Metal release from simulated fixed orthodontic appliances
Metal release from simulated fixed orthodontic appliances
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DOI：
10.1067/mod.2001.117911
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发表时间：
2001-10-01
影响因子：
3
通讯作者：
Cha, JY
中科院分区：
文献类型：
--
作者：
Hwang, CJ;Shin, JS;Cha, JY
大多数正畸矫治器和弓丝都是不锈钢或镍钛合金，可以释放金属离子，唾液作为介质。为了测量从目前使用的固定正畸矫正器释放的金属，我们制作了对应于上颌牙弓一半的模拟固定正畸矫正器，并将其浸泡在50 mL人工唾液（pH 6.75 +/- 0.15，37 degreesC）中3个月。我们使用了由Tomy（日本东京）制造的支架、管和带。根据矫治器制造商和0.016 x 0.022英寸弓丝中的金属类型分为四组。A组和B组分别为Ormco（Glendora，Calif）和Dentaurum（伊斯普林根，德国）的不锈钢弓丝，C组和D组均为镍钛弓丝，分别为Ormco的铜镍钛合金和Tomy的Bioforce sentalloy。将不锈钢弓丝在电炉中在500 ℃下热处理1分钟并在水中淬火。我们通过浸泡时间测量了从每组中释放的金属量。结果表明：（1）A组、B组、C组和D组在4周、2周、3周和8周后铬的释放量均无增加，（2）A组在2周、B组在3天、C组在7天和D组在3周后镍的释放量均无增加; A组2周后、B组3天后、C组和D组1天后的铁释放量均无增加。在我们长达3个月的调查中，我们看到随着浸泡时间的增加，金属释放量减少。
Most orthodontic appliances and archwires are stainless steel or nickel-titanium (NiTi) alloys that can release metal ions, with saliva as the medium. To measure metal released from the fixed orthodontic appliances currently in use, we fabricated simulated fixed orthodontic appliances that corresponded to half of the maxillary arch and soaked them in 50 mL of artificial saliva (pH 6.75 +/- 0.15, 37 degreesC) for 3 months. We used brackets, tubes, and bands made by Tomy (Tokyo, Japan). Four groups were established according to the appliance manufacturer and the type of metal in the .016 x .022-in archwires. Groups A and B were stainless steel archwires from Ormco (Glendora, Calif) and Dentaurum (Ispringen, Germany), respectively, and groups C and D were both NiTi archwires with Ormco's copper NiTi and Tomy's Bioforce sentalloy, respectively. Stainless steel archwires were heat treated in an electric furnace at 500 degreesC for 1 minute and quenched in water. We measured the amount of metal released from each group by immersion time. Our conclusions were as follows: (1) there was no increase in the amount of chromium released after 4 weeks in group A, 2 weeks in group B, 3 weeks in group C, and 8 weeks in group D; (2) there was no increase in the amount of nickel released after 2 weeks in group A, 3 days in group B, 7 days in group C, and 3 weeks in group D; and (3) there was no increase in the amount of iron released after 2 weeks in group A, 3 days in group B, and 1 day in groups C and D. In our 3-month-long investigation, we saw a decrease in metal released as immersion time increased.