Matias Murilo, Freitas Marcos Roberto de, Freitas Karina Maria Salvatore de, Janson Guilherme, Higa Rodrigo Hitoshi, Francisconi Manoela Fávaro
Departamento de Odontopediatria, Ortodontia e Saúde Coletiva, Faculdade de Odontologia de Bauru, Universidade de São Paulo, Bauru, São Paulo, Brasil.
Departamento de Ortodontia, Faculdade Ingá, Maringá, Paraná, Brasil.
J Appl Oral Sci. 2018;26:e20170220. doi: 10.1590/1678-7757-2017-0220. Epub 2018 Feb 8.
Coated archwires and ceramic brackets have been developed to improve facial esthetics during orthodontic treatment. However, their mechanical behavior has been shown to be different from metallic archwires and brackets. Therefore, the aim of this study was to compare the deflection forces in coated nickel-titanium (NiTi) and esthetic archwires combined with ceramic brackets. Material and Methods Non-coated NiTi (NC), rhodium coated NiTi (RC), teflon coated NiTi (TC), epoxy coated NiTi (EC), fiber-reinforced polymer (FRP), and the three different conventional brackets metal-insert polycrystalline ceramic (MI-PC), polycrystalline ceramic (PC) and monocrystalline ceramic (MC) were used. The specimens were set up on a clinical simulation device and evaluated in a Universal Testing Machine (Instron). An acrylic device, representative of the right maxillary central incisor was buccolingually activated and the unloading forces generated were recorded at 3, 2, 1 and 0.5 mm. The speed of the testing machine was 2 mm/min. ANOVA and Tukey tests were used to compare the different archwires and brackets. Results The brackets presented the following decreasing force ranking: monocrystalline, polycrystalline and polycrystalline metal-insert. The decreasing force ranking of the archwires was: rhodium coated NiTi (RC), non-coated NiTi (NC), teflon coated NiTi (TC), epoxy coated NiTi (EC) and fiber-reinforced polymer (FRP). At 3 mm of unloading the FRP archwire had a plastic deformation and produced an extremely low force in 2; 1 and 0.5 mm of unloading. Conclusion Combinations of the evaluated archwires and brackets will produce a force ranking proportional to the combination of their individual force rankings.
为了在正畸治疗期间改善面部美观，人们研发了涂层弓丝和陶瓷托槽。然而，已表明它们的力学行为与金属弓丝和托槽不同。因此，本研究的目的是比较涂层镍钛（NiTi）弓丝和美观弓丝与陶瓷托槽组合时的挠曲力。材料与方法 使用未涂层的NiTi（NC）、镀铑NiTi（RC）、涂覆聚四氟乙烯的NiTi（TC）、涂覆环氧树脂的NiTi（EC）、纤维增强聚合物（FRP），以及三种不同的传统托槽，即金属嵌入多晶陶瓷（MI-PC）、多晶陶瓷（PC）和单晶陶瓷（MC）。将样本安装在临床模拟装置上，并在万能试验机（英斯特朗）中进行评估。对一个代表右上颌中切牙的丙烯酸装置进行颊舌向激活，并记录在3、2、1和0.5毫米处产生的卸载力。试验机的速度为2毫米/分钟。使用方差分析和Tukey检验来比较不同的弓丝和托槽。结果 托槽呈现出以下递减的力排序：单晶、多晶和金属嵌入多晶。弓丝的递减力排序为：镀铑NiTi（RC）、未涂层NiTi（NC）、涂覆聚四氟乙烯的NiTi（TC）、涂覆环氧树脂的NiTi（EC）和纤维增强聚合物（FRP）。在卸载3毫米时，FRP弓丝发生塑性变形，并且在卸载2、1和0.5毫米时产生极低的力。结论 所评估的弓丝和托槽的组合将产生与它们各自力排序组合成比例的力排序。
