title: [Exploration for micro-osteotomy assisted orthodontic treatment of skeletal Class III malocclusions with alveolar hypoplasia in the lower anterior region].
abstract: OBJECTIVE
  To investigate the changes of periodontal conditions after micro-osteotomy assisted lower incisor decompensation for skeletal Class III malocclusions with alveolar hypoplasia in the lower anterior region.
  
  
  METHODS
  The sample consisted of 22 cases diagnosed as skeletal Class III malocclusions with alveolar hypoplasia in the lower anterior region, selected from consecutive patients of Department of Oral & Cranio-maxillofacial Science of Shanghai Ninth People's Hospital during 2009-2012. The samples were divided into 2 groups; G1 comprised 10 patients who accepted micro-osteotomy assisted lower incisor decompensation; G2 comprised 12 patients who chose traditional pre-surgical decomposition. The changes of periodontal conditions of both groups were evaluated with the help of cone-beam CT(CBCT). Data was processed using SAS8.02 software package.
  
  
  RESULTS
  For subjects in G1, during the micro-osteotomy assisted pre-surgical orthodontics, no significant difference was found in the amount of root resorption of lower incisors.But labial and lingual vertical alveolar bone loss were 2.60 mm and 2.22 mm; alveolar bone thickness increased by 3.05 mm on the labial side and decreased by 0.88 mm on the lingual side (P<0.05). Better periodontal conditions were reserved compared with those of G2.
  
  
  CONCLUSIONS
  Micro-osteotomy assisted pre-surgical orthodontics was much safer than traditional orthodontics for skeletal Class III malocclusions with alveolar hypoplasia in the lower anterior region.
authors.affiliation: Department of Oral & Cranio-Maxillofacial Science, Shanghai Jiao Tong University School of Medicine, Shanghai, China. wb228@126.com
authors.forename: Bo
authors.initials: B
authors.lastname: Wang
authors.forename: Guo-fang
authors.initials: GF
authors.lastname: Shen
authors.forename: Bing
authors.initials: B
authors.lastname: Fang
authors.forename: Liang-yan
authors.initials: LY
authors.lastname: Sun
authors.forename: Yong
authors.initials: Y
authors.lastname: Wu
authors.forename: Ling-yong
authors.initials: LY
authors.lastname: Jiang
authors.forename: Min
authors.initials: M
authors.lastname: Zhu
mesh_terms: D016301:Alveolar Bone Loss; D002508:Cephalometry; D054893:Cone-Beam Computed Tomography; D006801:Humans; D007180:Incisor; D008313:Malocclusion, Angle Class III; D010027:Osteotomy; D012391:Root Resorption