Journal of Periodontal and Implant Science

Korean Academy of Periodontology (대한치주과학회)
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Automatic detection of tooth cracks in optical coherence tomography images

  • Kim, Jun-Min (Dental Research Institute, Seoul National University School of Dentistry) ;
  • Kang, Se-Ryong (Department of Biomedical Radiation Sciences, Seoul National University Graduate School of Convergence Science and Technology) ;
  • Yi, Won-Jin (Dental Research Institute, Seoul National University School of Dentistry)
  • Received : 2016.12.08
  • Accepted : 2017.01.30
  • Published : 2017.02.28
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Abstract

Purpose: The aims of the present study were to compare the image quality and visibility of tooth cracks between conventional methods and swept-source optical coherence tomography (SS-OCT) and to develop an automatic detection technique for tooth cracks by SS-OCT imaging. Methods: We evaluated SS-OCT with a near-infrared wavelength centered at 1,310 nm over a spectral bandwidth of 100 nm at a rate of 50 kHz as a new diagnostic tool for the detection of tooth cracks. The reliability of the SS-OCT images was verified by comparing the crack lines with those detected using conventional methods. After performing preprocessing of the obtained SS-OCT images to emphasize cracks, an algorithm was developed and verified to detect tooth cracks automatically. Results: The detection capability of SS-OCT was superior or comparable to that of trans-illumination, which did not discriminate among the cracks according to depth. Other conventional methods for the detection of tooth cracks did not sense initial cracks with a width of less than $100{\mu}m$. However, SS-OCT detected cracks of all sizes, ranging from craze lines to split teeth, and the crack lines were automatically detected in images using the Hough transform. Conclusions: We were able to distinguish structural cracks, craze lines, and split lines in tooth cracks using SS-OCT images, and to automatically detect the position of various cracks in the OCT images. Therefore, the detection capability of SS-OCT images provides a useful diagnostic tool for cracked tooth syndrome.

Keywords

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