[Effects of non-surgical treatment on temporomandibular joint of adult low-angle subjects with severe skeletal class III deformity].
OBJECTIVE
To investigate effects of non-surgical treatment on temporal mandibular joint(TMJ) of adult low-angle subjects with severe skeletal Class III deformity.


METHODS
Thirteen low-angle patients with severe skeletal Class III malocclusion (male 5, female 8) were included in the study. The average age was 21.3 years old. They were treated with OPA-K straight wire technique. Helkimo index evaluation was made before and after treatment. Lateral cephalometric films and corrected TMJ lateral cephalometric radiograghs were taken before and after treatment, and linear and area measurement were observed. All data were analyzed with SPSS 12.0 software.


RESULTS
After non-surgical treatment, Helkimo indexes of all patients redistributed. The line distance and area of anterior space in TMJ increased while the posterior space decreased. Linear percent decreased from 20.81% to 8.04%, and area proportion decreased from 1.62 to 1.01. Anterior space was the same as the posterior. Condyles and mandibles were retruded.


CONCLUSIONS
After non-surgical therapy in adult low-angle subjects with severe skeletal Class III malocclusion, condyles remove posteriorly from more anterior position to normal concentric position, and temporo-mandibular disorders symptom is relieved and cured effectively.
Zhao
Yan-hong
YH
Department of Orthodontics, School of Stomatology, Shandong University, Jinan, China.
Wang
Chun-ling
CL
Guo
Jie
J
Zhu
Kun
K
Wei
Fu-lan
FL
D000328:Adult; D002508:Cephalometry; D005260:Female; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III; D008334:Mandible; D013704:Temporomandibular Joint; D013705:Temporomandibular Joint Disorders