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Residual stress profiles in veneering ceramic on Y-TZP, alumina and ZTA frameworks: Measurement by hole-drilling

机译:Y-TZP,氧化铝和ZTA框架上饰面陶瓷中的残余应力分布:通过钻孔测量

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摘要

Objectives. The residual stress profile developed within the veneering ceramic during the manufacturing process is an important predicting factor in chipping failures, which constitute a well-known problem with yttria-tetragonal-zirconia polycrystal (Y-TZP) based restorations. The objectives of this study are to measure and to compare the residual stress profile in the veneering ceramic layered on three different polycrystalline ceramic framework materials: Y-TZP, alumina polycrystal (AL) and zirconia toughened alumina (ZTA). Methods. The stress profile was measured with the hole-drilling method in bilayered disk samples of 19 mm diameter with a 0.7 mm thick Y-TZP, AL or ZTA framework and a 1.5 mm thick layer of the corresponding veneering ceramic. Results. The AL samples exhibited increasing compressive stresses with depth, while com-pressive stresses switching into interior tensile stresses were measured in Y-TZP samples. ZTA samples exhibited compressive stress at the ceramic surface, decreasing with depth up to 0.6 mm from the surface, and then becoming compressive again near the framework. Significance. Y-TZP samples exhibited a less favorable stress profile than those of AL and ZTA samples. Results support the hypothesis of the occurrence of structural changes within the Y-TZP surface in contact with the veneering ceramic to explain the presence of tensile stresses. Even if the presence of Y-TZP in the alumina matrix seems to negatively affect the residual stress profiles in ZTA samples in comparison with AL samples, the registered profiles remain positive in terms of veneer fracture resistance.
机译:目标。在制造过程中,饰面陶瓷内产生的残余应力分布是导致崩刃故障的重要预测因素,这是基于钇-四方-氧化锆多晶体(Y-TZP)修复体的众所周知的问题。这项研究的目的是测量和比较在三种不同的多晶陶瓷骨架材料(Y-TZP,氧化铝多晶(AL)和氧化锆增韧氧化铝(ZTA))上层叠的饰面陶瓷中的残余应力分布。方法。应力分布通过钻孔方法在直径为19 mm的双层圆盘样品中测量,该样品具有0.7 mm厚的Y-TZP,AL或ZTA骨架和1.5 mm厚的相应饰面陶瓷层。结果。 AL样品显示出随深度增加的压缩应力,而Y-TZP样品中测得的压应力转换成内部拉应力。 ZTA样品在陶瓷表面表现出压缩应力,随着距表面的深度达到0.6 mm而减小,然后在框架附近再次变为压缩应力。意义。与AL和ZTA样品相比,Y-TZP样品的应力分布较差。结果支持了与贴面陶瓷接触的Y-TZP表面内结构变化发生的假说,以解释拉应力的存在。即使氧化铝基质中Y-TZP的存在似乎与AL样品相比对ZTA样品中的残余应力分布有负面影响,但在胶合板抗撕裂性方面,已记录的分布仍保持正值。

著录项

  • 来源
    《Dental materials》 |2014年第2期|105-111|共7页
  • 作者单位

    Department of Biomaterials and Oral Biology, School of Dentistry, University of Sao Paulo, Brazil;

    Unite de Recherches Biomateriaux Innovants et Interfaces (URB2I-EA4462), Universite Paris Descartes, Sorbonne Paris Cite, Faculte de Chirurgie Dentaire, Paris, France;

    Department of Biomaterials and Oral Biology, School of Dentistry, University of Sao Paulo, Brazil;

    Unite de Recherches Biomateriaux Innovants et Interfaces (URB2I-EA4462), Universite Paris Descartes, Sorbonne Paris Cite, Faculte de Chirurgie Dentaire, Paris, France,Department of Fixed Prosthodontics, Institute of Dentistry, University of Liege Hospital (ULg, CHU, LIMARC), 45 Quai G. Kurth, Liege 4020, Belgium;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Residual stress; Hole-drilling; Zirconia; Alumina; Zirconia toughened alumina; Chipping; Veneering ceramic;

    机译:残余应力;钻孔;氧化锆氧化铝;氧化锆增韧氧化铝;碎裂饰面陶瓷;
  • 入库时间 2022-08-18 03:46:56

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