Improvement of prothodontic resin composite containing nano-filler

1.纳米复合树脂的制备纳米复合树脂的填料由Al_2O_3、TiO_2、CeO_2和SiO_2组成，平均粒径为30 nm。该填料用硅烷偶联剂、4-Meta和/或用于每种金属氧化物的有效偶联剂在乙醇溶液中处理。离心式光固化装置的开发和固化剂的制备开发了离心式光固化装置，该装置配备有四个150 W的卤素灯、玻璃管和旋转开关。将含有纳米填料的复合浆料填充在高度为30 mm的玻璃管中，然后以1，500 rpm离心90 min，接着在连续旋转下光固化30 min。管体底部的块体树脂复合材料用于CAD/CAM复合材料块体.冠状复合材料修复体的制备以上述树脂复合材料为原料，采用CAD/CAM技术制作前磨牙复合材料冠。以口腔修复复合材料作为对照.伺服疲劳试验机抗折性能的评价将前磨牙复合冠用树脂粘接剂粘接在钢制主基牙上，用伺服疲劳试验机评价不同复合冠的抗折性能。高填充纳米复合材料制作的冠的断裂载荷显示出显著的最高值。

1. Preparation of nano-composite resinThe filler of nano-composite resin is consisted of Al_2O_3, TiO_2, CeO_2, and SiO_2 which of mean particle size are 30 nm. This filler was treated with silane coupler, 4-META, and/or effective coupler for each metal oxide in ethanol solution.2. Development of centrifugal light-curing apparatus and preparation of specimensA centrifugal light-curing apparatus was developed and this unit is equipped with four halogen lamps of 150 W, glass tubes, and switches for rotation. The composite paste containing nano-filler was filled in the glass tube of height 30 mm, and then centrifuged by 1, 500 rpm for 90 min, followed by light-cured for 30 min with continuously rotation. The bulk rein composites at the bottom of the tubes were used for CAD/CAM composite block.3. Preparation of crown-shaped composite specimensPremolar composite crowns were manufactured from described-above bulk rein composites by CAD/CAM machine. A prosthodontic composite material was used as controls.4. Evaluation of fracture resistance using servo-controlled fatigue machineThe premolar composite crowns were luted on the master-abutment made of steel with resin luting cement, and followed by evaluated fracture resistance of the different composite crowns using servo-controlled fatigue machine. The fractured load of crowns made of highly filled nano-composite showed significantly highest values.