This study investigates the effect of smokeless tobacco on the tribological properties of two commercially used dental composite materials: Tetric N-Ceram and Z350 Dentin shade. It is to evaluate the effect of smokeless tobacco on the wear properties of two dental composite materials after some stipulated period. The wear test was conducted on pin-on-disk tribometer in the presence of artificial saliva under different loading conditions of 10, 15 and 20 N. The pins of the dental composite material were immersed in tobacco solution. The tribological behavior was studied after 2 days, 3.5 days, 6 days, 15 days and 1 month which represented the real conditions for the contact of 1 week, 2 weeks, 1 month, 2 months and 5 months, respectively, between the dental material and the tobacco solution. Under different loading conditions, Z350 Dentin material exhibited much less wear than the Tetric N-Ceram material in the presence of synthetic saliva for the specimen with or without tobacco immersion. The microstructure of the pin surface was inspected using scanning electron microscopy.

本研究调查了无烟烟草对两种商用牙科复合材料（Tetric N-Ceram 和 Z350 Dentin Shade）摩擦学特性的影响。旨在评价无烟烟草在一定时间后对两种牙科复合材料磨损性能的影响。在人造唾液存在下，在10、15和20 N的不同负载条件下，在销盘摩擦计上进行磨损测试。将牙科复合材料的销浸入烟草溶液中。在 2 天、3.5 天、6 天、15 天和 1 个月后研究摩擦学行为，分别代表牙科材料之间接触 1 周、2 周、1 个月、2 个月和 5 个月的真实条件和烟草溶液。在不同的负载条件下，在有或没有烟草浸泡的样本存在合成唾液的情况下，Z350 Dentin 材料表现出比 Tetric N-Ceram 材料少得多的磨损。使用扫描电子显微镜检查销表面的微观结构。