title: [Study on the posterior teeth mesiodistal tipping degree of normal occlusion subjects among different facial growth patterns].
abstract: OBJECTIVE
  To study the relationship between the mesiodistal tipping degree of maxillary and mandible posterior teeth and different vertical facial skeletal types of subjects with normal occlusion.
  
  
  METHODS
  163 subjects with normal occlusion were selected, lateral cephalograms were taken and divided into three different facial skeletal types. The difference of the mesiodistal tipping degrees and intersection angles of upper and lower posterior teeth between the three different facial skeletal types were analyzed.
  
  
  RESULTS
  Among 163 subjects, vertical growth pattern, average growth pattern and horizontal growth pattern were 24, 96 and 43 respectively. There were statistic differences of mesiodistal tipping degrees of the first and second maxillary and mandible premolar and the first permanent molar between vertical growth and horizontal growth pattern, horizontal growth and average growth pattern (P < 0.05). But there were no statistically significant differences between vertical growth and average growth pattern (P > 0.05). The differences of the maxillary and mandible posterior teeth's intersection angle among three vertical facial skeletal types had no statistic significance (P > 0.05).
  
  
  CONCLUSIONS
  Different vertical facial skeletal type has its own normal and coordinated posterior teeth mesiodistal tipping degrees.
authors.affiliation: Dept. of Orthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Chun-hui
authors.initials: CH
authors.lastname: Liao
authors.forename: Pu
authors.initials: P
authors.lastname: Yang
authors.forename: Zhi-he
authors.initials: ZH
authors.lastname: Zhao
authors.forename: Mei-ying
authors.initials: MY
authors.lastname: Zhao
mesh_terms: D003766:Dental Occlusion; D006801:Humans; D008334:Mandible / Q000033:anatomy & histology*; D008437:Maxilla / Q000033:anatomy & histology*; D014070:Tooth