Measurement of mandibular incisive canal by cone beam CT

Objective: This study was conducted to measure the mandibular incisive canal (MIC)by cone beam computed tomography (CBCT) and to assess 3-dimensional structure, course and adjacent structure of the MIC, in order to ensure safe region for surgery of the mandibular interforaminal area. Methods: A total of the CBCT images from 83 patients were studied and measured. The detection rates of MIC were calculated The diameter of the MIC and the distances from MIC to the labial and lingual cortices and the inferior border of the mandible and tooth tips were measured at canines and lateral incisors. Results: MIC was found in 67.8% of the patients. In the position of canine, the diameter of MIC, the mean distance of the MIC to the tips of the teeth, to the buccal border of the mandible, to the lingual border of the mandible and the inferior border of the mandible were (1.3 ± 0.4), (8.9 ± 2.9), (4.3 ± 0.9), (5.2 ± 1.1) and (8.6 ± 1.5) mm, respectively. In the position of the incisor, the distance of MIC, the mean distance of the MIC to the tips of the teeth, to the buccal border of the mandible, to the lingual border of the mandible and the inferior border of the mandible were (1.0 ± 0.3), (13.3 ± 4.0), (4.2 ± 0.9), (5.9 ± 0.9) and (8.9 ± 1.8) mm, respectively. Conclusion: CBCT clearly show three dimensional structure, course and adjacent structure of the MIC. Preoperative CBCT can provide vital information for surgery of the mandibular interforaminal area. (authors)