수종 치관수복재료의 마모도에 관한 연구

A STUDY ON THE WEAR OF DENTAL RESTORATIVE MATERIALS

The purpose of this study was to compare the wear characteristics of Type III Gold Alloy (Degular C : Degussa AG), VMK 95 (Vita Zahnfabrik), Vitadur Alpha (Vita Zahnfabrik), IPS Empress (Ivoclar-Vivadent) and Targis (Ivoclar- Vivadent). Ten samples of each material were abraded against enamel of extracted incisors for 160,000 cycles on the wear machine. The depth of wear scars on enamel was analized with profilometer (Alpha-step 200;Tencor). And the wear of material specimen was determined with micrometer (PB-IB;Mitutoyo Co. Japan). The results obtained were as follows : 1. Type III gold alloy ($2.47{\mu}m$) and Targis ($5.89{\mu}m$) caused less wear of enamel specimens compared to VMK 95 ($75.59{\mu}m$), IPS Empress ($78.60{\mu}m$) and Vitadur Alpha ($78.89{\mu}m$) (p<0.05). 2. The wear of material specimen when opposing enamel was the lowest in type III gold alloy ($3.0{\mu}m$), followed by Targis ($69.8{\mu}m$), IPS Empress ($148.4{\mu}m$). VMK 95 ($298.0{\mu}m$) and Vitadur Alpha ($300.8{\mu}m$ exhibited the most severe wear against enamel (p<0.05).