二次性歯根膜炎を伴う大臼歯再治療失敗例の超微細構造学的検討：歯内療法再治療失敗例における歯内バイオフィルムの検討

Ultrastructural examination of failed molar retreatment with secondary apical periodontitis: an examination of endodontic biofilms in an endodontic retreatment failure.

抄録

歯内療法による再治療に失敗した下顎大臼歯の切除根尖部の光・電子顕微鏡検査を行った。この歯は10年前に初期治療され，2年前に再治療された．切除された根尖は軸方向に切開され、標本の全長にわたって薄切片が検査された。薄切片は透過型電子顕微鏡で観察した。薄切片は中頬側管と中顎側管の間の峡部に沿って無作為に選んだ。その結果、複雑で変化に富んだ多種類のバイオフィルムが、標本の全長にわたって存在していることが示唆された。

A light and electron microscope examination of the resected root tip of a failing endodontically re-treated lower molar was examined. The tooth had been initially treated 10 years ago and then re-treated 2 years ago. The resected root tip was sectioned axially, and thin sections were examined through the entire length of the specimen. Thin sections were examined with a transmission electron microscope. The thin sections were randomly chosen along the isthmus areas between the mesiobuccal and mesiolingual canals. Our findings suggest that a complex, variable, multispecies biofilm was present the entire length of the specimen.