摘要
目的:探讨人工唾液和氟化物对钴铬合金卡环疲劳强度及粗糙度的影响。方法:用成品卡环蜡型制作钴铬合金卡环60个,分为6组,分别在空气中、人工唾液和氟化物中进行测试,初始载荷强度和疲劳失效前的载荷循环次数被自动记录;疲劳裂纹和表面形貌进行扫描电镜分析。用精密粗糙度测量仪检测各组表面粗糙度。结果:钴铬合金卡环在不同测试条件下的疲劳强度及粗糙度有差异。统计分析表明,pH5.6NaF处理组与对照组的循环载荷次数有显著性差异(P<0.01)。pH5.6NaF处理组在处理前后的粗糙度有显著性差异(P<0.01)。结论:人工唾液和氟化物会使钴铬合金卡环的疲劳强度下降,而表面粗糙度升高。
Objective： To study the effect of artificial saliva and intraoral fluoride on the fatigue strength and roughness values of cobalt-chromium alloy clasp. Methods： Sixty casting clasp specimens of cobalt-chromium al- loys made from prefabricated wax were divided into 6 groups. Specimens were tested in air, artificial saliva and in- traoral fluoride. Initial loading force and loading cycle before fracture were registered automatically. The fatigue cor- rosion cracks and surface corrosion situation were observed by scanning electron microscopy （SEM）. Surface rough- ness values in different groups were measured by precision topographer. Results： The fatigue strength and rough- ness values of chromium--cobalt alloy were not different among six test conditions. StatistiCal analysis showed that there was significant difference between pH5.6NaF group and control group in loading cycle（P〈0.01）, pH5.6 NaF group had significant difference before and after processing the surface roughness （P〈0.01）. Conclusion： Both artificial saliva and intraoral fluoride reduced the fatigue strength of chromium-cobalt alloy, whereas, improved the roughness values.
出处
《口腔医学研究》
CAS
CSCD
北大核心
2011年第7期608-611,共4页
Journal of Oral Science Research
关键词
钴铬合金
疲劳强度
表面粗糙度
卡环
Cobalt--chromium alloy Fatigue strength Surface roughness Clasp
