Development of Stereoradiography for the alveolar bone

本研究的目的是开发一种临床方法来记录和分析牙齿及其牙周组织的立体放射图像。它由一个胶片支架和一个咬合机翼组成。和一个指针。所设计的X线机由2根X射线管组成。管间焦距为9.6 cm。X射线的中心线与焦间平面相交55厘米。一个可折叠的指针被用来指示交叉点。曝光时间可在0.1~2.0s之间调节。为了显示牙周袋的底部，在袋中插入4根直径分别为0.4 mm和0.5 mm的不锈钢丝。为了显示舌侧，将舌丝的末端弯曲。在该方法的发展阶段，使用拔除的人牙和干燥的人头骨的牙齿进行X光曝光。进行了一些临床应用。用立体显微镜(Topkon Co.Ltd.)观察图像。或者不使用任何特殊设备。如果观察者习惯于这种方法，也可以用肉眼对图像进行立体识别。这种方法对于获得牙齿及其牙周组织的立体放射图像是有用的。

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.