root groove deformity 畸形根面沟
T-root groove T型叶根槽
cervical nerve root groove 颈神经根槽
groove-root diameter 槽底内径
Vee groove with root face 单纯边的V形坡口
single-Vee groove with root face 单纯边的V形坡口
single-V groove with root face 单钝边V形坡口
double-V groove with root face 带钝边X形坡口
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