A study on the development of paste porcelain

1999年，按ISO 6872：1995标准对该瓷的基本性能进行了测试，并在华盛顿举行的第78<th>届IADR大会暨展览会上进行了展示。2000年4月6日。全瓷的抗折强度为109.3± 8.5MPa，明显高于传统粉末瓷（88.6±7.7MPa）。在4%醋酸中16小时后的化学溶解度测试结果为21.8μg/cm ^2，在100μg/cm ^2（max）范围内。2000年，我们根据合作研究员土平博士的建议，继续提高瓷的质量，土平博士是牙科技师学校的高级讲师。在最后一年，根据ISO/FDIS 9693：1999，金属陶瓷牙科修复系统测试粘结强度。不同合金的粘结强度分别为54.3±3.8MPa和43.7±5. 1 MPa（D.U.）分别它们与常规粉末瓷相似或略高。这些结果将在<th>圣地亚哥举行的IADR第80届大会暨展览会（3月6日至9日）上展出。（今后需要解决的问题）1。当用于单冠时，没有问题;但是，如果用于固定局部义齿，由于大量的膏体瓷，可能会发生脱落和裂纹。预烧干燥炉（可升温至300℃，并具有通风功能）被认为是保持空气清洁和保护传统瓷炉的必要条件。

In the year 1999, fundamental properties of this paste porcelain were tested according to ISO6872 : 1995 and the results were presented at 78^<th> General Session ＆ Exhibition of the IADR in Washington D,C. in April 6, 2000. The average flexural strength for paste porcelain was 109.3±8.5 MPa, which was significantly higher than that for conventional powder porcelain, G-Cera ORBIT, whose value was 88.6±7.7MPa. The result of chemical solubility test after refluxing 16hours in 4% acetic acid was 21.8μg/cm^2, which was within the range of 100μg/cm^2(max). In the year 2000, we continued to improve the quality of paste porcelain according the advices from the co-operative researcher, Dr. Tsuchihira, who is the senior lecturer of the school for dental technicians. In the final year, the bond strengths were tested according to ISO/FDIS 9693 : 1999, Metal Ceramic Dental Restorative Systems. The average bond strength measured for paste porcelain was different according to the alloy used, which were 54.3±3.8MPa (MC70) and 43.7±5. 1 MPa(D.U.) respectively. They were similar or slightly higher than that for conventional powder porcelain. These results will be shown at the 80^<th> General Session ＆ Exhibition of the IADR(March6-9) in San Diego.(Problems to be solved in the future)1. When used for a single crown, there is no problem ; however, in case used for a fixed partial denture, detachments and the crack may happen because of the large amount of paste porcelain.2. A pre-firing drying furnace (which can raise the temperature till 300℃ and has the ventilation function)is thought to be essential to keep the air clean and to protect the conventional porcelain furnace.