Strength of a Zirconia- Reinforced Glass-Ceramic After Diamond Bur Adjustment.

IF 1.1 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

European Journal of Prosthodontics and Restorative Dentistry Pub Date : 2023-11-30 DOI:10.1922/EJPRD_2468MouraPereira09

B Moura Pereira, A Restani Oliveira, R Leal do Prado, A B Gomes de Carvalho, R Marques de Melo, K Singh Jodha, S M Salazar Marocho, G Ávila Galhano

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引用次数: 0

Abstract

Introduction: Adjustments with diamond burs on the ceramic surface can affect its roughness and decrease flexural strength. This study evaluated the effect of polishing or glazing on the surface roughness and biaxial flexural strength of a zirconia-reinforced lithium silicate glass-ceramic upon adjustment with diamond burs.

Methods: Seventy disks were prepared according to ISO 6872 and divided into seven groups (n = 10) according to different adjustments and finishing processes. Surface roughness was measured prior to biaxial flexural strength testing. The topography was analyzed using an atomic force microscope , fracture markings were identified using a stereomicroscope and representative specimens were analyzed using scanning electron microscopy.

Results: The use of diamond burs significantly increased the surface roughness and decreased the strength of the evaluated ceramic (p⟨0.05). Polishing reduced the ceramic's roughness but resulted in flexural strength similar to that of the groups with wear (p⟩0.05). The glaze-treated specimens showed flexural strength statistically similar to the control group (p>0.05) but higher roughness, similar to those with wear.

Conclusions: Polishing reduced the surface roughness but did not affect the biaxial flexural strength of the ZLS ceramic. At the same time, the application of glaze after wear increased the strength.

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一种氧化锆增强玻璃陶瓷在金刚石钎剂调整后的强度。

导读:金刚石毛刺在陶瓷表面的调整会影响其粗糙度并降低其弯曲强度。本研究评估了抛光或上釉对氧化锆增强硅酸锂玻璃陶瓷表面粗糙度和双轴抗折强度的影响。方法:按ISO 6872标准制备光盘70张，按调整和整理工艺不同分为7组(n = 10)。在双轴弯曲强度测试之前测量表面粗糙度。用原子力显微镜分析形貌，用体视显微镜识别断口痕迹，用扫描电镜分析代表性试样。结果:金刚石毛刺的使用显著增加了表面粗糙度并降低了评估陶瓷的强度(p⟨0.05)。抛光降低了陶瓷的粗糙度，但导致弯曲强度与磨损组相似(p⟩0.05)。釉面处理试样的抗弯强度与对照组相似(p>0.05)，但粗糙度较高，与磨损试样相似。结论:抛光降低了ZLS陶瓷的表面粗糙度，但不影响其双轴抗折强度。同时，磨耗后的釉料的应用提高了强度。

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

European Journal of Prosthodontics and Restorative Dentistry DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

2.30

自引率

7.70%

发文量

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.