Wear Resistance of Resin-based Restorative Composites

Objectives: Evaluating the wear resistance of commercially available restorative resin composites after water immersion.

Methods: Seven photo-cured commercial resin composites, Gradia Direct (GD: GC Co.), Solare (SO: GC Co.), Clearfil AP-X (AP: Kuraray Medical Co.), Clearfil Majesty (CM: Kuraray Medical Co.), Beatifil II (BE: Shofu Co.), Estelite Σ (ES: Tokuyama Dental Co.), and Filtec Surpreme XT (FS: ESPE 3M) were filled into cylindrical metal sample-holder and light cured for 180 seconds. Finished and prepared ten specimens per group were subjected to the three-body-wear tests with the ACTA machine (Willytec GmbH, Germany) for 200,000 cycles after 1-day room temperature, and 180-day 37 °C water storages. The collected data (wear loss in μm) were analyzed statistically using the one-way ANOVA and Tukey's multiple comparison test as the post-hoc test.

Results: The wear values of GD (22 μm) was significantly lower when compared with other composites after 180-day water immersion (p<0.05). The AP and CM composites were measured over 50 μm wear loss after water storage.

Conclusion: GD showed the superior wear resistance. The reasons might be the components of well dispersed microfilled hybrid fillers and aliphatic DMA may play important roles in the high wear resistance. This study was supported by grant (#19592215 and 19390487) from the Ministry of Education, Science, Sports and Culture of Japan.