陶瓷压制金属与长石质烤瓷熔附金属：粘结强度的比较研究

Ceramic pressed to metal versus feldspathic porcelain fused to metal: a comparative study of bond strength.

作者信息

Venkatachalam Bhavani, Goldstein Gary R, Pines Mitchell S, Hittelman Eugene L

机构信息

Division of Advanced Prosthodontics, University of California, Los Angeles, California 90095, USA.

出版信息

Int J Prosthodont. 2009 Jan-Feb;22(1):94-100.

PMID:19260436

Abstract

PURPOSE

The aim of this study was to compare the debond/crack initiation strength (D/CIS) of a leucite-based low-fusing ceramic pressed (PC) to metal and feldspathic porcelain (FP) fused to metal.

MATERIALS AND METHODS

Forty rectangular metal specimens, 20 noble alloy (NA; gold-palladium) and 20 base metal alloy (BA; cobalt-chromium) were fabricated per ISO 9693:1999 standards (25.0 mm x 0.5 mm x 3.0 mm). Ten samples in each group received FP and the remaining 10 received PC. The samples in the PC group underwent wax pattern build-ups and subsequent investing and casting. The ceramic dimensions in all four groups were 8.0 mm x 1.0 mm x 3.0 mm. The final metal-ceramic specimen thickness was 1.5 mm. All specimens were subject to the Schwickerath crack-initiation three-point bending test at a crosshead speed of 1.5 mm/min. Metal-ceramic fracture loads were recorded in Newtons and D/CIS was calculated using the formula: tau(b) = k x Ffail.

RESULTS

Mean D/CIS were as follows: BA-FP: 36.11 +/- 2.31 MPa, NA-FP: 42.64 +/- 1.94 MPa, BA-PC: 37.47 +/- 6.02 MPa, and NA-PC: 47.94 +/- 3.92 MPa. A 2-way ANOVA revealed no significant difference in D/CIS values between the four groups. A statistically significant difference was noted when comparing the mean D/CIS values obtained between the two metal alloys used (NA: 45.29 MPa and BA: 36.79 MPa).

CONCLUSION

No differences (P > .05) in mean D/CIS were found between the low-fusing ceramic pressed to metal and the FP fused to metal. A higher mean D/CIS (P > .05) was found for the NA compared to the BA, with both ceramics tested.

摘要

目的

本研究旨在比较白榴石基低熔烤瓷（PC）与金属及长石质烤瓷（FP）熔附金属的脱粘/裂纹起始强度（D/CIS）。

材料与方法

按照ISO 9693:1999标准制作40个矩形金属试件，其中20个为贵金属合金（NA；金钯合金），20个为贱金属合金（BA；钴铬合金）（25.0 mm×0.5 mm×3.0 mm）。每组10个样本采用FP，其余10个采用PC。PC组样本进行蜡型制作，随后包埋和铸造。所有四组的陶瓷尺寸均为8.0 mm×1.0 mm×3.0 mm。最终金属烤瓷试件厚度为1.5 mm。所有试件在十字头速度为1.5 mm/min的条件下进行施维克拉特裂纹起始三点弯曲试验。记录金属烤瓷的断裂载荷（单位为牛顿），并使用公式tau(b) = k×Ffail计算D/CIS。

结果

平均D/CIS如下：BA-FP：36.11±2.31 MPa，NA-FP：42.64±1.94 MPa，BA-PC：37.47±6.02 MPa，NA-PC：47.94±3.92 MPa。双向方差分析显示四组之间的D/CIS值无显著差异。比较两种所用金属合金（NA：45.29 MPa和BA：36.79 MPa）获得的平均D/CIS值时，发现存在统计学显著差异。