Purpose: The aim of the present study was to evaluate the mechanical properties including surface hardness, flexural strength, and flexural modulus of two dual-cured resin luting agents (New Resin Cement [NRC] and Variolink II [VLII]) irradiated through four different thickness of leucite ceramics (0, 1, 2, and 3 mm) and their shear bond strength to zirconia ceramic (Cercon) using each ceramic primer. Materials and Methods: Knoop hardness was measured on a thin layer of resin luting agent on the ceramic surface. Three-point bending tests were performed after 24 h storage at 37°C. Two different-shaped zirconia ceramic specimens with or without sandblasting with alumina were treated with each primer. The specimens were then cemented together with each resin luting agent. Half of the specimens were stored in water at 37°C for 24 h and the other half were thermocycled 5,000 times. Results: VLII revealed statistically higher Knoop hardness and flexural modulus than NRC for each thickness of ceramic. No significant differences in flexural strength were observed between VLII and NRC for each ceramic spacer. Reduction of the mechanical properties with increase of ceramic thickness varied for each property. However, these properties were similar between the two materials. Blasting with alumina was significantly effective for increasing shear bond strength of both resin luting agents before and after thermal cycling. The use of New Ceramic Primer showed the highest shear bond strength and maintained bond durability after 5,000 thermocycles. Conclusion: Mechanical properties of NRC dual-cured resin luting agent appear adequate for ceramic restorations.
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机译:目的:本研究的目的是评估通过两种不同方式照射的两种双固化树脂浸润剂(新树脂水泥[NRC]和Variolink II [VLII])的机械性能,包括表面硬度,弯曲强度和弯曲模量。每种陶瓷底漆的厚度(0、1、2和3 mm)以及它们对氧化锆陶瓷(Cercon)的剪切粘结强度。材料和方法:努氏硬度是在陶瓷表面的薄薄一层树脂浸润剂上测量的。在37°C下储存24小时后,进行了三点弯曲测试。每种底漆均处理了两个不同形状的氧化锆陶瓷样品,有或没有用氧化铝喷砂处理。然后将样品与每种树脂浸润剂粘合在一起。将一半样本在37°C的水中保存24小时,另一半进行5,000次热循环。结果:对于每种厚度的陶瓷,VLII显示出比NRC更高的努氏硬度和挠曲模量在统计学上更高。对于每种陶瓷垫片,在VLII和NRC之间未观察到弯曲强度的显着差异。随着陶瓷厚度的增加,机械性能的降低因每种性能而异。但是,两种材料的这些特性相似。用氧化铝喷砂对于提高热循环前后两种树脂浸润剂的剪切粘结强度都非常有效。新陶瓷底漆的使用显示出最高的剪切粘合强度,并在5,000个热循环后保持了粘合耐久性。结论:NRC双固化树脂浸润剂的机械性能似乎足以用于陶瓷修复体。
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