Importance of tubule density to the fracture toughness of dentin
Por:
Montoya, C., Arola, D., Ossa, E.A.
Publicada:
1 jul 2016
Resumen:
Objective: The fracture toughness of dentin is critical to the
prevention of tooth fracture. Within the tooth crown, the mechanical
properties of dentin are influenced by spatial variations in the density
and diameter of the dentin tubules with distance from the pulp. There
are also relevant changes to the microstructure of dentin with age. In
this investigation the importance of tubule density to the fracture
toughness of dentin was evaluated in ``young'' and ``old'' age
groups.
Methods: The variations in microstructure (density and diameter of
tubules) from young and old donor teeth were studied by means of optical
microscopy.
Results: A reduction in the density and diameter of tubules was
identified to occur with aging. An approach previously proposed to study
the mechanical behavior of porous materials was used to model the
fracture toughness of coronal dentin in terms of the tubule
characteristics. Results were then compared with published results from
previous studies.
Conclusions: The model predictions were consistent with experimental
results for the fracture toughness of dentin from young donor teeth, but
overestimated the values that have been reported for ``old'' dentin.
(C) 2016 Elsevier Ltd. All rights reserved.
Filiaciones:
Montoya, C.:
Department of Production Engineering, School of Engineering, Universidad Eafit, Medellín, Colombia
Arola, D.:
Department of Materials Science and Engineering, University of Washington, Seattle, WA, United States
Ossa, E.A.:
Department of Production Engineering, School of Engineering, Universidad Eafit, Medellín, Colombia
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