塑脂冠是一种传统修复体,但易磨损,边缘不密合及色泽不稳定。而金瓷冠瓷脆易裂,对(牙合)天然牙磨损较大,并要求金属与瓷的热膨胀系数相似和较瓷高的溶点。光固树酯冠是一种新型修复材料,具有下列优点:〈1〉色泽稳定有利美观,〈2〉耐磨性与天然牙相似,〈3〉与口腔组织生物相容性好, Plastic crown is a traditional restoration, but easy to wear, the edge is not close and the color is not stable. The porcelain porcelain porcelain brittle crack, on the (occlusal) natural teeth wear larger, and requires the thermal expansion coefficient of metal and porcelain similar and higher porcelain melting point. Photoresist crown is a new prosthetic material with the following advantages: <1> stable and favorable color appearance, <2> abrasion resistance similar to natural teeth, <3> good biocompatibility with oral tissues,