全面均衡こう合が得られた全部床義歯の前方こう合小面の傾斜度 理論値と自動削合による実験値との比較

Abstract

In the full balanced occlusion, the inclination of protrusive occlusal facets must theoretically coincide with the direction of their protrusive movements. Actual complete dentures, however, do not always satisfy this requirement, due principally to a variety of fabrication errors. Wetherefore investigated how closely actual inclination is related to the theoretical value calculated fromthe movement.We made 5 complete dentures with the identical compensating curve and 5 others without it, forpurposes of comparison. Before the automatic milling-in process was undertaken, we measured themedial cusp angle on the second premolar and both molars. We then measured the inclination ofprotrusive facets on the same tooth. Results were as follows: 1) a significant difference in the cuspangle was noted between the two groups ; 2) the inclination of the facets nearly coincided with theirtheoretical values; 3) there was no significant difference in the inclination of the facets between thetwo groups.These results proved that the inclination theorized was valid, and that the compensating curvehad little effect on the inclination of protrusive facets obtained by the milling-in process.