Esthetic and Mechanical Durability of Direct-Filling Resin Composite

Objectives: Resin composite restorations have been widely used in dental treatments. Use of high wear resistance resin composite reduces the risk of retreatment and leads to reduction of burden on doctors and patients. Recently, GC has developed a new resin composite using nano-filler technology. In this study, we evaluated occlusal and tooth-brush wear resistance of various resin composite.
Methods: G-aenial A’CHORD (GC), Filtek Universal (3M), Tetric Prime (Ivoclar Vivadent), ceram X Spectra ST (Dentsply Sirona), Clearfil Majesty ES-II (Kuraray Noritake Dental), and Omnichroma (Tokuyama Dental) were examined in this study. Three-body wear test: it was performed with acrylic plate as antagonist and slurry mixture of PMMA and glycerin as abrasive medium by wear test equipment (TokyoGiken) for 100,000 cycles, 0.84 MPa loading. Wear value was calculated from a difference of specimen height in before and after wear test. Tooth-brush wear test: the surface of cured specimens was polished with diamond paste (dia-polisher paste, GC) to gloss of more than 90%. Then, it was brushed by toothbrush (Prospec, GC) with toothpaste (White & White, Lion)/water 1:2 weight ratio. After 12,000 brush cycles, gloss of surface was measured by glossmeter (Nihondenshoku). Results were analyzed by one-way ANOVA (p < 0.05).
Results: Three-body wear test: Most products showed wear of more than 10 micrometers. On the other hand, G-aenial A’CHORD showed wear of 4.5 micrometers, which was the smallest among these products. Tooth-brush wear test: Only the gloss of G-aenial A’CHORD was maintained at 50% after tooth-brush wear test, which was higher than 40% known to be glossy.
Conclusions: G-aenial A’CHORD shows the highest three-body and tooth-brush wear resistance property and can be expected to have long-term esthetic and clinical durability against occlusal stress.