Meta-analysis of condylar changes produced by a Twin-block appliance in Class Ⅱ malocclusion.
10.7518/hxkq.2023.2023052
- Author:
Yulin LI
1
;
Jingchen XU
1
;
Xiaoge JIANG
1
;
Song CHEN
1
Author Information
1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
- Publication Type:Journal Article
- Keywords:
Class Ⅱ malocclusion;
Meta-analysis;
Twin-block appliance;
condyle;
systematic review
- MeSH:
Humans;
Malocclusion, Angle Class II/therapy*;
Temporomandibular Joint;
Bone and Bones;
China;
Orthodontic Appliances, Functional;
Cephalometry
- From:
West China Journal of Stomatology
2023;41(4):463-470
- CountryChina
- Language:English
-
Abstract:
OBJECTIVES:To evaluate the effects of a Twin-block appliance on the condyles of patients with ClassⅡmalocclusion by conducting a systematic review and a Meta-analysis.
METHODS:Pubmed, Embase, Cochrane Library, Chinese BioMedical Literature Database, China National Knowledge Infrastructure, and VIP Database were electronically searched. Randomized controlled trials, controlled clinical trials, and single-arm trials on condylar changes produced by a Twin-block appliance in patients with ClassⅡmalocclusion were included. Two reviewers independently extracted and assessed the risk of bias. Meta-analyses were conducted with Review Manager 5.3.
RESULTS:Eight studies were included; among which, seven were of high quality. After treatment with a twin block appliance, condyles moved anteriorly. The anterior joint spaces decreased (P<0.000 01), whereas the posterior spaces increased (P<0.000 01). The superior spaces were not changed (P=0.11). Moreover, a significant difference was observed in the increase of the condylar space index (P<0.000 01). After treatment, the anteroposterior diameters of the condyles and condylar height increased (P=0.000 2 and P<0.000 01, respectively). By contrast, no significant changes were discovered in the medial external diameters of the condyles (P=0.42).
CONCLUSIONS:A Twin-block appliance can promote the growth of a condyle in the posterior and upper direction and move it forward in favor of the correction of Class Ⅱ malocclusion.
