[Experimental optical impression in the CAD/CAM Dental Restorative System]

A three dimensional measuring system was developed for the dental restorative CAD/CAM system. The equation of (formula; see text) was used for the computer simulation to demonstrate reproductibility of this measuring system, then actual measurements were also performed. The result from the simulation and from the measurement coincided, consequently it was concluded that the equation could explain the reproducibility of the system. Speckle and unwanted reflected light were found to be the main factors in restricting the range of good reproducibility. So new measuring systems based on the use of a two-beam interfere system were developed, which cancelled out the influence of these factors.