压制和分层饰面陶瓷与镍铬合金的粘结强度评估。
Evaluation of Bond Strength of Pressed and Layered Veneering Ceramics to Nickel-Chromium Alloy.
作者信息
Farzin Mitra, Khaledi Amir Alireza, Malekpour Behnam, Naseri Mohammad Hassan
机构信息
Dept. of Prosthodontic, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Biomaterial Research Center, Dept. of Prosthodontic, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
出版信息
J Dent (Shiraz). 2015 Sep;16(3 Suppl):230-6.
STATEMENT OF THE PROBLEM
The success of metal- ceramic- restorations (MCR) depends on the presence of strong bond between porcelain and metal substructure.
PURPOSE
The purpose of this study was to evaluate the effect of hot pressing technique on the bond strength of a metal-porcelain composite in comparison to layering technique.
MATERIALS AND METHOD
Thirty Nickel-Chromium specimens were produced by two methods; conventional porcelain layering on metal and hot pressing (n=15). Bond strengths of all specimens were assessed by the means of three-point bending test according to ISO 9693: 1999 (E) instructions. The data were analyzed using Students t-test (p< 0.001).
RESULTS
The mean ± SD bond strength of conventional and hot pressing technique was 48.29 ± 6.02 and 56.52 ± 4.97, respectively. Therefore, the conventional layering technique yielded significantly lower mean bond strength values than hot pressing technique (p< 0.001).
CONCLUSION
This study showed that it is possible to improve metal-porcelain bond strength significantly by applying an overpressure during porcelain firing.
问题陈述
金属烤瓷修复体（MCR）的成功取决于瓷与金属基底之间存在牢固的粘结。
目的
本研究的目的是评估热压技术与分层技术相比对金属瓷复合材料粘结强度的影响。
材料与方法
通过两种方法制备30个镍铬试件；在金属上进行传统瓷分层和热压（n = 15）。根据ISO 9693:1999（E）指令，通过三点弯曲试验评估所有试件的粘结强度。使用学生t检验分析数据（p < 0.001）。
结果
传统技术和热压技术的平均粘结强度±标准差分别为48.29±6.02和56.52±4.97。因此，传统分层技术产生的平均粘结强度值明显低于热压技术（p < 0.001）。
结论
本研究表明，在瓷烧结过程中施加过压可以显著提高金属瓷粘结强度。
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