forth stroke movement using a toothbrushing machine for two hours. The surface irregularities of the specimen were analyzed by the surface analyzer and observed by the scanning electron microscopy before and after the brushing procedure. Moreover, the weight loss of the test specimens of the acrylic resin materials was determined, weighing them by a microbalance before and after brushing. The abrasiveness of the dentifrices showed a wide range, but the abrasiveness of the toothbrush itself was not observed. All dentifrices except one which did not contain the abrasive materials had abrasive effects on both the acrylic resin and human tooth. There was a high correlation (r = 0.96) between the weight loss and the surface irregularities in the case of acrylic resin.
本研究旨在考察各种牙膏对丙烯酸树脂和拔除的人牙磨损的影响。还使用三种牙刷研究了牙刷刷毛硬度差异对磨损的影响。使用刷牙机以来回摆动的方式对标本（丙烯酸树脂和拔除的人牙）进行3000次刷牙，持续两小时。在刷牙前后，通过表面分析仪分析标本的表面粗糙度，并通过扫描电子显微镜进行观察。此外，通过在刷牙前后用微量天平称重来测定丙烯酸树脂材料测试标本的重量损失。牙膏的磨损性范围很广，但未观察到牙刷本身的磨损性。除一种不含研磨材料的牙膏外，所有牙膏对丙烯酸树脂和人牙均有磨损作用。在丙烯酸树脂的情况下，重量损失与表面粗糙度之间存在高度相关性（r = 0.96）。
