Effect of bimaxillary surgery on the stress distributions in patients with mandibular retrognathia under unilateral molar clenching

Abstract

To investigate the effect of bimaxillary surgery on the stress distribution of the temporomandibular joint (TMJ) in patients with mandibular retrognathia under unilateral molar clenching (UMC). Five patients with mandibular retrognathia (preoperative group) and ten asymptomatic subjects (control group) were recruited. In addition, patients treated with bimaxillary surgery were considered as the postoperative group. The muscle forces corresponding to UMC were applied. The results showed that the discal stresses in the postoperative group were significantly greater than those in the preoperative and control groups. Bimaxillary surgery plus UMC had a detrimental effect on the TMJ.

Keywords:

• Mandibular retrognathia
• temporomandibular joint (TMJ)
• bimaxillary surgery
• unilateral molar clenching

Acknowledgments

The study was supported by the Affiliated Hospital of Stomatology of Chongqing Medical University Institutional Review Board. Thanks to the Basic Mechanics Laboratory of Sichuan University for their support in this study.

Disclosure statement

The authors declare no conflict of interest related to this study.

Additional information

Funding

The study was supported by the National Natural Science Foundation of China under Grant numbers 12202298 and 31670963, and the Strategic cooperation project between Sichuan University and Yibin Municipal People’s Government under Grant numbers 2019CDYB-16 and 2020CDYB-8.