치과교정용 미니나사의 부식특성에 미치는 ZrN 및 TiN코팅영향

Abstract

The dental orthodontic mini-screw requires good mechanical properties and high corrosion resistance for implantation in the bone. The purpose of this study was to investigate the effects of TiN and ZrN coating on corrosion characteristics of orthodontic mini-screws, mini-screws were used for experiment. Ion plating was carried out for mini-screw using Ti and Zr coating materials with nitrogen gas. Ion plated surface of each specimen was observed with field emission scanning electron microscopy(FE-SEM), energy dispersive x-ray spectroscopy(EDX), and electrochemical tester.

The results were as follows.:

1. The surface of TiN and ZrN coated mini-screw were more smooth than that of other kinds of non coated mini-screw due to dercrease of machined defects.

2. The corrosion current density of the TiN and ZrN coated mini-screw decreased compared to non-coated sample. The corrosion potential of TiN and ZrN coated mini-screw were higher than that of non-coated mini-screw in 0.9% NaCl solution.

3. The pitting corrosion resistance increased in the order of ZrN coated, TiN coated and non-coated wire. Pitting potential of ZrN coated mini-screw was the highest in the other specimens.