Shear bond strengths between different zirconia cores and veneering ceramics and their susceptibility to thermocycling
Shear bond strengths between different zirconia cores and veneering ceramics and their susceptibility to thermocycling
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DOI：
10.1016/j.dental.2008.03.028
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发表时间：
2008-11-01
期刊：
影响因子：
5
通讯作者：
Strub, Joerg R.
中科院分区：
文献类型：
--
作者：
Guess, Petra C.;Kulis, Andreja;Strub, Joerg R.
目标.本研究的目的是评估各种商业氧化锆核和饰面陶瓷之间的剪切粘结强度，并探讨热循环的影响。采用Schmitz-Schulmeyer试验方法评价三种氧化锆核陶瓷（Cercon Base、Vita In-Ceram YZ Cubes、DC-Zirkon）及其制造商推荐的饰面陶瓷（Cercon Ceram S、Vita VM 9、IPS e.max Ceram）的核-饰面剪切粘结强度（SBS）。使用金属陶瓷系统（Degudent U94，Vita VM 13）作为三个全陶瓷试验组的对照组（n = 30个样本/组）。每组一半（n = 15）进行热循环（5-55 ℃，20，000次循环）。随后，在万能试验机中对所有样本施加剪切力。对断裂的标本进行显微镜下评估，以确定失效模式。初始平均SBS值（MPa +/- S.D.）Vita In-Ceram YZ Cubes/Vita VM9为12.5 +/- 3.2，DC-Zirkon/IPS e.max Ceram为11.5 +/- 3.4，Cercon Base/Cercon Ceram S为9.4 +/- 3.2。热循环后，观察到DC-Zirkon/IPS e.max Ceram的平均SBS值为11.5 +/- 1.7 MPa，Vita In-Ceram YZ Cubes/Vita VM 9的平均SBS值为9.7 +/- 4.2 MPa，Cercon Base/Cercon Ceram S的平均SBS值为9.6 +/- 4.2 MPa。全陶瓷试验组的SBS值之间的差异以及热循环对所有组的影响均无统计学显著性。不考虑热循环，金属陶瓷对照组（27.6 +/- 12.1 MPa，26.4 +/- 13.4 MPa）的平均SBS显著高于所有三个测试的全陶瓷组。全瓷组表现为贴面瓷内聚和界面粘结相结合的破坏模式，而金属瓷组则以内聚破坏为主。结果表明，热循环不影响氧化锆瓷芯与饰面瓷之间的SBS。氧化锆核和饰面陶瓷都不能达到金属陶瓷组合的高粘结强度值。(C)2008年，牙科材料学院。由爱思唯尔有限公司出版。保留所有权利。
Objectives. The purpose of this study was to evaluate the shear bond strength between various commercial zirconia core and veneering ceramics, and to investigate the effect of thermocycling.Methods. The Schmitz-Schulmeyer test method was used to evaluate the core-veneer shear bond strength (SBS) of three zirconia core ceramics (Cercon Base, Vita In-Ceram YZ Cubes, DC-Zirkon) and their manufacturer recommended veneering ceramics (Cercon Ceram S, Vita VM9, IPS e.max Ceram). A metal ceramic system (Degudent U94, Vita VM13) was used as a control group for the three all-ceramic test groups (n = 30 specimens/group). Half of each group (n = 15) was thermocycled (5-55 degrees C, 20,000 cycles). Subsequently, all specimens were subjected to shear force in a universal testing machine. Fractured specimens were evaluated microscopically to determine the failure mode.Results. The initial mean SBS values in MPa +/- S.D. were 12.5 +/- 3.2 for Vita In-Ceram YZ Cubes/Vita VM9, 11.5 +/- 3.4 for DC-Zirkon/IPS e.max Ceram, and 9.4 +/- 3.2 for Cercon Base/Cercon Ceram S. After thermocycling mean SBS values of 11.5 +/- 1.7 MPa for DC-Zirkon/IPS e.max Ceram, 9.7 +/- 4.2 MPa for Vita In-Ceram YZ Cubes/Vita VM9, and 9.6 +/- 4.2 MPa for Cercon Base/Cercon Ceram S were observed. Neither the differences between the SBS values of the all-ceramic test groups nor the influence of thermocycling on all groups were statistically significant. Irrespective of thermocycling the metal ceramic control group (27.6 +/- 12.1 MPa, 26.4 +/- 13.4 MPa) exhibited significantly higher mean SBS than all three all-ceramic groups tested. The all-ceramic groups showed combined failure modes as cohesive in the veneering ceramic and adhesive at the interface, whereas the metal ceramic group showed predominately cohesive fractures.Significance. The results indicated that the SBS between zirconia core and veneering ceramics was not affected by thermocycling. None of the zirconia core and veneering ceramics could attain the high bond strength values of the metal ceramic combination. (C) 2008 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.