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11 February 2008 Thermographic analysis of surface damage in teeth
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Proceedings Volume 6843, Lasers in Dentistry XIV; 68430C (2008)
Event: SPIE BiOS, 2008, San Jose, California, United States
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Conde-Contreras, J. Bante-Guerra, E. Hernandez-Garcia, A. M. Hernandez, S. Trujillo, P. Quintana, and J. J. Alvarado-Gil "Thermographic analysis of surface damage in teeth", Proc. SPIE 6843, Lasers in Dentistry XIV, 68430C (11 February 2008);

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