Effect of Yttria Percentage and Different Surface Treatments on the Flexural Strength of Zirconia Materials: An In Vitro Study.

Q3 Dentistry

Journal of Contemporary Dental Practice Pub Date : 2025-02-01 DOI:10.5005/jp-journals-10024-3822

Nagy M Omar, Mohamed F Aldamaty, Tamer E Shokry

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Abstract

Aim: This in vitro study aimed to investigate the effect of yttria and different surface treatments on the biaxial flexural strength of zirconia materials.

Materials and methods: Seventy-two circular-shaped specimens, with a dimension of 13 × 1 mm², were milled from three presintered zirconia (24 each). Based on the surface treatment, the specimens were divided into four subgroups (n = 6): Air-borne particle abrasion (AB); silica coating (SC); sulfuric acid etching (SA); and one group (n = 6) which received no treatment (C). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used. Biaxial flexural strength was measured using a universal testing machine. A two-way analysis of variance (ANOVA) test was utilized to analyze the impact of surface treatment, zirconia type, and their interactions on mean flexural strength, followed by Bonferroni's post-hoc test for pair-wise comparisons when ANOVA results were significant. A significant threshold of p ≤ 0.05 was set.

Results: Yttria multilayered zirconia (YML) demonstrated the greatest average flexural strength, followed by super translucent zirconia (STML) and ultratranslucent zirconia (UTML). The YML with SC has the highest mean flexural strength followed by AB and SA, with no significant difference. While for STML, there was no variation in the flexural strength of surface treatments. The UTML showed that SA has the maximum average flexural strength. Control surface treatment showed the lowest mean flexural strength. The XRD examination revealed the absence of a monoclinic phase in STML or UTML, but it was found with YML.

Conclusion: For YML, silica coating significantly enhanced biaxial flexural strength compared with airborne-particle abrasion and sulfuric acid treatments. The monoclinic phase was detected in YML after surface treatment.

Clinical significance: The selection of zirconia materials and surface treatments should be specialized to optimize mechanical strength while considering the intended clinical application. How to cite this article: Omar NM, Aldamaty MF, Shokry TE. Effect of Yttria Percentage and Different Surface Treatments on the Flexural Strength of Zirconia Materials: An In Vitro Study. J Contemp Dent Pract 2025;26(2):184-191.

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氧化钇含量及不同表面处理对氧化锆材料抗弯强度影响的体外研究

目的：研究氧化钇及不同表面处理对氧化锆材料双轴抗折强度的影响。材料与方法：将3块预压氧化锆（每块24块）磨成72个圆形试样，尺寸为13 × 1 mm2。根据表面处理的不同，将试样分为4个亚组（n = 6）：空气颗粒磨损组（AB）；硅涂层（SC）；硫酸蚀刻；一组（n = 6）未接受治疗(C)。采用扫描电子显微镜（SEM）和x射线衍射仪（XRD）进行分析。双轴抗折强度采用万能试验机测量。采用双向方差分析（ANOVA）检验分析表面处理、氧化锆类型及其相互作用对平均抗弯强度的影响，当ANOVA结果显著时，采用Bonferroni事后检验进行两两比较。p≤0.05为显著阈值。结果：氧化钇多层氧化锆（YML）的平均抗弯强度最大，其次是超透明氧化锆（STML）和超透明氧化锆（UTML）。含SC的YML的平均抗弯强度最高，其次是AB和SA，但差异不显著。而对于STML，表面处理的抗弯强度没有变化。html显示SA具有最大的平均抗弯强度。对照表面处理的平均抗弯强度最低。XRD检查显示STML和UTML中没有单斜相，而YML中有单斜相。结论：与空气颗粒磨损和硫酸处理相比，二氧化硅涂层可显著提高YML的双轴抗折强度。表面处理后的YML中检测到单斜相。临床意义：氧化锆材料的选择和表面处理在考虑临床用途的同时，要有针对性地优化机械强度。如何引用本文：Omar NM， Aldamaty MF, Shokry TE。氧化钇含量及不同表面处理对氧化锆材料抗弯强度影响的体外研究现代医疗实践[J]; 2015;26(2):184-191。

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来源期刊

Journal of Contemporary Dental Practice Dentistry-Dentistry (all)

CiteScore

1.80

自引率

0.00%

发文量

174

期刊介绍： The Journal of Contemporary Dental Practice (JCDP), is a peer-reviewed, open access MEDLINE indexed journal. The journal’s full text is available online at http://www.thejcdp.com. The journal allows free access (open access) to its contents. Articles with clinical relevance will be given preference for publication. The Journal publishes original research papers, review articles, rare and novel case reports, and clinical techniques. Manuscripts are invited from all specialties of dentistry i.e., conservative dentistry and endodontics, dentofacial orthopedics and orthodontics, oral medicine and radiology, oral pathology, oral surgery, orodental diseases, pediatric dentistry, implantology, periodontics, clinical aspects of public health dentistry, and prosthodontics.