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首页> 外文期刊>The Journal of Prosthetic Dentistry >Shear bond strengths of pressed and layered veneering ceramics to high-noble alloy and zirconia cores.
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Shear bond strengths of pressed and layered veneering ceramics to high-noble alloy and zirconia cores.

机译：压制和层状饰面陶瓷与高贵金属和氧化锆芯的剪切粘结强度。

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STATEMENT OF PROBLEM: Heat-pressed ceramics to metal alloys and zirconia have been available for some time. However, information regarding their shear bond strengths is limited. PURPOSE: The purpose of this study was to evaluate the shear bond strengths of heat-pressed and layered ceramics with regard to their corresponding high-noble alloy and zirconia cores. MATERIAL AND METHODS: Forty cylinders (approx. 5 mm in diameter) of high-noble alloy (Olympia) were cast and divided into 4 groups (n=10). Metal cylinders were veneered with ceramics to produce shear test specimens: Group PMI with IPS InLine POM; Group LMI with IPS InLine; Group PMC with Pulse press-to-metal; and Group LMC with Authentic Pulse Metal ceramic. Forty cylinders (approx. 5 mm in diameter) of zirconia (Lava) were obtained and divided into 4 groups (n=10). These cylinders were veneered with ceramics to produce shear test specimens: Group PZI with IPS e.max ZirPress; Group LZI with IPS e.max. Ceram; Group PZV with VITA PM9; and Group LZV with VITA VM9. The veneering ceramics, 3 mm in thickness, were either pressed or layered to their corresponding cylinders. Thermal cycling was performed at 5 degrees C and 55 degrees C for 20,000 cycles with a 20 second dwell time. Shear bond strength testing was conducted in a universal testing machine, and the failure strengths were recorded. Fracture surfaces were characterized visually, under a stereomicroscope, and with a scanning electron microscope (SEM). Data were analyzed using rank-based Kruskal-Wallis and Mann-Whitney tests with Bonferroni correction to adjust for multiple comparisons (alpha=.05). RESULTS: For metal ceramic specimens, the mean (SD) shear bond strengths ranged from 37.8 (20.6) MPa to 66.4 (22.1) MPa. There were significant differences between Groups PMI and PMC and between Groups LMI and PMC, in which Groups PMI and LMI had significantly higher strength values than Group PMC (P=.041). For zirconia ceramic specimens, the mean (SD) shear bond strengths ranged from 30.03 (9.49) MPa to 47.2 (13.0) MPa, with Group LZV having a significantly higher shear bond strength value than Group LZI (P=.012). Half of the Group PZV specimens failed during thermal cycling, and Group PZV was, therefore, excluded from statistical analysis. For all shear bond strength testing specimens, cohesive failures in the veneering ceramics were observed. CONCLUSIONS: For shear bond strength of veneering ceramics to high-noble alloy, there was no significant difference between pressing and layering with the same manufacturer. For shear bond strength of veneering ceramics to zirconia, there was no significant difference between the pressed and layered groups.
机译：问题陈述：将热压陶瓷制成金属合金和氧化锆已有一段时间了。但是，关于它们的剪切粘结强度的信息是有限的。目的：本研究的目的是评估热压和层状陶瓷相对于其相应的高贵金属合金和氧化锆芯的剪切粘结强度。材料与方法：铸造四十个圆柱体（直径约5毫米）高贵金属（奥林匹亚），分为4组（n = 10）。金属圆柱体用陶瓷贴面以产生剪切测试样本：IPS InLine POM组PMI;使用IPS InLine将LMI分组; PMC组与脉冲压制到金属;和LMC集团采用正宗的脉冲金属陶瓷。获得四十个圆柱体（直径约5毫米）的氧化锆（Lava）并将其分为4组（n = 10）。这些圆柱体用陶瓷贴面，制成剪切试样：IPS e.max ZirPress组PZI;将LZI组与IPS e.max。塞拉姆将PZV与VITA PM9分组;并使用VITA VM9将LZV分组。将厚度为3 mm的贴面陶瓷压制或分层到其相应的圆柱体上。在5摄氏度和55摄氏度进行20,000个循环的热循环，停留时间为20秒。在万能试验机上进行剪切粘结强度测试，并记录破坏强度。在立体显微镜下和用扫描电子显微镜（SEM）目测表征断裂表面。使用基于等级的Kruskal-Wallis和Mann-Whitney检验以及Bonferroni校正对数据进行分析，以调整多个比较（alpha = .05）。结果：对于金属陶瓷样品，平均（SD）剪切粘结强度范围为37.8（20.6）MPa至66.4（22.1）MPa。 PMI和PMC组之间以及LMI和PMC组之间存在显着差异，其中PMI和LMI组的强度值明显高于PMC组（P = .041）。对于氧化锆陶瓷样品，平均（SD）剪切粘结强度范围为30.03（9.49）MPa至47.2（13.0）MPa，其中LZV组的剪切粘结强度值明显高于LZI组（P = .012）。 PZV组的一半样本在热循环过程中失败，因此将PZV组排除在统计分析之外。对于所有剪切粘结强度测试样品，均观察到饰面陶瓷的内聚破坏。结论：对于饰面陶瓷与高贵金属的剪切粘结强度，与同一制造商的压制和分层之间没有显着差异。对于饰面陶瓷与氧化锆的剪切粘结强度，压制组和分层组之间没有显着差异。

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