标准牙片持片器的设计及临床评价

Clinical evaluation of a radiographic film holder for standardized alignment of intraoral film

目的:介绍自行设计标准牙片持片器的设计、工作原理,并评价用该持片器拍摄牙片的可重复性。方法:选择具有健康、完整牙列志愿者20例。同一牙位拍摄2组牙片,一组为咬翼片,另一组为标准牙片投照装置拍摄的定位牙片,拍摄间隔为1h,获得2组20对牙片。测量釉牙骨质界-牙槽嵴顶距离(CEJ-AC)及邻牙釉牙骨质界点间距离(CEJ-CEJ)。结果:主观评价显示该投照装置的可重复性好,传统咬翼片可重复性较差,前后2次投照咬翼片CEJ-AC及CEJ-CEJ差值比标准牙片大,差异有显著性(P<0.05)。结论:使用标准牙片持片器拍摄的牙片可重复性好于咬翼片,可明显提高牙片图像的可重复性。

Objective：To introduce a self-made film holder for standardized alignment of intraoral film and to evaluate its validity. Methods：The film holder, consisting of film backing, bite block and indicating part, was made of a kind of transparent material. 20 patients were photographed using the film holder for serial dental films and another 20 patients were photographed using conventional bitewing instrument. The distance between the cemento-enamel junction and alveolar crest and the distance between cemento-enamel junction of adjacent teeth were measured on the serial films taken in the two groups. Results：The films taken by the use of film holder showed greater reproducibility than those by bitewing. Variables changes were significant smaller in film holder group than those in bitewing group. Conclusion：The film holder can be used as a instrument for standardized alignment of intraoral film.