Abstract
BackgroundTo evaluate a potential correlation between flexural strength and indirect tensile strength in assessing the mechanical strength of resin composite cements.MethodsFlexural 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.ResultsExcept 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.ConclusionsFlexural 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.
Highlights
To evaluate a potential correlation between flexural strength and indirect tensile strength in assessing the mechanical strength of resin composite cements
Flexural strength tests For all materials except Panavia F2.0 (PF2) a significant higher flexural strength was recorded for dual cured specimens compared to the auto-polymerized specimens after 24 h water storage (Table 2)
Significant differences (p < 0.05) between auto-polymerization (AC) and dual-curing (DC) are marked grey auto-polymerization Multilink Implant (MLI) achieved highest values followed by DCM, PF2, Panavia 21 (P21), Panavia SA (PSA), Clearfil SA (CSA), and RelyX Unicem Automix (RXU)
Summary
To evaluate a potential correlation between flexural strength and indirect tensile strength in assessing the mechanical strength of resin composite cements. The restoration of teeth with ceramic crowns is an important aspect in oral rehabilitation. In order to provide an aesthetic outcome, silicate ceramics are the material of first choice [1]. Their mechanical strength is low [2]. The mechanical strength of silicate ceramic restorations is strongly influenced by the mechanical properties of the cement [3]. Assessing the mechanical strength of resin composite cements is important to classify these materials. In the last decades there was a strong improvement of dental luting agents. A wide range of Cassina et al Head & Face Medicine (2016) 12:29 clinical performance of these cement materials, in vitro tests prior to clinical application are required
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