Evaluation of Correlation Between Wear Resistance and Microhardness of Resin Based CAD/CAM Blocks

Abstract

Aim: To examine the relation wear resistance and microhardness of composite block, hybrid block, resin composite to provide convenient argument to clinical usage of materials. Methods: Conventional resin composite (IPS Empress direct, Ivoclar Vivadent), hybrid ceramic block (Enamic, Vita) and composite blocks (Lava Ultimate, 3M), (Hc block, Shofu),  (BrilliantCrios, Coltene), (Cerasmart, GC) were investigated. Specimens (n=12 for each group) (n=12 for each group) were loaded in a chewing simulator together a thermal cycling (49 N force, 240.000 cycles, 1.5 mm lateral movement, 1.7 Hz frequency). Specimens were scanned with a Las-20 (Laserscanner, SD Mechatronic) and Vickers microhardness (VHN) was determined (200 grf, 10 s). Statistical analysis was performed with using spearman correlation coefficient.  Results: A negative correlation determined for all groups (r=- 0.83). Correlation was observed only composite block group between microhardness and wear resistance and no correlation was found hybrid block and resin composite. Conclusion: Correlation has found between surface microhardness and abrasive wear resistance of the IPS Empress direct,Enamic, Brilliant Crios, Hc block, Cerasmart, Lava Ultimate materials.

Keywords

• Cad/Cam Block
• Chewing simulator
• Microhardness
• Resin Composite
• Wear

Kompozit İçerikli Cad/Cam Blokların Aşınma Direnci ile Mikrosertlik Arasındaki Korelasyonun Değerlendirilmesi

Abstract

Amaç: Bu çalışmanın amacı mikrosertlik ve aşınma direnci arasındaki korelasyonun değerlendirilmesidir. Yöntem: Çalışma için 6 farklı materyal olarak konvansiyonel rezin kompozit (IPS Empress direct, Ivoclar Vivadent), hibrit seramik blok (Enamic, Vita), kompozit blok (Lava Ultimate, 3M), (Hc block, Shofu) (BrilliantCrios, Coltene), (Cerasmart, GC), kullanıldı. Örnekler (n=12) termal siklus özelliği olan çiğneme simülatöründe örnekler yaşlandırıldı (49 N kuvvet, 240,000 siklus, 1,5 mm lateral hareket, 1,7 Hz frekans). Lazer tarayıcı kullanılarak aşınan yüzeyler tarandı (Las-20, SD Mechatronic, Almanya) ve Vickers mikrosertlik değeri (VHN) ölçüldü (200 grf, 10s). İstatistiksel analiz spearman korelasyon katsayısı, Kolmogorov-Smirnov, Mann-Whitney U, Friedman ve Kruskal-Wallis testleri kullanılarak yapıldı (önem düzeyi, p<0,05). Bulgular: Veriler değerlendirildiğinde kompozit blok grubu için aşınma direnci ve mikrosertlik arasında korelasyon vardır (r=-0,83) ve hibrit blok ve rezin kompozit grupları için korelasyon yoktur. Bütün materyaller için negatif korelasyon bulunmuştur. Sonuç: IPS Empress direct, Enamic, Brilliant Crios, Hc block, Cerasmart, Lava Ultimate materyalleri için aşınma direnci ve mikrosertlik arasında korelasyon vardır.

Keywords

• Aşınma
• Cad/Cam Blok
• Çiğneme simülatörü
• Mikrosertlik
• Rezin Kompozit

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