Shintcovsk Ricardo Lima, Knop Luegya Amorim Henriques, Gandini Luiz Gonzaga, Martins Lidia Parsekian, Pires Aline Segatto
Department of Pediatric Clinic, School of Dentistry at Araraquara, Universidade Estadual de São Paulo, Araraquara, SP, Brazil.
Department of Dental Materials, School of Dentistry, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
Braz Oral Res. 2015;29. doi: 10.1590/1807-3107BOR-2015.vol29.0022. Epub 2015 Jan 13.
This study aims at comparing conventional and nickel-free metal bracket surface characteristics with elemental composition by scanning electron microscopy (SEM), using energy dispersive spectroscopy (EDS). The sample consisted of 40 lower incisor brackets divided into four groups: ABZ = conventional brackets, Kirium Abzil 3M® (n = 10); RL = conventional brackets, Roth Light Morelli® (n = 10); NF = nickel-free brackets, Nickel-Free Morelli® (n = 10); and RM = nickel-free brackets, Roth Max Morelli® (n = 10). Qualitative evaluation of the bracket surface was performed using SEM, whereby surface features were described and compared. The elemental composition was analyzed by EDS. According to surface analysis, groups ABZ and RL showed a homogeneous surface, with better finishing, whereas the surfaces in groups NF and RM were rougher. The chemical components with the highest percentage were Fe, Cr and C. Groups NF and MR showed no nickel in their composition. In conclusion, the bracket surface of the ABZ and RL groups was more homogeneous, with grooves and pores, whereas the surfaces in groups NF and RM showed numerous flaws, cracks, pores and grooves. The chemical composition analysis confirmed that the nickel-free brackets had no Ni in their composition, as confirmed by the manufacturer's specifications, and were therefore safe to use in patients with a medical history of allergy to this metal.
本研究旨在通过扫描电子显微镜（SEM）并使用能谱仪（EDS），比较传统金属托槽和无镍金属托槽的表面特征及元素组成。样本由40个下颌切牙托槽组成，分为四组：ABZ = 传统托槽，3M® 公司的Kirium Abzil（n = 10）；RL = 传统托槽，Roth Light Morelli®（n = 10）；NF = 无镍托槽，Morelli® 公司的Nickel-Free（n = 10）；RM = 无镍托槽，Roth Max Morelli®（n = 10）。使用SEM对托槽表面进行定性评估，描述并比较表面特征。通过EDS分析元素组成。根据表面分析，ABZ组和RL组表面均匀，光洁度更好，而NF组和RM组表面更粗糙。含量最高的化学成分是铁、铬和碳。NF组和MR组在其组成中未显示出镍。总之，ABZ组和RL组的托槽表面更均匀，有凹槽和孔隙，而NF组和RM组的表面有许多瑕疵、裂纹、孔隙和凹槽。化学成分分析证实，无镍托槽的组成中不含镍，正如制造商的规格所证实的那样，因此对于有该金属过敏病史的患者使用是安全的。
