Effect of fluoride released from fluoride-containing dental restoratives on NiTi orthodontic wires.
The present study investigated the effect of fluoride released from dental restoratives on orthodontic NiTi wires. Five different restoratives (four fluoride-containing and one non-fluoride-containing) and four different NiTi wires were examined in this study. The pH of artificial saliva (AS) was adjusted to 2.5 and 6. Content of released fluoride was determined daily for 10 days. The morphology of wires was observed using a scanning electron microscope. After immersion for 10 days, the initial microhardness of the wires decreased by 0.3-5.6% depending on the test solution. Dyract AP (DA) and F2000 (F2) (compomers) released significantly more fluoride than the other resin products (composite resins) regardless of the test solution. In pH 2.5 solution, both DA and F2 released 40-45 ppm/day fluoride for five to six days. As for the wires in contact, they did not show any visible modification in surface morphology. Therefore, despite the released fluoride, wires in contact with the fluoride-containing restoratives were not damaged regardless of the pH value of test solution.
Kwon
Yong Hoon
YH
Department of Dental Materials, College of Dentistry and Medical Research Institute, Pusan National University, Busan 602-739, Korea. y0k0916@pusan.ac.kr
Jang
Chang-Min
CM
Jang
Jae-Hyeok
JH
Park
Joo-Hee
JH
Kim
Tae-Hyong
TH
Kim
Hyung-Il
HI
D000497:Alloys / Q000737:chemistry; D002327:Cariostatic Agents / Q000737:chemistry*; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D005459:Fluorides / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry; D006244:Hardness; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D009969:Orthodontic Wires; D012464:Saliva, Artificial / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*
D000497:Alloys; D002327:Cariostatic Agents; D020770:Compomers; D003188:Composite Resins; C415948:Copper NiTi; D003722:Dental Alloys; D003764:Dental Materials; C088486:Dyract; C118368:F2000 cement; C444701:Filtek Z250; D005899:Glass Ionomer Cements; D012464:Saliva, Artificial; C403464:SureFil packable composite; C121818:Tetric ceram; C040654:titanium nickelide; C013616:nitinol; D003300:Copper; D009532:Nickel; D014025:Titanium; D005459:Fluorides