Effects of Chairside Polishing and Brushing on SurfaceRoughness of Acrylic Denture Base Resins

• Published in: Journal of Wuhan University of Technology. Materials science edition 2009, Vol.24 (1), p.100-105
• Main Author: Seung-Kyun Kim Ju-Mi Park Min-Ho Lee Jae-Youn Jung Shipu Li Xinyu Wang
• Format: Article
• Language: English
• Subjects: 丙烯酸树脂; 原子力显微镜; 扫描电子显微镜; 机械抛光; 磨损试验机; 聚合树脂; 表面粗糙度
• ISSN: 1000-2413; 1993-0437

The effects of 3 chairside polishing kits and mechanical brushing on the surface roughness of 3 different acrylic denture base resins were compared. Acrylic denture base resins （auto-polymerizing, heat-polymerizing, injected heat-polymerizing resins） were examined after a tungsten carbide bur, and after chairside polishing using 3 polishing kits and pumice. The specimens were subjected to mechanical brushing using a wear tester to simulate 30 000 strokes of brushing. The surface roughness of the acrylic denture base resin specimens was measured using a contact pro-filometer. After the test, the random polished acrylic resins were evaluated by scanning electron mi-croscopy （SEM） and atomic force microscopy （AFM）. Acrylic denture base resins polished using the 3 types of polishing kits had a smoother surface than those finished with the tungsten carbide bur （p〈0.05）. The surface of the resin polished by a TC cutter exceeded the Ra of 0.2 μm （p〈0.05）. The auto-polymerizing resin showed a significantly higher surface roughness than the heat-polymerizing resin and injected heat-polymerizing resin （p〉0.05）. In the case of polishing step wise, there was almost no change in surface roughness after brushing （p〉0.05）.