Abstract
Witkop定義牛狀齒(taurodontism)比正常牙齒有較大的牙髓腔，齒頸部收縮不明顯，從牙根分叉處到牙骨質－牙釉質交界cementoenamel junction(CEJ)距離大於咬合面到齒頸部距離。牛狀齒在恆齒與乳齒發生率都很低，一般來說恆齒比乳齒常見。牛狀齒特殊複雜的根管型態，大大地影響根管的成功率，所以根管治療就變成一種挑戰。本病例是一位6歲的小男生，由其他診所轉來，家長主訴多次治療都無法改善右下第二大臼齒頰側黏膜發炎現象。X光片上呈現上下兩側臼齒都為牛狀齒。經過治療後的3個月回診，在臨床和X光片上都有良好的預後。牛狀齒有更多的根管數及深長的牙髓腔，特殊複雜的根管型態，增加治療的困難度。牙醫師應該認識牛狀齒，在治療計畫和方式上要謹慎考量。
Published Version
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