POLYMERIZATION EFFICIENCY OF TWO DUAL-CURE CEMENTS THROUGH DENTAL CERAMICS

Year 2015, Volume: 49 Issue: 1, 10 - 18, 12.03.2015

Volkan Turp , Değer Öngül , Pınar Gültekin Özgür Bultan Burçin Karataşlı Elif Pak Tunç

https://doi.org/10.17096/jiufd.25575

Abstract

Purpose: The aim of this study was to evaluate the effect of thickness of zirconia on curing efficiency of resin cements.

Materials and Methods: 4 discs with 4.0 mm in diameter were prepared from non-HIP translucent zirconia blocks using a CAD/CAM system and feldspathic ceramic was layered onto discs. Thus, 4 ceramic disc samples were fabricated: (G) 0.5 mm zirconia- as a control group, (G1) 0.5 mm zirconia and 0.5 mm feldspathic, (G2) 1.0 mm zirconia and 0.5 mm feldspathic and (G3) 2.0 mm zirconia and 0.5 mm feldspathic ceramic layer. 2 different dual cure cements were polymerized using a LED curing unit. Degree of conversion was evaluated using Vickers Hardness Test and depths of cure of samples were measured. Data were analyzed statistically using One-way ANOVA and Tukey’s HSD test (p<0.05).

Results: Microhardness and depth of cure values were different under same thickness of ceramic discs for two resin cements. As the thickness of the zirconia discs increased, the microhardness values and depth of cure decreased.

Conclusion: Photocuring time cannot be the same for all clinical conditions, under thicker zirconia restorations (>2.0 mm), an extended period of light curing or a light unit with a high irradiance should be used.

Keywords

Ceramic thickness; polymerization; resin cement; zirconia

İki Dual-Cure Reçine Simanın Zirkonya Seramikleri Altında Polimerizasyon Etkinliğinin İncelenmesi

Abstract

Amaç: Bu çalışmanın amacı zirkonya kalınlığının
reçine simanın polimerizasyonu üzerine etkisinin
değerlendirilmesidir.
Gereç ve Yöntem: 4.0 mm çapında 4 adet disk non-HIP
zirkonya bloklardan CAD/CAM sistemi kullanılarak
hazırlandı ve feldspatik seramik diskler üzerine tabakalama
tekniği ile uygulandı. Bu şekilde 4 adet seramik disk deney
örneği elde edildi: (G) 0.5 mm zirkonya kontrol grubu, (G1)
0,5 mm zirkonya ve 0,5 mm feldspatik, (G2) 1.0 mm zirkonya
ve 0.5 mm feldspatik ve (G3) 2.0 mm zirkonya ve 0.5 mm
feldspatik seramik katmanı. LED ışık cihazı kullanılarak 2
farklı dual cure reçine siman polimerize edildi. Dönüşüm
derecesi Vickers sertlik değeri kullanılarak değerlendirildi
ve örneklerin polimerizasyon derinliği ölçüldü. Verilerin
istatistiksel değerlendirilmesi tek yönlü varyans analizi
(ANOVA) ve Tukey’s HSD testleri ile yapıldı (p < 0.05).
Bulgular: Mikrosertlik ve polimerizasyon derinliği, aynı
kalınlıktaki seramik örnekler altında iki farklı reçine
siman için anlamlı farklılık göstermiştir. Zirkonya kalınlığı
arttıkça, mikrosertlik değerleri ve polimerizasyon derinliği
azalmıştır.
Sonuç: Işıkla polimerizasyon süresi farklı klinik durumlar
için aynı olamaz. Kalın zirkonya restorasyonlar altında
( > 2.0 mm) ışıkla polimerizasyonun süresini uzatmak veya
yüksek enerjiye sahip bir ışık ünitesi kullanmak uygun
olabilir.

Keywords

seramik kalınlığı, polimerizasyon, reçine siman, zirkonya

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