Poosti Maryam, Rad Hossein Pezeshki, Kianoush Kamyar, Hadizadeh Behzad
Orthodontic Department, School of Dentistry and Dental Research Center, Mashhad University of Medical Sciences, Iran.
Aust Orthod J. 2009 May;25(1):30-3.
Increased concentrations of nickel ions may be released into saliva from recycled NiTi archwires.
To compare the nickel ion concentrations released from recycled NiTi wires after sterilisation by either dry heat or steam autoclave.
Eighty preformed NiTi wires were assigned to four equal groups. In Groups 1, 2 and 3 the archwires were used intra-orally for 4 weeks. The Group 4 archwires were not used. Group 1 archwires were sterilised by dry heat, the Group 2 archwires were sterilised by steam autoclave, the Group 3 archwires were not sterilised and the Group 4 archwires were as-received. A 2 cm length, cut from each archwire, was immersed in artificial saliva for 4 weeks and the nickel ion concentrations in the artificial saliva measured with an atomic absorption spectrophotometer.
There were no significant differences in the nickel ion concentrations released into the artificial saliva by each group of archwires (p = 0.467).
Sterilisation of used NiTi wires by either dry heat and steam autoclave does not affect the concentrations of nickel ions released into artificial saliva.
回收的镍钛弓丝可能会向唾液中释放更高浓度的镍离子。
比较经干热或蒸汽高压灭菌后回收的镍钛丝释放的镍离子浓度。
将80根预制镍钛丝分为四组，每组数量相等。第1、2和3组的弓丝在口腔内使用4周，第4组的弓丝未使用。第1组弓丝采用干热灭菌，第2组弓丝采用蒸汽高压灭菌，第3组弓丝未灭菌，第4组弓丝保持原样。从每根弓丝上截取2 cm长的一段，浸入人工唾液中4周，并用原子吸收分光光度计测量人工唾液中的镍离子浓度。
每组弓丝释放到人工唾液中的镍离子浓度无显著差异（p = 0.467）。
使用过的镍钛丝经干热和蒸汽高压灭菌均不影响释放到人工唾液中的镍离子浓度。
