Can Omnichroma revoke other restorative composites? Mechanical and physical assessment of Omnichroma dental resin restorative composite: An In- vitro study.
ABSTRACT Objective: The study aimed to investigate the compressive strength, flexural strength and surface micro-hardness of Omnichroma composite. Assessment of water sorption and solubility, also color matching of Omnichroma restorations with the tooth structure was performed. Accelerated aging by thermocycling was done to investigate the effect of thermocycling on the tested properties. Materials and methods: Compressive strength was tested on sixty cylindrical specimens. Flexural strength was measured for sixty rod‑shaped specimens. Surface micro-hardness was tested for sixty disc specimens. To evaluate water sorption and solubility; sixty disc specimens were tested. To assess the color parameters (CIE Lab); class V cavities were prepared in 20 human molars and restored with Omnichroma composite. Color measurements were performed using a spectrophotometer. Tests were performed at 24 hours of storage (group I), and after thermocycling for 5000 cycles (group II), and after thermocycling for 10,000 cycles (group III). Results: There was a significant difference between groups concerning the compressive strength, flexural strength, and surface micro- hardness. The highest values were found in group I. Concerning water sorption; there was no difference detected between groups. However, for solubility testing the highest value was found in group III. Regarding the change in color the highest ∆E value was measured at group III. Conclusions: Thermocycling aging of Omnichroma composite can cause deterioration in its compressive strength, flexural strength and micro-hardness, in addition to increasing its solubility. Shade matching of Omnichroma can be adversely affected by thermocycling.
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