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Effect of pH and temperature on orthodontic NiTi wires immersed in acidic fluoride solution
Author(s) -
Ahn HyungSoo,
Kim MyongJin,
Seol HyoJoung,
Lee JungHyun,
Kim HyungIl,
Kwon Yong Hoon
Publication year - 2006
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.30505
Subject(s) - hydrofluoric acid , corrosion , chemistry , acetic acid , indentation hardness , immersion (mathematics) , fluoride , materials science , nickel titanium , inorganic chemistry , nuclear chemistry , metallurgy , microstructure , organic chemistry , mathematics , pure mathematics , shape memory alloy
Abstract Orthodontic arch wires can confront diverse pH and temperature conditions in the oral cavity after replacement. The current study evaluated the effect of pH and temperature on orthodontic NiTi arch wires after immersion in an acidic fluoride solution. The acetic acid added for the adjustment of pH forms hydrofluoric acid (HF). More HF was formed in a solution of lower pH with higher temperature than that of the higher pH with lower temperature. Within the same pH value, the temperature of the solution affected the concentration of HF. Each as‐received wire exhibited quite different microhardness values. The reduction of microhardness, 1.2–5.7%, occurred after immersion. Within the same product, however, the pH and temperature had minor influence on the reduction. The volumetric weight change, concentration of the released elements, and surface morphology were influenced by pH and temperature. At pH 3.5 of 60°C solution, the greatest weight loss, release of elements, and corrosion of surface occurred from the wires. At pH 6, on the other hand, no such loss or release occurred regardless of temperature. At 5°C solution, the surface exhibited minor corrosion regardless of pH value. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2006