The elastic limit of nickel-containing and nickel-free cobalt-chromium circumferential clasp arms.
| Title: | The elastic limit of nickel-containing and nickel-free cobalt-chromium circumferential clasp arms. |
|---|---|
| Authors: | Essop AR; Department of Prosthetic Dentistry, School of Oral Health Sciences, University of the Witwatersrand, P.O. Wits, 2050, Johannesburg.; Sykes LM; Wolfaard JF; Chandler HD; Becker PJ |
| Source: | SADJ : journal of the South African Dental Association = tydskrif van die Suid-Afrikaanse Tandheelkundige Vereniging [SADJ] 2000 Oct; Vol. 55 (10), pp. 539-42. |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: South African Dental Association Country of Publication: South Africa NLM ID: 9812497 Publication Model: Print Cited Medium: Print ISSN: 1029-4864 (Print) Linking ISSN: 10294864 NLM ISO Abbreviation: SADJ |
| Imprint Name(s): | Original Publication: Houghton : South African Dental Association, [1998- |
| MeSH Terms: | Dental Clasps*; Chromium Alloys/*chemistry ; Nickel/*chemistry; Cobalt/chemistry ; Dental Casting Investment/chemistry ; Vitallium/chemistry ; Dental Prosthesis Design ; Dental Prosthesis Retention ; Elasticity ; Humans ; Materials Testing ; Multivariate Analysis ; Pliability ; Statistics as Topic ; Stress, Mechanical ; Surface Properties ; Tensile Strength |
| Abstract: | The purpose of this study was to compare the flexibility and rigidity of the retentive arms of cast circumferential clasps prepared from two nickel-containing alloys (Vitallium and Wironit) with a nickel-free alloy (Biosil). Standardised wax patterns were adapted to 30 specially prepared refractory casts. Ten of these waxed casts were sent to each of three commercial laboratories that specialize in making castings from each of the alloys to be tested. A tensile tester was used to test each one of the finished clasps for deflection at the elastic limit and for load at 0.5 mm deflection. An exploratory analysis of the data by means of a multivariate analysis of variance was followed by Fisher's least significant test that identified specific differences between test specimens. It was found that nickel-containing and nickel-free alloys were not significantly different in respect of flexibility and rigidity. |
| Substance Nomenclature: | 0 (Biosil); 0 (Chromium Alloys); 0 (Dental Casting Investment); 0 (Wironit); 12629-02-6 (Vitallium); 3G0H8C9362 (Cobalt); 7OV03QG267 (Nickel) |
| Entry Date(s): | Date Created: 20030301 Date Completed: 20030409 Latest Revision: 20131121 |
| Update Code: | 20260130 |
| PMID: | 12608215 |
| Database: | MEDLINE |
Journal Article