Comparison of transverse dimensional changes in surgical skeletal Class III patients with and without presurgical orthodontics.
OBJECTIVE
To investigate transverse dimensional changes of dental arches in surgical skeletal Class III patients with and without presurgical orthodontics.


METHODS
Thirty-six patients with skeletal Class III were included and grouped into those with or without presurgical orthodontics. Eighteen patients (mean age, 22.3 +/- 3.8 years) with presurgical orthodontics (mean presurgical orthodontic treatment time, 176.3 +/- 38.3 days) were in the orthodontics-first (OF) group; the other 18 patients (mean age, 23.3 +/- 4.2 years) without presurgical orthodontics were in the surgery-first (SF) group. The posteroanterior cephalograms initially, before surgery, immediately after surgery, and 1 year after surgery were traced and analyzed. The inclination change of canines and molars was measured to interpret the changes of transverse dimension in both dental arches. Paired and unpaired t tests were performed to test intra- and intergroup differences (P < .05).


RESULTS
Dental changes in transverse planes demonstrated a similar trend in both groups. The maxillary canines were buccally tilted (SF vs OF group, 1.7 degrees vs 1.9 degrees), the maxillary molars were lingually tilted (SF group vs OF group, -4.7 degrees vs -1.0 degrees), the mandibular canines were lingually tilted (SF group vs OF group, 2.9 degrees vs 2.8 degrees), and the mandibular molars were buccally tilted (SF group vs OF group, -6.1 degrees vs -5.4 degrees).


CONCLUSIONS
The magnitude and trend of transverse dental changes in patients with surgical skeletal Class III were similar whether receiving presurgical orthodontics or not.
Wang
Yu-Chih
YC
Department of Craniofacial Orthodontics, Chang Gung Memorial Hospital, Taipei, Taiwan.
Ko
Ellen Wen-Ching
EW
Huang
Chiung-Shing
CS
Chen
Yu-Ray
YR
Takano-Yamamoto
Teruko
T
D002508:Cephalometry; D003481:Cuspid / Q000503:physiopathology; D003724:Dental Arch / Q000473:pathology*; D006801:Humans; D008313:Malocclusion, Angle Class III / Q000473:pathology* / Q000601:surgery / Q000628:therapy*; D008963:Molar / Q000503:physiopathology; D009971:Orthodontics, Corrective; D056948:Orthognathic Surgical Procedures; D011182:Postoperative Care; D011300:Preoperative Care; D012189:Retrospective Studies; D055815:Young Adult