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A New 3D Contour Extraction Method for Tooth Cavity in a Dental CAD/CAM System

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Abstract

In dental CAD/CAM system, tooth restoration produces customized tooth with a prepared cavity, while the prosthetic tooth fitting is firstly determined by the contour feature of the cavity, the cavity contour extraction of the tooth is one of the important issue. In order to accurately extract the cavity contour, a new Three-Dimension (3D) optimal path searching algorithm based on Intelligent Scissors theory is presented. In this algorithm, the 3D tooth is firstly formulated as a weighted model, by calculating the minimum weigh sum of the local cost from a start point to an end point in the cavity edge, the initial optimal contour can be acquired. Then through restricting the path searching range and searching direction, a desired contour can be extracted dynamically. The cases study results show that the algorithm produces a 3D mathematically piece-wise optimal contour on the cavity edge, which can be used directly for tooth design. This method simplifies the tooth design processes and increases the design efficiency.

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Acknowledgements

The project is supported by the Foundation for the Applied Basic Research of Tianjin, China (No. 07JCYBJC04800), and the Specialized Research Fund for the Doctoral Program of Higher Education of China: New Teachers Fund Project (No. 200800561081). The authors would like to thank the School of Stomatology of Tianjin Medical University for providing an amount of tooth scans for us.

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Authors and Affiliations

  1. School of Mechanical engineering, Tianjin University, Tianjin, 300072, China

    Shu-Xian Zheng, Jia Li & Qing-Feng Sun

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  1. Shu-Xian Zheng
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  2. Jia Li
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  3. Qing-Feng Sun
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Correspondence to Jia Li.

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Zheng, SX., Li, J. & Sun, QF. A New 3D Contour Extraction Method for Tooth Cavity in a Dental CAD/CAM System. J Med Syst 36, 1359–1364 (2012). https://doi.org/10.1007/s10916-010-9596-7

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  • DOI: https://doi.org/10.1007/s10916-010-9596-7

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