[Self-ligating vs. conventional brackets in the treatment of patients with Class II division 2 malocclusion: a clinical trial of dental and cephalometric analysis].
OBJECTIVE
To compare the dental and skeletal changes in patients with Class II division 2 malocclusion treated with self-ligating and conventional bracket systems.


METHODS
Forty patients with Class II division 2 malocclusion were treated non-extraction. Half of them were treated with self-ligating brackets and the others were treated with conventional brackets. The dental casts and lateral cephalometric radiophotographs were analyzed before and after treatment.


RESULTS
Significant increase in inter premolar widths, arch lengths, U1-NA, L1-MP and arch perimeters were noted after orthodontic treatment in both groups. Statistically greater increase in upper inter-first premolar [(4.45 ± 2.60) mm] was found in self-ligating group than in conventional group [(2.41 ± 2.74) mm, P < 0.05]. Stepwise regression analysis indicated that the increase in arch length and arch width contributed to the increase in arch perimeter.


CONCLUSIONS
There were an overall increase in arch widths and lengths in patients treated with self-ligating and conventional bracktets. However, more arch width increase was found in self-ligating group than in conventional group.
Department of Orthodontics, Capital Medical University Shool of Stomatology, Beijing 100050, China.
Yu-ping
YP
Chen
Song
S
Li
D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000000981:diagnostic imaging / Q000628:therapy*; D016910:Orthodontic Brackets; D009971:Orthodontics, Corrective; D011861:Radiography, Dental; D012044:Regression Analysis; D055815:Young Adult