Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Center for Dental and Oral Medicine, University of Zurich, Zurich, Switzerland.
Dent Mater J. 2010 Mar;29(2):188-92. doi: 10.4012/dmj.2009-080.
The purpose of this study is to verify the hypothesis that the hardness and flexural strength of composite resin restorative materials are correlated and similarly affected by accelerated aging. With four different composite resins (Tetric Evo Ceram, Synergy, Filtek Supreme, Quixfil), the effects of aging in distilled water at 37 degrees C or by thermal cycling (5 degrees C/55 degrees C) on Martens hardness and flexural strength were assessed. Flexural strength (n=12) was measured according to ISO 4049 immediately after light-curing and after 75 days of aging. Martens hardness (n=6) was measured in intervals up to 75 days. The results were statistically analyzed with one-way ANOVA, followed by a post hoc Bonferroni test. In all cases, the effect of aging on hardness could not be measured. The effect of aging on flexural strength was also not consistent, although it was found that thermal cycling affected flexural strength more than water storage. Martens hardness and flexural strength of composite resins are not correlated.
复合树脂修复材料的硬度和弯曲强度是相关的，并且受到加速老化的影响相似。使用四种不同的复合树脂（Tetric Evo Ceram、Synergy、Filtek Supreme、Quixfil），评估了在 37°C 蒸馏水中或通过热循环（5°C/55°C）老化对马氏硬度和弯曲强度的影响。根据 ISO 4049，在光固化后立即和老化 75 天后，对弯曲强度（n=12）进行了测量。马氏硬度（n=6）在长达 75 天的时间内进行了间隔测量。使用单因素方差分析对结果进行了统计分析，然后进行了事后 Bonferroni 检验。在所有情况下，老化对硬度的影响都无法测量。老化对弯曲强度的影响也不一致，尽管发现热循环对弯曲强度的影响大于水储存。复合树脂的马氏硬度和弯曲强度不相关。
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