Cone-beam CT evaluation of the changes in the temporomandibular joint of patients with classⅡdivision 1 subdivi-sion malocclusion before and after Twin-block treatment
- VernacularTitle:采用锥形束CT分析安氏Ⅱ类1分类错患者Twin-block矫治前后颞下颌关节的变化
- Author:
Bowen LIU
1
;
Yanmin WANG
;
Fang SONG
;
Min LIU
;
Ying DUAN
;
Li ZHOU
Author Information
- Keywords: cone-beam CT; class Ⅱ division 1 malocclusion; Twin-block functional appliance; temporomandibu-lar joint
- From: West China Journal of Stomatology 2013;(6):610-614
- CountryChina
- Language:Chinese
- Abstract: Objective This study aims to evaluate the temporomandibular joint (TMJ) changes in patients with class Ⅱ division 1 subdivision malocclusions before and after Twin-block treatment using a cone-beam CT (CBCT). Methods Twenty subjects with class Ⅱ division 1 subdivision malocclusions were included in this study. Hand-wrist radiographs were conducted in the FG-G stage. CBCT was performed to determine the changes in the TMJ before and after the Twin-block treatment. The InVivoDental software was used to calculate the relevant parameters from the three-dimensional CBCT images. The acquired data were then analyzed. Results After treatment, the sagittal condylar anterior spaces were reduced, whereas the sagittal condylar superior and posterior spaces as well as the coronal condylar superior space increased (P<0.01). The condylar height, sagittal condylar angles, and condylar anteroposterior diameters also increased (P<0.01). Conclusion After the Twin-block treatment, new bone deposition was observed on the condyle. The condyle height also increased and resulted in adjustments in the condyle position within the glenoid fossa to more downward and forward positions. CBCT can quantify TMJ changes and provide an objective assessment to orthodontic treatment.
