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Augmented Corticotomy-Assisted Presurgical Orthodontics of Class III Malocclusions: A Cephalometric and Cone-Beam Computed Tomography Study

Wang, Bo DDS, MSD*; Shen, GuoFang DDS, PhD; Fang, Bing DDS, PhD*; Yu, HongBo DDS, MSD; Wu, Yong DDS, MSD*

Journal of Craniofacial Surgery:
doi: 10.1097/SCS.0b013e3182a245b3
Original Articles
Abstract

Objective: The purpose of this study was to evaluate mandibular incisor decompensation and the surrounding periodontal status with augmented corticotomy-assisted presurgical orthodontics of class III patients.

Methods: Fifty-six surgical class III patients were enrolled in this study, 26 of whom chose augmented corticotomy-assisted presurgical orthodontics (G1), and 30 chose conventional procedures (G2). Cone-beam computed tomography images and lateral cephalograms were obtained from each patient before and after presurgical orthodontics. Measurements of variables were compared using Student t tests and separate variance estimation t tests.

Results: The amount of mandibular incisor decompensation and the increase in labial alveolar bone thickness in G1 were greater than those in G2 during presurgical orthodontics (P < 0.001), however, root resorption (P < 0.001), the decrease in lingual alveolar bone thickness (P < 0.001), and vertical alveolar bone loss on both labial (P < 0.05) and lingual sides (P < 0.001) were less in G1 than in G2.

Conclusions: Sufficient mandibular incisor decompensation and better periodontal preservation were achieved with augmented corticotomy-assisted presurgical orthodontics for class III patients compared with traditional procedures.

Author Information

From the *Center of Cranio-facial Orthodontics and †Department of Oral and Maxillofacial Surgery, College of Stomatology Affiliated 9th People’s Hospital, Shanghai Jiao Tong University, Shanghai Key Laboratory of Stomatology, Shanghai, People’s Republic of China

Received February 26, 2013.

Accepted for publication May 27, 2013.

Address correspondence and reprint requests to Bing Fang, DDS, PhD, Center of Cranio-facial Orthodontics, College of Stomatology Affiliated 9th People’s Hospital, Shanghai Jiao Tong University, Shanghai Key Laboratory of Stomatology, Room 405, Bldg 1, 639 Zhi Zao Ju Rd, Shanghai 200011, People’s Republic of China; E-mail: doctorfangbing@hotmail.com

This work is supported by National Nature Science Foundation of China (10972142), Research Fund of Science and Technology Commission of Shanghai Municipality (08411961600), and Program for Innovative Research Team of Shanghai Municipal Education Commission.

The authors report no conflicts of interest.

© 2013 by Mutaz B. Habal, MD.