ABSTRACT

To appraise influence of polymerisation of restorative dental composites on physical, mechanical and chemical properties at various setting depths. The cylindrical samples (5 mm diameter, 2.5 mm height, and n = 6) of microhybrid and nanohybrid composites were fabricated. Nanohardness was performed from the surface to the core of the sample in stages, i.e., stage 1–5. Additional chemical and physical characterisations of the study materials were performed. Differences in nanohardness, and W_sl and W_sp values were evaluated using analysis of variance (P ≤ 0.05). Nanohardness was significantly affected between stages of dental composites (P < 0.001). Only Nanohybrid™ composite exhibited nearly same formation ratio of double bonds into polymeric carbon–carbon single bonds at different stages. The Nanohybrid™ composite exhibited lowest W_sl and W_sp parameters. Nanohybrid™ may have the potential to survive a harsh oral environment for a longer time compared with other composites.

摘要

评估修复性牙科复合材料的聚合对不同设置深度的物理、机械和化学性能的影响。制造了微杂化和纳米杂化复合材料的圆柱形样品（直径 5 mm，高 2.5 mm，n = 6）。纳米硬度从样品的表面到核心分阶段进行，即阶段 1-5。对研究材料进行了额外的化学和物理表征。纳米硬度的差异，以及 W _sl和 W _sp使用方差分析评估值（P ≤ 0.05）。纳米硬度在牙科复合材料的不同阶段之间受到显着影响（P < 0.001）。只有 Nanohybrid™ 复合材料在不同阶段表现出几乎相同的双键形成聚合碳-碳单键的比率。Nanohybrid™ 复合材料表现出最低的 W _sl和 W _sp参数。与其他复合材料相比，Nanohybrid™ 可能有可能在恶劣的口腔环境中存活更长时间。