一般基層院所醫師對牙髓病科轉診的原因中，以「根管鈣化」佔最多數，其次為「症狀不消」及「重新治療」。本病例為27歲女性，其右下顎第二大臼齒在治療數次後，因『鈣化根管』原因經牙科診所轉介至醫院牙髓病科要求診治。病人無特殊藥物過敏史，也無其他系統性疾病。經X光及臨床診斷為右下顎第二大臼齒不完全根管治療合併慢性根尖齒周圍炎，其鄰牙及對側左下顎第一大臼齒亦為相同診斷，必須接受根管『重新治療』。經溝通後決定採取非手術性根管治療，同時輔以根管操作型顯微鏡來處理患齒。治療後所有牙齒均獲得保存，且症狀完全消除。

Among the referral reasons of endodontic problems from general dental clinics to the root canal specialties, 'calcified canal' is the number one. Secondly in order is that 'the symptom does not disappear' and 'root canal retreatment'. This case is a 27-year-old woman with calcified root canal of tooth 47 (FDI) underwent root canal treatment at the local dental clinic for several times and transferred to our endodontic department of hospital for further evaluation and treatment. The patient has no known drug or food allergy, and there are no other systemic diseases. After X-ray and clinical examination, the clinical diagnosis was defined as incomplete root canal treatment with chronic apical periodontitis of tooth 47. The same diagnoses were made on its neighbor tooth of 46 and tooth of 36, which needed to be received root canal retreatment. Non-surgical root canal treatment was adopted after communication combined with operative microscope observation. All of teeth were preserved after the above treatment and the symptom is totally dispelled.