[Meta-analysis of the condylar position changes produced by functional appliances in class Ⅱ malocclusion].
OBJECTIVE
This study aimed to analyze the condylar position changes produced by functional appliances in class Ⅱ malocclusion by systematic review.


METHODS
Electronic search was conducted using Chinese Biomedical Literature Database, China National Knowledge Infrastructure, VIP Database for Chinese Technical Periodicals, Medline, Embase, Pubmed, and Cochrane Central Register of Controlled Trials. Studies on condylar position changes produced by functional appliances in class Ⅱ malocclusion were included. Risk of bias assessment and data extraction of included studies were conducted by two reviewers independently. The meta-analysis was carried out using Revman 5.1.


RESULTS
Six studies were included (five high quality and one low quality). The condylar position showed no changes after Herbst treatment. The condylar posterior space after Twin-block treatment averagely increased by 0.31 mm (P<0.000 01), whereas the condylar anterior space averagely reduced by 0.32 mm (P<0.000 01).


CONCLUSIONS
Twin-block appliance enables forward movement of the condylar position. This result contributes to the correction of class Ⅱ malocclusion.
State Key Laboratory of Oral Diseases, Dept. of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
Huang
H
Xinqi
State Key Laboratory of Oral Diseases, Dept. of Oral and Maxillo-facial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
Cen
C
Xiao
State Key Laboratory of Oral Diseases, Dept. of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
Liu
L
Jun
D016208:Databases, Factual; D006801:Humans; D008312:Malocclusion, Angle Class II
angle class Ⅱ malocclusion; condyle; functional appliance; meta-analysis; systematic review