Department of Prosthetic Dentistry, Mustafa Kemal University, Hatay, Turkey.
J Adv Prosthodont. 2013 Feb;5(1):44-50. doi: 10.4047/jap.2013.5.1.44. Epub 2013 Feb 28.
The aim of this study was to evaluate the effects of repeated porcelain firing process on the corrosion rates of the dental alloys.
Cr-Co, Cr-Ni and Pd-Ag alloys were used for this study. Each metal supported porcelain consisted of 30 specimens of 10 for 7, 9 and 11 firing each. Disc-shaped specimens 10 mm diameter and 3 mm thickness were formed by melting alloys with a propane-oxygen flame and casted with a centrifuge casting machine and then with the porcelain veneer fired onto the metal alloys. Corrosion tests were performed in quintuplicate for each alloy (after repeated porcelain firing) in Fusayama artificial saliva solution (pH = 5) in a low thermal-expansion borosilicate glass cell. Tamhane and Sheffe test was used to compare corrosion differences in the results after repeated firings and among 7, 9 and 11 firing for each alloy. The probability level for statistical significance was set at α=0.05.
The corrosion resistance was higher (30 mV), in case of 7 times firing (Commercial). On the other hand, it was lower in case of 11 times firing (5 mV) (P<.05).
Repeated firings decreased corrosion resistance of Pd-Ag, Cr-Co and Cr-Ni alloys. The Pd-Ag alloy exhibited little corrosion in in vitro tests. The Cr-Ni alloy exhibited higher corrosion resistance than Cr-Co alloys in in vitro tests.
本研究旨在评估重复烤瓷烧制过程对牙科合金腐蚀速率的影响。
本研究使用了 Cr-Co、Cr-Ni 和 Pd-Ag 合金。每种金属烤瓷体由 30 个试件组成，其中 7、9 和 11 次烧制各 10 个。用丙烷-氧气火焰熔化合金，用离心铸造机制备直径 10mm、厚度 3mm 的圆盘状试件，然后将烤瓷层烧附在金属合金上。将每个合金（重复烤瓷烧制后）的腐蚀试验在富山人工唾液溶液（pH=5）中进行五次重复，在低热膨胀硼硅酸盐玻璃电池中进行。采用 Tamhane 和 Sheffe 检验比较重复烧制后和每种合金 7、9 和 11 次烧制的结果之间的腐蚀差异。统计显著性概率水平设定为α=0.05。
商业 7 次烧制的合金（Commercial）的耐腐蚀性更高（30 mV）。另一方面，11 次烧制的合金（5 mV）的耐腐蚀性较低（P<.05）。
重复烧制降低了 Pd-Ag、Cr-Co 和 Cr-Ni 合金的耐腐蚀性能。Pd-Ag 合金在体外测试中表现出较小的腐蚀。Cr-Ni 合金在体外测试中比 Cr-Co 合金具有更高的耐腐蚀性。
