Urapepon S, Ogura H
Nippon Dental University Graduate School at Niigata, Japan.
Dent Mater J. 1999 Sep;18(3):278-94. doi: 10.4012/dmj.18.278.
In order to further improve the mechanical properties of a metal-resin composite and avoid the problems which were found in the previous metal-resin composite using a 2-paste system, another type of metal-resin composite using a powder-liquid system was developed. In the new system 4-META treatment was carried out at low temperature and DMPT was separated from the 4-META treated particles. The efficacy of this system as well as the effects of 4-META concentration, duration of 4-META treatment (immersion time) and filler content on the flexural properties, working time and setting time were investigated. The flexural strength of the powder-liquid composite was significantly affected by two main factors, immersion time and filler content, and the other properties (flexural modulus, working time and setting time) were by all three main factors. The highest flexural strength of the prepared composite was 91.8 MPa, which was higher than that of the 2-paste composite (64.0 MPa) by about 43%. This was achieved at a 0.1 ratio of 4-META concentration, 30 s immersion time and 94 mass% filler content. The working time and setting time ranged between 2.3-13.6 min and 4.2-20.1 min, respectively, and those of the highest strength composite were 3.0 and 5.2, respectively. The results of the present study indicate that the powder-liquid system is effective to improve the properties of the metal-resin composite.
为了进一步提高金属树脂复合材料的机械性能，并避免在先前使用双糊剂系统的金属树脂复合材料中发现的问题，开发了另一种使用粉末-液体系统的金属树脂复合材料。在新系统中，4-META处理在低温下进行，并且DMPT从经过4-META处理的颗粒中分离出来。研究了该系统的功效以及4-META浓度、4-META处理持续时间（浸泡时间）和填料含量对弯曲性能、操作时间和凝固时间的影响。粉末-液体复合材料的弯曲强度受两个主要因素显著影响，即浸泡时间和填料含量，而其他性能（弯曲模量、操作时间和凝固时间）则受所有三个主要因素影响。制备的复合材料的最高弯曲强度为91.8MPa，比双糊剂复合材料（64.0MPa）高出约43%。这是在4-META浓度比为0.1、浸泡时间为30秒和填料含量为94质量%的条件下实现的。操作时间和凝固时间分别在2.3 - 13.6分钟和4.2 - 20.1分钟之间，强度最高的复合材料的操作时间和凝固时间分别为3.0分钟和5.2分钟。本研究结果表明，粉末-液体系统对于改善金属树脂复合材料的性能是有效的。
