IADR Abstract Archives
Wear Resistance Evaluation of Adhesive Resin Cement for Esthetic Restorations
Objectives: Recently, CAD/CAM and metal-free restorations are increasing. The wear of exposed cement at margins of inlay restoration tends to lead to the fracture of enamel or restoration, and the roughness of the resin cement surface causes the marginal discoloration. The purpose of this study was to evaluate the surface roughness and occlusal wear of adhesive resin cement after three-body wear test.
Methods: Four adhesive resin cements(Multilink-Automix(Ivoclar), RelyX-Ultimate(3M-ESPE), PANAVIA-V5(Kuraray-Noritake), and G-CEM-LinkForce(GC)) were filled into a mold with a cylindrical tip(2.1mm diameter) and cured by self-curing or light-curing mode according to the manufacturers’ instructions. All specimens were stored in 37degC distilled water for 24hours. They were attached at the testing machine(Tokyo-Giken, K842-01) and three-body wear test was performed onto PMMA plate using a slurry(PMMA powder and glycerol mixture) under a load of 300g for 100,000 cycles(n=7). The surface roughness and occlusal wear of the specimen’s tip were measured by laser microscope(KEYENCE, VK-X200) and micrometer. The surface of the tip was also observed using a FE-SEM(Hitachi, SU-70).
Results: In the following table, different alphabets in the same column indicated significant difference(p<0.05, one-way ANOVA and Turkey test). After three-body wear test, Multilink-Automix and G-CEM-LinkForce showed lower surface roughness compared to RelyX-Ultimate and Panavia-V5. G-CEM-LinkForce also showed significantly higher wear resistance compared to all other materials. The results of SEM observation indicated that the occlusal wear decreased when the filler of resin cement was small and dispersed homogeneously.
Conclusions: In this study, the filler size affects the surface roughness and the wear resistance, and it is suggested that the adhesive resin cement with small and homogeneously distributed filler particles has these good characteristics for esthetic restorations.
Methods: Four adhesive resin cements(Multilink-Automix(Ivoclar), RelyX-Ultimate(3M-ESPE), PANAVIA-V5(Kuraray-Noritake), and G-CEM-LinkForce(GC)) were filled into a mold with a cylindrical tip(2.1mm diameter) and cured by self-curing or light-curing mode according to the manufacturers’ instructions. All specimens were stored in 37degC distilled water for 24hours. They were attached at the testing machine(Tokyo-Giken, K842-01) and three-body wear test was performed onto PMMA plate using a slurry(PMMA powder and glycerol mixture) under a load of 300g for 100,000 cycles(n=7). The surface roughness and occlusal wear of the specimen’s tip were measured by laser microscope(KEYENCE, VK-X200) and micrometer. The surface of the tip was also observed using a FE-SEM(Hitachi, SU-70).
Results: In the following table, different alphabets in the same column indicated significant difference(p<0.05, one-way ANOVA and Turkey test). After three-body wear test, Multilink-Automix and G-CEM-LinkForce showed lower surface roughness compared to RelyX-Ultimate and Panavia-V5. G-CEM-LinkForce also showed significantly higher wear resistance compared to all other materials. The results of SEM observation indicated that the occlusal wear decreased when the filler of resin cement was small and dispersed homogeneously.
Conclusions: In this study, the filler size affects the surface roughness and the wear resistance, and it is suggested that the adhesive resin cement with small and homogeneously distributed filler particles has these good characteristics for esthetic restorations.