title: Effect of acidic fluoride solution on beta titanium alloy wire.
abstract: The interaction between acidic fluoride solution and beta titanium alloy was investigated to explore the changes that occur in beta titanium alloy by fluoride-containing acetic acid solutions. For this, alloy crystal structure, tensile strength, and elements released from the alloy wires were determined using four solutions (0.05%/pH 6, 0.05%/pH 4, 0.2%/pH 6, and 0.2%/pH 4) for 1 or 3 days. The immersed wire did not form any identifiable new crystal structure compared with the as-received wire. The tensile strength of the immersed wires was significantly reduced compared to the as-received wires in the test solutions if the period of immersion increased from as-received to 3 days. The fractured area of the immersed wire was reduced compared to the as-received one. The dimple pattern at the inner part and a cup-cone morphology at the outer part of the fractured wires were similar in both as-received and immersed wires. After a 3-day immersion, the amount of the released Ti and Mo has much increased for higher NaF concentration and lower pH value. During the long-period orthodontic treatment, both patient and clinical doctor should carefully use the fluoride-containing products to minimize unexpected damage on orthodontic wires.
authors.affiliation: Department of Dental Materials, College of Dentistry and Medical Research Institute, Pusan National University, 1-10 Ami-dong Seo-gu, Pusan 602-739, Korea. y0k0916@pusan.ac.kr
authors.forename: Yong Hoon
authors.initials: YH
authors.lastname: Kwon
authors.forename: Hyo-Joung
authors.initials: HJ
authors.lastname: Seol
authors.forename: Hyung-Il
authors.initials: HI
authors.lastname: Kim
authors.forename: Ki-Ju
authors.initials: KJ
authors.lastname: Hwang
authors.forename: Sang-Geul
authors.initials: SG
authors.lastname: Lee
authors.forename: Kyo-Han
authors.initials: KH
authors.lastname: Kim
mesh_terms: D000085:Acetates; D001864:Bone Wires; D003722:Dental Alloys / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D008422:Materials Testing; D008982:Molybdenum; D012969:Sodium Fluoride; D012996:Solutions; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*
chemical_list: D000085:Acetates; D003722:Dental Alloys; D012996:Solutions; C023988:beta titanium; D008982:Molybdenum; D012969:Sodium Fluoride; D014025:Titanium; D005459:Fluorides