Condylar displacements related to dynamic and static recordings of the comfortable zone.

In a previous study it was found that the distance between the borders of the comfortable zone was considerably wider when the zone was recorded statically rather than dynamically. However, it was not reported how condylar displacements may be related to the zonal borders. Therefore, an attempt is made in the present study to translate zonal border recordings into the equivalent amount of condylar rotation. Using a dental articulator, it was found that the condyles rotated 4.96 degrees, when the comfortable zone was recorded statically, and 2.50 degrees, when the zone was recorded dynamically. The difference, 2.46 degrees, was statistically significant (P less than 0.001).