Evaluation on the mechanical properties and biocompatibility of the FRP esthetic orthodontic wire for clinical application

评价临床应用的玻璃钢美学矫正丝的力学性能和生物相容性是本研究的目的。研究结果如下：1。经浸没后的玻璃钢丝经水浸没后的力学性能。水浸泡后，滞回环的失活载荷和弹性恢复明显降低。为了防止这种情况，采用R&D方法对Bis-GMA进行涂层处理。采用浸渍速度为1cm /min的方法，研制出涂有该涂层的FRP。结果表明，30 D后肌肉负荷保持良好（D/L为60 ~ 80%），弹性恢复良好。采用热拉伸法制备具有生物相容性的CaO-P_2O_5-SiO_2-Al_2O_3 （CPSA）玻璃纤维与PMMA基体复合的玻璃钢丝，采用光固化聚合法制备具有足够扭转力的矩形材。以牙科复合树脂为基体的FRP丝的扭转载荷为Ni-Ti丝的1/2。这表明，纤维含量对弯曲载荷的影响主要是由纤维含量决定的，而使用纤维基材料作为基体对扭转性能的影响更为有效。为了避免结扎产生的剪切力，对不同曲率半径的支架进行了改进。随着曲率半径的增大，FRP丝的挠度极限和弹性性能的恢复有所提高。结扎弯曲试验也表明，该材料具有良好的弹性回复率和较高的承载能力。得到了单接触面和双接触面条件下正畸金属丝与托槽之间的摩擦特性和摩擦系数。除多晶氧化铝支架外，带支架的玻璃钢丝的摩擦性能与金属丝相似。

The evaluation on the mechanical properties and biocompatibility of the FRP esthetic orthocontic wire for clinincal appoication is the aim of this research. The results are as follows:1. After the FRP wire have been immersed in mechanical properties through water immersion. The deactivating load and elastic recovery in s hysterisis loop decreased much after water immersion. To prevent this, Bis-GMA was coated by R＆D method. The FRP with this coating by the method of R＆D with dipping speed 1 cm/min., showed sufficient rtention of flesural load (D/L 60-80 %) and good elastic recovery even after 30 days.2. To develop the FRP wires in combination with biocompatible CaO-P_2O_5-SiO_2-Al_2O_3 (CPSA) glass fibers and PMMA matrix by hot drawing method, a photo cure polymerization method was applied to form the rectangular timber with a sufficient torque force. The FRP wire using dental composite resin for matrix showed a torsional load of 1/2 of Ni-Ti wire. This showed that the fiber content mainly contributes to flexural load while the use of stigg materials for the matrix is much more effective for improbing torsional properties.3. To avoid the shear force exerted by ligatures, improved brackets with various radius curvature were evaluated. The limit of deflection of the FRP wire and the recovery of the elastic properties improved with the larger radius curvatures. It was also clarified from ligated bending test that good elastic recovery and high load-retention could be obtained.4. The frictional properties between orthodontic wires and brackets and frictional coefficients were obtained under conditions of single contact plane and double contact planes. The friction properties of FRP wire with brackets were similar to those of metal wires expect for the polycrystalline alumina bracket.