Document Detail

Brushing-induced surface roughness of nickel-, palladium-, and gold-based dental casting alloys.
MedLine Citation:
PMID:  18514667     Owner:  NLM     Status:  MEDLINE    
STATEMENT OF PROBLEM: Alloys with high nickel content have been increasingly used for dental prostheses. These alloys have excellent hardness, elastic modulus, and strength, yet have high corrosion rates when exposed to chemical or physical forces that are common intraorally. PURPOSE: The purpose of the current study was to measure the susceptibility of several types of nickel-based alloys to brushing abrasion relative to gold- and palladium-based alloys. MATERIAL AND METHODS: Au-Pt, Au-Pd, Pd-Ag, Ni-Cr, and Ni-Cr-Be dental alloys were brushed with a toothbrush (Oral-B Soft) and toothpaste (Ultrabrite) in a linear brushing machine, then the surface roughness was measured by profilometry (R(a), R(v), R(p)). Specimens (n=4) were brushed for 48 hours in a saline solution (pH 7). The effect of brushing was determined using 2-sided t tests (alpha=.05), and roughness among alloys postbrushing was compared using 1-way ANOVA with Tukey post hoc analyses (alpha=.05). RESULTS: All polished alloy surfaces (before brushing) had roughnesses of <or=0.1 microm (R(a)). The Pd-Ag alloy was the most resistant to brushing. The Ni-Cr-Be alloy abraded the most, with a postbrushing surface roughness of >1 microm (R(a)). Ni-Cr alloys without Be had a postbrushing surface roughness of 0.25 microm (R(a)). Postbrushing roughness of all other alloys ranged from 0.1-0.25 microm (R(a)). R(v) and R(p) values behaved similarly to R(a) values for all alloys. CONCLUSIONS: Although they have many excellent mechanical properties, Ni-Cr-Be alloys may be prone to degradation from brushing.
John C Wataha; Petra E Lockwood; Regina L W Messer; Jill B Lewis; Donald J Mettenburg
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The Journal of prosthetic dentistry     Volume:  99     ISSN:  0022-3913     ISO Abbreviation:  J Prosthet Dent     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-06-02     Completed Date:  2008-10-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376364     Medline TA:  J Prosthet Dent     Country:  United States    
Other Details:
Languages:  eng     Pagination:  455-60     Citation Subset:  D; IM    
University of Washington School of Dentistry, D770B HSC, Box 357456, 1959 NE Pacific St, Seattle, WA 98195-7456, USA.
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MeSH Terms
Beryllium / chemistry
Chromium Alloys / chemistry
Dental Alloys / chemistry*
Dental Polishing
Gold Alloys / chemistry*
Materials Testing
Nickel / chemistry*
Palladium / chemistry*
Sodium Chloride / chemistry
Stress, Mechanical
Surface Properties
Time Factors
Toothbrushing / instrumentation*
Toothpaste / chemistry
Reg. No./Substance:
0/Chromium Alloys; 0/Dental Alloys; 0/Gold Alloys; 0/Toothpaste; 7440-02-0/Nickel; 7440-05-3/Palladium; 7440-41-7/Beryllium; 7647-14-5/Sodium Chloride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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