Mechanical Properties of a Flowable Resin Composite With Structural Coloration

Objectives: The objective of this study was to evaluate the mechanical properties of the resin composite with structural coloration by comparison with other brands.
Methods: The following five resin composites were used: OMNICHROMA (OC, Tokuyama Dental, with structural coloration), Neo Spectra ST flow (NS, shade: A3, Dentsply Sirona), Beautifil flow plus X F03 (BF, shade: A3, Shofu), Tetric Evo Flow (TE, shade: A3, Ivoclar) and OMNICHROMA FLOW (OCF, Tokuyama Dental, with structural coloration). Flexural strength and depth of cure were cured according to the manufacturer’s recommendation using the light-curing unit (LCT, Kerr, 800mW/cm²) and determined according to ISO 4049. Flexural modulus was measured using the universal testing machine (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 the 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 the universal testing machine (Autograph AG-1: Shimadzu Corporation, Japan). The data was statistically analyzed using the statistical analysis software (SPSS, version 21, IBM) with one-way ANOVA (p>0.05).
Results: Flexural strength of OCF showed no significant difference compared with OC and competitive other products. Compressive strength of OCF showed significantly higher than BF. Depth of cure of OCF showed significantly higher than those of competitive other products.
Conclusions: In this study, mechanical properties of OCF showed equal to those of OC and competitive other flowable resin composites in a short curing time.