Abstract: PURPOSE: The purpose of the study was to investigate the clinical effect and implementation method of mandibular molar implantation using a CT machine combined with Simplant software so as to provide a safer and more reliable method for preoperative preparation of mandibular molar implantation. METHODS: CT/cone-beam CT (CBCT) examinations were applied among 10 cases selected into the study. The Simplant software was used to measure the distances between implantation point center and superior wall of inferior alveolar nerve canal (H1), buccolingual diameter (H2), mesiodistal diameter (H3), ginginal thickness(H4) and occlusal distance (H5). Simplant software was also applied to calculate the bone mineral density of implantation areas and trace the inferior alveolar nerve canal. RESULTS: H1 was between 10.7 mm-17.6 mm, H3 was between 5.4mm-8.3mm.The 10 selected cases undertook implantations according to the results of simulation and all of them succeed after a one year's clinical follow-up. CONCLUSIONS: According to its accuracy in measuring data of the implantation area, Simplant software can be routinely used in preoperative preparation of mandibular molar implantation, which will make the process safer and more controllable.

Key words: Simplant software, Implantation, Operation simulation