title: [The centric relation-maximum intercuspation discrepancy in adult angle's class II pretreatment patients].
abstract: OBJECTIVE
  This study investigates the differences in condylar position between centric relation (CR) and maximum intercuspation (MI) in Angle's Class II orthodontic patients before treatment.
  
  
  METHODS
  80 cases, who were Angle's Class II pretreatment patients, and 50 cases, who were normal(ideal) occlusion were accepted. Dental casts were mounted on Panadent articulator with CR bite record, taken by bilateral manipulation and load testing. The differences in condylar position between CR and MI in all three spatial planes were measured using the Panadent condylar position indication (CPI).
  
  
  RESULTS
  (1) The positive rate of CR-MI discrepancy was 92.50%(74 cases) in the group of Angle's Class II malocclusion and 10.00% (5 cases) in the group of normal occlusion(P< 0.001). 2)74.32% (55 cases) CR-MI discrepancy in 74 cases in the group of Angle's Class II pretreatment patients were coincidence discrepancy. (3)91.25% patients in the group of Angle's Class 11 malocclusion and 66.00% in the group of normal occlusion present occlusion interferences which located at the posterior teeth.
  
  
  CONCLUSIONS
  The results suggested that orthodontists should be aware of a high incidence of condylar displacement in Angle's Class ii pretreatment patients, and measure condylar displacement before the start of comprehensive orthodontic treatment to unmask real jaw relationships and avoid possible misdiagnoses.
authors.affiliation: Dept. of Orthodontics, The Affiliated Hospital of Stomatology, Chongqing Medical University, Chongqing 400015, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Deng
authors.forename: Zhe
authors.initials: Z
authors.lastname: Wan
authors.forename: Shu-shu
authors.initials: SS
authors.lastname: He
authors.forename: Peter
authors.initials: P
authors.lastname: Wamalwa
authors.forename: Song
authors.initials: S
authors.lastname: Chen
authors.forename: Zhi-yi
authors.initials: ZY
authors.lastname: Zhang
mesh_terms: D000328:Adult; D016302:Centric Relation; D003724:Dental Arch; D003725:Dental Articulators; D003766:Dental Occlusion; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion; D008335:Mandibular Condyle