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T A Spierings

Publications and source records attributed to T A Spierings.

7 recordsLinked to original sources
PubMed1987

Verification of theoretical modeling of heat transmission in teeth by in vivo experiments.

A theoretical axisymmetric tooth model, simulating the conditions involved in the drinking of a liquid of a certain temperature, was compared with results of a similar in vivo experiment. The temperature changes as a result of one draught of a hot/cold liquid were recorded within the model as well as in the surrounding environment. The experimental data obtained were compared with the calculated results for the theoretical model as determined by the Finite Element Analysis. The temperatures recorded experimentally agreed reasonably with the calculated results. It can be concluded that the assumptions which have been made concerning the described thermal loading conditions lead to a good approximation of the physical reality.

Cold Temperature↗
PubMed1984

The influence of restorative dental materials on heat transmission in human teeth.

Using the finite element method, we analyzed the temperature distribution and heat flow patterns in an axisymmetric tooth model. The models of an unrestored tooth and three teeth restored with different restorative materials were evaluated comparatively. The insulating ability of a calcium hydroxide cement base (Ca(OH)2) is low, which is inherent in its insufficient thermal and poor mechanical properties. In the given conditions, the Ca(OH)2 base reduces the temperature increase at the cement-dentin interface by 12.5% with respect to a restoration of amalgam only. By using a double base (Ca(OH)2 + polymer-modified zinc oxide-eugenol), the reduction is 21.9%. With respect to a sound tooth model, the presence of a double base in the restored tooth caused a temperature increase of only 0.1 degree C at the pulpo-dentinal junction. The thermal conductivity coefficient (lambda) of amalgam does not have any influence on the results of the calculations. The heat transfer coefficient (alpha) turned out to be an essential parameter in this mathematical model.

Calcium Hydroxide↗
PubMed1984

Surface temperature of oral tissues. A review.

The storage of heat in the human body is regulated by a meticulous physiological control of heat production and heat loss. The heat regulation of the dentition and in particular of the pulp tissue is still disputed. Several methods have been used for measuring the surface temperature of the oral tissues. Until now a thermocouple seems to have been the easiest instrument to use for this purpose. Although there is a lack of information about environmental and testing conditions, an approximation of the surface temperatures of the dentition (30-35 degrees C) and soft tissues (32-37 degrees C) has been made based on a literature review.

Body Temperature Regulation↗
PubMed1983

A simulation model for transient thermal analysis of restored teeth.

A theoretical model was developed to analyze the influence of various cement bases on temperature distribution and heat flow in restored teeth. A physical model of a molar was developed to simulate different thermal processes by simple parameter variation. The time-dependent temperature field was calculated using the finite element method (FEM). The values for material properties and thermal load were chosen from the dental literature. The results are in good agreement with clinical experimental research as published by Trowbridge et al. It is concluded that the model is a valid tool for further research with regard to the influence of restorative materials and cavity design on the thermal behavior of restored teeth.

Dental Cavity Lining↗