Development of Stereoradiography for the alveolar bone

本研究的目的是建立一种记录和分析牙齿及其牙周组织立体X线图像的临床方法。它包括一个薄膜保持器，一个咬合翼。和指针。所设计的X射线装置由2个X射线管组成。管的焦距为9.6cm。X射线束的中心线与焦间平面相交55 cm。一个可折叠的指针被用来指示交叉点。可以在0.1和2.0 s之间调整曝光时间。为了显示牙周袋的底部，将4根不锈钢丝（直径=0.4和0.5 mm）插入袋中。在此方法的发展阶段，我们用离体牙和干燥人颅骨牙进行X线曝光。临床应用中，使用Topkon公司的立体镜观察图像。或者不使用任何特殊设备。如果观察者习惯了，也可以通过肉眼对图像进行立体感知，这种方法对于获得牙齿及其牙周组织的立体放射图像很有用。

The purpose of this research is to develop a clinical method to record and analyze stereoradiographic images of teeth and their periodontal tissues.The collimating device was made for each patient. It consisted of a film holder, a bite wing. and a pointer. The x-ray apparatus designed was consisted of 2 x-ray tubes. Interfocal distance of tubes was 9.6 cm. The center lines of the x-ray beams crossed 55 cm from the interfocal plane. A collapsible pointer was incorporated to indicate the crossing point. It was possible to adjust the exposure time between 0.1 and 2.0 s.To show the bottom of the periodontal pocket, 4 pieces of stainless steel wire(diameter=0.4 and 0.5 mm) were inserted into the pocket. To indicate lingual side, the ends of the lingual wire were bent.Extracted human teeth and teeth with dry human skull were used to make x-ray exposures during the developmental stage of this method. A few clinical application was conducted.Observation of the image was made using a stereoscope (Topkon Co. Ltd.) or without using any special equipment. If the observer was accustomed to it, stereognosis of the image was also possible by unaided eye.This method was useful to obtain a stereoradiographic image of teeth and their periodontal tissues.