Comparison of load bearing capacity of ceramic crowns with zirconia or polyetherketoneketone frameworks.

IF 1.8 4区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE

International Journal of Computerized Dentistry Pub Date : 2023-09-26 DOI:10.3290/j.ijcd.b3774269

Özge Seckin, Ceyda Akin, Mutlu Özcan

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引用次数: 0

Abstract

Aim: The aim of the present study was to compare the load bearing capacity of monolithic or bilayered single crowns with zirconia or polyetherketoneketone frameworks designed and fabricated using CAD/CAM systems.

Materials and methods: Cr-Co-based metal dies (n = 60) were duplicated from an extracted and prepared premolar and then restored with different CAD/CAM materials. The specimens were divided into five groups (n = 12) according to the type of materials: group S: monolithic zirconia-reinforced lithium disilicate; group ZI: bilayered zirconia framework with lithium disilicate; group ZE: bilayered zirconia framework with resin-infiltrated hybrid ceramic; group PI: bilayered polyetherketoneketone (PEKK) framework with lithium disilicate; group PE: bilayered PEKK framework with resin-infiltrated hybrid ceramic. The crown specimens were cemented on Cr-Co metal dies with a resin cement (Multilink N). The specimens were subjected to cyclic mechanical loading followed by load bearing testing. Data were analyzed using the Kruskal-Wallis and Mann-Whitney U tests (α = 0.05).

Results: The monolithic crowns in group S (1930 ± 452.18 N) presented significantly higher load bearing capacity than those of the other groups (P < 0.05). This was followed by group ZI (1165.41 ± 264.04 N). The remaining groups demonstrated comparable results. Failure types were more frequent in all zirconia specimens that included veneering ceramic.

Conclusions: Monolithic zirconia-reinforced lithium disilicate CAD/CAM ceramics showed superior load bearing capacity compared with all other bilayered counterparts. All CAD/CAM materials tested remarkably exceeded the average occlusal force in the posterior region.

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陶瓷冠与氧化锆或聚醚酮框架的承载能力比较。

目的：本研究的目的是比较使用CAD/CAM系统设计和制造的单片或双层单冠与氧化锆或聚醚酮框架的承载能力。材料和方法：从提取和制备的前臼齿上复制Cr-Co基金属模具（n=60），然后用不同的CAD/CAM材料进行修复。根据材料类型将试样分为五组（n=12）：S组：整体氧化锆增强二硅酸锂；ZI组：具有二硅酸锂的双层氧化锆框架；ZE组：树脂渗透混合陶瓷双层氧化锆骨架；PI组：二硅酸锂双层聚醚酮（PEKK）骨架；PE组：具有树脂渗透混合陶瓷的双层PEKK框架。将牙冠试样用树脂水泥（Multilink N）粘合在Cr-Co金属模具上。对试样进行循环机械加载，然后进行承载试验。使用Kruskal-Wallis和Mann-Whitney U检验（α=0.05）对数据进行分析。结果：S组（1930±452.18 N）整体冠的承载力显著高于其他组（P<0.05）。其次是ZI组（1165.41±264.04 N）。其余各组的结果相当。在包括贴面陶瓷在内的所有氧化锆试样中，失效类型更为常见。结论：与所有其他双层陶瓷相比，整体氧化锆增强二硅酸锂CAD/CAM陶瓷显示出优异的承载能力。所有测试的CAD/CAM材料都显著超过了后部区域的平均咬合力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Computerized Dentistry Dentistry-Dentistry (miscellaneous)

CiteScore

2.90

自引率

0.00%

发文量

期刊介绍： This journal explores the myriad innovations in the emerging field of computerized dentistry and how to integrate them into clinical practice. The bulk of the journal is devoted to the science of computer-assisted dentistry, with research articles and clinical reports on all aspects of computer-based diagnostic and therapeutic applications, with special emphasis placed on CAD/CAM and image-processing systems. Articles also address the use of computer-based communication to support patient care, assess the quality of care, and enhance clinical decision making. The journal is presented in a bilingual format, with each issue offering three types of articles: science-based, application-based, and national society reports.