Occlusal characteristics in Northern Finland Birth Cohort 1966 subjects – a longitudinal study.

Thesis event information

Date and time of the thesis defence

Place of the thesis defence

Remote access: https://oulu.zoom.us/j/66787483294?pwd=Z01hTGV4VjM3SGxmdmZnT3ZvdWlOQT09

Topic of the dissertation

Occlusal characteristics in Northern Finland Birth Cohort 1966 subjects – a longitudinal study.

Doctoral candidate

DDS Heikki Kiviahde

Faculty and unit

University of Oulu Graduate School, Faculty of Medicine, Research Unit of Oral Health Sciences

Subject of study



Docent Jari Ahlberg, University of Helsinki


Professor Pertti Pirttiniemi, University of Oulu

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Occlusal characteristics in Northern Finland Birth Cohort 1966

Temporomandibular disorders (TMD) comprise a number of clinical problems associated with the masticatory muscles, the temporomandibular joints (TMJs), and surrounding structures. 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. Measurements were done on dental casts and digital 3D models.

The prevalence of TMD signs in NFBC 1966 subjects 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 increased, and midline asymmetry and left sagittal occlusal relationship were changed to a more abnormal relationship. In controls, the occlusal relationship showed improvement in teeth alignment in upper anterior region, midline asymmetry was 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.
Last updated: 1.3.2023