납착법과 레이저융합법이 치과용 합금의 부식에 미치는 영향

백진; 최대균; 최부병; 우이형

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납착법과 레이저융합법이 치과용 합금의 부식에 미치는 영향
The effect of solder and laser weld on corrosion of dental alloys

대한치과보철학회지 2005년 43권 2호 p.264 ~ 279

백진, 최대균, 최부병, 우이형,

소속 상세정보

백진 ( Baik Jin ) - 경희대학교 치과대학 치과보철학교실
최대균 ( Choi Dae-Gyun ) - 경희대학교 치과대학 치과보철학교실
최부병 ( Choi Boo-Byung ) - 경희대학교 치과대학 치과보철학교실
우이형 ( Woo Yi-Hyung ) - 경희대학교 치과대학 치과보철학교실

KMID : 0362420050430020264

Abstract

Statement of problem: Intraoral corrosion not only affects the esthetic and function of metallic dental restoration, but also has biologic consequences as well. Therefore, corrosion is considered a primary factor when choosing the dental alloy and laboratory technique.

Purpose: The objective of this study was to compare the effects of solder and laser weld on corrosion.

Materials & Methods: Test specimens were made of 2 types of gold alloys, Co-Cr and Ni-Cr alloy and fabricated 3 methods, respectively: as cast, solder, and laser weld. For the analysis of corroding properties, potentiodynamic polarization test and immersion test conducted. The potentiodynamic polarization scan curve were recorded in 0.9% NaCl solution(pH 7) using Potentiostat/Galvanostat Model 273A. All specimens were exposed to 0.9% NaCl solution(pH 2.3) during 14 days. Elemental release into corrosive solution was measured by atomic emission spectrometry. Differences in corrosion potential and mass release were determined using ANOVA.

Results & Conclusion: Through analyses of the data, following results were obtained. 1. In Pontor MPF and Wiron 99, corrosion potential of the solder group was statistically lower than as cast and laser weld group(p<0.05), but there was no difference between corrosion potential of solder group and laser weld group in Pontor MPF and no differences between as cast and laser weld group(p>0.05). In Jel-Bios 10 and Wirobond, there was no difference of corrosion potential according to joining methods(p>0.05). 2. In all tested alloys, the amount of released metallic ion was greatest in the solder group(p<0.05). There was no difference between as cast group and laser weld group in Jel-Bios 10 and Wirobond(p>0.05). 3. In scanning electron microscopic examination, except soldered Wiron 99 specimens, it is impossible to discriminate the corrosive property of solder and laser weld. 4. Under the this experimental circumstances, laser weld appears superior to the solder when corrosion is considered.