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

Periphyton - aquatic ecosystem, Periphyton - Aquatic Ecosystem These a...

Periphyton - Aquatic Ecosystem These are organisms which remain attached or clinging to stems and leaves of rooted plants or substances emerging above the bottom mud. Usually

What is nuclear pollution, What is nuclear pollution? Nuclear pollution...

What is nuclear pollution? Nuclear pollution having of radiations emitted from atomic nuclei, these radiations is highly injurious to living beings. They can be originated from

Nutrient availability, Nutrient Availability You have seen that cation ...

Nutrient Availability You have seen that cation exchange plays an important part in nutrient availability to plants. Cation exchange functions in two ways as nutrients are rele

Explain the food applications of gum arabic, Explain the Food Applications ...

Explain the Food Applications of Gum Arabic A major use for gum Arabic is in the confectionery industry where it has two important functions; to retard or to prevent crysta

What are the penetrance and the expressivity of a gene, What are the penetr...

What are the penetrance and the expressivity of a gene? The Individuals that carry a same genotype don't always manifest in an identical manner the correspondent phenotype. The

What is the function of the umbilical cord, What is the function of the umb...

What is the function of the umbilical cord? The umbilical cord is a set of blood vessels that connects the fetus with the placenta. In the fetus one extremity of the cord inse

Formation of female gametes, Formation of female gametes: Ovule deve...

Formation of female gametes: Ovule develops from a cushion like part of the ovary called the PLACENTA. Ovule is connected to the placenta by a stalk known as FUNICLE. The

Explian anthropometric measures, Explian Anthropometric measures Anthr...

Explian Anthropometric measures Anthropometric measures : It measures growth  in  children  and  shows changes  in weight  in  all populations  that  call reflect  diseases an

Phimosis, Phimosis Phimosis may be congenital or acquired. The foreski...

Phimosis Phimosis may be congenital or acquired. The foreskin in young infants cannot be retracted, because at that gge it is adherent to the underlying glans. Wlen an attemp

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