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KMID : 1035320140410010047
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Korean Society for Dental Materials
2014 Volume.41 No. 1 p.47 ~ p.52
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The effect of titanium nitride coating on the fatigue fracture resistance of rotary nickel titanium instruments
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Hwang In-Ja
Yoo Yeon-Jee
Ahn Jin-Soo
Chung Shin-Hye
Kum Kee-Yeon
Lee Yun
Seo Deog-Gyu
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Abstract
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The purpose of this study was to examine the effect of titanium nitride coating treatment on the cyclic fatigue resistance of two nickel-titanium rotary instruments and to examine the coated surface under a scanning electron microscope (SEM). A total of 48 Nickel-titanium files from two brands (K3, SybronEndo, Orange, CA, #25/.06 taper; Helix, Diadent, Daegu, Korea, #30/.06taper) were tested. The experimental group (12 files from each brand was treated with titanium nitride through physical vapor deposition method. No treatment was done to the control group. A Endo Tester (Denbotix, Bucheon, Gyeonggi-do Korea) that simulated actual canal configuration and pecking motion of files allowed the instruments to rotate freely inside and move up and down along the artificial canal. The time it took for the file to fracture was recorded and was multiplied by the revolution per minute to obtain the number of cycles to failure (NCF). SPSS statistical package was used to analyze the results with Mann-Whitney U test. Four files, randomly selected from each group, were examined using under a SEM to examine the surface characteristics. NCF of K3 files coated with titanium nitride decreased significantly. Helix files showed no difference between the experimental and control groups. The presences of titanium nitride coating were observed under SEM. Titanium nitride treatment didn’t significantly improve the fatigue fracture resistance in NiTi rotary files.
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KEYWORD
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cyclic fatigue fracture, fracture resistance, nickel-titanium rotary instrument, surface treatment, titanium nitride
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