Mechanical Properties of Novel Resin Composite with Structural Coloration

Objectives: The objective of this study was to evaluate the mechanical properties of the resin composite (RBC) with structural coloration by comparison with other brands.
Methods: The following five resin composites (RBCs) were used: Estelite Sigma Quick (ESQ, shade A3, Tokuyama Dental), Majesty ES-2 (ME, shade: A3, Kuraray Noritake Dental), Beautifil 2 (BF, shade: A3, Shofu), Essentia (ES, shade: U, GC) and OMNICHROMA (OC, Tokuyama Dental, with structural coloration). Flexural strength and depth of cure were determined according to ISO 4049. Flexural modulus was measured using Autograph (AG-1: Shimadzu Corporation, Japan) and was calculated using the following equation: Flexural modulus (GPa) = F / ΔI * L³ / 4 * W * T³ (F: test force, ΔI: bending deflection, L: distance between fulcrums, W: test specimen length, T: test specimen thickness). Cylindrical specimens (4mm diameter, 3mm thickness) for compressive strength test were cured according to the manufacturer’s recommendation using light-curing unit (LCT, Kerr, 800mW/cm²). After polymerization, all specimens were stored in water at 37 degree celsius for 24 hours, and compressive strength was measured using Autograph (AG-1: Shimadzu Corporation, Japan). The data was statistically analyzed using SPSS (version 21, IBM) with one-way ANOVA (p<0.05).
Results: The flexural strength, depth of cure and compressive strength values of OC showed the same or significantly higher value, showing the highest value, compared with the other brands.
Conclusions: In this study, OC with Structural coloration showed the same or significantly higher mechanical properties compared with the other brands.