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Proceedings Paper

Thermographic analysis of surface damage in teeth
Author(s): M. Conde-Contreras; J. Bante-Guerra; E. Hernandez-Garcia; A. M. Hernandez; S. Trujillo; P. Quintana; J. J. Alvarado-Gil
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Paper Abstract

The analysis of the surface of teeth is an important field of research and technological development due to the importance of dental pieces in health and aesthetics. The presence of cracks as well as the etching effects on teeth surface, due to different chemical agents, affects not only the appearance of teeth but its integrity. In this work, laser thermography analysis of dental pieces with damage in the form of cracks is presented. The technique consists in the illumination of the surface at the center of the sample, using a 300 mW pulsed solid state laser beam focused with a gradium lens, and monitoring the spatial and temporal distribution of the temperature field. The heating of the sample is monitored using a focal plane array infrared camera, sensitive in the spectral range 7.5-13 μm with a noise equivalent temperature difference of 0.12°C. The data acquisition was performed by the PC firewire port using a PCI-8254R card and a home-made program in Labview 8.0 was used for data acquisition. The images were processed in a home-made linux program to obtain the experimental table values. Our results are compared with position and frequency scans obtained by infrared photothermal radiometry. It is shown that the crack in the tooth appears as an increase in the photothermal signal. In contrast, the thermographic image shows a more detailed structure in which close to the crack the temperature increases, but at the crack the signal falls.

Paper Details

Date Published: 11 February 2008
PDF: 8 pages
Proc. SPIE 6843, Lasers in Dentistry XIV, 68430C (11 February 2008); doi: 10.1117/12.764927
Show Author Affiliations
M. Conde-Contreras, Ctr. de Investigación y Estudios Avanzados del I.P.N. (Mexico)
J. Bante-Guerra, Ctr. de Investigación y Estudios Avanzados del I.P.N. (Mexico)
E. Hernandez-Garcia, Univ. Autónoma de Yucatán (Mexico)
A. M. Hernandez, Ctr. de Investigación y Estudios Avanzados del I.P.N. (Mexico)
S. Trujillo, Ctr. de Investigación y Estudios Avanzados del I.P.N. (Mexico)
P. Quintana, Ctr. de Investigación y Estudios Avanzados del I.P.N. (Mexico)
J. J. Alvarado-Gil, Ctr. de Investigación y Estudios Avanzados del I.P.N. (Mexico)


Published in SPIE Proceedings Vol. 6843:
Lasers in Dentistry XIV
Peter Rechmann; Daniel Fried, Editor(s)

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