[Studies on the reliability of axiographic recordings using the SAS system]

The objective of this study was to compare the differences in the electronic axiographic tracings within one axiographic examination and the differences between two axiographies, with respect to the reliability of their length, curvature and inclination values. 22 patients with varying degrees of TMJ dysfunction were examined using the SAS system after Meyer/Dal Ri. The results indicated a high degree of reliability within one axiography, but a remarkably reduced reliability when comparing two axiographies. In both comparisons maximal mouth opening was significantly less reliable than protrusive and lateral movements, irrespective of whether these movements were occlusally guided or TMJ-guided. No significant differences could be found between occlusally and TMJ-guided movements and between patients with different functional status values (Helkimo dysfunction index 0 and 1 as against 2 and 3).