Dental metals

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  • Since their first introduction, metallic biomaterials have always been designed to be corrosion resistant. For decades, this paradigm has become the mainframe of the biomaterials world. It has been cited in thousands of scientific papers and taught in hundreds of courses of materials for biomedical devices. It has also been followed by industries in developing millions of medical devices until today. Nowadays, with the advent of tissue engineering, biomaterials are envisaged to actively interact with the body.

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  • Metals are used as biomaterials due to their excellent electrical and thermal conductivity and mechanical properties. Since some electrons are independent in metals, they can quickly transfer an electric charge and thermal energy. The mobile free electrons act as the binding force to hold the positive metal ions together. This attraction is strong, as evidenced by the closely packed atomic arrangement resulting in high specific gravity and high melting points of most metals.

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  • The task of providing a reliable replacement for anatomic loss falls short of the original biology in both elegance and durability. Although prosthetic replacements are poor substitutes for healthy biology, disease and destruc- tion leave clinicians few alternatives. Teeth and their prosthetic replacement typify this dilemma. The healthy tooth is a thing to be admired – strong, compliant, chemically resistant, and even beautiful.

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  • Stains caused by dental materials are not uncommon (Figure 7-6).Among the discolorants found in dental materials, metallic ions are considered to be the most difficult to bleach.The metallic corrosion products may lead to a dark gray or black appearance that will be visible through the remaining tooth structure, including the root structure (Figures 7-12 and 7-13).The severity of discoloration and the success of bleaching depend upon the amount of metallic ions penetrating the dentinal tubules.

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  • Introduction For the last 50 years, bisphenol A (BPA – CAS Nọ 80-05-7) is a chemical used primarily to make polycarbonate plastic and epoxy resins. Polycarbonate plastic possesses a unique balance of toughness, optical clarity, high heat resistance, and excellent electrical resistance and has many industrial uses including media products (eg., CDs, DVDs), electronic equipments, sport equipments, bicycle helmets, food containers, drink containers, baby bottles, medical devices and many other products.

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