title: [Dentoalveolar compensation in skeletal Class III patients treated with orthognathic surgery].
abstract: OBJECTIVE
  To investigate the compensation of the upper and lower incisors in skeletal Class III patients treated with orthodontic-surgical approach.
  
  
  METHODS
  The samples consisted of 54 skeletal Class III patients treated with orthodontic-surgical approach from November 2011 to January 2015. Lateral cephalograms were taken before treatment. The differences between the samples and the norms from Peking University normal occlusion sample library were assessed using independent-sample t test. Correlation analyses were performed to find associations between skeletal and dental parameters. According to skeletal anteroposterior discrepancy/vertical type (ANB/SN-MP), the samples were allocated into group A (ANB < -4°, SN-MP ≤ 37.7°, n = 11), group B (ANB ≥ -4°, SN-MP ≤ 37.7°, n = 16), group C (ANB < -4°, SN-MP > 37.7°, n = 14), and group D (ANB ≥ -4°, SN-MP > 37.7°, n = 13). After measurement of variables, one-way ANOVA with SNK multiple comparison test were performed.
  
  
  RESULTS
  The maxillary incisors were more proclined and the mandibular incisors more retroclined in skeletal Class III patients compared with norm values (P < 0.01). Both skeletal anteroposterior discrepancy and vertical type were correlated with the position of upper and lower incisors (P < 0.01). According to skeletal anteroposterior discrepancy/vertical type, no significant differences were found in the upper incisors' inclination among the four groups, while patients in group A and group D exhibited significant difference in lower incisor compensation.
  
  
  CONCLUSIONS
  Different skeletal anteroposterior discrepancy/vertical type resulted in varied incisors' compensation. Therefore, decompensation should be treated differently.
authors.affiliation: Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China; Email: xiaotonglee@hotmail.com.
authors.forename: Xiaotong
authors.initials: X
authors.lastname: Li
mesh_terms: D000704:Analysis of Variance; D000068476:Beijing; D002508:Cephalometry; D006801:Humans; D007180:Incisor / Q000473:pathology*; D008313:Malocclusion, Angle Class III / Q000145:classification / Q000473:pathology / Q000601:surgery*; D008334:Mandible; D008437:Maxilla; D057909:Orthognathic Surgery