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首页> 外文期刊>The Journal of Prosthetic Dentistry >Viscoelastic behavior and fracture toughness of six glass-ionomer cements.
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Viscoelastic behavior and fracture toughness of six glass-ionomer cements.

机译：六种玻璃离聚物水泥的粘弹性行为和断裂韧性。

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STATEMENT OF PROBLEM: Viscoelastic behavior can influence the fracture properties of glass ionomers, which is of clinical relevance. Glass-ionomer cements can display viscoelastic behavior, defined as having displacement rate- or strain rate-dependent mechanical properties. Understanding and describing the viscoelastic behavior of glass ionomers is important to understanding their clinical behavior. PURPOSE: The purpose of this study was to evaluate the viscoelastic behavior of 6 glass-ionomer cements and determine whether there was a correlation to fracture toughness. MATERIAL AND METHODS: Three conventional glass-ionomer cements (alpha-Silver, alpha-Fil, and Ketac-Molar) and 3 resin-modified glass-ionomer cements (Vitremer, Fuji II LC, and Photac-Fil Quick) were evaluated using measurements of compressive strength (CS), flexural strength (FS), and diametral tensile strength (DTS) at displacement rates of 0.5, 1.0, 1.5, and 2.0 mm/min. The CS and DTS specimens were cured in glass tubes and cut to 4 x 6-mm and 4 x 2-mm disk-shaped specimens, respectively. The FS specimens were cured in bar molds (2 x 2 x 15 mm). The fracture toughness (FT) specimens were cured in a minicompact mold to obtain precracked specimens. The mechanical testing results were compared statistically using generalized linear model/analysis of covariance and the Ryan-Einot-Gabriel-Welsch multiple range test at the alpha=.05 level. RESULTS: For all 3 mechanical properties, there was a displacement-rate dependence on the mechanical property. However, there were no differences in the displacement-rate dependence based on the type of material-conventional glass ionomer or resin-modified glass ionomer-for any of the mechanical properties. Only for FS test was there a significant difference based on the brand of material. There was no statistical difference in FT among the glass-ionomer cements tested, although the resin-modified glass ionomers tended to display higher FT. CONCLUSION: A larger sample size and a much wider range of crosshead speeds are necessary to support a correlation between viscoelastic behavior and FT.
机译：问题陈述：粘弹性行为会影响玻璃离聚物的断裂性能，这与临床有关。玻璃离聚物粘固剂可以显示粘弹性行为，定义为具有取决于位移速率或应变速率的机械性能。理解和描述玻璃离聚物的粘弹性行为对于理解其临床行为很重要。目的：本研究的目的是评估6种玻璃离聚物水泥的粘弹性行为，并确定其是否与断裂韧性相关。材料和方法：使用测量方法评估了三种常规的玻璃离聚物水泥（α-银，α-Fil和Ketac-摩尔）和3种树脂改性的玻璃离聚物水泥（Vitremer，Fuji II LC和Photac-Fil Quick）。位移速率为0.5、1.0、1.5和2.0 mm / min时的抗压强度（CS），抗弯强度（FS）和径向拉伸强度（DTS）的平均值。 CS和DTS样品在玻璃管中固化，分别切成4 x 6毫米和4 x 2毫米的盘状样品。 FS样品在棒形模具（2 x 2 x 15毫米）中固化。断裂韧性（FT）样品在微型模具中固化以获得预裂样品。机械测试结果使用广义线性模型/协方差分析和Ryan-Einot-Gabriel-Welsch多范围测试在α= .05水平进行了统计比较。结果：对于所有3种机械性能，位移率均取决于机械性能。但是，对于任何机械性能，基于材料的传统玻璃离聚物或树脂改性的玻璃离聚物的位移率依赖性均无差异。仅对于FS测试，基于材料的品牌才存在显着差异。尽管树脂改性的玻璃离聚物趋向于显示较高的FT，但在测试的玻璃离聚物粘固剂中FT的统计差异无统计学意义。结论：需要更大的样本量和更大范围的十字头速度来支持粘弹性行为与FT之间的相关性。

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