Abstract
The purpose of this study was to examine the influence of various mouthrinses on impacting-slidingcharacteristics of bovine enamel. Thirty bovine mandibular incisors were mounted in self-curing resin and thefacial enamel surfaces were wet ground with #2,000 SiC paper. Solutions of five mouthrinses: ConCool F (CF,pH5.4), Check-UP (CU, pH5.8), Listerine (LR, pH4.2), Listerine Zero (LZ, pH4.2), Shumitekuto (SH, pH6.8), and distilled water (DW, pH7.2) as a control were used. The enamel specimens immersed in one of the solutions were subjected to the impacting-sliding wear test using stainless steel antagonist tips up to 1,000 cycles, after which the wear loss was recorded. Furthermore, specimen surfaces were observed using 3D laser scanning microscopy and scanning electron microscopy. Knoop hardness measurement of the enamel surface was also conducted. The wear loss ranged from 7.5 to 24.3×104 μm3 for the 100-cycle group, from 11.8 to 80.9×104 μm3 for the 500-cycle group, and from 16.2 to 137.8×104 μm3 for the 1,000-cycle group. Acidic mouthrinses (LR and LZ) showed significantly higher wear loss compared to the other mouthrinses (p<0.05). Lower Knoop hardness was detected for the specimens immersed in LR and LZ solutions compared to the other solutions. These results implied that the impacting-sliding enamel wear differed according to the chemical components and pH of the mouthrinses used. It was also suggested that various wear mechanisms such as adhesive wear and tribochemical wear were involved in the impacting-sliding enamel wear.