Levander E, Bajka R, Malmgren O
Department of Orthodontics, Eastmaninstitutet, Stockholm, Sweden.
Eur J Orthod. 1998 Feb;20(1):57-63. doi: 10.1093/ejo/20.1.57.
The purpose of this study was to evaluate the sensitivity of digital radiographs for detection of (i) simulated root resorption cavities in an experimental model and (ii) orthodontically-induced apical root resorption in vivo. The severity of root resorption after 3 and 6 months treatment was studied in relation to root form. The experimental study cavities, drilled in mandibular roots in a dry skull, were recorded in conventional and digital radiographs. In vivo root resorption was evaluated on digital radiographs of 92 maxillary incisors after 3 and 6 months treatment with fixed appliances. The results showed a similar sensitivity for the two methods. Sensitivity increased significantly with cavity size. After 3 months apical root resorption was detected in only a few teeth. The number had increased significantly after 6 months. There was a higher degree of root resorption in teeth with blunt and pipette-shaped apices. In such teeth a 3-month radiographic control is recommended.
本研究的目的是评估数字X线片检测以下情况的敏感性：（i）实验模型中模拟的牙根吸收腔，以及（ii）体内正畸诱导的根尖牙根吸收。研究了治疗3个月和6个月后牙根吸收的严重程度与牙根形态的关系。在干燥颅骨的下颌牙根上钻出的实验性研究腔，在传统X线片和数字X线片中进行记录。对92颗上颌切牙在使用固定矫治器治疗3个月和6个月后的数字X线片进行体内牙根吸收评估。结果显示两种方法的敏感性相似。敏感性随腔隙大小显著增加。3个月后仅在少数牙齿中检测到根尖牙根吸收。6个月后数量显著增加。根尖钝圆和滴管形的牙齿牙根吸收程度更高。对于此类牙齿，建议进行3个月的影像学检查。
