Self-adhesive cements contain acidic monomers that may compromise curing and consequently the mechanical properties when compared to traditional non-adhesive cements.
Objectives: This study evaluated the three-point bending flexural strength of self-adhesive resin cements (Rely X Unicem – 3M ESPE, G-Cem – GC, Bis-Cem –Bisco) compared to conventional non-adhesive resin cements (Calibra – Dentsply, Multilink Sprint –Ivoclar Vivadent, Panavia F2.0 – Kuraray).
Methods:
Five rectangular specimens (25×2×2 mm) were prepared from each cement. Light-curing was carried out immediately after mixing and dispensing using a conventional QTH light-curing unit (Optilux 401) with a power density of 500 mW/cm2 and placed in distilled water at 37 °C for 48 hours. The flexural strength was determined in a Instron universal machine (Model 4411, Instron Corp., Canton, MA) at 0.75 mm/min. Data were submitted to one-way ANOVA and Student Newman Keuls (P< 0.05).
Results: Mean flexural strength and standard deviation are presented in the table. Same letters indicate no differences between groups
Material | GCem | RelyX Unicem | Multlink Sprint | BisCem | Panavia F 2.0 | Calibra |
Flexural Strength- Mpa (SD) | 47.7 (16.0)c | 76.7 (13.0)b | 104.9 (8.8)a | 88.7 (8.5)a,b | 106.6 (21.2)a | 91.2 (14.4)a,b |
In general, conventional cements presented higher flexural strength than self-adhesive ones. Among the self-adhesive, the weakest material was G-Cem followed by Unicem and BisCem that were not different from one another.
Conclusions: Self-adhesive resin cements presented lower flexural strength than conventional, non- adhesive resin cements. (Grants number - CAPES# O565-07-5 – CITYT/FEDER:MAT04-06872-C03-02).