A 颊面近颈部1/3隆起,不应较多地切削 B
颊舌面与邻面相交处制备成圆钝状移行 C
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/2870965_0.jpg">面制备时着重切割<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/2870965_0_1.jpg">面嵴 D
<img border="0" alt="" src="https://img.weimei168.com/uploads/upimg/20230104/2870965_0_2.jpg">面去除1.0mm的牙体表面较好 E
牙颈部不能有台阶