DOI: 10.36347/sjds.2022.v09i07.001

Pages: 118-146

Purpose of study to investigate mechanical properties at different storage conditions for three different brands of Silorane, Microhybrid and Nanohybrid composite. Materials and methods: A total of 189 specimens were prepared, equally divided into three main groups of 63 specimens each group. The first group was rectangular bar used to study the flexural strength and modulus of elasticity, second group was Disc Shaped used to study the Vickers micro-hardness test whereas; the third group was cylindrical shaped used to study the creep specimens were stored for periods of 24 hours (saline) or one month (artificial saliva or Ethanol 70%) in an incubator. RESULTS the highest flexure strength mean value saline (137.4 ± 12.68 MPa), Saliva (109.3 ± 4.262 MPa) Ethanol lowest (72.73 ± 6.725 MPa). The difference was significant (P<0.05). The highest Young’s Modulus value saline (29.57 ± 4.2 GPa) followed by Saliva (29.13 ± 0.39 GPa) Ethanol lowest (19.64 ± 2.26 GPa). The difference was significant (P<0.05). No significant difference between saline and saliva aging (P<0.05). The highest micro-hardness mean value saline (98.74 ± 1.387 HV) followed by Saliva aging group (92.17 ± 2.109 HV) while Ethanol aging group recorded the lowest mean value (83.19 ± 1.053 HV). The difference was significant (P<0.05).Saline (24hr) aging group recorded the highest creep mean value saline (1.281 ± 0.021 %) followed by Saliva aging group (1.266 ± 0.198 %) while Ethanol lowest value (1.123 ± 0.051 %). The difference was statistically non-significant (0.05). Conclusion: The flexural strength and hardness of the silorane and methacrylate composite were significantly influenced by saliva or ethanol. The Young’s Modulus of the silorane and methacrylate composite were not significantly influenced by saliva and significantly influenced by ethanol. The creep of silorane and methacrylate composite were not significantly influenced by saliva or ethanol.