Objectives: Stability of orthodontic micro implants depends on the amount and the quality of bone The aim of our study was to investigate the suitability of the mandibular alveolar process for the placement of micro implants using dental computed tomography (CT). Patients and Methods: 51 dental CTs of 51 patients who underwent the examination before osteotomy of third molars ( average age 24.0 ± 8.1) were investigated. Total bone amount was assessed measuring the breadth of the alveolar process, the interradicular distances, and the thickness of the cortical bone layer at the crestal and apical level. Additionally the Canalis alveolaris could be identified. Results: At the crestal level the average orovestibular diameter of the alveolar process was 5.1 ± 1.2mm in the anterior region and increased to more than 15mm between the second and third molar. The apical breadth of the alveolar process varied between 7.2 ± 0.9mm ( anterior) and 13.9 ± 2.3mm between the second and third molar. Interradicular distances were generally below 2mm at the crestal level and had a peak of 4.4mm between the apices of the second and third molars. The largest distance was found between the premolars at the Foramen mentale. Average thickness of the cortical bone layer varied between 0.9 and 2.7mm. Conclusion: Quality and amount of bone seem to be generally sufficient for implant placement in the apical region distal from the second premolar. Contraindications are between both premolars due to the Foramen mentale. Exact radiographic examination should precede interradicular implants mesial from the canines.

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