Abalos C, Paúl A, Mendoza A, Solano E, Gil F J
Department of Dental Materials, School of Dentistry, University of Seville, Seville, Spain.
J Mater Sci Mater Med. 2011 Dec;22(12):2813-21. doi: 10.1007/s10856-011-4460-y. Epub 2011 Nov 1.
Different manufacturing processes of Ni-Ti archwires respond differently to corrosion due to the surface conditions involved. In this study, several topographical features and their influence upon fluoride corrosion were studied. Four topographies (smooth, dimple, scratch, and crack) according to the main surface defect were characterized (n = 40). Static corrosion tests were performed in artificial saliva with fluorated prophylactic gel (12500 ppm) for 28 days. The surface was characterized by SEM and laser confocal microscopy. Standard electrochemical corrosion (open circuit potential, corrosion potential and corrosion current density) was performed. Statistical analysis was carried out using the ANOVA test (α ≤ 0.05). An increase was observed in the surface defects and/or roughness of the cracked and scratched surfaces. These defects produced an important increase in corrosion behavior. The best surfaces for the orthodontic archwires were the smooth and dimpled surfaces, respectively. The increase in defects was independent of roughness. Manufacturing processes that produce surface cracks should be avoided in orthodontic applications.
由于所涉及的表面状况不同，镍钛弓丝的不同制造工艺对腐蚀的反应也不同。在本研究中，研究了几种表面形貌特征及其对氟腐蚀的影响。根据主要表面缺陷对四种形貌（光滑、凹坑、划痕和裂纹）进行了表征（n = 40）。在含有氟化预防凝胶（12500 ppm）的人工唾液中进行了28天的静态腐蚀试验。通过扫描电子显微镜（SEM）和激光共聚焦显微镜对表面进行了表征。进行了标准电化学腐蚀（开路电位、腐蚀电位和腐蚀电流密度）测试。使用方差分析（ANOVA）检验进行统计分析（α≤0.05）。观察到裂纹和划痕表面的表面缺陷和/或粗糙度有所增加。这些缺陷导致腐蚀行为显著增加。正畸弓丝的最佳表面分别是光滑表面和凹坑表面。缺陷的增加与粗糙度无关。在正畸应用中应避免产生表面裂纹的制造工艺。
