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首页> 外文期刊>Dental materials >Flexural strength and Weibull analysis of a microhybrid and a nanofill composite evaluated by 3- and 4-point bending tests
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Flexural strength and Weibull analysis of a microhybrid and a nanofill composite evaluated by 3- and 4-point bending tests

机译：通过三点和四点弯曲试验评估微杂种和纳米填充复合材料的抗弯强度和威布尔分析

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Objectives. The aim of the present study was to evaluate the flexural strength and the Weibull modulus of a microhybrid and a nanofill composite by means of 3- and 4-point bending tests. Methods. Thirty specimens of Filtek Z250™ (3M/ESPE) and Filtek Supreme™ (3M/ESPE) were prepared for each test according to the ISO 4049/2000 specification. After 24 h in distilled water at 37 ℃ the specimens were submitted to 3- and 4-point bending tests using a universal testing machine DL2000 (EMIC) with a crosshead speed of 1 mm/min. Flexural strength data were calculated and submitted to Student''s t-test (α = 0.05) and Weibull statistics. The fractured surfaces were analyzed based on fractographic principles. Results. The two composites had equivalent strength in both test methods. However, the test designs significantly affected the flexural strength of the microhybrid and the nanofill composites. Weibull modulus (m) of Supreme™ was similar with both tests, while for 2250™, a higher m was observed with the 3-point bending test. Critical flaws were most often associated with the specimen''s surface (up to 90%) and were characterized as surface scratches/grooves, non-uniform distribution of phases, inclusions and voids. Significance. Flexural strength as measured by the 3-point bending test is higher than by the 4-point bending test, due to the smaller flaw containing area involved in the former. Despite the large difference in average filler size between the composites, the volume fraction of the filler in both materials is similar, which was probably the reason for similar mean flexural strength values and fracture behavior.
机译：目标。本研究的目的是通过3点和4点弯曲试验评估微混合材料和纳米填充复合材料的弯曲强度和威布尔模量。方法。根据ISO 4049/2000规格，为每个测试准备了30个Filtek Z250™（3M / ESPE）和Filtek Supreme™（3M / ESPE）的样品。在37℃的蒸馏水中放置24小时后，使用万能试验机DL2000（EMIC）以1 mm / min的十字头速度对样品进行3点和4点弯曲测试。计算抗弯强度数据并提交给学生的t检验（α= 0.05）和威布尔统计量。根据断裂原理分析了断裂的表面。结果。在两种测试方法中，两种复合材料的强度均相等。但是，测试设计显着影响了微混合材料和纳米填充复合材料的抗弯强度。 Supreme™的威布尔模量（m）在两个测试中均相似，而2250™在三点弯曲测试中观察到更高的m。关键缺陷最常与样品表面有关（高达90％），其特征为表面划痕/凹槽，相的不均匀分布，夹杂物和空隙。意义。通过三点弯曲试验测得的弯曲强度高于通过四点弯曲试验测得的弯曲强度，这是由于前者所涉及的较小的含缺陷区域。尽管复合材料之间的平均填料尺寸差异很大，但两种材料中填料的体积分数相似，这可能是平均抗弯强度值和断裂行为相似的原因。

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