Occlusal splint therapy in patients with Ménière's disease and temporomandibular joint disorder.

Objective: This retrospective study aimed to verify the outcomes of stabilising occlusal splint therapy prescribed to 22 patients with unilateral definite Ménière's disease and comorbid temporomandibular joint disorder.

Methods: The results of a battery of audiometric and vestibular tests were recorded before and after 6 months of treatment, as well as the scores of disease-specific questionnaires.

Results: The average hearing threshold in the affected ear and the acoustic immittance were unchanged. No spontaneous and positional nystagmus were recorded. Caloric hypo-responsiveness and vestibular myogenic evoked responses did not vary. No changes of stabilometric body sway parameters in eyes opened condition and with optokinetic stimulation delivered to the unaffected labyrinth were observed. A significant reduction was recorded in eyes closed condition and with the optokinetic stimulation toward the affected ear. The Tinnitus Handicap Inventory, the Situational Vertigo Questionnaire and the Numeric Pain Rating Scale scores improved. The number of vertigo attacks was reduced.

Conclusions: Occlusal splint therapy is a favourable option to reduce aural symptoms of Ménière's disease and comorbid temporomandibular joint disorder, even if its pathophysiological mechanism remains elusive.