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Assessment of condylar positional changes in severe skeletal class II malocclusion after surgical-orthodontic treatment

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Abstract

Objectives

This study aimed to determine the positional changes in the condyle in the temporomandibular joint (TMJ) of severe skeletal class II malocclusion patients treated with surgical-orthodontics.

Materials and methods

The measurements of TMJ space in 97 severe skeletal class II malocclusion patients (20 males, 77 females, mean age, 24.8 years, mean ANB = 7.41°) were assessed using limited cone-beam computed tomography (LCBCT) images acquired before orthodontics (T0) and 12 months after surgery (T1). 3D remodeling of the TMJ and measurements of the anterior space (AS), superior space (SS), and posterior space (PS) were performed to determine the position of the condyle for each joint. All data were analyzed by t test, correlation analysis, and Pearson correlation coefficient.

Results

The mean AS, SS, and PS values after the therapy changed from 1.684 to 1.680 mm (0.24%), 3.086 to 2.748 mm (10.968%), and 2.873 to 2.155 mm (24.985%), respectively. The decreases in SS and PS were statistically significant. Positive correlations were found in the mean AS, SS, and PS values between the right and left sides.

Conclusions

The combination of orthodontic and surgical treatment makes the condyle move counterclockwise in the TMJ in severe skeletal class II patients.

Clinical relevance

Studies of temporomandibular joint (TMJ) intervals changes in patients with severe skeletal class II after sagittal split ramus osteotomy (SSRO) are limited. The postoperative joint remodeling, resorption, and related complications remain unstudied.

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Acknowledgements

The authors would like to thank Qing Yin for her help with revising.

Funding

This work was supported by the National Natural Science Foundation of China (No. 81901026) and the Department of Science and Technology of Sichuan Province (No. 2021YFH0139).

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Authors and Affiliations

  1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu, China, 14 Third Section, Renmin South Road, Chengdu, 610041, Republic of China

    Wen Yang, Jiaxuan Li & Nan Jiang

  2. Sichuan University, 14 Third Section, Renmin South Road, Chengdu, 610041, Republic of China

    Yanbin Chen

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  1. Wen Yang
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Wen Yang, Yanbin Chen, Jiaxuan Li, and Nan Jiang. The first draft of the manuscript was written by Wen Yang, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Nan Jiang.

Ethics declarations

This retrospective chart review study involving human participants was in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The Human Investigation Committee (IRB) of Sichuan University approved this study (IRB Reference number: WCHS-IRB-CT-2019-221).

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The authors declare no competing interests.

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Yang, W., Chen, Y., Li, J. et al. Assessment of condylar positional changes in severe skeletal class II malocclusion after surgical-orthodontic treatment. Clin Oral Invest 27, 3683–3693 (2023). https://doi.org/10.1007/s00784-023-04984-6

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  • DOI: https://doi.org/10.1007/s00784-023-04984-6

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