Cassina Gianluca, Fischer Jens, Rohr Nadja
Division of Dental Materials and Engineering, Clinic for Reconstructive Dentistry and Temporomandibular Disorders, University Hospital of Dental Medicine, University of Basel, Hebelstrasse 3, 4056, Basel, Switzerland.
Head Face Med. 2016 Nov 4;12(1):29. doi: 10.1186/s13005-016-0128-7.
To evaluate a potential correlation between flexural strength and indirect tensile strength in assessing the mechanical strength of resin composite cements.
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.
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.
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.
在评估树脂复合水门汀的机械强度时，评估弯曲强度与间接拉伸强度之间的潜在相关性。
测定了7种树脂复合水门汀（RelyX Unicem 2 Automix [RXU]、Panavia SA [PSA]、Clearfil SA [CSA]、Panavia F2.0 [PF2]、Multilink Implant [MLI]、DuoCem [DCM]、Panavia 21 [P21]）的弯曲强度（n = 5）和间接拉伸强度（n = 5）。样本采用自聚合或双重固化（P21除外），在测量前于37℃水中储存1天。另外，对4种水门汀（RXU、PSA、PF2、MLI）在固化后以及在37℃水中储存96小时后直接测量其弯曲强度和间接拉伸强度。
除PF2外，双重固化样本的弯曲强度高于自聚合样本。在间接拉伸强度试验中，仅在RXU和DCM中检测到自聚合和双重固化样本之间的差异。弯曲强度值与间接拉伸强度值之间存在一般的非线性相关性。然而，自聚合和双重固化样本的强度值通常不相关。
树脂复合水门汀的弯曲强度与间接拉伸强度相关。在高强度值时，间接拉伸试验比弯曲试验的敏感性低。结果表明，间接拉伸试验可能仅推荐作为一种筛选试验，特别是对于低或中等强度的树脂复合水门汀。
