Effect of aging on the microstructure, hardness and chemical composition of dentin
Por:
Montoya, C., Arango-Santander, S., Peláez-Vargas, A., Arola, D., Ossa, E.A.
Publicada:
1 dic 2015
Resumen:
Objective: Understanding the effects of biological aging on human
tissues has been a topic of extensive research. With the increase in
healthy seniors and quality of life that topic is becoming increasingly
important. In this investigation the effects of aging on the
microstructure, chemical composition and hardness of human coronal
dentin was studied from a comparison of teeth within ``young'' and
``old'' age groups.
Methods: The microstructure of dentin within three regions (i.e., inner,
middle and outer) was analyzed using electron and optical microscopy.
The mineral-to-collagen ratio in these three regions was estimated using
Raman spectroscopy and the hardness was evaluated using
microindentation.
Results: Results showed that there were significant differences in
tubule density, tubule diameter and peritubular cuff diameter with
depth. Although there was no difference in tubule density and diameter
of the tubules between the age groups, there was a significant
difference in the occlusion ratio. A significant increase in hardness
between young and old patients was found for middle and outer dentin. An
increase in mineral-to-collagen ratio from inner to outer dentin was
also found for both groups. In old patients, an increase in mineral
content was found in outer coronal dentin as a consequence of tubule
occlusion.
Conclusions: An increase in occlusion ratio, hardness, and mineral
content was found in the dentin of adult patients with age. This
increase is most evident in the outer coronal dentin. (C) 2015 Elsevier
Ltd. All rights reserved.
Filiaciones:
Montoya, C.:
Materials Engineering Research Group, School of Engineering, Universidad Eafit, Medellín, Colombia
Arango-Santander, S.:
Faculty of Dentistry, Universidad Cooperativa de Colombia, Envigado, Colombia
Peláez-Vargas, A.:
Faculty of Dentistry, Universidad Cooperativa de Colombia, Envigado, Colombia
Arola, D.:
Department of Materials Science and Engineering, University of Washington, Seattle, WA, United States
Ossa, E.A.:
Materials Engineering Research Group, School of Engineering, Universidad Eafit, Medellín, Colombia
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