多角度投照技术在上颌第一恒磨牙近颊根管识别中作用的研究

多角度投照技术在上颌第一恒磨牙近颊根管识别中作用的

研究

汪敏;孙虹;李桥;潘乙怀;邓辉;欧阳玉玲

【期刊名称】《口腔医学》 【年(卷),期】2012(032)009

【摘要】Objective This study was undertaken to investigate the efficiency of different angulation radiograph in diagnosing twin canals in the mesiobuccal roots of maxillary permanent first molars. Methods Forty extracted maxillary permanent first molars were collected. Two kinds of radiographs were taken of each tooth,and they were periapical radiographs with files or not. 14 photographs were taken of each tooth at 5°intervals between 0°and 30°. The teeth were made into transparent specimens to identify the number of canals in the mesiobuccal roots. Results The percentage of MB2 in the 40 maxillary first molars was 67. 50% . The detection rate of MB2 in the periapical radiographs with files was higher than that in the ones without files. The optimum beam angulations in periapical radiographs with files and without files were mesio-15° and raesio-20° respectively. Conclusions Periapical angulated radiographs with or without files in canals are useful for detection and diagnosis of MB2 canals in the maxillary permanent first morlars.%目的 探讨X线不同投照角度对上颌第一恒磨牙近中颊根双根管的识别作用.方法 选取临床拔除的上颌第一恒磨牙40个,在无诊断丝和存在诊断丝情况下分别进行