{"title":"Influence of Layer and Sintering Temperature on the Optical Properties of Multilayered Zirconia Materials.","authors":"B A Alfahed, A S Alayad","doi":"10.1922/EJPRD_2508Alfahed12","DOIUrl":null,"url":null,"abstract":"<p><strong>Objective: </strong>To evaluate the translucency and color difference of the individual layers of two multi-layered zirconia materials at different sintering temperatures and to compare them with lithium disilicate.</p><p><strong>Methods: </strong>Multi-layered zirconia systems with four distinct layers were selected for this study: DD cube ONE ML (4Y-TZP), DD cubeX2 ML (5Y-TZP); and compared with IPS e.max CAD HT (LS2). Plate-shaped A2-shade specimens were obtained from LS2 and individual layers of both zirconia materials. Individual layers were then divided equally into three different sintering temperatures:1300°C, 1450°C, and 1600°C. The TP and ΔE were determined by a spectrophotometer. SEM images were taken. Data was analyzed using SPSS 24.0 software with a p-value ⟨0.05.</p><p><strong>Results: </strong>A significant difference was found in TP and ΔE values amongst all types of ceramic materials. Different sintering temperatures yielded distinct TP and ΔE values when both zirconia materials were tested and compared with LS2. Finally, TP and ΔE values were different amongst the zirconia layers.</p><p><strong>Conclusion: </strong>Sintering temperature, type of ceramic material and different zirconia layers significantly affected the optical properties.</p><p><strong>Clinical significance: </strong>Multi-layered zirconia materials possess a unique gradient effect that could efficiently enhance the esthetics of monolithic zirconia restorations. However, the sintering condition should be optimized.</p>","PeriodicalId":45686,"journal":{"name":"European Journal of Prosthodontics and Restorative Dentistry","volume":null,"pages":null},"PeriodicalIF":1.1000,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"European Journal of Prosthodontics and Restorative Dentistry","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1922/EJPRD_2508Alfahed12","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
引用次数: 0
Abstract
Objective: To evaluate the translucency and color difference of the individual layers of two multi-layered zirconia materials at different sintering temperatures and to compare them with lithium disilicate.
Methods: Multi-layered zirconia systems with four distinct layers were selected for this study: DD cube ONE ML (4Y-TZP), DD cubeX2 ML (5Y-TZP); and compared with IPS e.max CAD HT (LS2). Plate-shaped A2-shade specimens were obtained from LS2 and individual layers of both zirconia materials. Individual layers were then divided equally into three different sintering temperatures:1300°C, 1450°C, and 1600°C. The TP and ΔE were determined by a spectrophotometer. SEM images were taken. Data was analyzed using SPSS 24.0 software with a p-value ⟨0.05.
Results: A significant difference was found in TP and ΔE values amongst all types of ceramic materials. Different sintering temperatures yielded distinct TP and ΔE values when both zirconia materials were tested and compared with LS2. Finally, TP and ΔE values were different amongst the zirconia layers.
Conclusion: Sintering temperature, type of ceramic material and different zirconia layers significantly affected the optical properties.
Clinical significance: Multi-layered zirconia materials possess a unique gradient effect that could efficiently enhance the esthetics of monolithic zirconia restorations. However, the sintering condition should be optimized.
目的:评价两种多层氧化锆材料在不同烧结温度下各层的透光性和色差，并与二硅酸锂进行比较。方法:采用四层氧化锆体系:DD cube ONE ML (4Y-TZP)、DD cube x2 ML (5Y-TZP);并与IPS e.max CAD HT (LS2)进行比较。从两种氧化锆材料的LS2和单个层中获得了片状a2阴影样品。然后将单个层平均分为三种不同的烧结温度:1300°C, 1450°C和1600°C。用分光光度计测定TP和ΔE。拍摄扫描电镜图像。数据分析采用SPSS 24.0软件，p值为⟨0.05。结果:不同类型陶瓷材料的TP值和ΔE值有显著差异。对两种氧化锆材料进行了测试，并与LS2进行了比较，结果表明不同的烧结温度产生了不同的TP值和ΔE值。最后，不同氧化锆层间的TP值和ΔE值存在差异。结论:烧结温度、陶瓷材料类型和氧化锆层数对光学性能有显著影响。临床意义:多层氧化锆材料具有独特的梯度效应，可有效提高整体氧化锆修复体的美观性。但烧结条件仍需优化。
期刊介绍：
The European Journal of Prosthodontics and Restorative Dentistry is published quarterly and includes clinical and research articles in subjects such as prosthodontics, operative dentistry, implantology, endodontics, periodontics and dental materials.
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