title: Radiopacity Measurement of Restorative Resins Using Film and Three Digital Systems for Comparison with ISO 4049: International Standard.
abstract: This study compared Ultra Speed Occlusal Film (USOF) and 3 digital systems in determining the radiopacity of 5 different restorative resins in terms of equivalents of aluminum thickness. Whether those digital systems could be used to determine whether radiopacity was in line with International Organization for Standardization (ISO) recommendations was also investigated. Disks of each of 5 restorative resins and an aluminum step wedge were exposed at 65 kVp and 10 mA on USOF and imaged with each digital system. Optical density on the film was measured with a transmission densitometer and the gray values on the digital images using Image J software. Graphs showing gray value/optical density to step wedge thickness were constructed. The aluminum equivalent was then calculated for all the resins using a regression equation. All the resins were more radiopaque than 1 mm of aluminum, and therefore met the ISO 4049 recommendations for restorative resins. Some resins showed statistically higher aluminum equivalents with digital imaging. The use of traditional X-ray films is declining, and digital systems offer many advantages, including an easy, fast, and reliable means of determining the radiopacity of dental materials.
authors.affiliation: Division of Radiology, Department of Oral Diagnostic Sciences, Showa University School of Dentistry.
authors.forename: Rishabh
authors.initials: R
authors.lastname: Kapila
authors.forename: Yukiko
authors.initials: Y
authors.lastname: Matsuda
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Araki
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Okano
authors.forename: Keiichi
authors.initials: K
authors.lastname: Nishikawa
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Sano
mesh_terms: D003188:Composite Resins; D003764:Dental Materials; D006801:Humans; D019252:Radiography, Dental, Digital; D014962:X-Ray Film
chemical_list: D003188:Composite Resins; D003764:Dental Materials