A new assessment methodology to evaluate the radiopacity of endodontic filling materials
AbstractObjective: To evaluate the radiopacity of endodontic filling materials using a new experimental in vitro model. Methods: To prevent the overlapping of tissues and anatomical structures, a tissue simulator block was created. Gutta-percha, Resilon cones and polyethylene tubes filled with Epiphany, AH Plus and EndoFill (n=5 of each material) were placed inside the root canal of a tooth positioned in the simulator and radiographed after setting. Five sealer samples were prepared in standard discs and radiographed after setting. The films were processed and digitized. The digital images were analyzed using Adobe Photoshop® software; the grayscale values (0 to 256 pixels) were compared using Wilcoxon and Mann-Whitney tests (P<0.05) for the cones and ANOVA, Tukey, independent and dependent t tests (P<0.05) for the sealers. Results: In the simulator, AH Plus and Epiphany behaved similarly, presenting higher gray values than those presented by Endofill. In the standard discs, AH Plus was the most radiopaque, followed by Epiphany and Endofill. Resilon presented with higher radiopacity than did gutta-percha, while both were higher than dentin was. Conclusion: All endodontic filling materials presented higher gray values than dentin did, allowing them to be distinguished from the tooth and its surrounding structures. The proposed methodology can be used for the assessment of the radiopacity of endodontic filling materials.
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