A computerized tomographic study on the location of the mandibular canal and the cortical thickness of the mandible / 대한구강악안면방사선학회지

ABSTRACT

The location of the mandibular canal and the cortical thickness of the mandible is important in the practice of de ntistry. This study was preformed on twenty chosen dry mandibles, which were of adults and included fully erupted premol ars and molars. The purpose of this study was to evaluate the location of the mandibular canal and the cortical thikness of the mandi ble on computed tomograms and to aid in the surgical treatment plans. The obtained results were as follows : 1. The horizontal distance between the mandibular canal and the buccal external border was 6.6+/-0.9mm on S0( mesial root of the first molar), and it was increased posteriorly. The horizontal distance between the mandibular canal and the lingual external border was 4.1+/-1.1mm on S0, and it was decreased posteriorly. 2. The vertical distance between the alveolar crest and the mandibular canal was 16.9+/-1.6mm on S0, and it w as decreased posteriorly. The vertical distance between the inferior border of mandible and mandibular canal was 8.8+/-1. 3mm on S0. and it was increased anteriorly and posteriorly. 3. The thickness of the buccal cortical plate was 2.2+/-0.4mm on S0. and it was increased posteriorly. But, t hat of the lingual cortical palte was 2.0+/-0.6mm on S0. and it was decreased posteriorly. 4. The area of the buccal cortical plate was 66.5+/-1.0mm2 on S0. and it was increased posteriorly . But, that of the lingual cortical plate was 65.8+/-0.9mm2 on S0 and it was decreased posteriorly.