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7. Royal Academy of Medicine in Ireland Section of Bioengineering

Author

Lee, T. C., Shine, J. D., FitzPatrick, D. P., Bradley, J. A., O’Connor, J. J., O’Kelly, K. U., Carr, A. J., McCormack, B. A. O., O’Neill, P., Cole, J. S., Watterson, J. K., Raghunathan, S., O’Reilly, M. J. G., Pherwani, A., Rice, J., McCormack, D., Maher, S. A., Prendergast, P. J., Reid, A. J., Waide, D. V., Chambers, S. D., Bartlett, R. H., Ceccio, S. L., Murphy, L. A., Lacroix, D., Murphy, B. P., Mullett, H., Shannon, F., Lawlor, G., O’Rourke, S. K., Connolly, P., Maher, S., Devitt, A., McElwain, J., O’Reilly, P., McCarthy, D. R., Kernohan, G., Buchanan, F. J., Sim, B., Downes, S., Bennett, D. B., Orr, J. F., Dorrell, P. F., Fleming, P., Stephens, M., Moholkar, K., Fenelon, G., Doyle, A. M., Dockrell, S., Normoyle, P., Geraghty, D., MacNamara, S., Lacey, G., Lally, C., McGloughlin, T., Grace, P., Walsh, M., McGIoughlin, T., Colgan, D., Daly, S., Dolan, B., Flynn, M. J., Shuhaibar, M., Neligan, M. C., McMillan, N. D., O’Mongain, E., Walsh, J., Miller, R., Mitchell, I., O’Neill, M., Brennan, F., Ridgway, P., Blayney, A. W., Monkhouse, W. S., O’Brien, F. J., Taylor, D., Mushipe, M. T., Shelton, J. C., Revell, P. A., McCarthy, M. A., Pearse, K. M., O’Keefe, D. T., Lyons, G. M., Leane, G. E., Mulcahy, E., Bray, K., Conway, B. A., Halliday, D. M., Rosenberg, J. R., Anderson, R., Grace, P. A., Kinsella, S. M., Harrison, A. J., Lyons, D. J., Wallace, K. E., Hill, R. G., Pembroke, J. T., Brown, C. J., Hatton, P. V., Bryan, K., Buggy, M., Noe, J. M., Nico, A. C., McConnell, L. A., McGivern, R. C., Marsh, D. R., Meenan, B. J., Workman, A., and Kuiper, J. H.

Published
1999
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8. Royal academy of medicine in Ireland section of bioengineering: Proceedings of meeting held in Blessington, Co. Wicklow on 24th–25th January, 1997

Author

Prendergast, P. J., Callanan, I., Simms, C., Lyons, C. G., Brady, C. L., Feeney, M. S., Lennon, D., Curley, L. J., McCormack, B. A. O., O’Brien, T. M., Waide, V., McCormack, B. A. O., Carr, A. J., Ferris, P., Rice, H. J., Prendergast, P. J., Blayney, A. W., Tierney, S., Buckley, D., Bonnadio, F., Fitzpatrick, J. M., Gorey, T. F., Donnelly, P. G., Wright, G. T. H., Tanner, K. E., Bonfield, W., Girish Kumar, N. V., Rawlings, D., Sher, J. L., Cullinan, R., Young, M. T., O’Rourke, S. C., Howard-Hildige, R., Insley, G., Dowling, D. P., Donnelly, K., Kola, P. V., Kelly, T. C., Brummitt, K., Lloyd, L., Eloy, R., Therin, M., Weill, N., Battles, E. P., Hill, R. G., Devitt, A., Rice, J., McCormack, D., Felle, P., McManus, F., Bryan, K. J., Buggy, M., Kirrane, F., Malone, J. F., Coyle, E., Stewart, B., Hatfield, S., Farrell, M., Duignan, F., Reilly, R., Bray, D., Kenny, P., Rice, J., McCormack, B. A. O., O’Rourke, S. K., Ryan, A. K., Orr, J. F., Mitchell, C., Murphy, A. C., Hill, R. G., O’Neill, P., Chawke, P., Birkinshaw, C., Leahy, J. J., Taylor, D., O’Reilly, J. P., Manning, J. M., Masterson, B. F., Duffy, J. M., Winder, R. J., Gilmore, G. J., Orr, J. F., Gallagher, D., Graham, H. K., Rodda, J., Boyd, R., Cantillon, D., Fushimi, F., Birkinshaw, C., Nugent, C. D., Webb, J. A. C., Wright, G. T. H., Black, N. D., Boyd, A., Meenan, B. J., Akay, M., Leyland, N., Maher, S., McCormack, B. A. O., Smith, N., Sun, D. C., Stark, C., Dumbleton, J. H., Keenan, D. B., Owens, F. J., Donnelly, P. G., O’Rourke, S. C., Howard-Hildige, R., Pichon, D., Nawana, N., McCormack, B. A. O., Prendergast, P. J., Kavanagh, A., McGloughlin, T., van Driel, W. D., Prendergast, P. J., Huiskes, R., O’Connor, J., Leardini, A., Lu, T. W., Catani, F., Lee, T. C., Arthur, T. L., Gibson, L, J., Myers, E. R., Hayes, W. C., McGloughlin, T., O’Connor, J., Gill, R., Chen, W. L., and Kelly, P.

Published
1998
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42. Zinc ion release from novel hard tissue biomaterials.

Author

Towler, M. R., Kenny, S., Boyd, D., Pembroke, T., Buggy, M., and Hill, R.G.

Subjects
ZINC, CEMENT, IONS, ALUMINUM, BIOMEDICAL materials, BIOMEDICAL engineering
Abstract

Zinc polyalkenoate cements (ZPCs) and glass polyalkenoate cements (GPCs) are used routinely in dentistry, but have potential for orthopaedic applications as they set at body temperature without shrinkage or significant heat evolution. However, the materials have drawbacks; ZPCs are biocompatible in implant studies, but a fibrous collagen capsular layer forms adjacent to the cement. GPCs are bioactive in the bone environment as a result of the release of calcium, phosphate and fluoride ions, as well as the formation of a silicious gel phase, but research has shown that aluminum ions released result in defective bone mineralisation and as a consequence the ability of these cements to chemically bond to bone is lost. Two approaches have been developed to overcome these problems. The ZPC route considers a ZnO : hydroxyapatite (HA) : poly(acrylic acid) (PAA) mixture, the HA incorporated to improve bioactivity. The GPC route employs a calcium zinc silicate glass; the zinc taking the role that aluminum plays in conventional GPCs. This study has shown that cements can be formulated by an acid base reaction between PAA and both calcium zinc silicate glasses (GPCs) and a mixture of hydroxyapatite and zinc oxide (ZPCs). The moduli of these cements are comparable to both bone and conventional acrylic cements, highlighting their potential for biomedical applications. Unfortunately, both materials have previously been shown to be toxic by cell culture methods, as a result of high zinc ion release, and so it is necessary to study ion release profiles of the cements in order to determine the magnitude of this release. Considering the ZPCs, the modulus of the cement has an inversely proportional relationship to the zinc ion release. From the data presented it is clear that increases in polymer concentration results in lower amounts of zinc ions being released, whilst molar mass of the PAA has no influence. Therefore it would appear that polymer concentration has a significant influence over ion release. Generally, the amount of Zn2+ released decreases with increasing HA content and/or decreasing ZnO content. Considering the GPCs, the materials are all seen to release large amounts of the active ion, when compared to the commercial versions. The extent of this release increases with temperature and agitation. The release could be minimised by an increased P : L mixing ratio, and an increased PAA concentration, which would produce a more cross‐linked cement matrix. Minimising the release of the active ion should improve the in vitro bioactivity of both materials. However, for a full understanding of the clinical benefits of such materials, an in vivo study would be required. [ABSTRACT FROM AUTHOR]

Published
2004

44. A Study of Environmentally Friendly Titanium Pretreatments for Adhesive Bonding to a Thermoplastic Composite

Author

Leahy, W., Young, T., Buggy, M., and Barron, V.

Abstract

The increased use of fibre reinforced polymer composites for aircraft structures have highlighted the need for reliable methods of bonding these materials to metallic components such as titanium. There is also a need for a simple test to evaluate adhesive bonds with dissimilar substrates, while under load and in a variety of environments. In this study the Boeing wedge test has been adapted for use with metal to composite adhesive bonds. A flexural rigidity matching approach was used with the addition of a backing beam to the composite coupon. The titanium adherends were surface pre-treated using novel environmental benign methods, namely argon gas plasma and silicon sputtering. Sodium hydroxide anodisation, which is currently used industrially and alumina grit blasting were used as benchmarks. The composite, glass fire reinforced polyphenylene sulphide was alumina grit blasted. An environmental cycle was used to mimic a typical aircraft service cycle; joints were subjected to 24-hour cycles of ambient, 60 °C water immersion, 60 °C dry and –55 °C dry for 12 days. Crack propagation and locus of failure were monitored after each cycle.

Published
2003
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