Jagger R G, Okdeh A
Department of Restorative Dentistry, Dental School, University of Wales College of Medicine, Cardiff, South Wales, United Kingdom.
J Prosthet Dent. 1995 Nov;74(5):542-5. doi: 10.1016/s0022-3913(05)80359-2.
This study characterized a range of commercially available polymethyl methacrylate sheets with respect to molecular weight, residual monomer content, and glass transition temperature and then developed a thermoforming procedure that produced visually satisfactory thermoformed polymethyl methacrylate specimens. Molecular weight values of Perspex material were considerably greater than those of the other materials. All materials but Diakon had residual monomer concentrations of less than 1% and glass transition temperature values greater than 100 degrees C. Perspex material was selected for further investigation. It was necessary to preheat Perspex sheets in an oven at 160 degrees C for at least 30 minutes before heating and forming on the thermoforming apparatus to obtain acceptable specimens.
本研究对一系列市售聚甲基丙烯酸甲酯板材的分子量、残留单体含量和玻璃化转变温度进行了表征，然后开发了一种热成型工艺，该工艺能生产出外观令人满意的热成型聚甲基丙烯酸甲酯试样。有机玻璃材料的分子量值明显高于其他材料。除了迪亚康外，所有材料的残留单体浓度均低于1%，玻璃化转变温度值均高于100摄氏度。选择有机玻璃材料进行进一步研究。在热成型设备上加热和成型之前，有必要将有机玻璃板材在160摄氏度的烤箱中预热至少30分钟，以获得可接受的试样。
