使用高钯合金的陶瓷前和陶瓷后焊接连接器的比较拉伸强度。

Shehab Abdul-Hadi, Pappas Maria, Burns David R, Douglas Hugh, Moon Peter C

Virginia Commonwealth University School of Dentistry, Richmond, VA 23298-0566, USA.

J Prosthet Dent. 2005 Feb;93(2):148-52. doi: 10.1016/j.prosdent.2004.11.013.

STATEMENT OF PROBLEM

It is not known whether different high-palladium alloys of similar composition possess comparable tensile strength properties associated with connector soldering.

PURPOSE

The purpose of this study was to evaluate the tensile strength properties of 2 high-palladium alloys on soldered connectors under simulated pre-ceramic and post-ceramic soldering conditions.

MATERIAL AND METHODS

Eighty cylindrical castings were fabricated (Rx Naturelle Plus alloy and Option alloy). The 40 castings for each alloy were subdivided into 2 groups of 20 each. In the first group, castings for each alloy were randomly paired and soldered with presolder (SMG2) to produce 10 preceramic test connector specimens for each alloy. In the second group, castings were similarly paired and soldered with postsolder (490 fine) to produce 10 postceramic test connector specimens for each alloy. Each soldered connector was subjected to tensile force until failure in a universal testing machine. Statistical analysis using a Wilcoxon rank sums test was performed (alpha=.05)

RESULTS

No significant difference was found between the mean tensile failure stress for Rx Naturelle Plus preceramic solder (344.7 +/- 77.6 MPa) compared to Option preceramic solder (411.5 +/- 112.8 MPa) (P =.1202). However, the mean tensile failure stress for Rx Naturelle Plus postceramic solder (260.8 +/- 223.7 MPa) was significantly lower than the Option postceramic solder (312.6 +/- 120.8 MPa) (P =.0407). Not only did Rx Naturelle Plus postceramic solder connectors show evidence of lower strength, but also an increased variation among specimens.

CONCLUSIONS

Rx Naturelle Plus solder connectors provided better strength with the preceramic as opposed with the postceramic connectors. For postsolder connectors, Rx Naturelle Plus alloy had less acceptable strength and a wider variation, suggesting it is more technique sensitive than Option alloy connectors.

问题陈述

尚不清楚成分相似的不同高钯合金在连接体焊接方面是否具有相当的拉伸强度特性。

目的

本研究的目的是评估两种高钯合金在模拟烤瓷前和烤瓷后焊接条件下焊接连接体的拉伸强度特性。

材料与方法

制作了80个圆柱形铸件（Rx Naturelle Plus合金和Option合金）。每种合金的40个铸件再分为两组，每组20个。在第一组中，每种合金的铸件随机配对，用预焊料（SMG2）焊接，为每种合金制作10个烤瓷前测试连接体标本。在第二组中，铸件同样配对，用后焊料（490 fine）焊接，为每种合金制作10个烤瓷后测试连接体标本。每个焊接连接体在万能试验机上承受拉伸力直至破坏。采用Wilcoxon秩和检验进行统计分析（α = 0.05）。

结果

Rx Naturelle Plus烤瓷前焊料的平均拉伸破坏应力（344.7±77.6 MPa）与Option烤瓷前焊料（411.5±112.8 MPa）相比，未发现显著差异（P = 0.1202）。然而，Rx Naturelle Plus烤瓷后焊料的平均拉伸破坏应力（260.8±223.7 MPa）显著低于Option烤瓷后焊料（312.6±120.8 MPa）（P = 0.0407）。Rx Naturelle Plus烤瓷后焊料连接体不仅强度较低，而且标本间的差异也更大。