Study on Accuracy of Electronic Pantograph by using a Semi-Adjustable Articulator
Kazuhiro Yazawa · Nihon Gaku Kōgō Gakkaishi/Nihon Gaku Kougou Gakkaishi · 1983
There are two types of electronic pantograph available in Japan. One type is made in the United States (D instrument), and another type is made in Japan (H instrument) . Measuring accuracy of these types of electronic pantograph was compared in this study. Each of D instrument and H instrument was attached to the same semi-adjustable articulator, respectively, and the difference between the set values of the articulator and the output values of the electronic pantographs were obtained and evaluated. The results are summarized as follows:1. Concerning the measuring accuracy for sagittal condylar path inclination, the S. D. obtained from H instrument was three times and one-half smaller than that obtained from D instrument.2. H instrument resulted in the better measuring accuracy regarding the absolute values of the immediate side shift in comparison with D instrument. And, the S. D. of the date obtained from H instrument was 1.7 times smaller than that obtained from D instrument. Further, it was judged from the eye measurement that H instrument was superior to D instrument concerning the graphic displays of the horizontal lateral condylar paths.3. As for the measuring accuracy for progressive side shift, the S. D. obtained from H instrument was one and one-half times smaller than that obtained from D instrument when the sagittal condylar path inclination of the anticulator was fixed to 30 degrees. The output data regarding the progressive side shift obtained from D instrument altered in combination with the changes of sagitttal condylar path inclination although the progressive side shift of the articulator was fixed to the constant value.4. Abnormal data regarding sagittal condylar path inclination and progressive side sift were observed for D instrument.5. It may be concluded that the measuring accuracy of H instrument was 2.3 times better than that of D instrument when abnormal data were excluded. If those abnormal data were included, the measuring accuracy of H instrument was five times better than that of D instrument.6. A couple of reasons may be pointed out concerning the difference of the measuring accuracy between those two types electronic pantographs. The sensor of H instrument is non-contact type, while that of D instrument is contact type. Obviously, non-contact type of sensor results in the better measuring accuracy.Computer calculations are achieved in H instrument system so that movement of the center of condyle is obtained, While D instrument simply displays the results of measurement obtained outride of the face and calculations for obtaining the real movement of the center of condyle does not seem to be realized.