Hegde Mithra N, Hegde Priyadarshini, Bhandary Shruthi, Deepika K
Department of Conservative Dentistry And Endodontics, A.B. Shetty Memorial Institute Of Dental Sciences, Deralakatte, Mangalore, India.
J Conserv Dent. 2011 Jan;14(1):36-9. doi: 10.4103/0972-0707.80734.
The purpose of the study is to assess and compare compressive strength of newer nanocomposites (FiltekZ350, Ceram X Mono, Ceram X Duo) with microhybrid (Tetric Ceram) and to compare difference in compressive strength of newer nanocomposites.
Forty eight specimens of composite were fabricated using customized biparpite brass mold measuring 5mm x 5mm and were grouped with twelve specimens in each Group I : Tetric Ceram, Group II: Filtek Z 350, Group III : Ceram X Mono, Group IV : Ceram X Duo. Composite resins are placed in cylindrical recesses and covered with mylar strip and are cured using QHL light curing unit. Compressive strength is evaluated using Instron machine. Results are statistically analyzed using One way Anova and Student t test. Analysis demonstrated that nanocomposites have better compressive strength than micro hybrid (P<0.001).
Within the limitations of the study, it can be concluded that nanocomposites have better compressive strength than microhybrid composite and nanocomposite showed optimal compressive strength of 312 - 417 Mpa.
本研究旨在评估并比较新型纳米复合材料（Filtek Z350、Ceram X Mono、Ceram X Duo）与微混合复合材料（Tetric Ceram）的抗压强度，并比较新型纳米复合材料之间抗压强度的差异。
使用定制的尺寸为5mm×5mm的双瓣黄铜模具制作48个复合材料样本，每组12个样本，分组如下：第一组：Tetric Ceram；第二组：Filtek Z 350；第三组：Ceram X Mono；第四组：Ceram X Duo。将复合树脂置于圆柱形凹槽中，用聚酯薄膜条覆盖，并用QHL光固化机固化。使用英斯特朗材料试验机评估抗压强度。结果采用单因素方差分析和学生t检验进行统计学分析。分析表明，纳米复合材料的抗压强度优于微混合复合材料（P<0.001）。
在本研究的局限性范围内，可以得出结论，纳米复合材料的抗压强度优于微混合复合材料，纳米复合材料的最佳抗压强度为312 - 417兆帕。
