现在广泛使用金属支架和丙烯酸塑料牙面联合制作的固定义齿,因塑料牙面迅速磨损和颜色常发生变化而不能令人满意。为研究这种变化的原因,作者检查因各种原因而拆下的这类义齿56件,使用期限2～5年以上。制成磨片,用显微镜检查塑料的结构,特别是和金属邻接处。经显微镜检查选出需要测定塑料化学结构的区域,用激光照射使少量物质(1mg)蒸 The widespread use of fixed dentures made of metal stents and acrylic plastic dental surfaces is now unsatisfactory due to rapid wear of plastic dental surfaces and frequent changes in color. To study the causes of this change, the authors checked 56 such dentures removed for various reasons over a period of 2 to 5 years. Made of grinding, check the plastic structure with a microscope, especially with the metal adjacent. The microscopic examination of the need to determine the chemical structure of the plastic area, a small amount of laser irradiation (1mg) steam