THE EFFECT OF PARAFUNCTION ON CONDYLAR ASYMMETRY IN PATIENTS WITH TEMPOROMANDIBULAR DISORDERS

This study was undertaken to examine the relationship between condylar asymmetry and parafunction in patients with temporomandibular disorde rs (TMD). Twenty-eight patients with TMD and parafunction and 30 patie nts with TMD hut no parafunction were examined. A panoramic radiograph was obtained for each patient and from this the condylar asymmetry de termined. The group with parafunction showed a significantly (P < 0.00 5) higher asymmetry index than did the group with no noticeable parafu nction. Patients were grouped into the following age ranges: 10-19 yea rs, 20-29 years, 30-39 years, and 40 + years. The mean asymmetry index was determined for each age range for both groups of patients. The gr oup of patients with TMD and parafunction had a higher mean asymmetry index in all the age ranges studied. This suggests that muscle hyperac tivity may be a factor in the increased asymmetry found in patients wi th TMD.