数字化根尖片诊断牙根吸收的可靠性研究

目的对比数字化根尖片和普通根尖片在评价牙齿长度及牙根吸收方面的差异。方法选取20颗上颌恒中切牙建立体外牙根吸收研究模型。模拟牙根吸收前、后的情况,分别从6个投照角度拍摄普通根尖片和数字化根尖片。分别统计数字化根尖片和普通根尖片反映牙齿实际长度和实际牙根吸收的差异。结果在同一X线投照角度下,数字化根尖片与普通根尖片的影像长度误差之间有显著性差异,牙根吸收误差之间无显著性差异。结论数字化根尖片下的牙齿影像长度比普通根尖片更接近实际的牙齿长度。数字化根尖片与普通根尖片在对牙根吸收的测量诊断上没有明显差别。

Measurement accuracy of digital periapical films in diagnosis of root resorption

Objective To compare the measurement accuracy between digital periapical film and conventional film in measurements of tooth length and simulated root resorption.Methods An in vitro root resorption model was established from 20 extracted upper central incisors.Digital periapical and conventional periapical films were taken before and after simulated root resorption,from six different projection angles.Tooth lengths and simulated root resorption were measured using these films.The results were analyzed.Results The error in median tooth length produced by these two kinds of films was significantly different at the same projection angle.The error in root resorption length exhibited by the two kinds of films was not significantly different.Conclusion The digital periapical films in measuring tooth length is more accurate than conventional periapical films.But the two kinds of films are not different in diagnosing root resorption.