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首页> 外文期刊>Journal of dentistry >Microstructural changes produced by abrading Y-TZP in presintered and sintered conditions
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Microstructural changes produced by abrading Y-TZP in presintered and sintered conditions

机译：在预烧结和烧结条件下研磨Y-TZP产生的微观结构变化

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摘要

Objective: To evaluate the effect of abrading before and after sintering using alumina-based abrasives on the surface of yttria-tetragonal zirconia polycrystals. Particular attention was paid to the amount of surface stress-assisted phase transformation (tetragonal??monoclinic) and the presence of microcracks. Methods: Pre-sintered zirconia ceramic specimens (ZirCAD; Ivoclar Vivadent) were first surface-ground flat with #600-800-1000-grit SiC paper. They were then surface-treated with different grain size abrasives before and after the sintering step. Samples that underwent no surface treatment were used as controls. For each condition, eight specimens were prepared. The physical/mechanical characteristics of zirconia material were determined by measuring density, porosity, grain size, hardness, and fracture toughness. The effects of surface treatments were assessed by surface roughness measurements, quantitative X-ray diffraction analysis, and scanning electron microscopy. Results: With increased dimensions of the abrasive particles, the abraded surfaces of zirconia specimens exhibited a widespread system of microcracks and an increased monoclinic zirconia quantity. These structural changes likely affect the aging of the material during its clinical service. ? 2012 Elsevier Ltd. All rights reserved.
机译：目的：使用氧化铝 - 四氧化锆多晶对氧化铝 - 四方氧化锆多晶体表面进行磨削前后烧结磨损的影响。特别注意的是表面应激辅助相变（四方载体单斜）和微裂纹的存在量。方法：预烧结氧化锆陶瓷标本（Zircad; Ivoclar Vievadent）是第一个表面地面平面＃600-800-1000砂纸。然后在烧结步骤之前和之后用不同的晶粒尺寸磨料进行表面处理。使用无表面处理的样品用作对照。对于每个条件，制备八个标本。通过测量密度，孔隙率，粒度，硬度和断裂韧性来确定氧化锆材料的物理/机械特性。通过表面粗糙度测量，定量X射线衍射分析和扫描电子显微镜评估表面处理的影响。结果：随着磨料颗粒的尺寸增加，氧化锆标本的磨损表面表现出广泛的微裂纹系统和单斜氧化锆量增加。这些结构变化可能在临床服务期间影响材料的老化。还2012年elestvier有限公司保留所有权利。

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  • 来源
    《Journal of dentistry》 |2013年第2期|共6页
  • 作者

    MonacoC.; TucciA.; EspositoL.; ScottiR.;

  • 作者单位

    Department of Oral Sciences Division of Prosthodontics and Maxillo-facial Rehabilitation;

    Department of Oral Sciences Division of Prosthodontics and Maxillo-facial Rehabilitation;

    Department of Oral Sciences Division of Prosthodontics and Maxillo-facial Rehabilitation;

    Department of Oral Sciences Division of Prosthodontics and Maxillo-facial Rehabilitation;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 口腔科学;
  • 关键词

    Abrading; CAD CAM; Tetragonal; Y-TZP; Zirconia;

    机译：研磨;CAD CAM;四方;Y-TZP;氧化锆;

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