烤瓷全冠牙体预备时应尽量保证的颊侧肩台宽度为A.0.5mmB.1mmC.2mmD.2.5mmE.3mm

作者: tihaiku 人气: - 评论: 0
问题 烤瓷全冠牙体预备时应尽量保证的颊侧肩台宽度为
选项

A.0.5mm
B.1mm
C.2mm
D.2.5mm
E.3mm

答案 B
解析 烤瓷全冠牙体预备时,颊侧肩台宽度为1mm。牙体各轴壁预备出金属厚度的间隙约0.5mm,以及瓷的厚度0.85~1.2mm。前牙切端或后牙牙合面应至少预备出2.0mm的间隙。悬空式桥体:桥体的龈面与牙槽嵴不接触,距牙槽嵴顶有约3mm以上的空隙,且桥体龈面呈凸圆形,利于食物流通而不积聚,自洁作用较好,故又称为卫生桥。

相关内容:烤瓷,全冠,牙体,预备,时应,颊侧,肩台,宽度,A.0.5mmB.1mmC.2mmD.2.5mmE.3mm

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