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首页> 外文期刊>Journal of dentistry >Effect of core ceramic grinding on fracture behaviour of bilayered lithium disilicate glass-ceramic under two loading schemes
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Effect of core ceramic grinding on fracture behaviour of bilayered lithium disilicate glass-ceramic under two loading schemes

机译：芯陶瓷研磨对两种装载方案下双层锂大胆玻璃玻璃骨折行为的影响

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摘要

Objectives The purpose of this in vitro study was to evaluate the effect of core ceramic grinding on the fracture behaviour of bilayered lithium disilicate glass-ceramic (LDG) under two loading schemes.Methods Interfacial surfaces of sandblasted LDG disks (A) were ground with 220 (B), 500 (C) and 1200 (D) grit silicon carbide (SiC) sandpapers, respectively. Surface roughness and topographic analysis were performed using a profilometer and a scanning electron microscopy (SEM), and then underwent retesting after veneer firing. Biaxial fracture strength (σf) and Weibull modulus (m) were calculated either with core in tension (subgroup t) or in compression (subgroup c). Failure modes were observed by SEM, and loading induced stress distribution was simulated and analyzed by finite element analysis. Statistical data analysis was performed using Kruskal-Wallis, one-way ANOVA, and paired test at a significance level of 0.05.Results As the grits size of SiC increased, LDG surface roughness decreased from group A to D (p 0.001), which remained unchanged after veneer firing. No difference in σf (p = 0.41 for subgroups At-Dt; p = 0.11 for subgroups Ac-Dc), m values as well as failure modes was found among four subgroups for both loading schemes. Specimens in subgroup t showed higher σf (p 0.001) and m values than subgroup c. Stress distribution between loading schemes did not differ from each other. Cracks, as the dominant failure mode initiated from bottom tensile surface. No sign of interfacial cracking or delamination was observed for all groups.Conclusions Technician grinding changed surface topography of LDG ceramic material, but was not detrimental to the bilayered system strength after veneer application. LDG bilayered system was more sensitive to fracture when loaded with veneer porcelain in tension.Clinical significance Within the limitations of the simulated grinding applied, it is concluded that veneer porcelain can be applied directly after technician grinding of LDG ceramic as it has no detrimental effect on the strength of bilayered structures. The connector areas of LDG fixed dental prosthesis are more sensitive to fracture compared with single crowns, and should be fabricated with more caution.
机译：目的在体外研究的目的是评估核心陶瓷研磨对两种装载方案的双层锂大胆玻璃 - 陶瓷（LDG）的裂缝行为的影响。砂刺的LDG盘（A）的界面接地为220 （b），500（c）和1200（d）砂砂碳化硅（SiC）碳粉盒。使用型材仪和扫描电子显微镜（SEM）进行表面粗糙度和地形分析，然后在胶合烧制后进行重新测试。在张力（亚组t）或压缩（亚组c）中，计算双轴断裂强度（σf）和微泡模量（m）。通过SEM观察失败模式，通过有限元分析模拟并分析负载诱导的应力分布。使用Kruskal-Wallis，单向ANOVA和成对测试进行统计数据分析，其显着性水平为0.05.结果，因为SiC增加的粗糙度增加，LDG表面粗糙度从A组到D降低（P <0.001），在饰板射击后保持不变。 ΣF没有差异（用于亚组的子组的P = 0.41; P = 0.11用于子组AC-DC），在两个加载方案中的四个子组中发现了M值以及故障模式。子组T中的标本显示比子组C更高的ΣF（P <0.001）和M值。装载方案之间的应力分布并没有彼此不同。裂缝，作为从底部拉伸表面引发的主要失效模式。对于所有组，没有观察到界面裂缝或分层的迹象。结论技术人员研磨改变了LDG陶瓷材料的表面形貌，但在胶合剂应用后对双层系统强度没有不利。 LDG双层系统在张紧胶带瓷器时对骨折更敏感。在施加模拟磨削的局限质内旋流意义，得出结论，胶芯可以直接应用在LDG陶瓷的技术人员研磨后，因为它没有不利影响双层结构的强度。与单冠相比，LDG固定牙科假体的连接器区域对断裂更敏感，并且应更谨慎地制造。

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  • 来源
    《Journal of dentistry》 |2014年第11期|共10页
  • 作者

    WangX.-D.; JianY.-T.; GuessP.C.; SwainM.V.; ZhangX.-P.; ZhaoK.;

  • 作者单位

    Department of Prosthodontics Guanghua School of Stomatology Sun Yat-sen UniversityGuangzhou China;

    Institute of Stomatological Research Guangdong Provincial Key Laboratory of Stomatology Sun Yat;

    Department of Prosthodontics School of Dentistry Albert-Ludwigs UniversityFreiburg Germany;

    Department of Prosthodontics School of Dentistry Albert-Ludwigs UniversityFreiburg Germany;

    Department of Metallic Materials Science and Engineering School of Materials Science and;

    Department of Prosthodontics Guanghua School of Stomatology Sun Yat-sen UniversityGuangzhou China;

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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

    Dental porcelain; Finite element analysis; Fractography; Fracture strength;

    机译：牙科陶瓷;有限元分析;断裂;断裂强度;

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