title: Discoloration and dissolution of titanium and titanium alloys with immersion in peroxide- or fluoride-containing solutions.
abstract: This study compared differences in discoloration and dissolution in several titanium alloys with immersion in peroxide- or fluoride-containing solution. Commercially pure titanium (CP-Ti) and six titanium-based alloys were used: Ti-0.15Pd, Ti-6Al-4V, Ti-7Nb-6Al, Ti-55Ni, Ti-10Cu, and Ti-20Cr. Two test solutions were prepared for immersion of polished titanium and titanium alloys: one consisting of 0.2% NaF + 0.9% NaCl (pH 3.8 with lactic acid) and the other of 0.1 mol/l H2O2 + 0.9% NaCl (pH 5.5). Following immersion, color changes were determined with a color meter and released elements were measured using ICP-OES. Discoloration and dissolution rates differed between the two solutions. In the hydrogen peroxide-containing solution, color difference was higher in Ti-55Ni and Ti-6Al-4V than in any of the other alloys, and that Ti-55Ni showed the highest degree of dissolution. In the acidulated fluoride-containing solution, CP-Ti, Ti-0.15Pd, Ti-6Al-4V, Ti-7Nb-6Al, and Ti-10Cu alloys showed remarkable discoloration and dissolution with immersion. On the contrary, Ti-20Cr alloy showed very little discoloration and dissolution in either solution.
authors.affiliation: Department of Dental Materials Science, Tokyo Dental College, 1-2-2 Masago, Mihama-ku, Chiba 261-8502, Japan.
authors.forename: Tatsumi
authors.initials: T
authors.lastname: Noguchi
authors.forename: Shinji
authors.initials: S
authors.lastname: Takemoto
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hattori
authors.forename: Masao
authors.initials: M
authors.lastname: Yoshinari
authors.forename: Eiji
authors.initials: E
authors.lastname: Kawada
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Oda
mesh_terms: D000497:Alloys; D002327:Cariostatic Agents / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry; D003116:Color; D003300:Copper / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007101:Immersion; D019344:Lactic Acid / Q000737:chemistry; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry; D012965:Sodium Chloride / Q000737:chemistry; D012969:Sodium Fluoride / Q000737:chemistry; D012995:Solubility; D014025:Titanium / Q000737:chemistry*
chemical_list: D000497:Alloys; D002327:Cariostatic Agents; D003722:Dental Alloys; D003764:Dental Materials; D016877:Oxidants; D002857:Chromium; C070282:Ti-6Al-7Nb alloy; C040654:titanium nickelide; C031462:titanium alloy (TiAl6V4); D019344:Lactic Acid; D012965:Sodium Chloride; D010165:Palladium; D003300:Copper; D009532:Nickel; D012969:Sodium Fluoride; D006861:Hydrogen Peroxide; D014025:Titanium; D005459:Fluorides