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Porous hydroxyapatite-based obturation materials for dentistry

Published online by Cambridge University Press:  31 January 2011

Witold Brostow ,
Miriam Estevez ,
Haley E. Hagg Lobland ,
Ly Hoang ,
J. Rogelio Rodriguez  and
Susana Vargar
Witold Brostow*
Affiliation:
Laboratory of Advanced Polymers & Optimized Materials, Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203-5310
Miriam Estevez
Affiliation:
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Querétaro, Qro. 76000, México
Haley E. Hagg Lobland
Affiliation:
Laboratory of Advanced Polymers & Optimized Materials, Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203-5310
Ly Hoang
Affiliation:
Laboratory of Advanced Polymers & Optimized Materials, Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76203-5310
J. Rogelio Rodriguez
Affiliation:
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Querétaro, Qro. 76000, México; and Centro de Investigación y Estudios Avanzados del Instituto Politécnico Nacional, Querétaro, Apdo. Postal 1-798, Qro., 76001, México
Susana Vargar
Affiliation:
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Querétaro, Qro. 76000, México
*
a)Address all correspondence to this author. e-mail: brostow@unt.edu
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Abstract

New porous biomaterials based on hydroxyapatite (HAp) were designed as obturation materials for dental cavities. Synthetic HAp powder with a particle diameter of 150 μm was agglutinated using three different polyurethane monocomponents (rigid, semi-rigid, and flexible), enabling the matching of their properties to those of real teeth. Alumina particles were also added in some cases. Our new hybrid materials contain up to 60% HAp. Interconnected pores range in size from 100 to 350 μm, while the pore volume fraction varies between 25% and 60%. Most of these materials possess the right morphology for implants and prostheses because their porous structures can be vascularized for bone and tooth ingrowth. Some samples also contain alumina particles to improve the abrasion resistance and to support the stresses produced during mastication. The materials were characterized by x-ray diffraction, scanning electron microscopy, and mechanical testing, along with abrasion, scratch, sliding wear, friction, and staining tests.

Keywords

CoatingCompositePolymer
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 6 , June 2008 , pp. 1587 - 1596
Copyright
Copyright © Materials Research Society 2008

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