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The Relationship between Occlusal Interferences and Temporomandibular Disorders

The significance of occlusal interferences in the aetiology of temporomandibular disorders (TMD) has been questioned in numerous past and recent articles of dental literature. The aim of this study was to analyze the relationship between clinical diagnoses of TMD and different types of occlusal intereferences (centric interferences (retruded contact position (RCP) intercuspal position (ICP) slide greater than 1 mm), working interferences, and nonworking interferences during lateral and protrusive mandibular movements) in a young adult nonpatient population. A questionnaire including data from history and clinical functional examination was used in the study. All subjects (a total of 230) were male (conscripts), from 19 to 28 years of age (mean 21.3 ± 2.1). The prevalence of occlusal interferences in percentage in 230 young adult non-patients, 65% had no occlusal interferences during examination of the functional state of occlusion, while 14% of subjects had centric interferences (RCP-ICP slide greater than 1 mm), 5% of subjects had working interferences and 16% of subjects had nonworking interferences during lateral and protrusive mandibular movements. Statistical analysis (Chi square test) did not show any significant differences in the distrubution of occlusal interferences between the group of subjects with the clinical diagnoses of TMD and the group of asymptomatic subjects. We concluded that clinical diagnoses of TMD (muscle and temporomandibular joint disorders) were not associated with different types of occlusal interferences. This study focused on a non-patient population of young adult males and the results may not be applicable for the general population.