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牙周病是口腔科最为常见的疾病之一,X线片对于牙周病诊断,牙周病病程进展及治疗效果的观察等均具有重要意义。由于曲面体层摄影X线片的清晰度、锐利度较差,牙齿牙槽突影象失真较大,难以对牙槽突的情况进行准确观察,因而在临床上仍然广泛应用根尖片分角技术检查方法。国外目前已广泛应用根尖片平行投照技术,而国内目前尚未推广应用。本文将对平行投照技术的投照方法,投照要点及优缺点做重点叙述。平行投照技术是由Mccormick1902年首先描述,摄影原理是胶片位置与被照牙齿的长轴平行,X线中心线垂直于被照牙的长轴和胶片中心(图1)。
Periodontal disease is one of the most common dental diseases, X-ray film for the diagnosis of periodontal disease, periodontal disease progression and treatment of the observation are of great significance. As the surface tomography X-ray film sharpness, poor sharpness, tooth alveolar process image distortion is large, it is difficult to accurately observe the situation of alveolar protrusion, which is still widely used in clinical root tip film angle Technical inspection methods. At present, the technology of root tip parallel projection has been widely used in foreign countries, but not yet popularized and applied in China. This article will focus on the projection method of parallel projection technology, projection highlights and advantages and disadvantages. The parallel projection technique was first performed by Mccormick in1902. The photographic principle is that the film position is parallel to the long axis of the tooth being taken and the X-ray centerline is perpendicular to the long axis of the tooth and the center of the film (Figure 1).