Nickel release from orthodontic retention wires-The action of mechanical loading and pH

作者：Milheiro Ana^*; Kleverlaan Cornelis; Muris Joris; Feilzer Albert; Pallav Prem

来源：Dental Materials, 2012, 28(5): 548-553.

DOI：10.1016/j.dental.2011.12.009

• Nickel
• Allergy
• Orthodontics
• Retention wires
• Corrosion
• Metal ion release

Nickel (Ni) is a potent sensitizer and may induce innate and adaptive immune responses. Ni is an important component of orthodontic appliances (8-50 wt%). Due to chemical and mechanical factors in the oral environment, Ni is released from these appliances. Retention wires are in situ for a long period of time. %26lt;br%26gt;Objectives. To quantitatively evaluate the influence of mechanical loading and pH on the nickel release from orthodontic retention wires. %26lt;br%26gt;Methods. Five different types of multi-stranded wires (Original Wildcat, Noninium, Lingual retainer, Dentaflex 3-s, Dentaflex 6-s), were submersed for 24 h in either 10 ml of distilled water or lactic acid, both submitted to cyclic loading in a 3-point bending test (0x, 1000x, 10,000x). The solutions were analyzed by Inductively Coupled Plasma Mass Spectroscopy (ICP-MS), and the data was statistically analyzed (ANOVA, p %26lt; 0.05). %26lt;br%26gt;Results. Mechanical loading has a strong effect on the Ni release from orthodontic retention wires, especially in distilled water. Acidity has more impact on Ni release when compared to mechanical loading. Manganese-steel %26quot;Ni-free%26quot; wires released quantifiable amounts of Ni due to trace elements of Ni within the wire. %26lt;br%26gt;Significance. All investigated wires release considerable amounts of Ni to which exposure may have biological implications.

• 出版日期2012-5