Beyazlatma ajanlarının farklı rezin matriksli seramiklerin mikro sertliğine etkisi

Öz

ÖZET Amaç: Bu çalışmanın amacı, farklı beyazlatma protokollerinin ve konsantrasyonlarının in vitro CAD/CAM materyallerinin mikro sertliği üzerindeki etkisini değerlendirmektir. Yöntemler: Beş adet CAD/CAM bloğu; rezin nanoseramik, esnek nano-hibrit seramik, hibrit seramik, rezin infiltre seramik, güçlendirilmiş kompozit kullanıldı. Her blok ve beyazlatma prosedürü için 1,5 mm kalınlığında yüz örnek hazırlandı (n=10). Bitirme ve cilalama, üreticinin önerileri doğrultusunda uygulandı. Evde beyazlatma grubuna 14 gün boyunca günde 6 saat olmak üzere %16 karbamid peroksit içerikli Opalescence PF beyazlatma jeli uygulanırken, ofiste beyazlatma grubuna 1. ve 7. günlerde seans başına 2 kez 20 dakika boyunca %40 hidrojen peroksit içerikli Opalescence Boost beyazlatma jeli uygulandı. Örneklerin mikro sertliği, işlemden önce ve sonra bir Vickers sertlik cihazı ile ölçüldü. Veriler tekrarlanan ölçümler varyans analizi ve Bonferroni düzeltmesi ile istatistiksel olarak değerlendirildi. Sonuçlar: Beyazlatmadan sonra en yüksek mikro sertlik değerleri rezin infiltre seramikteydi (p<0,05). Hibrit seramiğin mikro sertlik değerleri önemli ölçüde azaldı (p<0,05). Hibrit seramik dışındaki bloklarda ofis içi ve evde yapılan beyazlatma işlemleri arasında önemli bir fark tespit edilmedi. Sonuçlar: Hem ofis içi hem de evde yapılan beyazlatma protokolleri rezin infiltre seramik restorasyonların mikro sertliğini azaltmayacaktır, bu nedenle bu tip CAD/CAM blokları beyazlatma tedavilerinde tercih edilebilir.

Anahtar Kelimeler

• hibrit bloklar
• beyazlatma
• mikro sertlik

Effect of bleaching agents on microhardness of different resin matrix ceramics

Abstract

Aim: The objective of this study is to assess the effect of different bleaching protocols and concentrations on the microhardness of CAD/CAM materials in vitro. Material and Methods: Five contemporary CAD/CAM blocks; resin nanoceramic, flexible nano-hybrid ceramic, hybrid ceramic, resin-infiltrated ceramic, reinforced composite were used. One hundred samples were prepared for every block and bleaching procedure (n=10) with a thickness of 1.5 mm. Finishing and polishing were applied in accordance with the manufacturers' recommendations. Opalescence PF bleaching gel with a 16% carbamide peroxide content was applied to the at-home bleaching group for 14 days for 6 hours a day, whereas Opalescence Boost bleaching gel with a hydrogen peroxide content of 40% was applied to the in-office bleaching group for 20 minutes 2 times per session on days 1 and 7. The microhardness of the samples was measured with a Vickers hardness device before and after processing. The data were statistically evaluated with the repeated-measures analysis of variance and the Bonferroni correction. Results: After bleaching, the highest microhardness values were in the resin-infiltrated ceramic (p<0.05). The microhardness values of hybrid ceramic decreased significantly (p<0.05). No significant difference was detected between in-office and at-home bleaching processes in blocks other than the hybrid ceramic. Conclusions: Bleaching protocols, both in-office and at-home, will not decrease the microhardness of resin-infiltrated ceramic restorations and they may better preserve aesthetic during bleaching, so this type of CAD/CAM blocks may be preferred in cases of bleaching treatments.

Keywords

• hybrid blocks
• bleaching
• microhardness

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