Effect of thermomechanical loading on fracture resistance and failure mode of new pressable zirconia-reinforced lithium disilicate onlay restoration.

Q4 Dentistry Journal of Dental Research, Dental Clinics, Dental Prospects Pub Date : 2024-01-01 Epub Date: 2024-03-29 DOI:10.34172/joddd.40843

Walid A Abdelhady, Mohamed F Metwally, Khaled M Haggag

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Abstract

Background: Insufficient information exists regarding the fracture resistance and failure pattern of newly developed zirconia-reinforced lithium disilicate (ZL, Vita Ambria) onlays. This in vitro study compared the fracture resistance of two types of onlays: monolithic lithium disilicate (LD) and monolithic ZL.

Methods: Forty-eight ceramic onlay restorations were fabricated on epoxy dies using a maxillary first premolar model. The samples were divided into two main groups: LD and ZL. Half of each group was subjected to thermomechanical fatigue loading (TML) using a chewing simulator. All the samples were cemented with self-adhesive resin cement. Subsequently, they were loaded until failure in a universal testing machine, and the fracture patterns and resistance were recorded.

Results: Before TML, ZL demonstrated the highest statistically significant mean fracture resistance (499.76±34.14N) compared to LD (470.40±27.38N). After TML, ZL showed the highest non-statistically significant mean fracture resistance (429.27±131.42N), while LD's mean fracture resistance decreased (377.31±62.18N).

Conclusion: Monolithic zirconia-reinforced onlays demonstrated higher fracture resistance and a more favorable failure mode compared to LD. However, the impact of thermomechanical aging resulted in reduced fracture resistance for both materials, with a notable preference observed for ZL.

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热机械加载对新型可压氧化锆强化二硅酸锂嵌体修复体抗断裂性和破坏模式的影响

背景：关于新开发的氧化锆增强二硅酸锂（ZL，Vita Ambria）嵌体的抗断裂性和失效模式的信息不足。这项体外研究比较了两种嵌体的抗断裂性：单质二硅酸锂（LD）和单质 ZL：方法：使用上颌第一前磨牙模型，在环氧树脂模具上制作了 48 个陶瓷嵌体修复体。样品主要分为两组：LD 和 ZL。每组一半的样品使用咀嚼模拟器进行热机械疲劳加载（TML）。所有样品都用自粘性树脂粘接剂粘接。随后，在万能试验机上加载直至失效，并记录断裂模式和阻力：在 TML 之前，ZL 的平均断裂抗力（499.76±34.14N）与 LD（470.40±27.38N）相比具有最高的统计学意义。在 TML 之后，ZL 显示出最高的无统计学意义的平均断裂抗力（429.27±131.42N），而 LD 的平均断裂抗力则有所下降（377.31±62.18N）：结论：与LD相比，单片氧化锆增强镶嵌体表现出更高的抗断裂性和更有利的失效模式。然而，热机械老化的影响导致两种材料的抗断裂性都降低了，而 ZL 的抗断裂性更佳。

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来源期刊

Journal of Dental Research, Dental Clinics, Dental Prospects Dentistry-General Dentistry

CiteScore

1.40

自引率

0.00%

发文量

审稿时长

25 weeks

期刊介绍： Journal of Dental Research Dental Clinics Dental Prospects (JODDD) is a Platinum* Open Access, peer-reviewed quarterly indexed journal that publishes articles of basic, clinical, and prospective nature in all areas of dentistry and oral health.