摘要
目的探讨不同混合和热加工方式对义齿基托树脂力学性能的影响，探讨捏炼混合＋电烤箱加热的固化方式可否提高基托树脂的力学性能。方法制作4组基托树脂试件，第1组：常规混合＋水浴加热；第2组：捏炼混合＋水浴加热；第3组：常规混合＋电烤箱加热；第4组：捏炼混合＋电烤箱加热。测定树脂的表面硬度、弯曲强度和弯曲模量、冲击强度。结果第1～4组试件表面硬度分别为19．4、21．2、22．3、23．2N／mm^2，弯曲强度分别为58．58、63．32、66．73、63．76MPa，冲击强度分别为1．42、1．53、1．77、1．78KJ／m^2，弯曲模量分别为2311．38、2417．82、2566．36、2400．37MPa。结论与常规混合＋水浴加热方式相比，捏炼混合＋电烤箱加热方式制作的树脂有较高的表面硬度和冲击强度，综合力学性能较佳。
Objective To investigate the differences between the mechanical properties of denture base processed by traditional mixing and malaxation method, and by traditional hot water polymerization and electrical heat-polymerization. Methods Samples used in this investigation were commercial acrylic denture base resin made by using two different mixing methods, and by using two different curing methods. The samples were assigned to 4 test groups. Group 1 ： traditional mixing ＋ hot water polymerization . Group 2 ： malaxation ＋ hot water polymerization. Group 3 ： traditional mixing ＋ electrical heat-polymerization. Group 4： malaxation ＋ electrical heat-polymerization. Surface hardness, flexural strength, flexural modulus, and impact strength were tested of each sample. Results The mean of the four groups＇ surface hardness was 19. 4,21.2,22. 3,23.2 N/mm^2 ,and of flexural strength was 58.58,63.32,66.73,63.76 MPa ,and of impact strength was 1.42, 1.53,1.77,1.78 KJ/m^2, and of flexural modulus was 2311.38,2417. 82,2566. 36, 2400. 37 MPa. Conclusions Surface hardness and impact strength of malaxation method ＋ electrical heat- polymerization group are higher than those of traditional mixing ＋ hot water polymerization group.
出处
《中华口腔医学杂志》
CAS
CSCD
北大核心
2008年第9期564-565,共2页
Chinese Journal of Stomatology
