Comparison of the hardness and bond strength of different composite resin materials / 中国组织工程研究

ABSTRACT

BACKGROUND:Compared with the conventional composite resin materials, large pieces of filing composite resin materials have the features of increasing light-curing depth, decreasing the polymerization shrinkage rate and streamlining operational procedures; however, the properties of different types of large pieces of filing composite resin materials are different. OBJECTIVE:To analyze the hardness and bond strength of four kinds of composite resin materials. METHODS: Large pieces of filing composite resin Tetric EvoCeram Bulk Fil, SDR, as wel as conventional composite resin P60, Z350 were obtained. The vickers microhardness of these four kinds of composite resin materials under the light-curing depth of 2, 3, 4, 5 mm was detected. The shear bond strength between these four kinds of composite resin materials and the dentin was also detected. RESULTS AND CONCLUSION:The hardness order under different light-curing depths was P60 composite resin > Z350 composite resin > Tetric EvoCeram BulkFil composite resin > SDR composite resin, there was a significant difference between these four groups (P < 0.05). The light-cured hardness of Tetric EvoCream BulkFil and SDR composite resins was not significantly decreased with the increased cured depth. The shear bond strength of Tetric EvoCeram BulkFil and SDR composite resins was significantly higher compared with the P60 and Z350 composite resins (P < 0.05). These results demonstrate that large pieces of filing resinous materials, Tetric EvoCeram BulkFil and SDR, show better comprehensive mechanical properties and have a higher shear bond strength.