Cieszynskis'bisecting-angle technic contains some presumptive factor, which is plane of tooth, incline angle film and bisecting plane.Therfore retake chance with projectionmiss is often, and exact retention of film in oral cavity is comparatively difficult too.
In a paper entitled“The measuring apparatus of the direction of central-ray in in-traoral roentgenography”Shimano and others divised method make clear to sight presump-tive factor in bisecting-angle technic.
We make as a test filmhoder, which is connected with the measuring apparatus of the direction of central-ray, and state clearly direction of central-ray and make sure fixation of film in oral cavity, and attempt reduce to a minimum retake chance and exposure dose of X-ray.
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