Effect of high-speed sintering on the flexural strength of hydrothermal and thermo-mechanically aged zirconia materials.,Dental Materials

当前位置： X-MOL 学术 › Dent. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Effect of high-speed sintering on the flexural strength of hydrothermal and thermo-mechanically aged zirconia materials.
Dental Materials ( IF 4.6 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.dental.2020.05.013
Eva Jerman ₁ , Felicitas Wiedenmann ₁ , Marlis Eichberger ₁ , Axel Reichert ₂ , Bogna Stawarczyk ₁

Affiliation

Objective

To investigate the influence of high-speed and conventional sintering on the flexural strength (FS) of three zirconia materials initial and after artificial aging.

Methods

Milled zirconia specimens (3Y-TZP: ZI and Zolid; 4Y-TZP: Zolid HT+; Amann Girrbach AG; N = 288, n = 96/group) were sintered in a high-speed sintering protocol (final temperature 1580 °C, n = 48/subgroup) or a conventional sintering protocol (control group, final temperature 1450 °C, n = 48/subgroup). FS was tested initially and after artificial aging (10 h in an autoclave or 1,200,000 chewing cycles; n = 16/subgroup). Univariate ANOVAs, post-hoc Scheffé, partial eta-squared, Kolmogorov–Smirnov-, Kruskal–Wallis- and Mann–Whitney-U-test were performed (p < 0.05).

Results

ZI showed the highest and HT+ the lowest FS, regardless of the sintering protocols and aging regimens (p < 0.001). High-speed sintered HT+ showed higher initial FS than the control group (p < 0.001). ZI (p < 0.001–0.004) and Zolid (p < 0.001–0.007) showed higher FS after thermo-mechanical aging. High-speed sintered HT+ showed higher FS in the initial stage (p < 0.001). The Weibull modulus of the three thermo-mechanically aged materials was negatively influenced by high-speed sintering.

Significance

As shorter sintering times represent a cost and time efficient alternative, high-speed sintering is a valid alternative to conventional sintering protocols.

中文翻译：

高速烧结对热液和热机械老化氧化锆材料抗弯强度的影响。

目的

研究高速和常规烧结对三种氧化锆材料初始和人工时效后抗弯强度（FS）的影响。

方法

研磨后的氧化锆样品（3Y-TZP：ZI和Zolid; 4Y-TZP：Zolid HT +; Amann Girrbach AG; N = 288，n = 96 /组）以高速烧结方案进行烧结（最终温度1580°C，n = 48 /子组）或常规烧结方案（对照组，最终温度1450°C，n = 48 /子组）。最初对FS进行了测试，然后进行了人工老化（在高压灭菌器中放置了10 h或1,200,000次咀嚼； n = 16 /子组）。进行了单变量方差分析，事后谢菲（Scheffé），部分方程式平方，Kolmogorov-Smirnov-，Kruskal-Wallis-和Mann-Whitney-U检验（p <0.05）。

结果

无论烧结方案和时效方案如何，ZI均显示出最高的FS和HT +的最低FS（p <0.001）。高速烧结HT +的初始FS高于对照组（p <0.001）。热机械老化后，ZI（p <0.001–0.004）和Zolid（p <0.001–0.007）显示出较高的FS。高速烧结的HT +在初始阶段显示出较高的FS（p <0.001）。三种热机械时效材料的威布尔模量受到高速烧结的不利影响。