دراسة مقارنة بين مادتي الكومبوزيت السيلورانيو الكومبوزيت الحاوي على ميتاكريلات من حيث بعض الخواص الميكانيكية

Background & Objective: Ring-opening monomers with a reduced shrinkage stress “silorane are being used as matrix resins for recently introduced dental composites. Thisstudy aimed to analyzethe mechanical behavior(Flexural StrengthFS, Abrasion Resistance AR) of the silorane-based composite (Filtek P90) in comparison to two methacrylate-based composites (Tetric- Evo Ceram & packable hybridTetric Ceram HB). Material & Methods: specimens were fabricated following ISO 4049,/45/ in a form of bar (25x2x2mm)&/45/cylindrical (6x12 mm), (n = 15). Specimenswere made according to manufacturers’ recommendations. Thetests were then measured using the 3-point bending test by Testometric M350-5CT for Flexural Strength& Abrasion Tester APH-40 for Abrasion Resistance. ANOVA &Bonferroni tests are used for statistical study (P=0.05). Results: No significant differences were registered between the three materials in Flexural Strength average (P>0, 05).However, the silorane-based material had greater Abrasion Resistance than the methacrylate composites(TetricEvoCeram&TetricHB), and TetricEvoCeram had significantly greater AR than TetricHB composite (p < 0.05). Conclusion: Siloranes exhibited good mechanical properties comparable to those of clinically successful methacrylate-based composite materials