ÖZET
Amaç:
Bu çalışmanın amacı, iki ve üç yıllık son kullanma tarihi geçmiş dental kompozitlerin (Filtek Ultimate Universal) tarihi geçmemiş kompozitlere göre mikrosertliği, dönüşüm oranı ve su emilimi/çözünürlüğünü karşılaştırmaktır.
Yöntemler:
Hazırlanan örneklerin (çap =8 mm; kalınlık =2 mm) alt ve üst yüzeylerine Vickers sertlik testi uygulandı ve alt/üst sertlik oranına göre dönüşüm oranı hesaplandı. Ayrıca, 1, 7 ve 28 gün distile su içinde bekletildikten sonra su emilimi ve çözünürlüğü ölçüldü. İstatistiksel analiz için Shapiro-Wilk testi, tek yönlü varyans analizi, Kruskal-Wallis, tekrarlayan varyans analizi ve Friedman testi kullanıldı (p<0,05).
Bulgular:
Mikrosertlik, dönüşüm oranı veya suda çözünürlük açısından gruplar arasında anlamlı fark bulunamadı. Fakat, son kullanma tarihi geçmemiş dental kompozitlerin üç yıllık dental kompozitlere göre 28. gündeki suda emilimi daha yüksekti. Ayrıca, tüm son kullanma tarihi geçmiş ve geçmemiş materyallerin su emilimi/çözünürlükleri 1 ve 28. gün arasında zamanla değişti.
Sonuç:
Son kullanma tarihi iki ve üç yıl geçmiş ve geçmemiş dental kompozitler mikrosertlik, dönüşüm oranı ve suda çözünürlük açısından benzer karakteristikler sergiledi. Fakat, dental kompozitlerin degredasyonu karmaşık bir süreçtir ve diş hekimlerine son kullanma tarihlerine uymaları tavsiye edilir.
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