Enhanced ingrowth of porous‐coated CoCr implants plasma‐sprayed with tricalcium phosphate

Chae, John C.; Collier, John; Mayor, Michael B.; Surprenant, Victor A.; Dauphinais, L A

doi:10.1002/jbm.820260109

Cited by 41 publications

(13 citation statements)

References 15 publications

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“…Coatings of hydroxyapatite (HA) fabricated by plasma spraying have been extensively investigated, [4][5][6] although there are several critical problems associated with the degradation of HA due to the elevated temperature required in the process, and lack of strength at the metal/HA interface. [7][8][9] An alternative method is to coat the implant with a bioactive glass (able to form HA in vivo) that could provide the desired interfacial attachment to the bone.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Bioactive Glass Coatings on Co-Cr Implant Alloys

et al. 2004

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ASilicate glass coatings on Vitallium Ò , a Co-Cr alloy were prepared using a simple enameling technique. The composition of the glasses in the SiO 2 -Na 2 O-K 2 O-MgO-CaO-P 2 O 5 system has been tailored to match the thermal expansion of the alloys. The optimum glass composition and firing conditions (temperature and time) needed to fabricate homogeneous coatings with good adhesion to the alloy were determined. The final coating thickness ranged between 40 and 60 mm. Coatings fired under the optimum conditions do not delaminate during indentation tests of adhesion. Excellent adhesion to the alloy has been achieved through the formation of 150 nm thick interfacial layers (CrOx). The silicate glass can be successfully coated to Co-Cr alloy and formed hydroxyapatite on the glass surface when immersed in a simulated body fluid (SBF) for 30 days.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Bioactive Glass Coatings on Co-Cr Implant Alloys

et al. 2004

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“…[1][2][3] Moreover, clinical dissatisfaction with (poly)methylmethacrylate (PMMA) bone cement also has led to an increasing use of implants with porous coatings to anchor total joint prostheses. [4][5][6] In this work, graded porous titanium coatings on titanium substrates were prepared by plasma spraying in an argon atmosphere to improve biological fixation via osseous ingrowth.…”

Section: Introductionmentioning

confidence: 99%

Preparation of graded porous titanium coatings on titanium implant materials by plasma spraying

Yang

Tian

Chen

et al. 2000

J. Biomed. Mater. Res.

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Graded porous titanium coatings have been deposited on titanium substrates for dental implants by plasma spraying in an argon atmosphere. X-ray diffraction (XRD), scanning electron microscopy (SEM), surface roughness measurement, and tensile strength tests were performed on graded porous coatings. The results showed that Ti(3)O(5) was formed in the outermost surface of the porous coatings due to oxidation. The graded porous coatings consisted of three layers. The outer layer was full of macropores with a surface roughness of approximately 100 microm. The diameter of many macropores reached and even surpassed 150 microm, which could be beneficial for tissue to grow into the coating. The middle layer consisted of a mixture of micropores and macropores. The inner layer was a very dense and tight interface layer that included mechanical, physical, and metallurgical bonding. In tensile strength tests, testing bars peeled off the coatings, because the adhesive agent fractured, but the coatings remained intact.

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“…Significantly greater attachment strength was reported for the TCP-coated implants (2.75 MPa) after 4 weeks of implantation compared to the uncoated controls (2.22 MPa). In a study by Chae et al [29], TCP-coated porous CoCrMo intramedullary implant rods were prepared in rabbits. Similar pullout force was reported between TCP-coated (307 N) and uncoated specimens (324.7 N) at 12 weeks.…”

Section: Discussionmentioning

confidence: 99%

Mechanical and histological evaluations of cobalt-chromium alloy and hydroxyapatite plasma-sprayed coatings in bone

Yang

Wang

Chang

et al. 1996

J Mater Sci: Mater Med

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This study evaluated the mechanical and histological behavior of cobalt-chromium (CoCr) alloy and hydroxyapatite (HA) plasma-sprayed coatings in canine cortical bone after 6 and 12 weeks of implantation, using CoCr alloy as the substrate. The substrate was bond-coated with microtextured CoCr alloy coating to ensure adherence between the substrate and top coats. A macrotextured CoCr alloy top coat with surface roughness Ra =34.25 _+ 5.50 I~m was produced to create suitable pores ranging from 25 t~m to 200 I~m for bone ingrowth. For HA top coat, a relatively smooth surface (Ra= 15.14+3.21 gm) was prepared for bone apposition. Shear testing of bone/implant interfaces showed that the CoCr alloy top coat exhibited significantly lower (p < 0.01) mean shear strength than the HA top coat at each time interval. The maximum shear strength was 10.884-0.38 MPa for HA-coated implants 12 weeks post-implantation. After histological evaluations, substantial differences in the extent of new bone formation and the types of implant/bone contact were found between two kinds of implants. Direct bone-to-HA coating contact was consistently observed, while a layer of fibrous tissue intervening at the bone CoCr alloy coating interface was found. Occasionally, partial dissolution of HA coating was seen after 12 weeks of implantation. The results of this study suggested that plasma-sprayed macrotextured CoCr coatings may not be an effective alternative for biological fixation.

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Enhanced ingrowth of porous‐coated CoCr implants plasma‐sprayed with tricalcium phosphate

Cited by 41 publications

References 15 publications

Fabrication and Characterization of Bioactive Glass Coatings on Co-Cr Implant Alloys

Fabrication and Characterization of Bioactive Glass Coatings on Co-Cr Implant Alloys

Preparation of graded porous titanium coatings on titanium implant materials by plasma spraying

Mechanical and histological evaluations of cobalt-chromium alloy and hydroxyapatite plasma-sprayed coatings in bone

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