Impact of Temporomandibular Joint Dysfunction on Objective and Subjective Vocal Measures

A Clinical Study on the Effects of Temporomandibular Joint Dysfunction-Induced Limitations in Mouth Opening on Objective and Subjective Vocal Measurements

The present study aims to investigate the impact of temporomandibular joint dysfunction (TMD) on objective and subjective vocal parameters and the quality of life in affected patients. TMD is a pervasive public health issue that impacts approximately 25% of the general population and is notably more prevalent among women. The etiology of TMD is multi-factorial, with known risk factors such as parafunctional habits, emotional stress, occlusion issues, and orthodontic treatments. Internal derangements of the temporomandibular joint are the most common subtype of TMD, characterized by symptoms such as pain, joint noises, restricted mouth opening, and masticatory dysfunction.

This study particularly focuses on the limitations in mouth opening due to TMD and its effects on vocal characteristics and quality of life. Conservative treatment methods, such as non-steroidal anti-inflammatory drugs (NSAIDs) and occlusal splints, have been effective in symptom management unless there is clear evidence of joint collapse or ankylosis. The null hypothesis (H0) posits that the restriction in mouth opening has no impact on vocal parameters or quality of life.

Inclusion Criteria:

• Individuals aged between 18 and 65 years.
• Capable of giving informed consent.
• Fluent in the local language for effective communication.
• No history of hearing impairment or high communicative demands in their profession.
• Absence of a history of vocal disorders or conditions affecting voice quality.

Exclusion Criteria:

• Individuals with a vocal disorder.
• Unable to provide informed consent or meet study requirements.
• Pregnant or lactating women.
• Presence of any medical condition that could potentially affect voice quality.