Development of an optical measuring system for three-dimensional jaw movements.
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概要
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Jaw movements provide valuable data both for diagnosis and treatment in dental clinic. So many technics and instruments have been developed and tested, but for most of them measurable points on the jaw have been limited.In order to measure motions of an arbitrary point on the jaw relatively easily, a method that assumed the jaw to be a rigid body has been used in recent years. On this standpoint, a system using light-emitting diodes (LED), position sensitive detectors (PSD) and a mini-computer has been developed. Measuring of the motions of the jaw assumed to be a rigid body was carried out by measuring motions of the three LEDs attached to it rigidly. Motions of an arbitrary point on the jaw could be easily calculated from LED motions, if the position of the point with respect to the LEDs had been measured.The LEDs and the PSDs were mounted respectively on a lower jaw face-bow and an upper jaw face-bow that were attached to each dental arch using resin clutches. The position of each LED was detected with a PSD camera at every 10ms. Then the voltage signals of two channels relating to the two dimensional position of light spot on the PSD sensing sarface were obtained.In order to obtain the three-dimensional position of all LEDs, a method using inter-LED distances has been developed. Using characteristics of the optical system and the PSD, a straight line of E3 in which each LED existed has been obtained. Then using inter-LED distances, it has been possible to determine each LED position.When all considerable factors that may have been causes measurement errors were accounted for, the overall position accuracy proved to be better than 0.13mm and the position resolution was found to be 0.04mm.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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