Thickness of buccal bone in the mandible and its clinical significance in mono-cortical screws placement. A CBCT analysis

Abstract

The aim of this study was to determine the safest length of monocortical screws that can be inserted for the treatment of mandibular fractures following Champy's technique. Fifty cone-beam computed tomography (CBCT) scans of hemi-mandibles were studied. Linear measurements were taken from the buccal cortical plate to the tooth apex, from the canine to the second premolar, and from the buccal cortical plate to the tooth apex and the inferior alveolar canal in the molar area. The minimum values of the horizontal distances both at the level of the apex and the inferior alveolar canal at the second molar were found to be 4mm, which is greater than those of the first molar. At the canine, first premolar and second premolars, the minimum values of the horizontal distances at the level of the apex was found to be 2mm, 2.33mm and 2mm, respectively. Stabilizing miniplates using 4mm screws both at the level of the apex and the inferior alveolar canal is safe in the second molar area, anterior to this, there is a risk of injury to tooth root and inferior alveolar nerve.