Arita Emiko S, Silveira Gilson P, Cortes Arthur R, Brucoli Henrique C
Department of Oral Radiology, Sao Paulo University, Sao Paulo, Brazil.
Eur J Esthet Dent. 2012 Winter;7(4):430-8.
The development of countless types and trends of high viscosite and flowable composite resins, with different physical and chemical properties applicable to their broad use in dental clinics calls for further studies regarding their radiopacity level.
The aim of this study was to evaluate the radiopacity levels of high viscosity and the flowable composite resins, using digital imaging.
96 composite resin discs 5 mm in diameter and 3 mm thick were radiographed and analyzed. The image acquisition system used was the Digora® Phosphor Storage System and the images were analyzed with the Digora software for Windows. The exposure conditions were: 70 kVp, 8 mA, and 0.2 s. The focal distance was 40 cm. The image densities were obtained with the pixel values of the materials in the digital image.
Most of the high viscosity composite resins presented higher radiopacity levels than the flowable composite resins, with statistically significant differences between the trends and groups analyzed (P < 0.05).
Among the high viscosity composite resins, Tetric®Ceram presented the highest radiopacity levels and Glacier® presented the lowest. Among the flowable composite resins, Tetric®Flow presented the highest radiopacity levels and Wave® presented the lowest.
无数类型和趋势的高粘度及可流动复合树脂不断发展，其具有不同的物理和化学性质，适用于牙科诊所的广泛应用，这就需要对其射线不透性水平进行进一步研究。
本研究旨在使用数字成像评估高粘度和可流动复合树脂的射线不透性水平。
对96个直径5毫米、厚3毫米的复合树脂圆盘进行射线照相并分析。使用的图像采集系统是Digora®磷存储系统，图像用适用于Windows的Digora软件进行分析。曝光条件为：70 kVp、8 mA和0.2秒。焦距为40厘米。通过数字图像中材料的像素值获得图像密度。
大多数高粘度复合树脂的射线不透性水平高于可流动复合树脂，在所分析的趋势和组之间存在统计学显著差异（P < 0.05）。
在高粘度复合树脂中，Tetric®Ceram的射线不透性水平最高，Glacier®最低。在可流动复合树脂中，Tetric®Flow的射线不透性水平最高，Wave®最低。
