TARİHİ GEÇMİŞ KOMPOZİT REZİNLERİ KULLANMAK MÜMKÜN MÜ? : FTIR ANALİZİ
Amaç: Bu çalışmanın amacı; son kullanma tarihleri 1 yıl, 2 yıl ve 3 yıl geçmiş rezin kompozitlerin (RK) dönüşüm derecelerini karşılaştırarak kullanımlarındaki güven aralığını değerlendirmektir. Materyal ve Metod: Üç farklı RK'den (Herculite XRV-Ultra A2-dentin, son kullanma tarihi 3 yıl ve 1 yıl geçmiş; Herculite Classic A2, son kullanma tarihi 2 yıl geçmiş; Kerr) 9 adet disk (8 x2 mm) hazırlandı (n=3). RK silikon kalıplara yerleştirildi, her iki tarafı şeffaf bantlar ile kapatıldı ve LED ışıklı cihaz ile (Valo, Ultradent) ile 20 sn parmak basıncı altında polimerizasyonu takiben numuneler 37°C'de 24 saat distile suda bekletildi. Dönüşüm derecesini (%DC) belirlemek için Fourier Dönüşümü Kızılötesi Spektrometre (FT-IR, JASCO) ile örnekleme kullanılarak polimerize olmuş ve olmamış kompozitler üzerinde spektral analizler yapıldı. Ortaya çıkan FT-IR spektrumu, 20 °C ortam sıcaklığında 4000–400 cm-1 spektral aralığında kaydedildi; kullanılan çözünürlük dört tarama ile 4 cm-1’dir. Veriler SPSS (SPSS Inc.) ile tek yönlü varyans analizi (ANOVA) ve Tukey testleri kullanılarak analiz edildi. Anlamlılık düzeyi p<0,05 olarak alındı. Bulgular: En yüksek ortalama %DC, 1 yıllık son kullanma tarihi geçmiş RK grubu için kaydedilirken (H-6: 68,80 ± 4,544), bunu 2 yıllık son kullanma tarihi geçmiş RK grubu (H- 12: 68,268 ± 2,695) takip etmiştir. En düşük ortalama %DC 3 yıl üstü RK grubu için kaydedilmiştir (H-24: 68.032 ± 4.641). Üç grup arasında %DC değerleri açısından istatistiksel olarak anlamlı bir fark bulunmadı (P=0,096). Sonuç: Bu çalışmanın limitasyonları dahilinde; son kullanma tarihleri üzerinden 1, 2 ve 3 yıl geçmiş kompozitler benzer %DC sonuçları gösterdi. Klinisyenlerin, üreticiler tarafından önerilen son kullanım tarihi talimatlarını takip etmeleri gerekmektedir.
IS IT POSSIBLE TO USE EXPIRED RESIN COMPOSITES: FTIR ANALYSIS
Aim: The aim of this study is to evaluate the confidence interval in the use of resin composites (RC) with expiration dates of 1-year, 2-years and 3-years by comparing the conversion degrees. Material and Methods: 9 discs (8x2 mm) were prepared from three RC (n=3), (Herculite XRV-Ultra A2-dentine; 3-years expired, 1-year expired. Herculite Classic A2, 2-years expired, Kerr). RC were placed in silicone molds, covered with mylar strips on both sides and polymerized with a LED light-curing unit (Valo, Ultradent) under finger pressure for 20s. The polymerized samples were kept in distilled water for 24 hours at 37C. Spectral analyses were performed on uncured and cured composites using sampling with Fourier Transform Infrared (FT-IR, JASCO) to determine the degree of conversion rates (DC%). The resulting FT-IR spectrum was recorded in the spectral range of 4000–400 cm-1 at ambient temperature of 20 °C; the resolution used was 4 cm-1 with four scans. Data were analyzed with SPSS (SPSS Inc.) using one-way Analysis of variance (ANOVA) and Tukey tests. Significance level was set at p<0.05. Results: The highest mean DC% was recorded for the RC group with 1-year expiration date (H-6: 68,80 ± 4,544), followed by the 2-years expired RC group (H- 12: 68,268 ± 2,695). The lowest mean DC% was recorded for the RC group with 3-years of expiration date (H-24: 68,032 ± 4,641). There was no statistically significant difference between the three groups in terms of DC% values (p=0.096). Conclusion: Within the limitations of this study, composites with expiration dates of 1-, 2-, and 3-years showed similar DC% results. Clinicians are required to follow the expiration date guidelines recommended by the manufacturers’.
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