Radiodensity of base, liner and luting dental materials

Abstract

The aim of this study was to determine the radiodensity of base, liner and luting dental materials and to compare them with human enamel and dentin. Four classes of materials were examined: conventional glass ionomers (CG)-Vitro Cem, Ketac Bond, Vidrion F, Vidrion C; resin-modified glass ionomers (RMGI)-Fuji II LC, Vitrebond; resinous cement (RC)-Rely-X ARC; and zinc phosphate cement (ZP)-Cimento LS. Five 2-mm-thick standard samples of each material and five 2-mm-thick enamel and dentin samples were produced. An aluminum step wedge served as control. Samples were positioned over a phosphor plate of Digora digital system, exposed to X-ray, and the radiodensity obtained in the software Digora for Windows 2.0. Data were submitted to Kruskal-Wallis and Dunnett multiple comparisons test (alpha=0.05). According to statistical analysis, the following sequence in degree of radiodensity could be seen among the groups: Cimento LS (ZP) > Vitro Cem (CG) = Fuji II LC (RMGI) = Rely-X ARC (RC) = Vitrebond (RMGI) > Ketac Bond (CG) > enamel = Vidrion F (CG) > Vidrion C (CG) = dentin. The presence of radiopaque fillers such as zinc, strontium, zirconium, barium, and lanthanium rather than material type seems to be the most important factor when analyzing material radiodensity. Almost all investigated materials presented an accepted radiodensity.

Radiopacity of conventional, resin-modified glass ionomer, and resin-based luting materials

“…Unfortunately, however, incorporation of alumino silicate glass alone makes glass ionomer materials radiolucent (2,6,7). The manufacturers currently employ various radiopaque glasses, i.e., barium (atomic number 56) or strontium (atomic number 38) glass, as powder components of glass ionomers (11). The glass ionomer materials evaluated in this study contain alumino silicate with barium or strontium, and the amount of these radiopaque elements may affect the radiopacity value of the material (11).…”

“…A growing number of luting materials categorized as acrylic resins as well as resin-modified glass ionomers have recently been introduced because of their improved bonding characteristics. However, only limited information is available about the radiographic properties of currently available luting materials (10)(11)(12). In this study we determined the radiopacity values of various luting materials, and compared them with those of enamel and dentin, in order to improve the diagnostic accuracy of dental radiographs taken together with existing luting materials.…”

Radiopaque dental adhesives: Dispersion of flame-made Ta2O5/SiO2 nanoparticles in methacrylic matrices

“…Low Ta 2 O 5 contents (35 wt.%, untreated, 72% Al) resulted in radiopacities below those of dentin (125% Al) and enamel (160% Al). 50 Increasing Ta 2 O 5 contents resulted in higher radiopacities than those of dental hard tissue. Since the attenuation coefficient of Ta 2 O 5 (0.86 m 2 /kg) 51 is higher than that of SiO 2 (0.022 m 2 /kg) 52 at 70 keV energy, the radiopacity is determined by the Ta 2 O 5 content.…”

Animal Study and Pre-clinical Trials of Biomaterials

“…Peri-implant on the implant side and tissue side as interfaces also can be the image by previous imaging system. Several approaches are performed by adjusting the modality from diagnostic tool that exists to access and create the image of interface area reaction like USG (Huang et al 2007;Nishii et al 2012;Noviana et al 2013b), radiodensity (Baena et al 2013;Fonseca et al 2006), and histology (Sennerby et al 2005).…”