Radiographic effect of different radiopacifiers on a potential retrograde filling material

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• 作者：Eduardo Antunes Bortoluzzi ; Juliane Maria Guerreiro-Tanomaru ; Mario Tanomaru-Filho ; Marco Antonio Hungaro Duarte
• 刊名：Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
• 出版年：2009
• 出版时间：October 2009
• 年：2009
• 卷：108
• 期：4
• 页码：628-632
• 全文大小：226 K

文摘

class=""h4"">Objective

The objective of this study was to evaluate the radiopacity of white Portland cement (PC) associated with bismuth oxide (Bi₂O₃), barium sulfate (BaSO₄), iodoform (CHI₃), and zirconium oxide (ZrO₂). White mineral trioxide aggregate (WMTA) and PC without radiopacifier were used as positive and negative controls, respectively.

class=""h4"">Study design

Following International Organization for Standardization (ISO) 6876/2001, 5 circular specimens (10 × 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.

class=""h4"">Results

The PC + Bi₂O₃ and WMTA samples presented greater radiopacity (5.88 and 5.72 mm Al, respectively), followed by PC + ZrO₂ (3.87 mm Al) and PC + CHI₃ (3.50 mm Al). The PC + BaSO₄ 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.

class=""h4"">Conclusion

Analysis of the present results led to the conclusion that all of the materials tested presented acceptable radiopacity, except PC + BaSO₄ and pure PC.