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Background Objective Materials and Methods Results Conclusions Temporomandibular joint disorders (TMDs) are common in young adults, and the link between chronotype profile and TMDs is unclear.This study examined TMD prevalence and chronotype distribution and explored the relationship between chronotype and TMDs in young adults.A total of 663 students from Sichuan University completed questionnaires. Chronotype profiles were assessed using the Morningness‐Eveningness Questionnaire, and TMDs were screened using the Fonseca Memory Index. To validate the findings, 68 TMD patients and 136 controls were enrolled.The prevalence of TMDs was 69.7%, with significant differences among chronotype profiles. The intermediate profile was the most common chronotype. Eveningness profile was associated with higher TMDs prevalence and severity. Muscle pain and side movement difficulty scores were higher in eveningness and intermediate profiles. Female gender (OR 2.345; 95% CI 1.668–3.297) was a TMD risk factor, while morningness profile (OR 0.537; 95% CI 0.297–0.970) was protective. Validation with TMD patients and controls supported these findings, showing higher eveningness profile prevalence in the TMD groups.TMDs have a high prevalence in college students, chronotype profiles shown to be associated with TMDs. Morningness is the protection factor in TMDs and PT, eveningness is a risk factor for IT. [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]