Symmetry of elements of temporomandibular joint (TMJ)

Abstract

Objective: Introduction: Dysfunction of temporomandibular joint is present in 70-75% of orthodontic patients. Evaluation of TMJ and detailed characteristics of its elements with additional methods of examination in children and adults is necessary for clinical definition of proposed disturbances of the structure and functions of the joint. The aim of the investigation is to study morphological symmetry of TMJ in patients with dentofacial abnormalities and with dentofacial abnormalities complicated by secondary edentulism.

Patients and methods: Materials and Methods: 57 patients were involved in the examination. Based on gender principle patients' distribution was almost equal: there were 30 women and 27 men. Cone-beam computerized tomography (CBCT) Galileos (SIRONA DENTAL, Germany) was used to all patients.

Results: Results: It was done analysis of parameters (height and length) of right and left heads (condyles) of temporomandibular joint in both groups. Asymmetry of parameters of heads' length in saggital area in patients of the second group was defined. It was proved statistically (left 10,38±0,76, right 8,16±0,78).

Conclusion: Conclusions: Increase of asymmetry of length of heads of TMJ in saggital area with age was determined. It can be explained by complication of dentofacial abnormalities and the presence of secondary edentulism. Depending on bite type length of condyle, especially at prognathism (in saggital) area peculiar clinical problems with TMJ can be present due to asymmetry of condyles. The size of joint gaps of TMJ due to the presence of dentofacial abnormalities with age demonstrates compensatory ability and saves its.

Keywords: dentofacial abnormality; symmetry index; temporomandibular joint.