为避免损伤牙龈组织,上颌前牙区舌侧基托边缘应远离龈缘 ( )A.4~6mm B.1~2mm C.6~8mm D.3~4mm E.2~3mm

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问题 为避免损伤牙龈组织,上颌前牙区舌侧基托边缘应远离龈缘  (    )

选项 A.4~6mm
B.1~2mm
C.6~8mm
D.3~4mm
E.2~3mm

答案A

解析
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