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Effect of acidic fluoride solution on beta titanium alloy wire.
Yong Hoon Kwon1, Hyo-Joung Seol, Hyung-Il Kim
1Department 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
Summary
Acidic fluoride solutions significantly reduce beta titanium alloy tensile strength and increase Ti and Mo release, especially at higher concentrations and lower pH. Careful use of fluoride products during orthodontic treatment is advised to prevent wire damage.
Area of Science:
- Biomaterials Science
- Materials Science
- Orthodontics
Background:
- Beta titanium alloys are widely used in orthodontics due to their favorable mechanical properties.
- Fluoride-containing solutions are common in oral environments and may interact with orthodontic materials.
Purpose of the Study:
- To investigate the effects of acidic fluoride solutions on the properties of beta titanium alloy.
- To evaluate changes in crystal structure, tensile strength, and ion release.
Main Methods:
- Beta titanium alloy wires were immersed in four different fluoride-containing acetic acid solutions (varying NaF concentration and pH) for 1 or 3 days.
- Crystal structure, tensile strength, and released elements (Ti, Mo) were analyzed.
Main Results:
- No new crystal structures were formed on the immersed wires.
- Tensile strength significantly decreased with increased immersion time (up to 3 days).
- Higher NaF concentration and lower pH led to increased release of titanium (Ti) and molybdenum (Mo) after 3 days.
Conclusions:
- Acidic fluoride solutions can negatively impact beta titanium alloy properties, primarily by reducing tensile strength and increasing ion release.
- Clinicians and patients should exercise caution when using fluoride products during prolonged orthodontic treatment to avoid adverse effects on alloy wires.