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通常应用牙科 X 光机投照口内根尖牙片的主要技术条件包括:(1)患者坐位,头的矢状面与地面垂直;(2)X 线中心射线垂直于牙齿长轴和胶片所形成角度的分角线,并与被照牙齿的邻面平行;(3)X 线中心射点的方位准确等。稍有失误都可能造成牙片影像模糊失真,影
The main technical conditions that the dental X-ray machine usually uses to deliver the intra-auricular root tip tooth fragments include: (1) the patient sitting with the sagittal plane of the head perpendicular to the ground; (2) the X-ray central ray is perpendicular to the long axis of the tooth and the film Angle of the angle line, and with the teeth were photographed parallel to the adjacent surface; (3) X-ray center point of injection accuracy and so on. Slight mistakes may cause tooth image fuzzy distortion