Pereira Graziane Olímpio, Gimenez Carla Maria Melleiro, Prieto Lucas, Prieto Marcos Gabriel do Lago, Basting Roberta Tarkany
Research Assistant, São Leopoldo Mandic, Department of Dental Material and Restorative Dentistry, School of Dentistry and Research Institute, Campinas, São Paulo, Brazil.
Professor, Universidade de Araras (UNIARARAS), Department of Orthodontics, Araras, São Paulo Brazil. Universidade Estadual Paulista (FOA-UNESP), School of Dentistry, Department of Orthodontics, Araraquara, São Paulo, Brazil.
Dental Press J Orthod. 2016 Jul-Aug;21(4):34-40. doi: 10.1590/2177-6709.21.4.034-040.oar.
To evaluate stainless steel archwire static friction in active and passive self-ligating lingual and conventional brackets with second-order angulations.
Two conventional lingual brackets for canines (STb light/Ormco; PSWb/Tecnident), and two self-ligating brackets, one active (In-Ovation L/GAC) and the other passive (3D/ Forestadent), were evaluated. A stainless steel archwire was used at 0°, 3° and 5° angulations. Metal ligatures, conventional elastic ligatures, and low friction elastic ligatures were also tested. A universal testing machine applied friction between brackets and wires, simulating sliding mechanics, to produce 2-mm sliding at 3 mm/minute speed.
Two-way analysis of variance demonstrated a significant effect of the interaction between brackets and angulations (p < 0.001). Tukey test indicated that the highest frictional resistance values were observed at 5° angulation for In-Ovation L, PSWb bracket with non conventional ligature, and STb bracket with metal ligature. As for 3D, PSWb with conventional or metal ligatures, and STb brackets with non conventional ligature, showed significantly lower static frictional resistance with 0° angulation. At 0° angulation, STb brackets with metal ties, In-Ovation L brackets and 3D brackets had the lowest frictional resistance.
As the angulation increased from 0° to 3°, static friction resistance increased. When angulation increased from 3° to 5°, static friction resistance increased or remained the same. Self-ligating 3D and In-Ovation L brackets, as well as conventional STb brackets, seem to be the best option when sliding mechanics is used to perform lingual orthodontic treatment.
评估不锈钢弓丝在具有二级角度的主动和被动自锁舌侧及传统托槽中的静摩擦力。
评估了两种用于犬齿的传统舌侧托槽（STb light/奥美科；PSWb/特奈登），以及两种自锁托槽，一种是主动式（In-Ovation L/美国GAC国际公司），另一种是被动式（3D/弗罗斯塔登特）。使用了角度为0°、3°和5°的不锈钢弓丝。还测试了金属结扎丝、传统弹性结扎丝和低摩擦弹性结扎丝。一台万能试验机在托槽和弓丝之间施加摩擦力，模拟滑动力学，以3毫米/分钟的速度产生2毫米的滑动。
双向方差分析表明托槽和角度之间的相互作用具有显著影响（p < 0.001）。 Tukey检验表明，对于In-Ovation L托槽、使用非传统结扎丝的PSWb托槽以及使用金属结扎丝的STb托槽，在5°角度时观察到最高的摩擦阻力值。至于3D托槽、使用传统或金属结扎丝的PSWb托槽以及使用非传统结扎丝的STb托槽，在0°角度时显示出显著较低的静摩擦阻力。在0°角度时，使用金属结扎丝的STb托槽、In-Ovation L托槽和3D托槽具有最低的摩擦阻力。
随着角度从0°增加到3°，静摩擦阻力增加。当角度从3°增加到5°时，静摩擦阻力增加或保持不变。当使用滑动力学进行舌侧正畸治疗时，自锁3D和In-Ovation L托槽以及传统STb托槽似乎是最佳选择。
