Suzuki Marcelo K, Martins Danielle Ar, Costa Marília T, Ferreira Andreia C, Ferreira Flavio Ac
Department of Orthodontics, Centro Odontologico Saiki Suzuki, Sao Paulo, Brazil, Phone: +551155817241, e-mail:
Department of Orthodontics, Vitae Odontologia, Goiania, Goias, Brazil.
J Contemp Dent Pract. 2018 Aug 1;19(8):910-917.
To evaluate, in vitro, the mini-implant surface changes and the release of ions after immersion in artificial saliva during follow-up of 60 and 120 days.
As for the surface features, examined in a scanning electron microscope (SEM), before and after immersion in artificial saliva, there was a rough and uneven surface, suggestive of corrosion areas for the two trademarks evaluated after 120 days of immersion. The extracts generated in artificial saliva analysis were submitted to energy dispersive spectroscopy to identify the solid corrosion products produced on the surfaces of miniscrews.
Both SIN miniscrews and Neodent brands were observed to release minimal quantities of silver ions, chromium, iron, nickel, titanium, and vanadium. Regarding titanium, this index varied from 88.84% in the control group of Neodent brand, and 91.29% in the control group of SIN brand. For the aluminum content, the quantities ranged from 4.91% in group immersed for 60 days in Neodent brand to 8.71% for the SIN control group. Considering vanadium, the index ranged from 2.65% in the group immersed for 120 days to 4.53% in the control group, both for Neodent brand. Statistically significant differences in iron ion were observed between the control group and the miniscrews brand SIN after 60 and 120 days and for Neodent after 60 days of immersion. The titanium ions suffered statistically significant decrease for both brands after 120 days of storage when compared with the control group.
The studied miniscrews showed results consistent with the biosafety of alloys for use, in vivo.
The knowledge of the physical/chemical state of corrosion products released in the oral cavity is very important for the toxicological assessment of metal alloys used in dental miniscrews.
在体外评估微型种植体在人工唾液中浸泡60天和120天随访期间的表面变化及离子释放情况。
至于表面特征，在扫描电子显微镜（SEM）下观察人工唾液浸泡前后的情况，浸泡120天后评估的两个品牌表面粗糙且不均匀，提示存在腐蚀区域。人工唾液分析产生的提取物进行能谱分析，以鉴定微型螺钉表面产生的固体腐蚀产物。
观察到SIN微型螺钉和Neodent品牌释放的银离子、铬、铁、镍、钛和钒的量极少。关于钛，该指标在Neodent品牌对照组中为88.84%，在SIN品牌对照组中为91.29%。对于铝含量，在Neodent品牌中浸泡60天的组含量范围为4.91%，SIN对照组为8.71%。考虑钒，Neodent品牌浸泡120天的组指标为2.65%，对照组为4.53%。浸泡60天和120天后，SIN微型螺钉品牌对照组与Neodent品牌浸泡60天后的铁离子存在统计学显著差异。与对照组相比，两个品牌在储存120天后钛离子均出现统计学显著下降。
所研究的微型螺钉显示出与体内使用合金的生物安全性一致的结果。
了解口腔中释放的腐蚀产物的物理/化学状态对于牙科微型螺钉中使用的金属合金的毒理学评估非常重要。
