Page 25 - Directions for the manipulation of the Gysi adaptable articulator

21 Measuring The Lateral Paths in Degrees The Lateral Path Register is now laid on some surface which permits the tracings to be clearly seen. With a ruler, a straight line is drawn from the resting point of the condyle on one tracing to the resting point of the condyle on the other tracing. By means of a little square such as is used for mechanical drawing, a right angle is erected on this base line at each of these points. If now the little Degree Plate, which accompanies the articulator be placed with its sharp point at the resting place of the condyle and its o° side be parallel with the right angle erected on the base line, it requires only that the lateral path tracing should be prolonged by the use of a ruler or pencil, to measure its inclination from a straight line in degrees. The results of this method are shown in illustration No. 21. 111. No, 21. Lateral condyle paths recorded and strengthened. Line drawn from "restinij point" in one path to "resting point " in the other, and perpendiculars erected at these points. Angles may be measured with the little plate used for measur- ing forward paths. The tracings of the two lateral paths in the same mouth may show very wide variation in degrees. One may be much inclined and the other very little. If, however, the measurements have been properly taken, this need cause no uneasiness.