Bortoluzzi Eduardo Antunes, Guerreiro-Tanomaru Juliane Maria, Tanomaru-Filho Mario, Duarte Marco Antonio Hungaro
School of Dentistry, Federal University of Santa Catarina, Florianópolis, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009 Oct;108(4):628-32. doi: 10.1016/j.tripleo.2009.04.044. Epub 2009 Aug 20.
The objective of this study was to evaluate the radiopacity of white Portland cement (PC) associated with bismuth oxide (Bi(2)O(3)), barium sulfate (BaSO(4)), iodoform (CHI(3)), and zirconium oxide (ZrO(2)). White mineral trioxide aggregate (WMTA) and PC without radiopacifier were used as positive and negative controls, respectively.
Following International Organization for Standardization (ISO) 6876/2001, 5 circular specimens (10 x 1 mm) were made from each material. After the materials set, radiographs were taken using occlusal film and a graduated aluminum step-wedge varying in thickness from 2 to 16 mm. The dental X-ray unit (GE1000) was set at 50 Kvp, 10 mA, 18 pulses/s, and distance of 33.5 cm. The radiographs were digitized, and radiopacity was compared with the aluminum step-wedge, using Wixwin-2000 software (Gendex). Data (mm Al) were analyzed using analysis of variance and Tukey tests.
The PC + Bi(2)O(3) and WMTA samples presented greater radiopacity (5.88 and 5.72 mm Al, respectively), followed by PC + ZrO(2) (3.87 mm Al) and PC + CHI(3) (3.50 mm Al). The PC + BaSO(4) and PC samples presented the lowest radiopacity values (2.35 and 1.69 mm Al, respectively), which were below the minimum value recommended by the ISO.
Analysis of the present results led to the conclusion that all of the materials tested presented acceptable radiopacity, except PC + BaSO(4) and pure PC.
本研究的目的是评估与氧化铋（Bi₂O₃）、硫酸钡（BaSO₄）、碘仿（CHI₃）和氧化锆（ZrO₂）相关的白色波特兰水泥（PC）的射线不透性。白色矿物三氧化物凝聚体（WMTA）和不含射线阻射剂的PC分别用作阳性和阴性对照。
按照国际标准化组织（ISO）6876/2001标准，从每种材料制备5个圆形样本（10×1毫米）。材料凝固后，使用咬合片和厚度从2毫米到16毫米不等的带刻度铝阶梯楔进行射线照相。牙科X射线机（GE1000）设置为50千伏峰值、10毫安、18脉冲/秒，距离为33.5厘米。将射线照片数字化，并使用Wixwin - 2000软件（Gendex）将射线不透性与铝阶梯楔进行比较。使用方差分析和Tukey检验分析数据（毫米铝）。
PC + Bi₂O₃和WMTA样本呈现出更高的射线不透性（分别为5.88和5.72毫米铝），其次是PC + ZrO₂（3.87毫米铝）和PC + CHI₃（3.50毫米铝）。PC + BaSO₄和PC样本呈现出最低的射线不透性值（分别为2.35和1.69毫米铝），低于ISO推荐的最小值。
对当前结果的分析得出结论，除了PC + BaSO₄和纯PC外，所有测试材料的射线不透性均可接受。
