Evaluation of physical and mechanical properties of glass carbomer cement under in vitro conditions

Öz

Aim: To evaluate the microtensile bond strength (μTBS) and microhardness of glass carbomer cement in comparison to conventional glass ionomer cement and compomer.

Material and Methods: The bonding strength test involved 60, second deciduous molar teeth. The dentine bonding strength of the restorative materials was evaluated by a μTBS test. Failure modes were determined by light microscopy. Plexi-glass molds of 5 × 2 mm (diameter × depth) were used for Vickers’ microhardness analysis. Seventy-five samples were evaluated, considering twenty-five samples for each material. The data were statistically analyzed by the Kruskal-Wallis test, at p≤0.05.

Results:There was no significant difference between the μTBS of the glass carbomer (2.0 MPa) and glass ionomer (1.7 MPa) (p>0.05). However, the μTBSof the compomer (9.4 MPa) was higher than the glass carbomer and glass ionomer (p<0.001). No significant difference was found among the three materials, regarding adhesive, cohesive and mixed failure modes (p>0.05). The compomer presented the highest microhardness value, followed by the glass ionomer and finally, the glass carbomer (p<0.001).

Conclusion:The glass carbomer cement showed a lower μTBSto the dentine than the compomer. Furthermore, the microhardness of the carbomer was lower than the compomer and glass ionomer.

Anahtar Kelimeler

• Pediatric dentistry,Glass carbomer cement,Glass ionomer cements.

Cam karbomer simanın fiziksel ve mekanik özelliklerinin in vitro koşullar altında değerlendirilmesi

Öz

Amaç: Bu çalışmanın amacı; cam karbomer simanın mikrogerilim bağlanma dayanımı ve mikrosertlik değerlerinin geleneksel cam iyonomer siman ve kompomerle karşılaştırılarak değerlendirilmesidir.

Gereç ve Yöntemler: Bağlanma dayanımı testinde 60 adet süt 2. molar dişi kullanılmıştır. Bu amaçla dentine uygulanan restoratif materyallerin dentine bağlanma kuvveti ‘mikrogerilim bağlanma dayanımı testi’ iledeğerlendirilmiştir. Kopma tipleri 20X büyütmede ışık mikroskobu altında belirlenmiştir. Mikrosertlik testi için 5 mm çapta ve 2 mm derinlikte pleksi-glass kalıplar kullanılmıştır. Her materyal için 25 örnek olacak şekilde 75 örnek değerlendirilmiştir ve materyal mikrosertlikleri ‘Vicker’s testi’ ile incelenmiştir. Elde edilen veriler Kruskal Wallis testiyle değerlendirilmiştir. İstatistiksel anlamlılık düzeyi p≤0,05 olarak kabul edilmiştir.

Bulgular: Cam karbomer (2,0 MPa) ve cam iyonomerin (1,7 MPa) dentine bağlanma değerleri arasında istatistiksel olarak anlamlı farklılık olmadığı, kompomerin ise (9,4 MPa) istatistiksel olarak anlamlı derecede daha yüksek mikrogerilim bağlanma dayanımı gösterdiği belirlenmiştir (p<0,001). Cam karbomer siman, cam iyonomer siman ve kompomer restorasyon materyalleri arasında adeziv, koheziv ve karışık kopma tipleri oranları açısından istatistiksel olarak anlamlı fark görülmemiştir (p=0,409).

Restoratif materyallerin mikrosertlik değerleri arasında ise istatistiksel anlamlı fark tespit edilmiştir (p<0,001). Mikrosertliği en yüksek dolgu materyali kompomer; mikrosertliği en düşük materyal ise cam karbomer olacak şekilde materyal sertlikleri kompomer>cam iyonomer>cam karbomer olarak belirlenmiştir.

Sonuç: Cam karbomer siman dentine kompomerden daha düşük mikrogerilim bağlanma dayanımı göstermiştir. Ayrıca mikrosertlik değeri kompomerden ve cam iyonomer simandan daha düşük olarak tespit edilmiştir

Anahtar Kelimeler

• Çocuk diş hekimliği; Cam karbomer siman; Kompomer; Cam iyonomer siman.

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