Comparison of edge chipping resistance of PFM and veneered zirconia specimens
Comparison of edge chipping resistance of PFM and veneered zirconia specimens
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DOI：
10.1016/j.dental.2009.08.005
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发表时间：
2010-01-01
期刊：
影响因子：
5
通讯作者：
Quinn, George D.
中科院分区：
文献类型：
--
作者：
Quinn, Janet B.;Sundar, Veeraraghavan;Quinn, George D.
目标。目的研究氧化锆贴面试件的抗切屑性能，并与烤瓷(PFM)试件的抗切屑性能进行比较。制备贴面氧化锆和烤瓷贴面试件，厚度与临床相关。用不同大小的力对试件边缘进行切屑，产生不同尺寸的切屑。尺寸的范围包括没有完全穿透贴面到衬底的小芯片，也包括非常大的可以到达氧化锆或金属衬底的芯片。绘制了力大小与切屑尺寸(边缘距离)之间的关系图。比较了氧化锆贴面试件和烤瓷修复体试件的曲线。还得到了贴面和基材的努氏硬度-力图。氧化锆和烤瓷贴面的切割数据遵循幂定律(决定系数，R-2>；0.93)，正如文献所预期的那样。这些曲线在合并的数据散布中重叠，表明对碎屑的抵抗程度相似。在两种类型的试件中制造的切屑在到达单板/基材交叉点时都会分离，并且不会渗透到基材中。单板和基材的硬度-载荷曲线在低载荷下都表现出压痕尺寸效应(ISE)。在4N载荷下，不确定度为+/-1标准偏差的Knoop硬度值分别为：(2.02+/-0.08，12.01+/-0.39，4.24+/-0.16和4.36+/-0.02 Gpa)，不同贴面之间无统计学差异(Tukey成对比较在0.95家庭置信度下)。这项工作表明，尽管基板硬度有很大的差异，但贴面氧化锆修复体和烤瓷修复体可能具有类似的抗碎屑性能。没有检测到芯片剥落敏感性的差异，但两种类型的样品中的芯片以类似的方式从两侧分离，而不是延伸到衬底中。(C)2009年牙科材料学会。爱思唯尔有限公司出版。保留所有权利。
Objectives. To investigate the chipping resistance of veneered zirconia specimens and compare it to the chipping resistance of porcelain fused to metal (PFM) specimens.Methods. Veneered zirconia and PFM bar specimens were prepared in clinically relevant thicknesses. The specimen edges were chipped with different magnitude forces, producing chips of various sizes. The range of sizes included small chips that did not penetrate all the way through the veneers to the substrates, and also chips that were very large and reached the zirconia or metal substrates. The relationship between force magnitude and chip size (edge distance) was graphed. The resulting curves were compared for the veneered zirconia and PFM specimens. Knoop hardness vs. force graphs for the veneers and substrates were also obtained.Results. The zirconia and PFM veneer chipping data followed a power law (coefficient of determination, R-2 > 0.93) as expected from the literature. The curves overlapped within the combined data scatter, indicating similar resistance to chipping. The chips made in both types of specimens detached and did not penetrate into the substrate when they reached the veneer/substrate intersections. The hardness-load curves for the veneers and substrates all exhibited an indentation size effect (ISE) at low loads. The Knoop hardness values with uncertainties of +/- one standard deviation at 4N loads for the metal, zirconia, and the metal and zirconia veneers are: (2.02 +/- 0.08, 12.01 +/- 0.39, 4.24 +/- 0.16 and 4.36 +/- 0.02 GPa), respectively, with no statistically significant difference between the veneers (Tukey pairwise comparison at 0.95 family confidence).Significance. This work indicates that a similar resistance to chipping might be expected for veneered zirconia and PFM restorations, in spite of the large difference in substrate hardness. Differences in susceptibility to chip spalling were not detected, but the chips in both specimen types detached off the sides in a similar manner instead of extending into the substrates. (C) 2009 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.