University of Geneva, Geneva, Switzerland.
J Adhes Dent. 2013 Jun;15(3):245-50. doi: 10.3290/j.jad.a28603.
To evaluate the relation between the linear displacement (LD), shrinkage force (SF) and marginal adaptation of a methacrylate- and a silorane-based composite.
The LD and SF of 8 samples made of Filtek Supreme XT (methacrylate-based composite) and Filtek Silorane (silorane-based composite) were measured for 180 s from the start of polymerization. Large bulk-filled Class I cavities were restored with both resin composites, and two C-factors were simulated by applying the same adhesive system in different ways: the Silorane System Adhesive (SSA) was applied on enamel and dentin (C-factor 3.5) or only on enamel margins (C-factor of 0.4). Percentages of continuous margins (%CM) were quantitatively assessed with SEM before and after simultaneously loading with 1.2 million mechanical occlusal cycles (49 N; 1.7 Hz) and 3000 thermal cycles (5°C to 50°C) under dentinal fluid simulation.
Significantly lower scores of LD and SF were observed for Filtek Silorane (LD: 12.0 µm ± 1.3, SF: 13.7 N ± 1.0) than for Filtek Supreme XT (LD: 25.0 µm ± 0.6, SF: 36.3 N ± 2.9). Both variables, ie, composite type and C-factor, had a significant effect on marginal adaptation (p < 0.05). In the groups with high C-factor (SSA was applied on the entire cavity surface) percent of continuous margin (%CM) (mean ± SD) before and after loading, respectively, was 24.4 ± 16.6 and 2.1 ± 2.4 for Filtek Supreme XT, and 58.8 ± 9.9 and 35.4 ± 4.1 for Filtek Silorane. When adhesion was confined to enamel margins (lower C-factor), %CM before and after loading, respectively, increased to 76.1 ± 9.6 and 64.2 ± 11.5 for Filtek Supreme XT, and 96.6 ± 1.7 and 94.2 ± 2.1 for Filtek Silorane.
The silorane-based composite exhibited significantly lower shrinkage forces and better marginal adaptation than did the methacrylate-based composite.
评估一种甲基丙烯酸酯基复合材料和一种硅烷酮基复合材料的线位移（LD）、收缩力（SF）和边缘适应性之间的关系。
从聚合开始，测量 8 个 Filtek Supreme XT（甲基丙烯酸酯基复合材料）和 Filtek Silorane（硅烷酮基复合材料）样本的 LD 和 SF 180 秒。用两种树脂复合材料制备大体积充填的 I 类腔，并通过不同的方式应用相同的粘结系统模拟两种 C 因子：Silorane System Adhesive（SSA）应用于牙釉质和牙本质（C 因子 3.5）或仅应用于牙釉质边缘（C 因子 0.4）。在模拟牙本质液的情况下，同时进行 120 万次机械咬合循环（49 N；1.7 Hz）和 3000 次热循环（5°C 至 50°C）后，使用 SEM 定量评估边缘连续性百分比（%CM）。
Filtek Silorane 的 LD 和 SF 评分明显低于 Filtek Supreme XT（LD：12.0 µm ± 1.3，SF：13.7 N ± 1.0）（LD：25.0 µm ± 0.6，SF：36.3 N ± 2.9）。复合类型和 C 因子这两个变量均对边缘适应性有显著影响（p < 0.05）。在 C 因子较高的组（SSA 应用于整个腔表面），加载前后的连续边缘百分比（%CM）（平均值 ± SD）分别为 Filtek Supreme XT 24.4 ± 16.6 和 2.1 ± 2.4，Filtek Silorane 为 58.8 ± 9.9 和 35.4 ± 4.1。当粘结仅限于牙釉质边缘（较低的 C 因子）时，加载前后的%CM 分别增加到 Filtek Supreme XT 的 76.1 ± 9.6 和 64.2 ± 11.5，Filtek Silorane 的 96.6 ± 1.7 和 94.2 ± 2.1。
与甲基丙烯酸酯基复合材料相比，硅烷酮基复合材料的收缩力明显较低，边缘适应性更好。
