Guess Petra C, Kulis Andreja, Witkowski Siegbert, Wolkewitz Martin, Zhang Yu, Strub Jörg R
Department of Prosthodontics, University Hospital, Freiburg, Germany.
Dent Mater. 2008 Nov;24(11):1556-67. doi: 10.1016/j.dental.2008.03.028. Epub 2008 May 7.
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.
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.
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.
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.
本研究旨在评估各种商用氧化锆核瓷与饰面瓷之间的剪切粘结强度，并研究热循环的影响。
采用施密茨 - 舒尔迈耶测试方法评估三种氧化锆核瓷（Cercon Base、Vita In-Ceram YZ Cubes、DC-Zirkon）及其制造商推荐的饰面瓷（Cercon Ceram S、Vita VM9、IPS e.max Ceram）的核 - 饰面剪切粘结强度（SBS）。将一种金属陶瓷系统（Degudent U94、Vita VM13）用作三个全瓷测试组的对照组（每组n = 30个样本）。每组的一半（n = 15）进行热循环（5 - 55摄氏度，20,000次循环）。随后，所有样本在万能试验机上承受剪切力。对断裂的样本进行显微镜评估以确定失效模式。
Vita In-Ceram YZ Cubes/Vita VM9的初始平均SBS值（单位：MPa ± 标准差）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，DC-Zirkon/IPS e.max Ceram的平均SBS值为11.5 ± 1.7 MPa，Vita In-Ceram YZ Cubes/Vita VM9为9.7 ± 4.2 MPa，Cercon Base/Cercon Ceram S为9.6 ± 4.2 MPa。全瓷测试组的SBS值之间的差异以及热循环对所有组的影响均无统计学意义。无论是否进行热循环，金属陶瓷对照组（27.6 ± 12.1 MPa，26.4 ± 13.4 MPa）的平均SBS均显著高于所有三个测试的全瓷组。全瓷组显示出组合的失效模式，即在饰面瓷中为内聚破坏，在界面处为粘结破坏，而金属陶瓷组主要显示内聚断裂。
结果表明氧化锆核瓷与饰面瓷之间的SBS不受热循环影响。没有一种氧化锆核瓷和饰面瓷能达到金属陶瓷组合的高粘结强度值。
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