21.口腔內繫帶（frenum）若基底（base）較寬時，下列何種手術方式最適當？
(A)Simple excision technique
(B)Z-plasty technique
(C)Localized vestibuloplasty with secondary epithelialization
(D)Wide dissection

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統計： A(31), B(142), C(290), D(21), E(0) #1032356