歯性上顎洞炎診断に対する口内法レ線の読影

抄録

Maxillary sinusitis of dental origin is caused by suppurative extension of the tooth supporting tissues which locate adjacent to the maxillary sinus, or rarely it can be caused when a chronically infected root is impacted into the maxillary sinus with tooth extraction.
To establish diagnosis of this type of sinusitis, the orally taken X-ray films give sval uable informations. Findings of the films are not final for the diagnosis but they should be considere dalong with other informations. Currently two types of films are available, the dental and the occlusal films. For adequate reading of the orally taken X-ray films, several points should be kept inmind. First in the oral technique, it is to be reminded that the films are not placed parallel to the tooth, but are placed so that actual length of the tooth is projected on the films. Therefore direction of the main X-ray beam and its relation to other structures should be well kept in mind with film reading. Secondly, in reading the dental roots and the adjacent areas, on should be meticulous about whether or not transparency around apex legion is present, whether or not the black lining of periodontium is normal in width and whether or not the defect of periodontium is visible around the lining of period on tium. These must be carefully observed on the X-ray films to rule out the suppurativelesions of the tooth supporting tissues. Then their relation to the maxillary sinus base is re-evaluated on t he films. All these informations should be available for the final diagnosis.