1997-9-1-14-16 - Saudi Dental Journal

ISSN (Print) 1013-9052
EISSN 1658-3558

The Saudi Dental Journal,
P.O. Box 52500,
Riyadh 11563,
Kingdom of Saudi Arabia

Tel.	966-1-467-7328
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Email	saudidj@ksu.edu.sa

In-Vitro Corrosion Measurements of Ni-Ti Wrought alloys

Salwa E. Khier, BDS, MSD, MSc, PhD*; William A. Brantley, PhD**
*King saud University, P.O.Box 60169, Riyadh 11545, Saudi Arabia
**College of Dentistry, The Ohio State University, Ohio, U.S.A.

Nickel-titanium (Ni-Ti) orthodontic wire alloys are the current focus of intensive research activity. Several new brands have been introduced. These wires are capable of being activated or deactivated at a nearly constant force level. The purpose of this investigation was to characterize the potentiodynamic polarization behavior for various Ni-Ti wire alloys and to compare their in-vitro corrosion. Six different types of Ni-Ti wires were selected, Nitinol SE, Sentinol, NiTi, Tkanal, Orthonol and Nitinol alloys, with cross-section dimensions of: 0.016 and 0.018 inch for round specimens or 0.018x0.025 and 0.021x0.025 inch for rectangular specimens. Specimens were maintained in an artificial saliva which was adjusted to a pH = 6. A 500 m! air-exposed saliva solution was used in a Princeton corrosion cell. The anodic and cathodic polarization experiments were conducted using an Aardvark potentiostat. The potentiodynamic behavior of all six Ni-Ti wires was generally similar. Sentinol, Titanal and Orthonol wires showed breakdown of passive film during testing and the other three wires remained passive over the entire range of the cyclic voltage used.

Saudi Dental Journal 1997;9(1):14-16.