The microwave sintering of zirconia microwave denture furnace is essentially different from the conventional sintering process.

Traditional heating is through resistance heating, and the heat is transferred to the sample by means of radiation, conduction and convection, and the sample has a phenomenon of high surface temperature and low core temperature. Microwave sintering is the use of electromagnetic waves in a specific band to couple with the basic microstructure of the material to generate heat. The dielectric loss of the material in the electromagnetic field makes the material as a whole heated to the sintering temperature to achieve densification. In this regard, a large number of microwave sintered zirconia denture process researches have been carried out at home and abroad. According to literature records: compared with traditional sintering, microwave sintering time is shortened by more than 50%, sintering temperature is reduced by 70-100 ° C, and the relative density of sintering reaches 50%. More than 99.5%, the performance indicators such as hardness, flexural strength, fracture toughness, and aging resistance have been significantly improved, and the grains are finer; microwave sintering has many advantages: it can achieve rapid and uniform heating, and there is no heat in the sintering process. The stress, grains are uniform and fine, and the density is high. Microwave sintering is also beneficial to reduce the sintering temperature, increase the sintering rate, and improve the microstructure and properties.

As a carrier to realize microwave sintering technology, the research and development of high-performance zirconia denture microwave rapid sintering equipment and technology is urgent. As far as zirconia dentures are concerned, the sintering of zirconia dentures at this stage mainly adopts electric furnace sintering, mostly using silicon carbon rods and silicon molybdenum rods as electric heating materials, which have long sintering time, low yield rate and low single kiln output; silicon carbon rods and Silicon molybdenum rods are prone to volatilization at high temperatures and cause contamination to denture products, while microwave sintering has no contamination.