レーザとイメージセンサを用いた歯列模型の三次元形状測定

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  • Three-dimensional measurement of dental cast using laser and image-sensor.

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Despite frequent use of dental casts in the measurement of shapes of teeth and palate in daily practice, only a few reports on three-dimensional measurement of a dental cast are available. We have developed a computer-controlled device for the optical profile measurement of a dental cast using a laser and an image-sensor. A focused laser beam scans the dental cast which is fixed on a X-Y table. During the scanning the vertical positional change of the light spot on the cast is detected with a uni-dimensional 2048-pixel image-sensor. The device has been designed to achieve data aquisition time of 25 msec per point, measurable depth range of 40mm and minimum scanning pitch of 0.1mm. Experimental results show that longitudinal and lateral resolutions are within 0.05 and 0.1mm, respectively. As for the image processing, an algorithm of edge detection of the occlusal surface for the purpose of displaying a dental arch is described. The paper also refers to three-dimensional movement of the teeth during orthodontic treatment which is calculated by way of superposition of three-dimensional data taken from casts before and after the treatment.

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