Resumo

MESTRE, Karina Monteleone Lachowski et al. The absence of radiopacity of some glass ionomer cements. Rev. Assoc. Paul. Cir. Dent. [online]. 2012, vol.66, n.1, pp. 24-29. ISSN 0004-5276.

The radiopacity is an essential prerequisite for materials used as a base liner and restorations and allows the professional to identify the presence of the material allowing the differentiation from the adjacent tooth structure. Objectives: The aim of this study was to evaluate the radiopacity of base and liner materials available for clinical use and compare to the radiopacity of enamel and dentin. Materials and methods: 13 glass ionomer cements, one resin composite and one amalgam were evaluated. Three specimens with 1 mm thickeness for each glass ionomer cement and restorative material were prepared. Cross section was made from a third molar dental crown to obtain enamel and dentin specimen with thickness of 1 mm. Radiographs were taken with digital system Kodak RVG 5000 and exposure time of 0.32 seconds. The images were analysed through the programe Image Tool® to obtain the mean grey values. Statistical test ANOVA followed by Tukey test (p<0.05) detected considerable differences. Results: Some glass ionomer cements presented radiopacity lower than dentin, considered insufficient for a correct radiographic diagnosis, according to ISO 9917. Conclusion: It was concluded that some base and liner materials available for purchase have an inadequaderadiopacity to be detected radiographically.

Palavras-chave : radiography, dental, digital; glass ionomer cements; dental restoration failure; dentin.