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Updated: May 10, 2025
A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
Published on: January 28, 2020
Evaluation of optimal parameters for the insertion of mini-implants at the mandibular ramus region based on cone-beam
Qi Fan1, Shangyou Wen1, Xuechun Yuan1
1Department of Orthodontics, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Chengdu 610041, China.
Objective:
To determine the optimal parameters for mini-implant placement in the mandibular ramus.
Material And Methods:
Measurements were conducted on CBCT data from 50 subjects, covering five planes (OP2, OP4, OP6, OP8 and OP10), each with six sites (Site0, Site2, Site4, Site6, Site8 and Site10), and each site with five insertion angles (30°, 60°, 90°, 120°, and 150°). The data included measurements of bone depth, cortical bone thickness, canal distance, and the probability of molar interference.
Results:
The bone volume of the mandibular ramus is sufficient for placing orthodontic mini-implants. When mini-implants were implanted at appropriate heights, sites, and angles, contact with the mandibular nerve canal and interference with maxillary molars can be avoided.
Conclusions:
Suitable insertion height was 4-8mm above the occlusal plane. Suitable insertion site was 4-8mm medial to the external oblique ridge. Suitable insertion angle was 120-150 degrees with the anterior surface of the mandibular ramus platform.
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