两种卡环作用于钴铬金属冠的固位力衰减及冠表面磨损研究  

Retention force attenuation of 2 kinds of clasps and surface abrasion of the Cr-Co crowns

作　　者：兰旭[1] 杨瑛[2] 杨秋霞[2] 

机构地区：[1]赣州市人民医院,341000 [2]南昌大学附属口腔医院

出　　处：《实用口腔医学杂志》2014年第2期165-168,共4页Journal of Practical Stomatology

摘　　要：目的:观察2种不同材料的T型卡环固位力衰减趋势和钴铬金属铸造冠相应表面磨损状况。方法:制作钴铬金属铸造冠、钴铬合金T型卡环和Vitallium2000 T型卡环的标准试件。分别在0.5 mm倒凹、0.25 mm倒凹及有无唾液浸泡条件下采用instron测试仪进行1 800次反复脱位和就位实验(疲劳实验)。记录卡环最大脱位力的衰减曲线,并用电子显微镜观察钴铬金属铸造冠表面磨损的情况。结果:所有卡环固位力衰减的规律基本符合对数曲线,电镜下可见在相同实验条件下,实验后Vitallium2000 T型卡环对钴铬金属铸造冠的磨损小于钴铬合金T型卡环。Vitallium2000 T型卡环的固位力保持优于钴铬合金T型卡环。结论:Vitallium2000 T型卡环与钴铬合金T型卡环相比固位力衰减小,对钴铬合金冠磨损小。Objective：To investigate the the retention force changes of 2 kinds of T bar clasps on Cr-Co crowns and the surface ab-rasion of the crowns.Methods：Standard Cr-Co crowns were made,and standard T bar clasps were made of Cr-Co alloy and Vitalli-um2000 with 0.25 mm and 0.5 mm undercut depth respectively.1 800 times repeated placement and removal（fatigue test）were car-ried out on instron testing machine in or without saliva soak condition.The attenuation curves of the maximum retention force was an-alysed.The surface abrasion of the crowns was observed before and after the fatigue test by SEM.Results：The retention force attenu-ation of the clasps in every group was accord with the logarithm attenuation law.SEMexamination showed that in the same condition, there was less surface abrasion in Vitallium2000 group than that in Cr-Co group.Vitallium2000 clasp was superior to Cr-Co clasp in maintaining the retention force.Conclusion：Vitallium2000 T bar clasp may provide better retention force with less furface abrasion on Cr-Co crown than Cr-Co clasp.

关 键 词：T型卡环 铸造金属冠 固位力 磨损 

分 类 号：R783.1[医药卫生—口腔医学]