Effect of Extended Polymerızation Tımes on the Degree of Conversion and Microhardness of Resin Composites

Year 2025, Volume: 26 Issue: 2, 164 - 169, 23.06.2025

Tugce Erdem , Sezer Demirbuğa , Hacer Balkaya

https://doi.org/10.69601/meandrosmdj.1571457

Abstract

Objective: The aim of this study was to evaluate the polymerization properties of bulk-fill and conventional resin composites in terms of the degree of conversion (DC) and microhardness (MH) at different polymerization times.
Materials and Methods: In this study three different polymerization times (20 s, 60 s, and 100 s) were applied to disc shaped samples (6 mm wide; and 2 mm high) prepared from two bulk-fill resin composites (Filtek One Bulk Fill Restorative, X-tra Fil) and two traditional resin composites (Filtek Z550, Charisma Smart). The DC of the polymerized samples was measured with a FT-IR/ATR device, and the MH values were measured with a Vickers hardness device. The collected data were subjected to statistical analysis.
Results: The results of the FT-IR analysis and Vickers microhardness test demonstrated that the DC and MH values of the groups exposed to 100 s of light curing were significantly higher than those of the other groups (p<0.05).
Conclusions: Prolonged polymerization time applied to the resin composites in this study led to an increase in both the DC and MH of the materials.

Keywords

Bulk-fill , Degree of conversion , Microhardness , Resin composite

Ethical Statement

As this study does not involve any human or animal subjects, ethical approval is not required.

Supporting Institution

Erciyes University Scientific Research Projects Unit

Farklı Polimerizasyon Sürelerinin Rezin Kompozitlerin Mikrosertlik ve Dönüşüm Derecesi Üzerine Etkisi

Abstract

Amaç: Bu çalışmanın amacı, farklı polimerizasyon sürelerinde bulk-fill ve konvansiyonel rezin kompozitlerin polimerizasyon özelliklerinin monomer dönüşüm derecesi (DC) ve mikrosertlik (MH) açısından değerlendirilmesidir.
Materyal ve metod: Bu çalışmada, iki bulk-fill rezin kompozit (Filtek One Bulk Fill Restorative, X-tra Fil) ve iki geleneksel rezin kompozitten (Filtek Z550, Charisma Smart) hazırlanan disk şeklindeki örneklere (6 mm genişliğinde ve 2 mm yüksekliğinde) üç farklı polimerizasyon süresi (20 sn, 60 sn ve 100 sn) uygulandı. Polimerize edilen numunelerin DC'si bir FT-IR/ATR cihazı ile, MH değerleri ise bir Vickers sertlik cihazı ile ölçüldü. Elde edilen veriler istatistiksel yöntemlerle analiz edildi.
Bulgular: FT-IR analizi ve Vickers mikrosertlik testi sonuçlarına göre 100 saniye ışık uygulanan grupların DC ve MH değerlerinin diğer gruplara göre anlamlı derecede büyük olduğu ortaya çıkmıştır (p<0,05).
Sonuç: Çalışmada kullanılan rezin kompozitlere uygulanan polimerizasyon süresinin artırılması, rezin kompozitlerin hem DC hem de MH değerlerini artırdığı görüldü.

Keywords

Bulk-fill kompozit , Monomer dönüşüm derecesi , Mikrosertlik , Rezin kompozit

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