牙用陶瓷具有良好的美观性能,但在咀嚼过程中易折裂。冷却可使陶瓷表面产生残余压应力,提高其抗折裂的能力。本文研究了不同冷却速度对铝增强釉瓷断裂韧性(Kc)和显微硬度(VMH)的影响。 材料和方法 制备含2％氧化铝的釉瓷,直径为8mm,厚度为0.6mm的圆盘形试件共45个。试件用陶瓷高温耐火材料包埋、烧结(试件置于炉口,593℃,维持10min,然后移入炉内以50℃/min的速度真空烧结 Dental ceramics have good aesthetic properties, but are prone to cracking during chewing. Cooling can make ceramic surface residual compressive stress, improve its ability to resist cracking. In this paper, the effects of different cooling rates on the fracture toughness (Kc) and microhardness (VMH) of aluminum-enhanced enamel were studied. MATERIALS AND METHODS A total of 45 disc-shaped specimens with 2% alumina were prepared, with a diameter of 8 mm and a thickness of 0.6 mm. The specimens were embedded in a ceramic refractory material and sintered (the specimens were placed in a furnace mouth at 593 ° C for 10 min and then transferred to a furnace for vacuum sintering at a rate of 50 ° C / min