A Vision Based Reverse Engineering Approach To
Surface Digitizing In Restorative Dentistry
Author(s)
K. Alemzadeh & L. Zhang
Abstract
Computer Aided Design and Manufacture (CAD/CAM), and Reverse
Engineering (RE) are employed to machine and enhance the fitting accuracy of
ceramic inlays. A vision system (VS) based Reverse Engineering approach is
currently being developed for surface digitizing where two dimensional (2-D)
images of the teeth from CCD cameras are used to create three dimensional (3-
D) CAD model. This approach involves using shape recovery from a series of
profile images of teeth. A camera calibration technique is used to minimize the
image distortion caused by lenses. Assuming the teeth have no regional
concaved surface (e.g. incisors), the slicing algorithm, derived from occluding
boundaries technique, attempts to generate surface point data (point cloud) from
the profile images. Disparity maps of various teeth between this VS and
Renishaw plc.’s dental Triclone system has been carried out to evaluate the
accuracy of the VS.
Keywords: vision system, slicing method, surface reconstruction, restorative
dentistry.
1 Introduction
Reverse Engineering (RE) is an advanced reverse design technique to create 3-D
free form surfaces from an existing physical model using laser or contact probe
as a surface digitizer [1]. RE is used as a powerful tool for initial conceptual and
aesthetic design, product prototyping, performance testing, and model
modification needed for obtaining an optimal product design [2]. A vision
system uses an optical scanning method similar to laser probe but it is safer.
Keywords
vision system, slicing method, surface reconstruction, restorativedentistry.
Related Book
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