임플란트 고정체에 대한 기성 지대주와 맞춤형 CAD-CAM 지대주의 적합에 관한 비교

Abstract

ABSTRACT Currently, custom-made abutment using CAD-CAM is produced not only in foreign countries but also in Korea. Suspicion is growing a lot on precision of domestically produced CAD-CAM custom-made abutment and stability of screws. Therefore, in this study, domestically manufactured implant fixture are selected and Ready-made abutment, CAD-CAM custom-made abutment manufactured from the same company, domestically manufactured CAD-CAM custom-made abutment are fabricated and stability and fitness between implant fixtures, abutment and screw are to be studied. Working casts are fabricated and then Ready-made abutment (Transfer abutment, Osstem, Busan, Korea), CAD-CAM custom-made abutment(Smart abutment, Osstem, Busan, Korea) and CAD-CAM custom-made abutment (Myplant, Raphabio Co., Seoul, Korea) were fabricated five each and screws used were provided by each company. Fixture and abutments were tightening with 30Ncmaccording to the manufacturer's instruction and then Preloding reverse torque value were measured 3 times repeatedly. Using Kruskal-Wallis test(P<0.05), significant relation between abutments were analyzed. After specimens were embedded into epoxy resin, wet cutting and polishing were performed and FE-SEM imaging was performed, on the contact interface. The results were as follows: 1. CAD-CAM custom-made abutment(Myplant abutment) manufactured domestically showed lower Preloding reverse torque value with statistically significant difference than the Ready-made abut- ment(Transfer abutment) and CAD-CAM custom-made abutment (Smart abutment) manufactured from the same company 2. Ready-made abutment(Transfer abutment) and CAD-CAM custom- made abutment(Smart abutment) manufactured from the same company showed fine fitness in the fixture-abutment, fixture- screw, abutment-screw interface. However, CAD-CAM custom-made abutment(Myplant abutment) manufactured domestically showed marginal gap in the fixture-abutment interface. Conclusively, in domestically manufactured CAD-CAM custom-made abutment(Myplant abutment) the Preloding torque value is measured low and the fitness between fixture and abutment decreased compared to that in Ready-made abutment(Transfer abutment) or CAD-CAM custom-made abutment(Smart abutment) manufactured from the same company