Research on effects of preheating on the mechnical properties of two resin composites / 中国医学装备

Objective:To investigate the effect of preheating on the microhardness and compressive strength of two resin composites. Methods: Specimens were fabricated from one microhybrid composite resin(Filtek Z250, 3M ESPE, St. Paul, MN, USA)and one nanohybrid composite resin (Filtek Z350, 3M ESPE, St. Paul, MN, USA), and stored at two different temperature(23℃, 40℃). The microhardness and compressive strength were tested after cured. Data obtained were analyzed using two-way analysis of variance. Results:For two composites, the preheated specimens have higher microhardness and compressive strength value than that stored at room temperature. Conclusion:Preheating can improve the mechnical properties of resin composite.