title: Radiopacity of experimental composite resins containing radiopaque materials.
abstract: This study aimed to investigate the relationship between the radiopacity of an experimental light-cured composite resin and the amount and type of its radiopaque material: Ti, SrCO3, ZrO2, BaSO4, or Bi2O3. Radiopacity of each material was evaluated in terms of aluminum equivalent thickness using an aluminum step wedge. Then, the half-value layer thickness of the experimental composite resin, which had an aluminium equivalent thickness of 1 mm, was evaluated. It was found that the effects of elemental composition were not identical when evaluated in terms of aluminum equivalent thickness and by half-value layer. Nevertheless, both measurement methods indicated that radiopacity increased with increase in radiopaque material content as well as increase in atomic number of the element.
authors.affiliation: Advanced Biomaterials, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, Yushima 1-5-45, Bunkyo-ku, Tokyo 113-8549, Japan. aoyagi.abm@tmd.ac.jp
authors.forename: Yujin
authors.initials: Y
authors.lastname: Aoyagi
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Takahashi
authors.forename: Naohiko
authors.initials: N
authors.lastname: Iwasaki
authors.forename: Ei-ichi
authors.initials: E
authors.lastname: Honda
authors.forename: Toru
authors.initials: T
authors.lastname: Kurabayashi
mesh_terms: D015502:Absorptiometry, Photon; D001466:Barium Sulfate / Q000737:chemistry; D001729:Bismuth / Q000737:chemistry; D002254:Carbonates / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003188:Composite Resins / Q000737:chemistry*; D003287:Contrast Media / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D019163:Reducing Agents / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013324:Strontium / Q000737:chemistry; D013729:Terpenes / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
chemical_list: D002254:Carbonates; D003188:Composite Resins; D003287:Contrast Media; D003764:Dental Materials; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D019163:Reducing Agents; D013729:Terpenes; C029824:urethane dimethacrylate luting resin; C020946:triethylene glycol dimethacrylate; D001466:Barium Sulfate; D011092:Polyethylene Glycols; C054286:strontium carbonate; C048339:camphoroquinone; D012822:Silicon Dioxide; C033301:bismuth oxide; D015040:Zirconium; D014025:Titanium; C049840:2-(dimethylamino)ethyl methacrylate; C028541:zirconium oxide; D001729:Bismuth; D013324:Strontium