セメント合着操作の検討

Abstract

The cementation is important process in crown and bridge therapy. Faulty cementation disturbs previously established margins and occlusal relationship.In this study various devices to apply and maintain the forces used to seat complete crowns during cementation were compared with one another from the viewpoints of film thickness and stability of the mandible. Devices compared were as follows: cotton roll, wood stick, stopping and crown setter uni-and bilaterally respectively, vibration (Vibraseat), hand pressure and with no material. However, instead of dental cement a silicone impression material (injection type) was used as a luting agent.The following results were found.1. Vibra-seat, crown setter and stopping unilaterally respectively showed constantly very fine film thickness.2. Unilateral Forces were more effective than bilateral ones in order to reduce film thickness.3. Cotton roll and crown setter bilaterally respectively and wood stick uni-and bilaterally didn't show constant film thickness.4. The mandible was the stablest in stopping and the least stable in crown setter.5. There was no difference between uni-and bilaterally concerning the stability of the mandible.6. Stopping was the most comfortable for the patients and the others were at any rate uncomfortable.7. Summarily, Vibra-seat and stopping unilaterally were recommended.