| Summary: | Abstract Temporomandibular disorders (TMD) comprise a number of clinical problems associated with the masticatory muscles, the temporomandibular joints (TMJs), and surrounding structures. The most common clinical signs and symptoms are TMJ clicking, masticatory muscle pain and restricted range of mandibular movements. Other symptoms are pain and dysfunction of TMJ, facial pain, headache, and ear pain. The etiology of TMD is multifactorial and the association between TMD and occlusion is still controversial. The aim of this study was to investigate the prevalence of TMD in selected samples of Finnish adults and the occlusal characteristics at 12-year follow-up based on Northern Finland Birth Cohort (NFBC) 1966 subjects. NFBC 1966 cohort subjects responded to questionnaires and participated in a clinical dental examination at the age of 31 and 46 years. The sample of the occlusal characteristic measurements comprised 30 sets of study models with permanent dentition randomly selected from the NFBC 1966. Measurements were done in 2013 on dental casts and their counterparts, digital 3D models. The prevalence of TMD signs in NFBC 1966 subjects (n=1,962) was 34.2% and clinical signs of TMD were more common in female than in men. Measurements showed good agreement between the digital and manual method and excellent inter-examiner agreement when using the digital method. At 12-year follow-up, in facial pain cases anterior occlusal asymmetry and overjet were significantly increased, and midline asymmetry and left sagittal occlusal relationship were statistically significantly changed to a more abnormal relationship. In controls, the occlusal relationship showed improvement in teeth alignment in upper anterior region, midline asymmetry was statistically significantly decreased, and the left canines showed a more normal occlusal relationship. The occlusal relationships were found to be changed during adulthood in NFBC 1966 subjects in both facial pain cases and controls group. Tiivistelmä Purentaelimistön toimintahäiriöt ...
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