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

What is nidation, What is nidation? In which phase of the menstrual cycle d...

What is nidation? In which phase of the menstrual cycle does nidation occur? Nidation is the implantantion of the embryo in the uterus. Nidation happens around the 7th day afte

Which is plant tissues specialized in covering, Which is plant tissues spec...

Which is plant tissues specialized in covering? The dermal tissues or covering tissues of the plants are the epidermis (that covers the leaves and the young stems and shoots) a

Explain the behaviour of pteridophytes, Q. Why are pteridophytes better ada...

Q. Why are pteridophytes better adapted to dry land than bryophytes? Were pteridophytes always less abundant than phanerogamic plants? Although pteridophytes and bryophyt

What are trophic levels, What are trophic levels? How many trophic levels c...

What are trophic levels? How many trophic levels can a food chain have? The Trophic levels correspond to positions on a food chain. thus producers always belong to the first tr

Explain simple staining technique, Explain Simple Staining Technique? H...

Explain Simple Staining Technique? Here single staining agent is used to determine the size, shape and arrangement of bacterial cells. It is simple and easy to perform. Dried s

What are the grasslands of north america, What are the grasslands of North ...

What are the grasslands of North America and of South America respectively called? The steppe grasslands of North America are known as prairies. The grasslands of South America

What is the etiological agent of visceral leishmaniasis, Q. What is the eti...

Q. What is the etiological agent of visceral leishmaniasis? How the disease transmitted and what is are its typical manifestations? The Visceral leishmaniasis is caused by the

Acrodynamics, ACRODYNAM IC S Division of air in lungs. Measured by sp...

ACRODYNAM IC S Division of air in lungs. Measured by spirometer. 1. Tidal Air (T.A.): Quantity of air taken in or given out in a breath 500 cc. 2. Inspiratory Reserv

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