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Influence of veneering porcelain thickness and cooling rate on residual stresses in zirconia molar crowns

机译:饰面烤瓷厚度和冷却速率对氧化锆磨牙冠残余应力的影响

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摘要

Objective. The aim of this study was to investigate the influence of increasing veneering porcelain thickness in clinically representative zirconia molar crowns on the residual stresses under fast and slow cooling protocols. Methods. Six veneered zirconia copings (Procera, Nobel Biocare AB, Gothenburg, Sweden) based on a mandibular molar form, were divided into 3 groups with flattened cusp heights that were 1mm, 2 mm, or 3 mm. Half the samples were fast cooled during final glazing; the other half were slow cooled. Vickers indentation technique was used to determine surface residual stresses. Normality distribution within each sample was done using Kolmogorov-Smirnov & Shapiro-Wilk tests, and one-way ANOVA tests used to test for significance between various cusp heights within each group. Independent t-tests used to evaluate significance between each cusp height group with regards to cooling. Results. Compressive stresses were recorded with fast cooling, while tensile stresses with slow cooling. The highest residual compressive stresses were recorded on the fast cooled 1 mm cusps which was significantly higher than the 2 and 3 mm fast cooled crowns (P < 0.05). There was a significant linear trend for residual stress to decrease as veneering porcelain thickness increased in the fast cooled group (P < 0.05). No significant differences were found between the various cusp heights during slow cooling (P ≥ 0.05). Significance. Cooling rate and geometric influences in a crown anatomy have substantially different effects on residual stress profiles with increasing veneering porcelain thickness compared to the basic flat plate model.
机译:目的。这项研究的目的是研究在快速和慢速冷却方案下,临床上具有代表性的氧化锆磨牙冠中饰面瓷厚度的增加对残余应力的影响。方法。基于下颌磨牙形式的六个单板氧化锆顶盖(Procera,Nobel Biocare AB,瑞典哥德堡)被分为3组,其尖顶高度平坦,分别为1mm,2mm或3mm。在最后的上光过程中,有一半样品被快速冷却;另一半缓慢冷却。使用维氏压痕技术确定表面残余应力。使用Kolmogorov-Smirnov和Shapiro-Wilk检验完成每个样本中的正态分布,并使用单向ANOVA检验来检验每组中各个尖点高度之间的显着性。独立的t检验用于评估各个尖端高度组之间在冷却方面的显着性。结果。在快速冷却下记录了压应力,而在缓慢冷却下记录了拉应力。在快速冷却的1 mm牙尖上记录到最高的残余压应力,明显高于2和3 mm的快速冷却牙冠(P <0.05)。在快速冷却组中,随着饰面瓷厚度的增加,残余应力有明显的线性下降趋势(P <0.05)。在缓慢冷却过程中,各种尖端高度之间没有发现显着差异(P≥0.05)。意义。与基本平板模型相比,随着镶面瓷厚度的增加,冠部解剖结构中的冷却速率和几何影响对残余应力分布具有显着不同的影响。

著录项

  • 来源
    《Dental materials》 |2014年第3期|271-280|共10页
  • 作者单位

    Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand,Department of Oral Rehabilitation, Faculty of Dentistry, PO Box 647, Dunedin 9054, New Zealand;

    Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand;

    Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand;

    Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand;

  • 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

    Zirconia; Porcelain; Crowns; Residual stresses; Chipping; Thickness of veneer; Cooling protocol; Vickers indentation;

    机译:氧化锆瓷;冠;残余应力;碎裂单板厚度;冷却方案维氏压痕;
  • 入库时间 2022-08-18 03:46:56

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