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A Follow-up Study of Radiographic Findings in the Mandibular Condyles of Orthodontically Treated Patients and Associations with TMD

Department of Dental Radiology, Institute of Dentistry, PI 41 (Mannerheimintie 172), FIN-00014 University of Helsinki, Helsinki, Finland

M. Könönen

Department of Prosthetic Dentistry, Institute of Dentistry, PI 41 (Mannerheimintie 172), FIN-00014 University of Helsinki, Helsinki, Finland

M. Nyström

Department of Pedodontics and Orthodontics, Institute of Dentistry, PI 41 (Mannerheimintie 172), FIN-00014 University of Helsinki, Helsinki, Finland

Our earlier studies have shown that some radiographic structural findings in the mandibular condyles are more common in orthodontically treated populations than in normal populations. To test the hypothesis that these findings are stable, we studied condylar findings in panoramic radiographs longitudinally in 39 subjects and in 39 sex- and age-matched controls. The subjects had condylar findings at the end of orthodontic treatment at about 15 years of age; no such findings were seen in the controls. The subjects and controls were re-examined radiographically about 12 years after the posttreatment radiographic examination.

We also tested the hypothesis that radiographic condylar findings are associated with temporomandibular disorders (TMD). No statistically significant differences were found between subjects and controls in terms of reported subjective TMD symptoms. Clinically, the subjects had temporomandibular joint (TMJ) crepitation significantly more frequently (27%) than controls (8%) (p < 0.05). Crepitation correlated with some reported symptoms and clinical signs, suggesting that osteoarthrosis might have been an important etiological factor for TMD in the present subjects.

At the follow-up examination, radiographic condylar findings were seen in 25 subjects and in four controls (p < 0.001). The condylar findings varied greatly between the time of orthodontic treatment and follow-up in the subjects. The findings had become more severe in 49% of the subjects, more often in females than in males (p < 0.05), whereas in 28% of the subjects the condylar findings had disappeared. Although the radiographic findings after orthodontic treatment fluctuated with age, in most adolescents with changes in their condyles, these findings remained constant or became more severe. It should be emphasized, however, that although there were certain associations between radiographic findings and TMD, the subjective symptoms and clinical signs seemed to cause the subjects no or only minor problems.

Key Words: orthodontics • radiography (panoramic) • temporomandibular joint

Journal of Dental Research, Vol. 74, No. 9, 1571-1576 (1995)
DOI: 10.1177/00220345950740091101


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