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Microstructure and Adhesive Properties of Copal Composite in Dental Incrustations

Published online by Cambridge University Press:  01 February 2011

M. N. Orta-Amaro
Affiliation:
Instituto de Física UNAM, Apartado Postal 20-364, 01000 México D. F., México.
J. A. Rodríguez-Chávez
Affiliation:
Facultad de Odontología, Universidad de Guadalajara, Sierra Morena 950, Guadalajara, Jalisco, Mexico.
I. A. Belío-Reyes
Affiliation:
Facultad de Odontología, Universidad Autónoma de Sinaloa, Blvd. de las Américas y Universitarios, 80010 Culiacán, Sinaloa, México.
L. Bucio
Affiliation:
Instituto de Física UNAM, Apartado Postal 20-364, 01000 México D. F., México.
J. Arenas-Alatorre
Affiliation:
Instituto de Física UNAM, Apartado Postal 20-364, 01000 México D. F., México.
J.L. Espinoza
Affiliation:
Coordinación Estatal de Salud Bucal, Secretaria de Salud del Estado de Sinaloa, Culiacán, Sinaloa, México.
M. C. Flores-Grajeda
Affiliation:
Facultad de Odontología, Universidad Autónoma de Sinaloa, Blvd. de las Américas y Universitarios, 80010 Culiacán, Sinaloa, México.
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Abstract

There are evidences that in ancient cultures in Mexico, copal was probably used for gluing precious stones in teeth cavities and for dental restorations as well. This is an important reason for making experiments using copal and copal-based composites in order to have more information for the potential applications of this material in modern dentistry. In our experiments concerning with dental incrustations of turquoise, we have practiced round cavities (about 1 mm depth) in the middle of incisive teeth by using a low-speed air turbine. Turquoise was cut in such a way that fits exactly on the tooth cavity. Copal and powdered apatite were used to glue the stone into the cavity. With Scanning electron microscopy we have observed that the composite copal-powdered apatite, penetrates the dentin tubules in the tooth tissue (depth of penetration from 5.6 to 41 micrometers), suggesting the existence of a micromechanical adherence. Concerning to the characterization of the adhesive properties, we have applied the ASTM D2095-72 test considering the adhesion of two cylinders of bone, and the copal composite as the adhesive. A maximum cohesive tensile strength around 0.1 MPa for elastic response was measured for hydroxyapatite compositions of 0, 25 and 75 wt%. We will discuss these results considering the reports of dental incrustations in ancient Mexico.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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References

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