Effect of thermomechanical aging on the surface roughness and color stability of novel CAD-CAM materials: An in-vitro study

IF 0.3 Q4 MEDICINE, RESEARCH & EXPERIMENTAL Clinical and Experimental Health Sciences Pub Date : 2022-11-03 DOI:10.33808/clinexphealthsci.1112365

A. D. DİKEN TÜRKSAYAR, Mustafa Borga Dönmez, Duygu Hisarbeyli, Özlem SEÇKİN KELTEN

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Abstract

Objective:. This in-vitro study aimed to evaluate the surface roughness (Ra) and color stability of novel monolithic CAD-CAM materials after thermomechanical aging. Methods: Forty specimens were obtained from 4 different materials (a resilient ceramic (C), ceramic-reinforced PEEK (BH), lithium disilicate glass ceramic (EX), and a resin based composites (B) (n=10). Initial Ra and color coordinates were recorded. All specimens were than subjected to thermomechanical aging. Ra and color coordinate measurements were repeated. CIEDE2000 formula was used to calculate the color changes (ΔE00). Kruskal-Wallis and Dunn tests were used to analyze data, while the effect of aging on Ra was analyzed with Wilcoxon test (α=.05). Results: Regardless of aging, BH showed higher Ra than EX (P.05). Ra of ceramic-reinforced PEEK was above clinical threshold, regardless of thermomechanical aging. Conclusion: Thermomechanical aging caused a color change that was perceptible for all the materials tested, while it was also unacceptable for ceramic-reinforced PEEK.

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热机械老化对新型CAD-CAM材料表面粗糙度和颜色稳定性影响的体外研究

目的:。本体外研究旨在评估新型整体CAD-CAM材料在热机械老化后的表面粗糙度(Ra)和颜色稳定性。方法:从4种不同材料(弹性陶瓷(C)、陶瓷增强PEEK (BH)、二硅酸锂玻璃陶瓷(EX)和树脂基复合材料(B))中获得40个样品(n=10)。记录初始Ra和颜色坐标。所有试样均进行了热机械时效处理。重复测量Ra和颜色坐标。使用CIEDE2000公式计算颜色变化(ΔE00)。采用Kruskal-Wallis检验和Dunn检验分析数据，采用Wilcoxon检验分析衰老对Ra的影响(α= 0.05)。结果:不论年龄大小，BH的Ra均高于EX (p < 0.05)。无论热机械老化与否，陶瓷增强PEEK的Ra均高于临床阈值。结论:热机械老化引起的颜色变化是可察觉的所有材料的测试，而陶瓷增强PEEK也是不可接受的。

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Clinical and Experimental Health Sciences MEDICINE, RESEARCH & EXPERIMENTAL-

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