Abstract

GOMES, Giovana Mongruel et al. Comparison of radiopacity in luting resin cements using conventional and digital radiographic systems. RGO, Rev. gaúch. odontol. (Online) [online]. 2011, vol.59, n.3, pp. 425-4429. ISSN 1981-8637.

Objective To evaluate the radiopacity of three different resin composite luting cements using the histogram method (conventional radiography) and pixel counting method (digital radiography). Methods Fifteen specimens were divided into 3 different resin composite luting cement groups: G-I) Cement-Post (Ângelus®, Londrina, Brazil), G-II) RelyX ARC (3MESPE, St. Paul, Minnesota, USA) and G-III) Variolink II (Ivoclar/Vivadent, Schaan, Liechtenstein). After 24 hours, conventional x-rays of the specimens were taken with a lead gauge, making a visual evaluation by scores, to classify the specimen's radiopacity according to the scale shade (control); they were then scanned for the purposes of analyzing the histogram using Adobe Photoshop CS2, version 8.0. Using the same specimens, x-rays were taken using a Digital X-RAY Intra-Oral System (Gnatus DSR, Ribeirão Preto, Brazil). In this case, the capture of the digital images was performed using Cygnus Imaging® software and the digital radiopacity was measured by counting pixels, using the Image Tool® software (UTHSCSA). Results The non-parametric Kruskal-Wallis test and Dunn's post-test (p<0.05) showed that the means and respective standard deviation percentages of white pixels in the digital x-rays were: G-I) 48.94 ±3.16, G-II) 60.22 ±3.86 and G-III) 69.36 ±5.32. As for the conventional x-rays, the means and standard deviations of the histogram analyses that evaluated gray tones were: G-I) 71.98 ±13.02; G-II) 85.40 ±4.47; G-III) 130.51 ±5.82.

Keywords : Cementation.; Dental cements.; X-Rays..