Comparative study of circumferential clasp retention force for titanium and cobalt-chromium removable partial dentures
Comparative study of circumferential clasp retention force for titanium and cobalt-chromium removable partial dentures
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DOI：
10.1067/mpr.2002.128128
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发表时间：
2002-09-01
影响因子：
4.6
通讯作者：
Bezzon, OL
中科院分区：
文献类型：
--
作者：
Rodrigues, RCS;Ribeiro, RF;Bezzon, OL
陈述问题。人们对使用钛制造可摘局部义齿（RPD）框架的兴趣有所增加，但很少有研究支持其使用。目的。本研究的目的是通过测试插入/取出和X线检查铸件的缺陷，比较由商业纯钛制成的环形RPD卡环和由2种不同钴（Co）-铬（Cr）合金制成的相同卡环。材料和方法。在代表部分无牙下颌右半弓段的耐火铸件上，使用商业纯钛（n = 12）和2种钴铬合金（各n = 12）铸造36个框架，采用相同的预制模式和制造商指定的熔模和铸造技术。每组分为2个亚组，分别对应0.25 mm和0.50 mm底切。未进行抛光程序以确保均匀性。必要时，仅在放大镜下使用钨布尔斯钻头小心地去除结节和布尔斯。对样本进行X线照相，并进行模拟5年框架使用的插入/取出试验。资料经方差分析和Tukey互补余项检验（P
Statement of problem. The interest in using titanium to fabricate removable partial denture (RPD) frameworks has increased, but there are few studies to support its use.Purpose. The objective of this study was to compare circumferential RPD clasps made of commercially pure titanium and identical clasps made of 2 different cobalt (Co)-chromium (Cr) alloys by testing insertion/removal and radiographically inspecting the casts for defects.Material and methods. On refractory casts that represent a partially edentulous mandibular right hemi-arch segment, 36 frameworks were cast from commercially pure titanium (n = 12) and 2 Co-Cr alloys (n = 12 each) with identical prefabricated patterns and the manufacturer-designated investment and casting technique. Each group was divided into 2 subgroups, corresponding to .25-mm and .50-mm undercuts, respectively. No polishing procedures were performed to ensure uniformity. Only nodules and burs were carefully removed with tungsten burs under magnification when necessary. The specimens were radiographed and subjected to an insertion/removal test simulating 5 years of framework use. The data were subjected to analysis of variance and the Tukey complementary rest (P