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Background: Sleep disorders are associated with temporomandibular disorders (TMDs). Limited studies have focused on excessive daytime sleepiness (EDS) and its impact on jaw functions in TMD patients. Objective: The aim of the present investigation was to identify the impact of EDS on pain and jaw function in TMD patients. Methods: A total of 338 TMD patients (50 males and 288 females) was included. The Epworth Sleepiness Scale (ESS) was used to classify patients into EDS group (score ≥ 10) and non‐EDS group (score < 10). The Jaw Functional Limitation Scale 8‐item (JFLS‐8) was used to assess the severity of jaw dysfunction. Pain intensity was evaluated using the Visual Analogue Scale (VAS). Anxiety and depression were evaluated using the Generalised Anxiety Disorder 7‐item (GAD‐7) and the Patient Health Questionnaire 9‐item (PHQ‐9). All included patients were diagnosed with pain‐related TMD (PT), intra‐articular TMD (IT) or combined TMD (CT). Results: Compared with non‐EDS patients, EDS patients exhibited more severe jaw dysfunction, greater pain intensity and higher PHQ‐9 scores (p <.05). Multivariate analyses showed that EDS (B = 3.69), female gender (B = 3.69), and elevated GAD‐7 score (B = 0.73) were significantly associated with an increased score on the JFLS‐8 (p <.05). Moreover, bivariate logistic regression analysis indicated a significant relationship between EDS and PT (OR = 2.70, p =.007). Conclusion: The presence of EDS was more closely related to PT, but the causal relationship between them needs to be further confirmed. More concern and intervention to alleviate poor sleep quality might be highlighted during the treatment of TMD, especially PT subtype. [ABSTRACT FROM AUTHOR]

Background: Degenerative joint disease (DJD) can be associated with disc displacement (DD) in temporomandibular disorder (TMD) patients. However, the relationship between different types of DDs and DJD remains unclear. Objectives: To investigate the odds ratios of different types of sagittal and coronal DDs confirmed by magnetic resonance imaging (MRI) and DJD confirmed by cone‐beam computed tomography (CBCT) in TMD patients. Methods: Radiographic data from 69 males and 232 females were collected for analysis. CBCT was used to diagnose DJD, with criteria including erosion, osteophytes, generalised sclerosis and cysts in the joint. Eight types of DDs were evaluated by sagittal and coronal MRIs: NA, no abnormality; SW, sideways; ADDR, anterior with reduction; ADDR+SW; ADDNR, anterior without reduction; ADDNR + SW; single SW; PDD, posterior; PDD + SW. The odds ratios of DJD in joints with different types of DDs were determined after joint correlation, age and gender adjustment. Results: Compared with NA, the odds ratio of DJD in ADDR was 2.397 (95% CI [confidence interval]: 1.070–5.368), ADDR + SW was 4.808 (95% CI: 1.709–3.528), ADDNR was 29.982 (95% CI: 15.512–57.950) and ADDNR + SW was 25.974 (95% CI: 12.743–52.945). Erosion was significantly increased in ADDR, ADDR + SW, ADDNR and ADDNR + SW; osteophytes were significantly increased in ADDR + SW, ADDNR and ADDNR + SW; and generalised sclerosis and cysts were significantly increased in ADDNR and ADDNR + SW. There were no significant associations between single SW, PDD, PDD + SW and the DJD. Conclusions: ADDR, ADDR+SW, ADDNR and ADDNR+SW were associated with DJD. ADDNR had a significantly higher prevalence of DJD than ADDR. There were no significant relationships between single SW, PDD, PDD + SW and the DJD. [ABSTRACT FROM AUTHOR]

Objective: The objective of the study was to investigate the relationship between types of disc displacement (DD) diagnosed by magnetic resonance imaging (MRI), and the risk (presence or absence) and severity of condylar erosion (CE) graded using cone‐beam computed tomography (CBCT) in adult Temporomandibular disorders (TMD) patients. Methods: A total of 353 TMD patients (283 females, 70 males) underwent MRI scans to categorise DD as normal (NA), anterior displacement with reduction (ADDR), or anterior displacement without reduction (ADDNR). CE severity was graded on a scale of 0–3 (absence, mild, moderate or severe) using CBCT. To establish the plausibility and cut‐off points for CE diagnosis, the severity of CE was then further divided into three classifications: Grade 0 versus 1 + 2 + 3; Grades 0 + 1 versus 2 + 3; Grades 0 + 1 + 2 versus 3. Logistic regression analysis was performed, adjusting for age, gender and joint correlation. Results: ADDNR significantly increased the risk of CE compared with NA (OR = 10.04, 95% CI: [6.41, 15.73]) and showed a significant increase in CE severity across all classifications (ORs = 10.04–18.95). The effects of ADDNR were significant in both genders (p <.001) and had a greater impact in females. ADDR was predominantly associated with mild CE. Conclusions: ADDNR significantly increased the risk and severity of CE independent of gender when compared to NA, whereas ADDR was mainly associated with mild CE. Slight cortical discontinuity may represent a subclinical diagnosis requiring further investigation. [ABSTRACT FROM AUTHOR]

Background and Objectives: With the increasing attention to bruxism, the research on bruxism is increasing rapidly. However, there is still a lack of systematic bibliometric analysis in the field of bruxism in adults. This study aimed to comprehensively explore and visualize the global trends and research hotspots in the field of bruxism in adults during 1991–2021. Methods: The study searched the literature published during 1991–2021 in the Web of Science Core Collection database without language restrictions. VOSviewer, CiteSpace and Microsoft Excel were applied to analyse the authors, institutions, journals, countries, cited references, keywords and other information of the included publications, and construct visualized cooperation networks. Results: A total of 878 articles were finally included. The top two most productive authors in the past 30 years were Lobbezoo F and Manfredini D. ACTA‐Amsterdam, Univ Sao Paulo, Univ Helsinki, Univ Padua, Univ Montreal, et al. were prominent institutions in this field. Journal of Oral Rehabilitation made outstanding contributions in this field. The United States produced the most documents in this field, followed by Brazil. Both countries and authors cooperated closely around the world. The two most cited articles focused on the definition, assessment and classification of bruxism. In recent years, diagnostic criteria and stress have begun to receive a lot of attention. Conclusion: From 1991 to 2021, the attention to bruxism in adults continued to increase. Diagnostic criteria and stress may be potential research hotspots in this field. This study references relevant scholars on development trends and research hotspots. [ABSTRACT FROM AUTHOR]

Objective: The association between jaw function and income in patients with temporomandibular disorders (TMDs) remain unclear. The aim of this study was to explore this association and its relationship with anxiety and depression. Subjects and Methods: A total of 451 TMD patients, including 361 males and 90 females, participated in this study. The sociodemographic information of patients and their questionnaires including the Generalised Anxiety Disorder 7‐item (GAD‐7), Patient Health Questionnaire 9‐item (PHQ‐9), and Jaw Functional Limitation Scale‐8 (JFLS‐8) were collected. Patients were divided into the high‐income and low‐income groups based on a household per capita income of 6000 RMB per month. Multiple regression and mediation analysis were used to explore the association between variables. The bootstrap method was applied to estimate confidence intervals (CIs). Results: Higher JFLS‐8 scores were significantly correlated with higher GAD‐7 scores (r = 0.361, p <.001), PHQ‐9 scores (r = 0.339, p <.001). Females and patients with low income had statistically higher JFLS‐8 scores (p <.01, p <.001). Mediation analysis with 10 000 bootstrap simulations revealed a significant direct association between JFLS‐8 scores and income (−2.920, 95% CI [−4.757, −1.044], p =.002). A significant indirect association of JFLS‐8 scores with income via GAD‐7 scores and PHQ‐9 scores was also observed (−0.889, 95% CI [−1.728, −0.164], p =.025), accounting for 23.3% of the total association. Conclusions: Low income is associated with impaired jaw function via anxiety and depression in patients with TMD. Clinicians may need to pay more attention to the psychological status of low‐income TMD patients in clinical practice. [ABSTRACT FROM AUTHOR]

Background: Some orthodontic patients are associated with temporomandibular joint disorders (TMDs), and the differences between jaw function and psychological states in orthodontic patients with different types of TMDs remain unknown. Objective: This cross‐sectional study aimed to investigate the prevalence of different types of TMDs in orthodontic patients and to evaluate the relationship between different types of TMDs and jaw functional limitation and psychological distress in orthodontic patients. Methods: A questionnaire was sent to patients willing to participate in this survey, which included questions about the demographic characteristics of the participants, the five TMD symptoms (5Ts) of the Diagnostic Criteria for TMDs, the Jaw Functional Limitation Scale‐8 (JFLS‐8) and the Patient Health Questionnaire for Depression and Anxiety (PHQ‐4). The subjects were divided into three groups: painful TMDs (PT), non‐painful TMDs (NPT), and TMD‐free according to whether they had TMDs and its subtypes. Results: A total of 670 valid questionnaires were collected from 182 males and 488 females. The prevalence of TMDs was 35.4%, of which the prevalence of PT was 11.8% and the prevalence of NPT was 23.6%. The median JLFS‐8 score of TMD patients was significantly higher than TMD‐free, and PT patients were significantly higher than NPT (p =.026). After adjusting for confounding factors, the jaw function and psychological states of PT patients and NPT patients were worse than those of the TMD‐free group. Conclusions: Among the orthodontic patients surveyed, more than one‐third had TMDs and the prevalence of PT was lower than NPT. Having TMDs is associated with more severe jaw functional limitation, and PT patients were more serious than NPT patients. At the same time, the psychological states of TMDs patients were also worse. [ABSTRACT FROM AUTHOR]