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学科主题: 口腔医学
题名:
Fatigue cyclic loading test of an auro-galvanoforming ceramic bridge
作者: Zhang Xiang-hao1; Sun Feng1; Wang Huan1; Xu Man-qiong2
关键词: dental occlusion ; dental prosthesis ; cementation
刊名: CHINESE MEDICAL JOURNAL
发表日期: 2008-10-05
卷: 121, 期:19, 页:1896-1899
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Medicine, General & Internal
研究领域[WOS]: General & Internal Medicine
关键词[WOS]: FRACTURE-RESISTANCE ; CASTING ALLOYS ; CROWNS ; RESTORATIONS ; STRENGTH ; DESIGN ; NICKEL
英文摘要:

Background In dental clinics, dentition defects are commonly restored with conventional porcelain-fused-to-metal fixed bridges. However, Ni-Cr alloy ceramic fixed bridges are known to have several drawbacks such as marginal coloration of the neck, low casting precision and, most seriously, poor biocompatibility. These problems could be circumvented by using noble metal ceramic bridges; however, one negative issue related to the conventional noble metal ceramic bridges is its high price due to the use of a large amount of gold for pontic. Therefore, an auro-galvanoforming ceramic bridge would be ideal to retain the advantages of a conventional material, yet reduce the amount of noble metal used. This study aimed to investigate whether any destructive changes occur to the auro-galvanoforming ceramic bridge under a fatigue cyclic loading test.

Methods On standard models which the left maxillary first premolar is lost and with the cuspid teeth and the second premolar as the fixed bridge abutment teeth, six maxillary auro-galvanoforming ceramic bridges and six corresponding nichrome ceramic jointed crowns were made as group A, six nichrome ceramic bridges and six corresponding nichrome ceramic jointed crowns were made as group B (control group). And then all specimens were fixed and tested on a fatigue cyclic loading machine; the changes occurring to the surfaces of occlusal contact with large functional area and to the porcelain-metal interfaces of the nichrome primary copings margins were observed through a scanning electron microscope (SEM).

Results In 120 hours′ continual observation, none of the specimens had porcelain coating fractures or scraping occurrence and all of the porcelain coatings had been kept intact under sinusoidal cyclic loading with the load range of 120-200 N and frequency of 5 Hz.

Conclusions Auro-galvanoforming ceramic bridges exhibited excellent fatigue strength in the fatigue cyclic loading test and may satisfy the clinical demand in theory, while the practical application shall be evaluated by observations in long-term clinical usage.

语种: 英语
所属项目编号: Z0005190041491
项目资助者: Beijing Science and Technology Committee Funds
WOS记录号: WOS:000261200500008
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.bjmu.edu.cn/handle/400002259/64685
Appears in Collections:北京大学口腔医学院_期刊论文

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作者单位: 1.Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China
2.Peking Univ, Sch Stomatol, Outpatient Dent Ctr, Beijing 100034, Peoples R China

Recommended Citation:
Zhang Xiang-hao,Sun Feng,Wang Huan,et al. Fatigue cyclic loading test of an auro-galvanoforming ceramic bridge[J]. CHINESE MEDICAL JOURNAL,2008,121(19):1896-1899.
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