Gürdal P, Akdeniz B G
Department of Oral Diagnosis and Radiology, Ege University School of Dentistry, Bornova, Turkey.
Dentomaxillofac Radiol. 1998 Jul;27(4):236-9. doi: 10.1038/sj/dmfr/4600357.
To compare radiographic densitometry with indirect digital image analysis for evaluating the radiopacity of nine different resin-based restorative materials.
Discs of amalgam and nine different resin-based restorative material, 10 mm in diameter and 2 mm thick, were radiographed together with 2 mm thick discs of intact and carious human teeth and an aluminium stepwedge. Density was evaluated by digital transmission densitometry and with the histogram function of an image analysis programme (Image Tool 1.27, University of Texas Health Sciences Center, Texas, USA) following the digitization of the radiographs with a drum scanner.
The two methods produced essentially similar results. With both methods, Dyract (Dentsply De Trey, Konstanz, Germany) had the highest radiodensity and Estilux Hybrid (Kulzer, Werheim, Germany) the lowest.
Digital image analysis is a suitable alternative to transmission densitometry for evaluation of the radiopacity of restorative materials.
比较射线密度测定法与间接数字图像分析评估九种不同树脂基修复材料射线不透性的效果。
将直径10毫米、厚2毫米的汞合金和九种不同树脂基修复材料的圆盘与完整和龋坏的人牙2毫米厚的圆盘以及一个铝阶梯楔形块一起进行射线照相。在使用鼓式扫描仪对射线照片进行数字化处理后，通过数字传输密度测定法和图像分析程序（Image Tool 1.27，美国德克萨斯大学健康科学中心，德克萨斯州）的直方图功能评估密度。
两种方法得出的结果基本相似。两种方法中，Dyract（德国康斯坦茨登士柏德特雷公司）的射线密度最高，Estilux Hybrid（德国韦尔海姆库尔泽公司）的射线密度最低。
数字图像分析是评估修复材料射线不透性的一种适用于替代透射密度测定法的方法。
