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Mechanical Properties of Elastomeric Impression Materials: An In Vitro Comparison

机译:弹性印象材料的机械性能:体外比较

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Purpose.Although new elastomeric impression materials have been introduced into the market, there are still insufficient data about their mechanical features. The tensile properties of 17 hydrophilic impression materials with different consistencies were compared.Materials and Methods.12 vinylpolysiloxane, 2 polyether, and 3 hybrid vinylpolyether silicone-based impression materials were tested. For each material, 10 dumbbell-shaped specimens were fabricated (n=10), according to the ISO 37:2005 specifications, and loaded in tension until failure. Mean values for tensile strength, yield strength, strain at break, and strain at yield point were calculated. Data were statistically analyzed using one-way ANOVA and Tukey’s tests (α=0.05).Results.Vinylpolysiloxanes consistently showed higher tensile strength values than polyethers. Heavy-body materials showed higher tensile strength than the light bodies from the same manufacturer. Among the light bodies, the highest yield strength was achieved by the hybrid vinylpolyether silicone (2.70 MPa). Polyethers showed the lowest tensile (1.44 MPa) and yield (0.94 MPa) strengths, regardless of the viscosity.Conclusion.The choice of an impression material should be based on the specific physical behavior of the elastomer. The light-body vinylpolyether silicone showed high tensile strength, yield strength, and adequate strain at yield/brake; those features might help to reduce tearing phenomena in the thin interproximal and crevicular areas.
机译:目的:尽管新的弹性印模材料已投放市场,但有关其机械特性的数据仍然不足。比较了17种不同稠度的亲水性印模材料的拉伸性能。材料和方法。测试了12种基于乙烯基聚硅氧烷,2种聚醚和3种杂化乙烯基聚醚有机硅的印模材料。对于每种材料,根据ISO 37:2005规格制造10个哑铃形试样(n = 10),并施加拉力直至失效。计算抗拉强度,屈服强度,断裂应变和屈服点应变的平均值。使用单向方差分析和Tukey检验(α= 0.05)对数据进行统计分析。结果。乙烯基聚硅氧烷始终显示出比聚醚更高的拉伸强度值。与同一制造商生产的轻型车身相比,重型车身的抗张强度更高。在轻体中,杂化乙烯基聚醚有机硅(2.70 MPa)实现了最高的屈服强度。无论粘度如何,聚醚均表现出最低的拉伸强度(1.44 MPa)和屈服强度(0.94 MPa)。结论。压印材料的选择应基于弹性体的特定物理性能。轻质乙烯基聚醚硅氧烷显示出高的拉伸强度,屈服强度和屈服/制动时足够的应变;这些特征可能有助于减少薄的近端和小孔区域的撕裂现象。

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