【摘要】 目的:观察保存时间对3种实验性牙本质粘接处理剂的粘接强度的影响。方法:将3种实验性粘接处理剂10-甲基丙烯酰氧癸基双氢磷酸盐-2-羟乙基丙烯酸酯(MDP-HEMA),MDP-N-甲基丙烯酰甘氨酸(MDP-NMGly),N-甲基丙烯酰-2-氨乙基膦酸-NMGly(NMEP-NMGly)制备后置于40℃保温箱中6周和14周,在不同的保存时期分别测试剪切粘接强度(n=14)和p H值以及断裂模式和扫面电镜观察。结果:经过14周40℃的保存,MDP-HEMA剪切粘接强度由(17.61±1.56)MPa下降到(7.53±1.76)MPa;而MDP-NMGly和NMEP-NMGly则没有显著下降。断裂模式显示经过14周保存的MDP-HEMA和MDP-NMGly以界面破坏为主;而NMEP-NMGly仍然以树脂/牙本质断裂为主。SEM观察保存14周后MDP-HEMA和MDP-NMGly均有树脂与牙本质的分离,而NMEP-NMGly则没有明显的界面分离。结论:NMEP-NMGly具有更好的稳定性。更多还原

【Abstract】 Objective: To observe the effect of storage period of three experimental dentin self-etching primers on the shear bond strength. Methods: Three experimental primers with 2-hydroxyethyl methacrylate( HEMA) or N-methacryloyl glycine( NMGly) as a hydrophilic monomer and 10-methacryloxydecyl dihydrogen phosphate( MDP) or N-methacryloyl-2-aminoethylphosphonic acid( NMEP)as an acid monomer,were designed. Immediately after preparation of the samples of MDP-HEMA,MDP-NMGly and NMEP-NMGly,the primers were stored at 40 ℃ for 0,6 and 14 weeks. At the end of each storage period,the shear bond strength of resin to dentin( n= 14) and the p H value of the primers were measured. Results: After storage at 40 ℃ for 14 weeks,the shear bond strength of MDPHEMA decreased from( 17. 61 ± 1. 56) MPa to( 7. 53 ± 1. 76) MPa; however the bond strenth of MDP-NMGly and NMEP-NMGly did not decrease; most of the specimens of MDP-HEMA and MDP-NMGly exhibited an interfacial failure of the resin from the dentin surface; however NMEP-NMGly exhibited a cohesional failure of the dentin and / or resin. The SEM images showed a separation of resin and dentin of MDP-HEMA and MDP-NMGly had storaged at 40 ℃ for 14 weeks; while the interface of NMEP-NMGly did not change. Conclusion: The NMEP-NMGly primer has noticeably higher hydrolytic stability than the MDP-HEMA and MDP-NMGly primers.更多还原