2023, Vol. 27 ›› Issue (11): 1641-1646

Effect of maxillary protraction on temporomandibular joint changes in skeletal class III children: a correlation analysis

Zhang Haolin1, Wang Yalin2, Liu Yafei3, Zuo Yanping2, Zhang Xiaohuan4

1The Second Outpatient Department of Hebei Province, Shijiazhuang 050011, Hebei Province, China; 2Department of Stomatology, Baoding Second Central Hospital, Baoding 071000, Hebei Province, China; 3Department of Orthodontics, The First Hospital of Hebei Medical University, Shijiazhuang 050031, Hebei Province, China; 4Department of Stomatology, Luannan County Hospital of Tangshan, Tangshan 063500, Hebei Province, China

Received:2022-01-10 Accepted:2022-05-06 Online:2023-04-18 Published:2022-09-24
Contact: Liu Yafei, Master, Associate chief physician, Department of Orthodontics, The First Hospital of Hebei Medical University, Shijiazhuang 050031, Hebei Province, China
About author:Zhang Haolin, Associate chief physician, The Second Outpatient Department of Hebei Province, Shijiazhuang 050011, Hebei Province, China Wang Yalin, Master, Physician, Department of Stomatology, Baoding Second Central Hospital, Baoding 071000, Hebei Province, China Zhang Haolin and Wang Yalin contributed equally to this work.
Supported by:
the Project of Hebei Provincial Health Department, No. 20211450 (to LYF)

Abstract: BACKGROUND: Maxillary protraction treatment can effectively change the craniofacial structural relationship and the temporomandibular joint structure of children with skeletal Class III malocclusion. However, there are no definitive findings regarding the correlation between changes in the temporomandibular joint and craniomaxillofacial changes after maxillary protraction.
OBJECTIVE: To analyze the correlation between dentofacial changes and temporomandibular joint changes in children with skeletal class III malocclusion before and after maxillary protraction and to investigate the effect of maxillary protraction on the temporomandibular joint of children.
METHODS: A total of 29 children with skeletal class III malocclusion, including 16 boys and 13 girls, aged 8-11 years, were treated by maxillary protraction. The changes of dentofacial and temporomandibular joint were subjected to cephalometric analysis and coordinate system positioning measurement. Paired t-test, Mann-Whitney test and Pearson correlation analysis were conducted.
RESULTS AND CONCLUSION: The sagittal relationship of the jaw changed obviously before and after maxillary protraction. The glenoid fossa and condyle changed significantly in the X axis but not in the Y axis. The posterior space of the temporomandibular joint was significantly reduced. Correlation analysis revealed a moderate correlation between the temporomandibular joint and dentofacial structural changes. To conclude, after maxillary protraction, both dentofacial and temporomandibular joint structures have significant changes, and there is a moderate correlation between temporomandibular joint remodeling and dentofacial changes, but no close correlation exists between them.
Key words: temporomandibular joint, maxillary protraction, skeletal class III, late mixed dentition, correlation analysis

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