Yu-Pei Wang,1,* Hui-Xia Wei,2,* Yuan-Yuan Hu,3 Yu-Ming Niu3,4 

1Department of Stomatology, Taihe Hospital, Hubei University of Medicine, Shiyan, 442000, People’s Republic of China; 2Department of Anesthesiology, Taihe Hospital, Hubei University of Medicine, Shiyan, 442000, People’s Republic of China; 3Department of Stomatology, Gongli Hospital of Shanghai Pudong New Area, Shanghai, People’s Republic of China; 4Hubei Key Laboratory of Embryonic Stem Cell Research, Hubei Provincial Clinical Research Center for Umbilical Cord Blood Hematopoietic Stem Cells, Taihe Hospital, Hubei University of Medicine, Shiyan, Hubei, 442000, People’s Republic of China

*These authors contributed equally to this work

Correspondence: Yu-Ming Niu, Department of Stomatology, Gongli Hospital of Shanghai Pudong New Area, Shanghai, People’s Republic of China, Tel: +86 13581370999, Email niuyuming@yeah.net

Objective: This study was conducted to investigate the bidirectional causal relationship between obstructive sleep apnea (OSA) and temporomandibular disorders (TMD).
Methods: Using an online pooled dataset of genome-wide association studies (GWAS), a two-sample bi-directional Mendelian randomization (MR) method was implemented. Inverse variance weighting was used as the primary analyses approach, and other methods of MR Egger, weighted median method, MR-Egger, Simple mode, and Weighted mode analysis were conducted as supplements to evaluate the causal relationship between OSA and TMD with odds ratios (OR) and 95% confidence interval (CI). Furthermore, the Cochran Q, MR-Egger, and MR-PRESSO approaches were used to perform the heterogeneity test and multiple validity.
Results: The general results of the forward MR analysis indicated that OSA had a significant causal influence on TMD (OR=1.241, 95% CI: 1.009– 1.526, P=0.041), but no significant correlation was observed in the reverse MR analysis (IVW: OR=0.975, 95% CI=0.918– 1.036, P=0.411).
Conclusion: In summary, our research demonstrated a hereditary causative relationship between OSA and TMD, indicating that appropriate intervention is required for both prevention and treatment of TMD.

Keywords: Mendelian randomization analysis, obstructive sleep apnea, temporomandibular disorders