TY - GEN
T1 - Effect of direct electric resistance heat treatment on mechanical properties of NiTi orthodontic arch wires
AU - Kiattiwongse, W.
AU - Khantachawana, A.
AU - Santiwong, P.
PY - 2008
Y1 - 2008
N2 - Two types of rectangular orthodontic archwires; NiTi™ and 40°CuNiTi, were heat treated by Direct Electric Resistance Heat Treatment (DERHT) using different electric currents for 4 s. Their mechanical properties were then evaluated by micro hardness and three-point bending tests. After applying 4.5-5.5 A current, the hardness of NiTi™ increased with the increased current, whereas the change in hardness of 40°CuNiTi was slight. When 6 A current was applied, the hardness of the midspan of both wires significantly decreased. From the three-point bending test, unloading forces of NiTi™ increased after treating with 5.5 A current, while those of 40°CuNiTi decreased. However, both specimens lost their superelasticity when applied with 6 A current. In conclusion, after DERHT, various changes in mechanical properties can be noted in the different types of nickel titanium archwire.
AB - Two types of rectangular orthodontic archwires; NiTi™ and 40°CuNiTi, were heat treated by Direct Electric Resistance Heat Treatment (DERHT) using different electric currents for 4 s. Their mechanical properties were then evaluated by micro hardness and three-point bending tests. After applying 4.5-5.5 A current, the hardness of NiTi™ increased with the increased current, whereas the change in hardness of 40°CuNiTi was slight. When 6 A current was applied, the hardness of the midspan of both wires significantly decreased. From the three-point bending test, unloading forces of NiTi™ increased after treating with 5.5 A current, while those of 40°CuNiTi decreased. However, both specimens lost their superelasticity when applied with 6 A current. In conclusion, after DERHT, various changes in mechanical properties can be noted in the different types of nickel titanium archwire.
KW - Heat treatment
KW - Nickel titanium alloy
KW - Orthodontic archwire
KW - Surface hardness
KW - Three-point bending test
UR - http://www.scopus.com/inward/record.url?scp=62949105513&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/amr.55-57.249
DO - 10.4028/www.scientific.net/amr.55-57.249
M3 - Conference contribution
AN - SCOPUS:62949105513
SN - 0878493565
SN - 9780878493562
T3 - Advanced Materials Research
SP - 249
EP - 252
BT - Smart Materials - International Conference on Smart Materials Smart/Intelligent Materials and Nanotechnology, (Smartmat-'08) and the 2nd International Workshop on Functional Materials and Nanomaterial
PB - Trans Tech Publications
T2 - International Conference on Smart Materials-Smart/Intelligent Materials and Nano Technology, (SmartMat-'08) and 2nd International Workshop on Functional Materials and Nanomaterials (IWOFM-2)
Y2 - 22 April 2008 through 25 April 2008
ER -