Kusy R P, Whitley J Q, Prewitt M J
Department of Orthodontics, University of North Carolina, Chapel Hill 27599-7455.
Angle Orthod. 1991 Winter;61(4):293-302. doi: 10.1043/0003-3219(1991)061<0293:COTFCF>2.0.CO;2.
Coefficients of friction were evaluated in the dry and wet (saliva) states for stainless steel, cobalt-chromium, nickel titanium, and beta-titanium wires against either stainless steel or polycrystalline alumina brackets. For both operators' experiments, an 0.010" stainless steel ligature wire pressed each archwire into the 0.018" or 0.022" bracket slot at 34 degrees C. In the dry state and regardless of slot size, the mean kinetic coefficients of friction were smallest for the all-stainless steel combinations (0.14) and largest for the beta-titanium wire combinations (0.46). The coefficients of the polycrystalline alumina combinations were generally greater than the corresponding combinations that included stainless steel brackets. In the wet state, the kinetic coefficients of the all-stainless steel combinations increased up to 0.05 over the dry state. In contrast, all beta-titanium wire combinations in the wet state decreased to 50% of the values in the dry state. The mixed reports that saliva may promote adhesive and lubricious behaviors may have some substance.
研究了不锈钢丝、钴铬合金丝、镍钛合金丝和β钛合金丝在干燥和湿润（唾液）状态下与不锈钢或多晶氧化铝托槽之间的摩擦系数。在两位操作者的实验中，均使用一根0.010英寸的不锈钢结扎丝在34摄氏度下将每根弓丝压入0.018英寸或0.022英寸的托槽槽沟中。在干燥状态下，无论槽沟尺寸如何，全不锈钢组合的平均动摩擦系数最小（0.14），β钛合金丝组合的平均动摩擦系数最大（0.46）。多晶氧化铝组合的摩擦系数通常大于包含不锈钢托槽的相应组合。在湿润状态下，全不锈钢组合的动摩擦系数比干燥状态下增加了0.05。相比之下，所有β钛合金丝组合在湿润状态下的数值降至干燥状态下的50%。关于唾液可能促进黏附及润滑行为的各种报道或许有一定道理。
