Evaluation of the gray-scale values of glass ionomer cement in indirect digital imaging
DOI:
https://doi.org/10.7308/aodontol/2012.48.2.01Keywords:
Glass ionomer cements, Radiography dental digitalAbstract
Aim: To compare the radiopacity of four glass ionomer cements by measuring their gray values in digital images obtained through the indirect method.
Materials and Methods: Five specimens were prepared at thicknesses of 1, 2, 3, and 4mm of the following materials: Magic Glass® R, Maxxion® R, Vidrion® R, and Chemflex® The samples were separated by brand and thickness, and radiographies were taken following a standardized technique. Three radiographs were performed by thickness for each evaluated material. The images were then digitalized and analyzed using the histogram tool of Adobe Photoshop 8.0 to determine the gray levels. For this, three readings were taken in different areas of each sample prepared for each thickness of each evaluated brand. The values obtained were subsequently subjected to an arithmetic mean, and the results were expressed as mean gray levels for each material thickness. Data were analyzed by ANOVA and Bonferroni assays (p<0.05).
Results: All thickness sealers presented statistically significant differences when compared to each other for the same material (p<0.001). In addition, the mean gray levels increased in direct proportion with the thicknesses of the specimens. The mean gray levels found in each sealer, for the same thickness, proved to be different, with statistically significant results (p<0.001).
Conclusion: The data revealed that Chemflex® presented the highest mean gray levels and radiopacity of all materials tested.
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References
Queiroz VAO. Uso do cimento ionômero de vidro na prática odontológica [dissertação]. Bauru (SP): Faculdade de Odontologia de Bauru da USP; 2003.
Giovannini JBG. Influência da energia de manipulação na propriedade de um cimento polialcenoato de vidro encapsulado para cimentação [dissertação]. Belo Horizonte (MG): Faculdade de Odontologia da UFMG; 2002.
Sidhu SK. Glass-ionomer cement restorative materials: a sticky subject? Aust Dent J. 2011; 56:23-30.
Loguercio AD, Reis A, Bauer JRO, Rodrigues Filho RE, Busato ALS. Avaliação da radiopacidade de resinas compostas indicadas para dentes posteriores. Passo Fundo. 2001; 6:49-52.
Ergucu Z, Turkun LS, Onem E, Guneri P. Comparative radiopacity of six flowable resin composites. Oper Dent. 2010; 35:436-40.
Tsuge T. Radiopacity of conventional resin- modified glass-ionomer and resin-based luting materials. J Oral Sci. 2009; 51:223-30.
Souza FCPP, Pardini LC, Cruvinel DR, Hamida HM, Garcia LFR. In vitro comparison of the radiopacity of cavity lining materials with human dental structures. J Conserv Dent. 2010; 13:65-70.
Dutra GMC, Wienandts, P, Costa NP, Araújo FB. Avaliação da densidade óptica da superfície oclusal através de radiografias digitalizadas e sua relação com a presença de lesões de cárie em molares decíduos. Rev Odonto Ciênc. 2007; 22:222-7.
Aznar FDC, Bueno CES, Nishiyama CK, Martin AS. Radiopacidade de sete cimentos endodônticos avaliada através de radiografia digital. Rev Gaucha Odontol. 2010; 58:181-4.
Bagatini L, Hehn L, Fontanella V. Avaliação da densidade óptica de três cimentos de ionômero de vidro associados à estrutura dental. Rev Fac Odontol Porto Alegre. 2004; 45:6-10.
Hehn L, Mahl CRW, Freitas MPM, Conde A, Veeck EB, Fontanella V. Comparação de três sistemas digitais em relação à densidade óptica de cimentos de ionômero de vidro. Rev Odonto Ciênc. 2007; 22:233-7.
Williams JA, Billington RW. The radiopacity of glass ionomer dental materials. J Oral Rehabil. 1990; 17:245-8.
Skartveit L, Halse A. Radiopacity of glass ionomer materials. J Oral Rehabil. 1996; 23:1-4.
Gegler A, Cruz AT, Barbisan AO, Pacheco JFM, Fontanella V. Radiopacidade de ionômeros de vidro. Rev Fac Odontol Porto Alegre. 1999; 40:19- 24.
Baksi BG, Ermis RB. Comparison of conventional and digital radiography for radiometric differentiation of dental cements. Quintessence Int. 2007; 38:532-6.
