Chaves Fernanda Oliveira, Farias Natália Coelho de, Medeiros Luciano Marcelo de Mello, Alonso Roberta Caroline Bruschi, Di Hipólito Vinicius, D'Alpino Paulo Henrique Perlatti
Biomaterials Research Group, Universidade Anhanguera de São Paulo, São Paulo, SP, Brazil.
J Appl Oral Sci. 2015 Mar-Apr;23(2):120-8. doi: 10.1590/1678-775720130643. Epub 2014 Jul 29.
To investigate the mechanical properties of different classifications of composites indicated for posterior application as functions of the storage condition and of the energy dose.
Specimens (8 x 2 x 2 mm) were obtained according to the factors: I) Composites (3M ESPE): Filtek P60, Filtek Z350XT, and Filtek Silorane; II) Syringe storage conditions: room temperature, aged, oven, refrigerator, and freezer; and III) Energy dose: 24 J/cm(2) and 48 J/cm(2). After photoactivation, the specimens were stored at 37 ºC for 24 h. After storage, a three-point bending test was carried out in a universal testing machine at 0.5 mm/min. Flexural strength (S) and flexural modulus (E) were calculated. Data were analyzed by three-way ANOVA and Tukey's test (α = 0.05).
Different storage conditions significantly affected the silorane composite for S; conversely, no effects were noted in terms of E. The accelerated aging protocol significantly increased the S of Filtek P60 and Filtek Silorane, whereas storage in the oven significantly decreased the S for all of the composites tested. Filtek P60 was the only composite not affected by the lower storage temperatures tested for S, whereas for the silorane this parameter was impacted at the same conditions. The factor "dose" was not statistically significant.
The syringe storage at different temperature conditions proved to influence mostly the flexural strength, a clinically important characteristic considering the posterior indication of the materials tested. The silorane composite should not be stored at lower temperatures.
研究用于后牙修复的不同分类复合材料的力学性能与储存条件及能量剂量之间的关系。
根据以下因素制备标本（8×2×2毫米）：I）复合材料（3M ESPE）：Filtek P60、Filtek Z350XT和Filtek Silorane；II）注射器储存条件：室温、老化、烤箱、冰箱和冷冻室；III）能量剂量：24 J/cm²和48 J/cm²。光固化后，标本在37℃下储存24小时。储存后，在万能试验机上以0.5毫米/分钟的速度进行三点弯曲试验。计算弯曲强度（S）和弯曲模量（E）。数据通过三因素方差分析和Tukey检验进行分析（α = 0.05）。
不同的储存条件对Silorane复合材料的S有显著影响；相反，对E没有影响。加速老化方案显著提高了Filtek P60和Filtek Silorane的S，而在烤箱中储存显著降低了所有测试复合材料的S。Filtek P60是唯一一种S不受较低测试储存温度影响的复合材料，而对于Silorane，该参数在相同条件下受到影响。“剂量”因素无统计学意义。
在不同温度条件下储存注射器主要影响弯曲强度，考虑到所测试材料的后牙修复适应症，这是一个临床上重要的特性。Silorane复合材料不应在较低温度下储存。
