Background To evaluate a potential correlation between flexural strength and indirect tensile strength in assessing the mechanical strength of resin composite cements. Methods Flexural strength ( n =?5) and indirect tensile strength ( n =?5) of 7 resin composite cements (RelyX Unicem 2 Automix [RXU], Panavia SA [PSA], Clearfil SA [CSA], Panavia F2.0 [PF2], Multilink Implant [MLI], DuoCem [DCM], Panavia 21 [P21]) were determined. Specimens were either auto-polymerized or dual-cured (except P21) and stored in water at 37?°C for 1?day prior to measurement. Flexural and indirect tensile strength of 4 cements (RXU, PSA, PF2, MLI) was additionally measured directly after curing and after 96?h water storage at 37?°C. Results Except for PF2, dual-cured specimens achieved higher flexural strength than auto-polymerized specimens. In the indirect tensile strength test differences in auto-polymerized and dual-cured specimens were only detected for RXU and DCM. A general non-linear correlation was found between flexural and indirect tensile strength values. However, strength values of auto-polymerized and dual-cured specimens did not generally correlate. Conclusions Flexural strength and indirect tensile strength of resin composite cements are correlated. At high strength values the indirect tensile test is less sensitive than the flexural test. The results suggest that the indirect tensile test may only be recommended as a screening test especially for low or medium strength resin composite cements.
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机译：背景技术评价抗弯强度与间接拉伸强度之间的电位相关性评估树脂复合水泥的机械强度。方法弯曲强度（n =Δ5）和间接拉伸强度（n =Δ5）的7树脂复合水泥（relyx unicem 2 automix [rxu]，panavia sa [psa]，clearfil sa [csa]，panavia f2.0 [ PF2]，MultiLink Inclulant [MLI]，DuoceM [DCM]，Panavia 21 [P21]）是确定的。试样是自融合的或双固化（除P21外），并在37℃下储存在水中在测量前1℃。在固化后另外在固化后和在37℃下储存后的弯曲和间接拉伸强度为4个水泥（RXU，PSA，PF2，MLI），并在96℃储存后。结果除PF2外，双固化试样的弯曲强度比自动聚合标本较高。在间接拉伸强度试验中，仅检测rxu和DCM的自聚合和双固化标本中的差异。在弯曲和间接拉伸强度值之间发现了一般的非线性相关性。然而，自聚合和双固化标本的强度值通常不相关。结论树脂复合水泥的抗弯强度和间接拉伸强度是相关的。在高强度值下，间接拉伸试验比弯曲试验更敏感。结果表明，间接拉伸试验只能推荐作为筛选试验，特别是对于低或中等强度树脂复合水泥。
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