Use of metals and alloys in alloplastic implant materials, Biology

Assignment Help:

Metals and Alloys in alloplastic implant materials

Most of the dental implant systems are made of metals or their alloys. Currently commercially pure titanium and its alloy Ti-6Al-4V are most popular. Earlier alloys such as stainless steel, Tantulum, the Co-Cr alloys e.g. Co-Cr-Mo or Co-Cr-W-Ni were used. Of these, only the Co-Cr alloys with Mo are cast, the remainders are used in the form of prefabricated structures. Cobalt chromium alloys containing Berylium are not suitable for implantation as the ions of this metal cause an extremely toxic reaction into tissue.

Martensitic and Ferritic stainless steels are disregarded because of their magnetic property which is undesirable. Austenitic stainless steels are non-magnetic non heat- treatable steels, have excellent corrosion and heat resistance with good mechanical properties over a wide range of temperatures. Of these, the chromium-nickel steels are the most widely used steels and are also known as 18-8(Cr-Ni) steels. However, stainless steel undergoes more corrosion than Co-Cr alloys when embedded in  the tissues. Pitting, galvanic corrosion, crevicular and stress corrosion are all observedin metallic implants. This corrosion is enhanced by the piezoelectric properties of bone which causes the release of metallic ions into the surrounding tissue. A tissue reaction occurs when the ion concentration reaches a high value.

 


Related Discussions:- Use of metals and alloys in alloplastic implant materials

Eexplain importance of mitosis for the embryonic development, What is the i...

What is the importance of mitosis for the embryonic development? Every embryo grows from a single cell that suffers mitosis and operates other cells that also divide themselves

Describe aortic regurgitation murmur in chronic ar murmur, Describe Aortic ...

Describe Aortic Regurgitation Murmur in Chronic AR Murmur ? Characteristic: High pitched, decrescendo murmur, immediately after S2 and extending through and part or all of dias

Advantages and disadvantages of measurement of cell mass, Define Advantages...

Define Advantages and Disadvantages of Measurement of Cell Mass? Advantage 1. It is a useful technique for estimating fungal and actinomycetes growth. Disadvantages 1.

Hypocoagulation disorder and vitamin k deficiency, Which of the following p...

Which of the following patients likely faces the highest risk of an acquired hypocoagulation disorder and vitamin K deficiency? Answer A. A patient who is immunocompromised as a re

Determine the strengths of full battery measures, Determine the Strengths o...

Determine the Strengths of Full Battery Measures 1) Wide range of scores allow differential diagnosis in various cognitive disorders 2) More reliable, and sensitive 3) Br

Acid hydrolysis of non-reducing sugar, Q. Acid Hydrolysis of Non-Reducing S...

Q. Acid Hydrolysis of Non-Reducing Sugar? It involves the acid hydrolysis of non-reducing sugars to reducing sugars. It is also known as the process of inversion. Acid hydrolys

What is sex-linked traits in genetics, What is Sex-linked Traits in genetic...

What is Sex-linked Traits in genetics? The X-chromosomes carry genes for traits other than sex characteristics. Morgan discovered these sex-linked traits while observing the in

How were the classification systems of aristotle, How were the classificati...

How were the classification systems of Aristotle and Linnaeus similar?  Both systems divided all living things into two major groups, animals and plants, but Aristotle's system

Define the starch gel electrophoresis, Define the Starch gel electrophoresi...

Define the Starch gel electrophoresis? Starch gel has the advantage of fine texture and absence of protein adsorption with a molecular sieving effect retarding proteins of larg

Show the recessive phenotype, A woman who is heterozygous for a particular ...

A woman who is heterozygous for a particular X-linked recessive trait marries a phenotypically normal man. What percentage of their sons will show the recessive phenotype?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd