题目内容
(请给出正确答案)
[主观题]
龈谷gingival col
提问人:网友winstars
发布时间:2022-01-06
The two major problems with posterior composite resin materials are()
A.wear resistance
B.bulk fracture due to lack Of tensile strength
C.difficulty in attaining a good proximal contact
D.difficulty in sealing the gingival margin of a classⅡpreparation
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