Cobalt-chromium alloys

Cobalt—Chromium Alloys. Co—Cr and Ni—Cr alloys are used predominately for the casting of removable partial dentures fixed partial dentures (bridges), crowns, and inlays are also cast. Because of high hardness, corrosion resistance, and wear resistance cobalt-chromium alloys are used for bite adjustments and as serrated inserts in plastic teeth used in fliU dentures. These alloys are well tolerated by the body and also are used for dental implants and orthopedic implant alloys. [Pg.484]

Table 9 Hsts select properties of Co—Cr alloys. It is generally conceded that the casting shrinkage of the cobalt—chromium alloys is greater than that of the gold alloys. The lower density of the base metal alloys provides a weight advantage over the higher-density gold alloys in certain types of bulky restorations. Cobalt—chromium alloys have Knoop hardnesses of 310—415.

Wood, J. F. L. Mucosal Reaction to Cobalt Chromium Alloy British DentalJournal, 136, 423-424 (1974)... [Pg.467]

Stenberg, T. and Bergman, B. Release and Uptake of Cobalt from Cobalt-Chromium Alloy Implants , Acta Odontologia Scandanavia 41, 149-154 (1983)... [Pg.467]

Significant advances have also been made by forging titanium alloy (T1-6A1-4V) and cobalt chromium alloys cold working multiphase cobalt based alloys and by hot isostatically pressing cobalt chromium alloy powders. The property values claimed by the manufacturers are far in excess of the minimum values specified in the British, American and International Standards... [Pg.469]

The successful clinical use of titanium and cobalt-chromium alloy combinations has been reported Lucas etal. also investigated this combination using electrochemical studies based on mixed potential and protection potential theories. Verification of these studies was made by direct coupling experiments. The electrochemical studies predicted coupled corrosion potentials of -0.22 V and low coupled corrosion rates of 0.02 ft A/cm. Direct coupling experiments verified these results. The cobalt-titanium interfaces on the implants were macroscopically examined and no instances of extensive corrosion were found. Overall, the in-vitro corrosion studies and the examination of retrieved prostheses predicted no exaggerated in-vivo corrosion due to the coupling of these cobalt and titanium alloys. [Pg.479]

Earnshaw, R. (1960a). Investments for casting cobalt-chromium alloys. Part I. British Dental Journal, 108, 389-96. [Pg.269]

Titanium alloys generally show a combination of strength and biocompatibility which makes them suitable for medical devices (prosthesis, surgical instruments). The high strength Ti-6Al-7Nb alloy has several orthodontic applications. Only a limited number of alloys have the necessary combinations of properties needed for successful use in the human body. Titanium and its alloys, stainless steels and cobalt-chromium alloys are the workhorse alloys in the medical device industry. [Pg.402]

Cobalt-chromium alloy (see Chromium and chromium compounds) Cobalt-chromium-molybdenum alloys (see Cobalt and cobalt compounds) Cobalt metal powder (see Cobalt and eobalt compounds)... [Pg.539]

A spherically shaped ceramic or metal ball, often made of cobalt-chromium alloy,... [Pg.84]

Allen MJ, Myer BJ, Millett PJ, et al. 1997. The effects of particulate cobalt, chromium and cobalt-chromium alloy on human osteoblast-like cells in vitro. J Bone Jt Surg Am 79-B(3) 475-482. [Pg.400]

Michel R, Loer F, Nolte M, et al. 1987. Neutron activation analysis of human tissues, organs and body fluids to describe the interaction of orthopaedic implants made of cobalt-chromium alloy with the patients organisms. J Radioanal Nucl Chem 113(l) 83-96. [Pg.444]

E.M. Prosen, Refractory material suitable for use in casting dental investments, US Patent 2,209,404, 1941. R. Earnshaw, Investments for casting cobalt-chromium alloys, part 1, Br. Dent. J., 108 (1960) 389-396. [Pg.26]

Improved analytical techniques are needed to detect the important configurational and chemical diflFerences among adsorbed films formed spontaneously from complex solutions on various substrates. Internal refiection IR does not reveal significant diflFerences in the adsorbed protein films which accumulate on variously treated Stellite 21 devices (a cobalt-chromium alloy used to make synthetic heart valve struts and seats) in some instances these devices are thrombogenic, and in others they are apparently thromboresistant (39). Yet, scanning electron microscopy reveals that arriving blood platelets can discern diflFerences in the films immediately on contact with them. [Pg.14]

Most metallic biomaterials fall into one of four categories stainless steels, titanium and titanium-based alloys, cobalt-chromium alloys, and amalgams. Additionally, research is under way on a number of... [Pg.153]

Orthopedic Joint replacements (hip, knee) Bone plate for fracture fixation Bone cement Bony defect repair Artificial tendon and ligament Titanium, Ti-Al-V alloy, stainless steel, polyethylene Stainless steel, cobalt-chromium alloy Poly(methyl methacrylate) Hydroxyapatite Teflon, Dacron ... [Pg.154]

Variable metallic substrates possible, including cp-titanium, titanium alloys, cobalt-chromium alloys and stainless steel. [Pg.60]

Ducheyne, P. and Healy, K.E. (1988) The effect of plasma-sprayed calcium phosphate ceramic coatings on the metal ion release from porous titanium and cobalt-chromium alloys. J. Biomed. Mater. Res.,... [Pg.299]

Yang, C.Y., Wang, B.C., Chang, W.J., Chang, E., and Wu, J.D. (1996) Mechanical and histological evaluation of cobalt-chromium alloy and hydroxyapatite plasma-sprayed coatings in bone. J. Mater. Sci. Mater. [Pg.308]

Heath JC, Freeman MAMR and Swanson SAV (1971) Carcinogenic properties of wear particlesfrom prostheses made in cobalt-chromium alloy. Lancet i, 564-566. [Pg.387]

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