Reliability performance of titanium sputter coated Ni-Ti arch wires: mechanical performance and nickel release evaluation.
The present research was aimed at developing surface coatings on NiTi archwires capable of protection against nickel release and to investigate the stability, mechanical performance and prevention of nickel release of titanium sputter coated NiTi arch wires. Coated and uncoated specimens immersed in artificial saliva were subjected to critical evaluation of parameters such as surface analysis, mechanical testing, element release, friction coefficient and adhesion of the coating. Titanium coatings exhibited high reliability on exposure even for a prolonged period of 30 days in artificial saliva. The coatings were found to be relatively stable on linear scratch test with reduced frictional coefficient compared to uncoated samples. Titanium sputtering adhered well with the Ni-Ti substrates at the molecular level, this was further confirmed by Inductive coupled plasma emission spectroscopy (ICPE) analysis which showed no dissolution of nickel in the artificial saliva. Titanium sputter coatings seem to be promising for nickel sensitive patients. The study confirmed the superior nature of the coating, evident as reduced surface roughness, friction coefficient, good adhesion and minimal hardness and elastic modulus variations in artificial saliva over a given time period.
Department of Orthodontics, Sree Anjaneya Institute of Dental Sciences, Calicut 673315, India.
P
P
Anuradha
Department of Orthodontics, Amrita School of Dentistry, Kochi 682041, India.
N K Sapna
NK
Varma
Technocommercial Innovation Center, English Indian Clay limited, Trivandrum 695021, India.
Avinash
A
Balakrishnan
D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis*; D019245:Compressive Strength; D003343:Corrosion; D017267:Dental Prosthesis Design; D004058:Diffusion; D019544:Equipment Failure Analysis; D017276:Friction; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D009532:Nickel / Q000737:chemistry* / Q000302:isolation & purification; D009969:Orthodontic Wires; D015203:Reproducibility of Results; D012463:Saliva / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*
D020099:Coated Materials, Biocompatible; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium
Ni allergy; NiTi alloy; nanoindentation; sputtering; titanium