一、前 言 目前对牙缺失的修复有陶瓷牙、塑料牙、工程塑料牙、金属牙等,现用材料各有其利弊。陶瓷牙硬度大,耐磨损,强度好,但脆性较大,加工困难,与义齿基托无粘结力,且釉面磨损后不能抛光。塑料牙与陶瓷牙相反,脆性小,加工容易,能与义齿基托粘结,抛光性能好,但硬度小,耐磨性差。而工程塑料牙如聚碳酸酯、尼龙、聚氨基甲酸酯 First, the preface At present, the repair of missing teeth with ceramic teeth, plastic teeth, plastic teeth, metal teeth, the active material has its own advantages and disadvantages. Ceramic tooth hardness, wear resistance, good strength, but more brittle, processing difficulties, and denture base without adhesion, and glazed wear can not be polished. Plastic teeth and ceramic teeth on the contrary, the brittleness is small, easy to process, can be bonded with the denture base, polishing performance, but the hardness is small, poor wear resistance. The engineering plastic teeth such as polycarbonate, nylon, polyurethane