Periodontal micro-osteotomy assisted orthodontic treatment of skeletal Class Ⅲ adults with alveolar hypoplasia in the lower anterior region

Abstract

Abstract: PURPOSE: To investigate the changes of lower incisor proclination and surrounding periodontal condition after periodontal micro-osteotomy assisted orthodontics for skeletal Class Ⅲ malocclusions with alveolar hypoplasia in the lower anterior region. METHODS: The sample consisted of 9 cases diagnosed as severe Class Ⅲ malocclusions with alveolar hypoplasia in the lower anterior region who accepted periodontal micro-osteotomy assisted orthodontic treatment, selected from consecutive patients of Department of Oral & Cranio-maxillofacial Science of Shanghai Ninth People's Hospital from Dec.2009 to Oct. 2011. The changes of lower incisor proclination and surrounding periodontal condition were evaluated with cone-beam CT (CBCT) and lateral cephalometry. Data was processed using SAS8.02 software package. RESULTS: No significant differences were found in the root length and lingual alveolar bone thickness of lower incisors before treatment, after pre-surgical orthodontic treatment, and after treatment (P>0.05). Labial alveolar bone thickness and lower incisor proclination were increased during pre-surgical orthodontic treatment (P<0.01), and both maintained during post-surgical orthodontic treatment (P>0.05). Both vertical labial and lingual alveolar bone loss occurred during pre-surgical orthodontic treatment(P<0.05), but did not deteriorate during post-surgical orthodontics treatment (P>0.05). CONCLUSIONS: With the application of periodontal micro-osteotomy assisted orthodontic technique, adequate lower incisors decompensation could be achieved with minimal surrounding periodontal side effects for skeletal Class Ⅲ malocclusions with alveolar hypoplasia in the lower anterior region.Supported by National Natural Science Foundation of China (10972142), Research Fund of Science and Technology Committee of Shanghai Municipality (08411961600) and Program for Innovative Research Team of Shanghai Municipal Education Commission.

Key words: Periodontal micro-osteotomy assisted orthodontic treatment, Skeletal Class Ⅲ malocclusion, Alveolar hypoplasia, Cone-beam CT, Lateral cephalometry

CLC Number:

R783.5

WANG Bo, SHEN Guo-fang, FANG Bing, SUN Liang-gong, WU Yong, YU Hong-bo, LIU Jia-qiang. Periodontal micro-osteotomy assisted orthodontic treatment of skeletal Class Ⅲ adults with alveolar hypoplasia in the lower anterior region[J]. China Journal of Oral and Maxillofacial Surgery, 2014, 12(3): 223-227.

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