Shahbazi Armaghan, Vafaei Fariborz, Hooshyarfard Amirarsalan, Nosrati Erfan, Nazari Masood, Farhadian Maryam
Department of Prosthodontics, Faculty of Dentistry, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
Dental Implants Research Center, Department of Prosthodontics, Faculty of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
Front Dent. 2022 Sep 12;19:31. doi: 10.18502/fid.v19i31.10803. eCollection 2022.
Any change in the sintering process can directly affect the micro-structure and properties of zirconia. This study sought to assess the effect of sintering temperature on flexural strength of IPS e.max ZirCAD MO Ivoclar (EZI) and CopraSmile White Peaks Symphony (WPS) zirconia blocks. In this in vitro, experimental study, 30 EZI and 30 WPS zirconia blocks measuring 10 x 10 x 1 mm were milled and sintered at 1440, 1500 and 1530°C in three subgroups. The flexural strength of the specimens was measured by a testing machine with piston-on-3-ball method according to ISO2015. Data were analyzed using one-way ANOVA. The mean flexural strength was 1.31±0.49, 1.09±0.24 and 1.29±0.48 MPa in 1440, 1500, and 1530°C subgroups of EZI, and 1.44±0.61, 1.18±0.35, and 1.33±0.54 MPa in 1440, 1500, and 1530°C subgroups of WPS zirconia, respectively. Two-way ANOVA revealed that the effects of zirconia type (P=0.484), temperature (P=0.258) and their interaction (P=0.957) on flexural strength were not significant. Increasing the sintering temperature from 1440°C to 1530°C did not increase the flexural strength of EZI or WPS zirconia.
烧结过程中的任何变化都会直接影响氧化锆的微观结构和性能。本研究旨在评估烧结温度对义获嘉E.max ZirCAD MO（EZI）和科帕拉微笑白峰交响曲（WPS）氧化锆块体抗弯强度的影响。在这项体外实验研究中，将30个尺寸为10×10×1毫米的EZI和30个WPS氧化锆块体在三个亚组中分别于1440、1500和1530°C下进行研磨和烧结。根据ISO2015标准，使用三球活塞式试验机测量试样的抗弯强度。采用单因素方差分析对数据进行分析。EZI在144°C、1500°C和1530°C亚组中的平均抗弯强度分别为1.31±0.49、1.09±0.24和1.29±0.48兆帕，WPS氧化锆在1440°C、1500°C和1530°C亚组中的平均抗弯强度分别为1.44±0.61、1.18±0.35和1.33±0.54兆帕。双因素方差分析显示，氧化锆类型（P = 0.484）、温度（P = 0.258）及其相互作用（P = 0.957）对抗弯强度的影响不显著。将烧结温度从1440°C提高到1530°C并不会提高EZI或WPS氧化锆的抗弯强度。
