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制备了一种口腔正畸胶粘剂,并研究了功能单体结构对其性能的影响。功能单体二甲基丙烯酸乙氧基均苯四甲酸酯(PMDM)结构中含有双甲基丙烯酸酯可聚合基团、双粘接性羧基及强极性羟基基团。研究结果表明,随着PMDM含量的增加,羧基浓度增加,胶粘剂的粘接强度也随之增大;当w(PMDM)=10%时,剪切强度达最大值(20.81MPa);与传统功能单体4-甲基丙烯酰氧乙基偏苯三酸酐(4-META)相比,PMDM的优点是可以通过聚合基团引发交联反应,并且易溶于基质树脂中,从而减少了稀释剂的用量,胶粘剂固化物的硬度提高至90.37N/mm2;PMDM中的极性基团可与填料羟基磷灰石(HAP)中的羟基形成次价键,从而提高了基质树脂与HAP的界面粘接力,使胶粘剂与牙釉质之间的破坏方式为粘接破坏,有利于正畸托槽的摘除。
An orthodontic adhesive was prepared and the effect of functional monomer structure on its properties was studied. Functional monomers Dimethylacrylate ethoxylated pyromellitate (PMDM) structure contains a dimethacrylate polymerizable group, a double-bonded carboxyl group and a strongly polar hydroxyl group. The results show that with the increase of PMDM content, the carboxyl group concentration increases and the adhesive strength of the adhesive increases. When the w (PMDM) = 10%, the shear strength reaches the maximum (20.81MPa) The advantage of PMDM over monomeric 4-methacryloyloxyethyl trimellitic anhydride (4-META) is that the crosslinking reaction can be initiated by the polymeric groups and is readily soluble in the matrix resin thereby reducing the amount of diluent used, The hardness of the adhesive cured material increased to 90.37N / mm2; the polar groups in the PMDM formed secondary bonds with the hydroxyl groups in the filler hydroxyapatite (HAP) to improve the interfacial adhesion between the matrix resin and the HAP, So that the adhesive and enamel between the destruction of bonding damage, is conducive to the removal of orthodontic brackets.