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At the annual convention of the German Society of Orthodontics (DGKFO) in Mannheim, we presented jointly with Dr Chhatwani (Lüdenscheid) our newest research results.

 

The misalignment of the condyle between habitual and central occlusions in patients with and without CMD symptoms

Chhatwani S, Gebhardt PF, Chhatwani B

 

AIM

In this study, the misalignment of the condyles between a bite in habitual and centric occlusion was determined in 26 patients with and 17 patients without CMD symptoms, in order to ascertain whether the position of the condyles can have an influence on the aetiology of CMD.

 

MATERIALS AND METHODS

Diagnostic models and a squeeze bite in both habitual and roth power centric positions were provided by 43 patients (26 with CMD symptoms, 17 without).

A manual function diagnosis of the chewing muscles was carried out on all patients. Patients without tender chewing muscles or pain around the jaw area were assigned to the asymptomatic group. The CMD patients were gathered from a pool of patients who came to our practice of their own will demonstrating symptoms of CMD. Patients not experiencing pain with just isolated clicking were excluded from this group.

After the arbitrary hinge axis has been rendered by means of a face bow, the upper and lower jaws were mounted in an articulator with the help of the centric bite registration. The misalignment of the condyles was measured using a mandibular positions indicator. This allowed us to ascertain sagittal and horizontal changes for the left and right side respectively, as well as the transverse misalignment of both condyles.

 

RESULTS

The number of patients with a transverse misalignment of more than 0.5mm was much higher in the group of patients with symptoms (62%) than in the control group (12%).

There was no significant difference in the sagittal and horizontal changes for the respective left and right condyles.

 

CONCLUSION

In symptomatic and unsymptomatic CMD patients, there is no significant difference in condylar transverse misalignment between habitual and centric occlusion. This indicates that the position of the condyle can have an influence on the development of CMD, but does not exclude the possibility of an individual adaptation in a particular patient. The transversal displacement cannot be determined using hand-held models.

 

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