Cam fiber ilave edilen iki farkl geçici restoratif materyalin transvers dayankllnn, elastikiyet modülünün ve maksimum eilme miktarnn incelenmesi

Amaç: Bu çalmann amac, polietil metakrilat (PEMA) ve bis-akril kompozit esasl iki geçici kron-köprü materyaline farkl konsantrasyonlarda cam fiber ilavesinin transvers dayanma, maksimum eilmeye ve elastikiyet modülüne etkisini incelemektir. Materyal Metot: 3 mm boyutunda ksa kesilmi E-cam fiber PEMA ve bis-akril kompozit esasl iki geçici kron-köprü materyaline % 1 ve % 2 orannda ilave edildi (n=10). Fiber ilavesi yaplmayan bis-akril ve PEMA örnekleri kontrol grubu olarak kullanld (n=10). Toplamda 60 adet örnee 1mm/dak balk hz ile Instron Universal test cihaznda 3 nokta bükülme kuvveti uyguland. Transvers dayanm, maksimum eilme ve elastikiyet modülü deerleri hesapland: Her gruptan 1’er örnek scanning elektron mikroskobunda incelendi. statistiksel analiz Kruskal-Wallis testi ile çoklu karlatrmalar ise Siegel-Castellan testi ile yapld. Bulgular: Bis-akril kompozitin elastikiyet modülü ve maksimum eilme özellikleri PEMA’ya göre daha iyi bulunmutur. Ancak her iki materyalin transvers dayanmlar arasnda fark bulunamam tr. Bis-akril kompozit grubuna % 1 ve % 2 cam fiber ilavesi ve PEMA grubuna % 1 cam fiber eklenmesi maksimum eilme, elastikiyet modülü ve transvers dayanm etkilememitir. PEMA grubuna %2 cam fiber ilavesi, maksimum eilmeyi azalt rken elastikiyet modülünü arttrm, transvers dayan m ise etkilememitir. Sonuç: Geçici kron-köprü materyali seçiminde, elastikiyet modülü ve maksimum eilme bak- mndan bis-akril kompozit PEMA’ya göre daha güvenli kullanlabilir. PEMA materyalinin kullanm durumunda ise materyale % 2 konsantrasyonda cam fiber ilavesi maksimum eilme ve elastikiyet modülü bakmndan önerilebilir.

Investigation of transvers strenght, modulus of elasticity and maximum deflection of fiber reinforced two provisional restorative material

Purpose: This study investigated the effects of different concentrations of glass fiber addition on the transverse strength, modulus of elasticity and maximum flexure of polyethylmethacrylate (PEMA) and bis-acryl composite based provisional crown materials. Materials and Methods: Test specimens (n=10) of 1% and 2% weight fiber concentrations were prepared with either a bis-acryl composite or a PEMA provisional crown material. Bis-acryl composite or PEMA provisional crown specimens without any fiber reinforcement were used as control groups. The transverse strength, maximum flexure and modulus of elasticity was measured with the 3-point bending test.3-point bending test was applied to sixty specimens with a universal testing machine at a crosshead speed of 1 mm/min. One specimen for each group was evaluated in SEM. Statistical analysis was performed with Kruskal-Wallis test and multiple comparisons were done with Siegel-Castellan test. Results: Maximum flexure and modulus of elasticity properties of bis-acryl composite were found significantly better than the PEMA material. However, both of the materials showed same transverse strength values. 1 % and 2 % concentration of glass fiber addition to the bis-aryl composite and 1 % concentration of glass fiber addition to the PEMA did not show significant effect for transverse strength, maximum flexure and modulus of elasticity. While 2 % concentration of glass fiber addition to the PEMA decreasing the maximum flexure, it increased the modulus of elasticity and it did not affect the transverse strength. Conclusion: Bis-acryl composite could be used more safely than PEMA as a provisional crown material in terms of maximum flexure and modulus of elasticity. In the case of using PEMA as a provisional crown material, the addition of 2 % glass fiber could be suggested in terms of maximum flexure and modulus of elasticity.

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