26.關於齒槽骨分段手術（repositioning alveolar segments）的敘述，下列何者錯誤？
(A)較佳的分段手術，距離是3顆牙或3顆以上
(B)以單顆牙齒分段手術，後續較容易出現問題
(C)根尖下截骨術會切斷這區域連接至牙髓的神經
(D)這一區段的牙齒大部分都要根管治療

課本在第20章的Repositioning Alveolar Segments小節中提到:

a three-tooth or larger segment is preferred, a two-tooth segment is acceptable but less predictable, and a one-tooth segment is a problem waiting to occur.較佳的分段手術,距離是3顆牙或3顆以上，兩顆是可接受但難以預測，單顆牙就等著出問題。因此A跟B選項正確。

An osteotomy below the root apices cuts the nerves to the pulp of the teeth in that segment, and of course there is no collateral innervation.根尖下截骨術會切斷這區域連接至牙髓的神經，C正確

Even though the major vessels to the tooth pulp are cut, less than 2% of the involved teeth require endodontic treatment.即便接到牙髓的主要血管被切斷，也只有不到2% 的牙齒需要做RCT。D選項錯誤。