こう合器上でのこう頭かん合位の再現性からみたこう合記録材料の精度について

Abstract

The purpose of this study was to investigate the accuracy of interocclusal recording materials that reproduced intercuspation. Two types of stone casts for measuring were selected and mounted on the verticulator. One stone cast (Crown type) that was prepared for a single crownmaintained stable intercuspation. Another stone cast (Bridge type) that was prepared for a fixed partial denture could not maintain stable intercuspation. For interocclusal records, which were made from President Jet Bite, Exabite, Ramitec, Xanthano, Impression Paste and New Plastone between the upper and lower stone casts, the occlusal heights of the stone casts on the left molar of the abutment side, anterior teeth and right molar were measured using an IP-Checker. The President Jet Bite, Exabite and Ramitec elastic materials were studied to determine the influence of the recording extents.The results were as follows:1. The occlusal height of both stone casts was higher for the left molar and the anterior teeth than for the right molar.2. The occlusal height of the Bridge type was higher than the Crown type.3. The results suggest that interocclusal records made from addition type silicone impression materials have the best reproducibility of intercuspation and a smaller recording range has greater reproducibility of intercuspation.