Effect of acidic fluoride solution on beta titanium alloy wire.
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.
Kwon
Yong Hoon
YH
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
Seol
Hyo-Joung
HJ
Kim
Hyung-Il
HI
Hwang
Ki-Ju
KJ
Lee
Sang-Geul
SG
Kim
Kyo-Han
KH
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*
D000085:Acetates; D003722:Dental Alloys; D012996:Solutions; C023988:beta titanium; D008982:Molybdenum; D012969:Sodium Fluoride; D014025:Titanium; D005459:Fluorides