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Type: Artigo de periódico
Title: Radiodensity evaluation of dental impression materials in comparison to tooth structures
Author: Fonseca, RB
Branco, CA
Haiter-Neto, F
Goncalves, LD
Soares, CJ
Carlo, HL
Sinhoreti, MAC
Correr-Sobrinho, L
Abstract: In the most recent decades, several developments have been made on impression materials' composition, but there are very few radiodensity studies in the literature. It is expected that an acceptable degree of radiodensity would enable the detection of small fragments left inside gingival sulcus or root canals. Objective: The aim of this study was to determine the radiodensity of different impression materials, and to compare them to human and bovine enamel and dentin. Material and Methods: Twenty-five impression materials, from 5 classes, were studied: addition and condensation silicones, polyether, polysulfides and alginates. Five 1-mm-thick samples of each material and tooth structure were produced. Each sample was evaluated 3 times (N=15), being exposed to x-ray over a phosphor plate of Digora digital system, and radiodensity was obtained by the software Digora for Windows 2.5 Rev 0. An aluminum stepwedge served as a control. Data were subjected to Kruskal-Wallis and Dunn's method (alpha=0.05). Results: Different materials and respective classes had a different behavior with respect to radiodensity. Polysulfides showed high values of radiodensity, comparable to human enamel (p>0.05), but not to bovine enamel (p<0.05). Human dentin was similar only to a heavy-body addition silicon material, but bovine dentin was similar to several materials. Generally, heavy-body materials showed higher radiodensity than light-body ones (p<0.05). Conclusion: Impression materials' radiodensity are influenced by composition, and almost all of them would present a difficult detection against enamel or dentin background in radiographic examinations.
Subject: Radiography
Dental impression materials
Human tooth
Bovine tooth
Country: Brasil
Editor: Univ Sao Paulo Fac Odontologia Bauru
Citation: Journal Of Applied Oral Science. Univ Sao Paulo Fac Odontologia Bauru, v. 18, n. 5, n. 467, n. 476, 2010.
Rights: fechado
Identifier DOI: 10.1590/S1678-77572010000500007
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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