Tecco Simona, Teté Stefano, Festa Mario, Festa Felice
Department of Oral Science, Nano, and Biotechnology, University G.D'Annunzio, Chieti, Pescara, Italy.
World J Orthod. 2010 Winter;11(4):e133-44.
To compare friction (F) of conventional and ceramic brackets (0.022-inch slot) using a model that tests the sliding of the archwire through 10 aligned brackets.
Polycrystalline alumina brackets (PCAs), PCA brackets with a stainless steel slot (PCA-M), and monocrystalline sapphire brackets (MCS) were tested under elastic ligatures using various archwires in dry and wet (saliva) states. Conventional stainless steel brackets were used as controls.
In both dry and wet states, PCA and MCS brackets expressed a statistically significant higher F value with respect to stainless steel and PCA-M brackets when combined with the rectangular archwires (P<.01). PCA brackets showed significantly higher friction than MCS brackets (P<.01) when coupled with 0.014 x 0.025-inch nickel-titanium (Ni-Ti) archwire. SEM analysis showed differences in the surfaces among stainless steel, MCS, PCA-M, and PCA brackets. In the wet state, the mean F values were generally higher than in the dry state.
PCA brackets showed significantly higher F than MCS brackets only when combined with 0.014 x 0.025-inch Ni-Ti archwires. Thus, in this study, a 10 aligned-brackets study model showed similar results when compared to a single bracket system except for friction level with 0.014 × 0.025-inch Ni-Ti archwires.
使用一种测试弓丝在10个对齐托槽中滑动的模型，比较传统托槽和陶瓷托槽（0.022英寸槽沟）的摩擦力（F）。
在弹性结扎下，使用各种弓丝，在干燥和湿润（唾液）状态下测试多晶氧化铝托槽（PCA）、带不锈钢槽沟的PCA托槽（PCA-M）和单晶蓝宝石托槽（MCS）。使用传统不锈钢托槽作为对照。
在干燥和湿润状态下，当与矩形弓丝组合时，PCA和MCS托槽相对于不锈钢托槽和PCA-M托槽表现出统计学上显著更高的F值（P<0.01）。当与0.014×0.025英寸镍钛（Ni-Ti）弓丝配合使用时，PCA托槽显示出比MCS托槽显著更高的摩擦力（P<0.01）。扫描电子显微镜（SEM）分析显示不锈钢托槽、MCS托槽、PCA-M托槽和PCA托槽之间表面存在差异。在湿润状态下，平均F值通常高于干燥状态。
仅当与0.014×0.025英寸Ni-Ti弓丝组合时，PCA托槽显示出比MCS托槽显著更高的F值。因此，在本研究中，与单个托槽系统相比，除了与0.014×0.025英寸Ni-Ti弓丝的摩擦力水平外，10个对齐托槽的研究模型显示出相似的结果。
