@article{article_1611816, title={Biomechanical Stress Analysis in Retrodiscal Tissues of Temporomandibular Joint with Unilateral Disc Displacement Without Reduction: A Finite Element Study}, journal={EurAsian Journal of Oral and Maxillofacial Surgery}, volume={4}, pages={1–6}, year={2025}, author={Shirinov, Malik and Singer, Emine Asena and Baş Akkor, Burcu}, keywords={Disc displacement without reduction, Disc displacement without reduction, finite element analysis, finite element analysis, retrodiscal tissue, retrodiscal tissue, stress distribution, stress distribution, temporomandibular joint, temporomandibular joint}, abstract={Objective: This study aimed to evaluate stress changes in retrodiscal tissues during mandibular movements in temporomandibular joints (TMJ) with unilateral disc displacement without reduction (DDwoR) using finite element analysis (FEA). Materials and Methods: Geometric models were created using CT scan data from two patients: one with bilaterally normal disc positioning and another with DDwoR. DICOM files were segmented, and 3D models were reconstructed and converted into mathematical models following a standardized methodology. Two models were analyzed: a control model with bilaterally normal discs and a DDwoR model, with separate evaluations of the left (normal) and right (DDwoR) joints. TMJ movements during mouth opening and closing were simulated, and stress distribution patterns in the retrodiscal tissues were analyzed. Von Mises stress values were measured and compared between the DDwoR and healthy sides. Results: Both the normal and DDwoR sides demonstrated altered stress patterns compared to the healthy control. The DDwoR side consistently exhibited elevated stress in the superior region during mouth opening, underscoring its mechanical vulnerability. The normal side, while less affected than the DDwoR side, displayed compensatory stress increases, particularly in the intermediate region during mouth opening. Conclusion: These findings underscore the vulnerability of the retrodiscal tissues, especially the superior region, to mechanical stress in the presence of DDwoR. This study highlights the importance of clinical strategies aimed at preserving retrodiscal tissue integrity to prevent progressive joint damage.}, number={1}, publisher={Ağız ve Çene Yüz Cerrahisi Birliği Derneği}