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Surface Hardness in Biomaterials

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Questions and Answers

What is the importance of surface hardness in biomaterials?

Leads to premature failure due to fatigue.

Indicative of the ease of finishing and polishing. (correct)

Reduces the resistance to staining and bacterial plaque adhesion.

Enhances the flexibility of the material.

Which type of hardness test uses small diamond pyramid as an indenter?

Micro-hardness tests (micro-Vickers, Knoop). (correct)

Macro-hardness tests (Rockwell, Brinell, Vickers).

Nano-hardness tests.

No type of hardness test uses a small diamond pyramid as an indenter.

What is the principle of any hardness test method?

Using a chemical reagent to determine the hardness.

Measuring the weight of the sample.

Applying heat to the sample and observing the melting point.

Forcing an indenter into the sample surface followed by measuring dimensions of the indentation. (correct)

What is the range of indenting forces in macro-hardness tests?

<p>50N to 30000N.</p> Signup and view all the answers

What does nano-hardness test use to measure hardness?

<p>Minor loads of about 1 nano-Newton followed by precise measuring depth of indentation.</p> Signup and view all the answers

Study Notes

Importance of Surface Hardness in Biomaterials

Surface hardness is crucial in biomaterials as it affects the wear resistance, corrosion resistance, and biocompatibility of the material.

Hardness Tests

The Vickers hardness test uses a small diamond pyramid as an indenter.
The principle of any hardness test method is to measure the resistance of a material to plastic deformation.

Hardness Test Methods

Macro-hardness tests typically use an indenting force range of 1-3000 N (Newtons).
Nano-hardness tests use a sharp indenter tip and a very small force (in the range of millinewtons) to measure hardness.
Nano-hardness tests use the depth of indentation to measure hardness, allowing for the analysis of surfaces at the nanoscale.

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Description

Test your knowledge on the importance of surface hardness in biomaterials, its impact on finishing, polishing, fatigue strength, and resistance to staining and bacterial plaque adhesion.