Dentistry. Determination of the strength of dental amalgam by the Hertzian indentation strength (HIT) method

2016 ◽  
Keyword(s):  
Dental Amalgam ◽  
Hertzian Indentation

Analytic Procedures for Determination of Silver, Tin, Mercury, Copper, and Zinc in Dental Amalgams

1971 ◽  
Vol 50 (2) ◽  
pp. 378-381 ◽  
Author(s):  
Thomas A. Kendall ◽  
Glenda H. Sohl ◽  
Richard S. Mateer
Keyword(s):  
Weight Loss ◽  
Weight Gain ◽  
Qualitative Analysis ◽  
Dental Amalgam ◽  
X Ray ◽  
Gravimetric Determination ◽  
Copper And Zinc ◽  
Dental Amalgams

Previous analytic procedures for dental amalgam alloys were simplified and improved in accuracy. Qualitative analysis was conducted by X-ray spectroscopy. Hg was determined quantitatively by weight loss in flowing argon distillation; Sn by gravimetric SnO2 and Ag as AgCl; Cu by weight gain on electrolysis; and Zn by gravimetric determination as ZnO.

Qualitative and quantitative determination of dental amalgam restoration volume

1999 ◽  
Vol 82 (1) ◽  
pp. 8-14 ◽  
Author(s):  
David A. Covey ◽  
Dennis K. Kent ◽  
David G. Dunning ◽  
Sreenivas Koka
Keyword(s):  
Quantitative Determination ◽  
Dental Amalgam ◽  
Qualitative And Quantitative ◽  
Amalgam Restoration

Colorimetric determination of gamma 2 phase in dental amalgam

1980 ◽  
Vol 43 (1) ◽  
pp. 50-51 ◽  
Author(s):  
W.H. Bowles ◽  
R.K. Farrar ◽  
R.L. Kienholz
Keyword(s):  
Dental Amalgam ◽  
Colorimetric Determination

Determination of Fracture Toughness and Fracture Probability of LPS Aluminas by Hertzian Indentation

2005 ◽  
Vol 290 ◽  
pp. 308-311
Author(s):  
Dušan Galusek ◽  
Frank L. Riley ◽  
Marek Liška
Keyword(s):  
Fracture Toughness ◽  
Fracture Behaviour ◽  
Statistical Correlation ◽  
Fracture Probability ◽  
Surface Fracture ◽  
Hertzian Indentation ◽  
Probability Of Fracture ◽  
Varied Composition ◽  
Cumulative Probabilities

The Hertzian indentation technique has been evaluated as a possible means of assessing the surface fracture behaviour of a set of qualitatively similar liquid phase sintered polycrystalline aluminas with systematically varied composition, and a range of grain sizes. The method provides a better correlation between microstructure characteristics and surface fracture behaviour than does Vickers indentation. The fracture toughness determined from Hertzian indentations was found to be a function of grain size, irrespective of the composition of the material. The cumulative probabilities of formation of ring cracks at specific loads during indentation with a spherical indenter were determined for each material from the set of 25 measurements, and the parameters of distribution of the probability of fracture were calculated. A statistical correlation between the failure probability distribution and the size distribution of alumina grains was detected.

Combined empirical–analytical method for determining contact radius and indenter displacement during Hertzian indentation on coating/substrate systems

2004 ◽  
Vol 19 (9) ◽  
pp. 2774-2781 ◽  
Author(s):  
Chun-Hway Hsueh ◽  
Pedro Miranda
Keyword(s):  
Finite Element ◽  
Analytical Method ◽  
Empirical Equation ◽  
Contact Radius ◽  
Finite Element Analyses ◽  
Modulus Ratio ◽  
Properties Of Coatings ◽  
Hertzian Indentation ◽  
Potential Applications

An analytical model was developed in a previous work to relate the normalized indenter displacement to both the coating-to-substrate Young's modulus ratio and the coating-thickness-to-contact-radius ratio for Hertzian indentation on coating/substrate systems. However, application of this model is contingent upon the determination of the contact radius during indentation. Using the data from finite element analyses, an empirical equation is proposed in this paper to determine the normalized contact radius. Combining this empirical equation with the previous analytical equation, both the contact radius and the indenter displacement for Hertzian indentation on coating/substrate systems are predicted. The predictions obtained by this combined empirical–analytical method are shown to agree with the finite element results in general although the indenter displacement is over-estimated when the coating is stiffer than the substrate. Finally, the potential applications of this method to determine the elastic properties of coatings from the indentation data are envisaged.

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