Yahyazadehfar Niknaz, Azimi Zavaree Maryam, Shayegh Sayed Shojaedin, Yahyazadehfar Mobin, Hooshmand Tabassom, Hakimaneh Seyed Mohammad Reza
Department of Prosthodontics, Faculty of Dentistry, Shahed University, Tehran, Iran.
Independent Investigator, Delaware, USA.
J Dent Res Dent Clin Dent Prospects. 2021 Summer;15(3):210-218. doi: 10.34172/joddd.2021.035. Epub 2021 Aug 25.
Interfacial failures at the cement‒restoration interface highlights the importance of effective surface treatment with no adverse effect on the zirconia's mechanical properties. This study aimed to determine the effect of different surface treatments on dental graded zirconia's surface roughness and certain mechanical properties. Forty sintered zirconia specimens were randomly divided into four groups (n=10): control (no surface treatment), sandblasting (SA), grinding with diamond bur (GB), and Er,Cr:YSGG laser (LS). Following surface treatment, the surface roughness and surface topography of the specimens were examined. X-ray diffraction (XRD) was conducted. In addition, the biaxial flexural strengths of specimens were evaluated. The data were analyzed using one-way analysis of variance (ANOVA) and post hoc Tukey tests; the Pearson correlation coefficient was calculated between either volumetric percentage of monoclinic phase or roughness and flexural strength of specimens (α=0.05). The GB group exhibited significantly greater surface roughness compared to the other groups ( < 0.005). The LS and control groups exhibited a significantly lower volumetric percentage of the monoclinic phase ( < 0.001) than the GB and SA treatments. The SA group exhibited significantly higher flexural strength than the control ( = 0.02) and GB groups ( < 0.01). Furthermore, the Weibull analysis for the LS showed higher reliability for the flexural strength than other treatments. Er,Cr:YSGG laser treatment, with the lowest extent of phase transformation and reliable flexural strength, can be a promising choice for surface treatment of zirconia.
水泥与修复体界面处的界面失效凸显了有效表面处理的重要性，且这种处理对氧化锆的机械性能无不利影响。本研究旨在确定不同表面处理对牙科分级氧化锆表面粗糙度和某些机械性能的影响。将40个烧结氧化锆试件随机分为四组（n = 10）：对照组（未进行表面处理）、喷砂处理（SA）、用金刚石车针打磨（GB）和Er,Cr:YSGG激光处理（LS）。表面处理后，检查试件的表面粗糙度和表面形貌。进行X射线衍射（XRD）分析。此外，评估试件的双轴弯曲强度。使用单因素方差分析（ANOVA）和事后Tukey检验对数据进行分析；计算试件的单斜相体积百分比或粗糙度与弯曲强度之间的Pearson相关系数（α = 0.05）。与其他组相比，GB组的表面粗糙度显著更高（< 0.005）。LS组和对照组的单斜相体积百分比显著低于GB组和SA处理组（< 0.001）。SA组的弯曲强度显著高于对照组（= 0.02）和GB组（< 0.01）。此外，对LS组的威布尔分析表明其弯曲强度的可靠性高于其他处理。Er,Cr:YSGG激光处理具有最低的相变程度和可靠的弯曲强度，可能是氧化锆表面处理的一个有前景的选择。
