ULTRASONOGRAPHY VERSUS MAGNETIC RESONANCE IMAGING IN THE DIAGNOSIS OF TMJ DISORDERS

Abstract

This study was performed on 30 cases, 5 nonnal control cases and 25 patients suffering from any form ofTMJ disorder.

Full clinical data was obtained from each case. The case where subjected to the following examination: 1- Panoramic radiography

2- MR. imaging in closed and opened mouth positions

3- Ultrasonography in closed and open mouth positions.

MRI results; demonstrated that out of the 25 patients suffering from TMJ disorders, 3 (12%) demonstrated normal disc position in both closed and opened mouth positions. Eight cases (32%) demonstrated anterior disc displacement with reduction and 14(56%) cases demonstrated anterior disc displacement without reduction.

The results of ultrasonography of the 5 asymptomatic volunteers (control group) revealed the following:- 1- in the closed mouth position the distance between the superior surfuce of the condyle and the inferior surfuce of the glenoid fossa ranged between 2.8 to 5 mm with a mean of3.6 mm..

2- in the opened mouth position the distance between the superior surfuce of the condyle and the inferior surfuce of the glenoid fossa ranged between 5 to 7 mm with a mean of 5.8 mm.