Dokuzlu Seren Nur, Subaşı Meryem Gülce
Bornova Oral and Dental Health Center, İzmir, Turkey.
Department of Prosthodontics, Faculty of Dentistry, Kütahya Sağlık Bilimleri University, Kütahya, Turkey.
J Adv Prosthodont. 2024 Feb;16(1):25-37. doi: 10.4047/jap.2024.16.1.25. Epub 2024 Feb 23.
To investigate the effect of sintering programs and surface treatments on surface properties, phase transformation and flexural strength of monolithic zirconia.
Zirconia specimens were sintered using three distinct sintering programs [classic (C), speed (S), and superspeed (SS)] (n = 56, each). One sample from each group underwent scanning electron microscopy (SEM) and grain size analysis following sintering. Remaining samples were divided into five subgroups (n = 11) based on the surface treatments: control (CL), polish (P), glaze (G), grind + polish (GP), and grind + glaze (GG). One sample from each subgroup underwent SEM analysis. Remaining samples were thermally aged. Monoclinic phase volume, surface roughness, and three-point flexural strength were measured. Monoclinic phase volume and surface roughness were analyzed by Kruskal-Wallis and Dunn tests. Flexural strength was analyzed by two-way ANOVA and Weibull analysis. The relationships among the groups were analyzed using Spearman's correlation analysis.
Sintering program, surface treatment, and sintering × surface treatment ( ≤ .010) affected the monoclinic phase volume, whereas the type of surface treatment and sintering × surface treatment affected the surface roughness ( < .001). Type of sintering program or surface treatment did not affect the flexural strength. Weibull analysis revealed no significant differences between the m and σ values. Monoclinic phase volume was positively correlated with surface roughness in the SGG and SSP groups.
After sintering monolithic zirconia in each of the three sintering programs, each of the surface treatments can be used. However, for surface quality and aging resistance, G or GG can be recommended as a surface finishing method.
研究烧结程序和表面处理对整体式氧化锆表面性能、相变及抗弯强度的影响。
采用三种不同的烧结程序[经典（C）、快速（S）和超快速（SS）]对氧化锆试样进行烧结（每组n = 56）。每组各取一个样品在烧结后进行扫描电子显微镜（SEM）和晶粒尺寸分析。其余样品根据表面处理分为五个亚组（n = 11）：对照组（CL）、抛光（P）、上釉（G）、研磨+抛光（GP）和研磨+上釉（GG）。每个亚组各取一个样品进行SEM分析。其余样品进行热老化处理。测量单斜相体积、表面粗糙度和三点抗弯强度。单斜相体积和表面粗糙度采用Kruskal-Wallis和Dunn检验进行分析。抗弯强度采用双向方差分析和威布尔分析进行分析。采用Spearman相关分析分析各组之间的关系。
烧结程序、表面处理以及烧结×表面处理（P≤.010）影响单斜相体积，而表面处理类型和烧结×表面处理影响表面粗糙度（P<.001）。烧结程序类型或表面处理类型不影响抗弯强度。威布尔分析显示m和σ值之间无显著差异。在SGG组和SSP组中，单斜相体积与表面粗糙度呈正相关。
在三种烧结程序中的每一种对整体式氧化锆进行烧结后，均可采用每种表面处理。然而，对于表面质量和耐老化性，可推荐G或GG作为表面精加工方法。
