Corrosion fatigue of high-copper dental amalgams

Given its remarkable properties, dental amalgam is still a favorable dental material. These alloys are produced in different varieties of chemical compositions and morphologies, such as lath-cut and spherical. However, the best mechanical and clinical properties have been observed in high-copper, no...

Full description

Saved in:
Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2007-08, Vol.63 (8), p.799-806
Main Authors: AGAZADEH MOHANDESI, J, MAJIDI, B, BEYGI KHERADMAND, A
Format: Article
Language:English
Subjects:
Acetic acid
Amalgams
Applied sciences
Chemical composition
Computer simulation
Copper
Corrosion
Corrosion environments
Corrosion fatigue
Dental alloys
Dental amalgams
Dental materials
Dental restorative materials
Environmental effects
Exact sciences and technology
Fatigue
Fatigue failure
Fatigue life
Fatigue strength
Finite element method
Gamma-2 phase (crystals)
Heat treating
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microcracks
Microstructure
Morphology
Physiology
Properties
Restoration
Serum
Strength
Zinc
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Given its remarkable properties, dental amalgam is still a favorable dental material. These alloys are produced in different varieties of chemical compositions and morphologies, such as lath-cut and spherical. However, the best mechanical and clinical properties have been observed in high-copper, non-zinc amalgams with disperse spherical particles. This is due to the absence of a weak γ2 phase in the microstructure. In the present work, fatigue behavior of three high-copper amalgams in air, physiological serum, and acetic acid (CH3COOH) environments under the loading frequency of 10 Hz have been investigated. Two of the amalgams are in the form of lath-cut and the other one is in the form of spherical particles. Results showed that the fatigue strength of spherical particle amalgams is more than that of lath-cut amalgams. Maximum and minimum fatigue strength were observed in acetic acid and physiological serum solutions, respectively. It seems that high fatigue strength of these amalgams in an acetic acid environment corresponds to the polishing effect of this solution (i.e., eliminating surface microcracks). Finally, fatigue lives of two classes of amalgam restorations (classes I and II) have been simulated using the finite element method. Results showed that the fatigue strength of class I restoration is higher than class II, and the contribution of fatigue damage on the failure of amalgam in class II restorations is more pronounced.
ISSN:0010-9312
1938-159X
DOI:10.5006/1.3278429