This study aimed to investigate the relationship between Type D personality traits, somatization disorder, and perceived social support in individuals diagnosed with temporomandibular joint disorders. Temporomandibular joint disorders are musculoskeletal and neuromuscular conditions that affect the jaw joint, chewing muscles, and related structures, leading to pain and functional difficulties. Psychological and social factors, such as personality traits and emotional distress, have been shown to influence the development and persistence of these disorders.

The research was conducted as a prospective cross-sectional study between February and June 2025 in Gaziantep City Hospital. Adult participants between 18 and 65 years of age who were diagnosed with temporomandibular joint disorders were compared with healthy individuals of similar age and gender. Participants completed validated questionnaires that assessed mandibular function, anxiety and depression symptoms, Type D personality traits, somatization tendencies, and levels of perceived social support. The purpose of this study was to provide a more comprehensive understanding of the psychological and social dimensions that may contribute to the onset and course of temporomandibular joint disorders.

This research was designed as a prospective cross-sectional study conducted between February 2025 and June 2025 in the Otorhinolaryngology outpatient clinic of Gaziantep City Hospital, Turkey. The study included two groups: patients diagnosed with temporomandibular joint disorders and healthy control participants matched for age and gender. All participants were between 18 and 65 years of age, literate, cognitively intact, and voluntarily agreed to participate. Ethical approval was granted by the institutional ethics committee, and written informed consent was obtained from all individuals before enrollment.

Data collection involved face-to-face interviews using standardized self-report questionnaires. The following instruments were used:

1. **Mandibular Function Impairment Questionnaire:** This instrument includes 17 questions that evaluate functional problems of the jaw during daily activities. Each question is scored on a five-point scale, and higher total scores indicate greater impairment in jaw function.
2. **Hospital Anxiety and Depression Scale:** This tool consists of 14 questions that measure symptoms of anxiety and depression. It has two parts, each containing seven questions. Each section produces a total score between zero and twenty-one, where higher values represent greater symptom severity.
3. **Type D Personality Scale:** This scale contains fourteen statements divided into two categories: negative emotions and social inhibition. Each statement is rated on a five-point scale from zero to four. A score of ten or more on both categories indicates the presence of Type D personality traits.
4. **Somatization Scale:** This questionnaire includes thirty-three true or false statements that identify the presence of unexplained physical symptoms. Some statements are reverse coded. Higher total scores show more frequent or severe somatic complaints.
5. **Multidimensional Scale of Perceived Social Support:** This twelve-question scale measures perceived emotional and practical support from three sources: family, friends, and a significant other. Each item is rated on a seven-point scale. Higher scores represent stronger perceived social support.

In addition to these scales, sociodemographic data such as age, sex, marital status, education, occupation, and income were recorded. Exclusion criteria included the presence of severe psychiatric disorders, neurological disease, or cognitive impairment that could interfere with understanding or completing the questionnaires.

All collected data were analyzed using appropriate statistical methods. Distribution normality was assessed, and comparisons between the two groups were performed using suitable parametric or non-parametric tests. Associations among the measured psychological and functional parameters were examined through correlation analyses.

The objective of this study was to identify potential associations between Type D personality, somatization, and perceived social support in individuals with temporomandibular joint disorders. By evaluating these interrelated psychological and social variables, the study sought to emphasize the importance of a holistic and multidisciplinary approach in understanding and managing temporomandibular joint disorders.

Inclusion Criteria:

Adults aged 18-65 years

Ability to read and write

Cognitively intact

Patients diagnosed with temporomandibular joint disorders or healthy volunteers

Exclusion Criteria:

Younger than 18 years or older than 65 years

Illiteracy

Cognitive impairment

Not meeting the specified inclusion criteria

The study population consists of adult patients aged 18 to 65 years who were diagnosed with temporomandibular joint disorders and presented to the Otorhinolaryngology outpatient clinic at Gaziantep City Hospital. In addition, age- and sex-matched healthy volunteers without temporomandibular joint disorders were included as the control group.

The datasets generated and analyzed during the current study will be available from the corresponding author upon reasonable request.

The individual participant data and supporting documents will be available beginning six months after publication of the main results and will remain available for a minimum of five years.

Individual participant data and supporting documents will be accessible to qualified researchers upon submission of a reasonable request to the corresponding author. Requests should include a methodologically sound research proposal and a commitment to use the data only for research purposes. Data will be shared in de-identified form to protect participant confidentiality.