Mitra Sumita B, Lee Chi-Ying, Bui Hoa T, Tantbirojn Daranee, Rusin Richard P
3M ESPE Dental Products, Maplewood, MN 55144, USA.
Dent Mater. 2009 Apr;25(4):459-66. doi: 10.1016/j.dental.2008.09.008. Epub 2008 Nov 28.
The contribution of chemical bonding of the polycarboxylic acid in classical powder/liquid conventional glass ionomers (GI) and resin-modified glass-ionomers (RMGI) has been attributed to the excellent long-term bond strengths and clinical retention. RMGIs have been recently introduced as paste/liquid systems for convenience of clinical usage. The objective of this study was to investigate the long-term bond strengths and mechanism of adhesion of paste-liquid RMGI in order to ascertain whether similar characteristics are retained.
Long-term shear adhesion to dentin and enamel was measured on two paste-liquid RMGIs and one powder/liquid RMGI. Scanning electron microscopy (SEM), Fourier-transformed infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses were carried out on the paste-liquid RMGI Vitrebond Plus (VBP) and compared with the classical powder/liquid RMGI Vitrebond (VB).
VBP maintains adhesion to dentin and enamel over long times; its long-term adhesive performance is equivalent to VB. FTIR data confirm that VBP exhibits the carboxylate crosslinking reaction of a true glass ionomer. SEM images show evidence of micromechanical bonding at the interface between VBP and the tooth. XPS and FTIR data show that the methacrylated copolyalkenoic acid component present in VB and VBP chemically bonds to the calcium in HAP.
The new paste-liquid RMGI liner, VBP, shows equivalent adhesion to its powder-liquid predecessor, VB. The adhesion mechanism was attributed to micromechanical and chemical bonding. This chemical bond is a significant factor in the excellent long-term adhesion of these materials.
在传统的粉液型常规玻璃离子水门汀（GI）和树脂改性玻璃离子水门汀（RMGI）中，多元羧酸的化学键合作用被认为是其具有优异的长期粘结强度和临床保留率的原因。最近引入的RMGI为糊剂/液体系统，方便临床使用。本研究的目的是研究糊剂-液体RMGI的长期粘结强度和粘结机制，以确定是否保留了类似的特性。
在两种糊剂-液体RMGI和一种粉液型RMGI上测量其对牙本质和釉质的长期剪切粘结力。对糊剂-液体RMGI Vitrebond Plus（VBP）进行扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）分析，并与传统粉液型RMGI Vitrebond（VB）进行比较。
VBP在长时间内保持对牙本质和釉质的粘结力；其长期粘结性能与VB相当。FTIR数据证实VBP表现出真正玻璃离子水门汀的羧酸盐交联反应。SEM图像显示了VBP与牙齿界面处微机械粘结的证据。XPS和FTIR数据表明，VB和VBP中存在的甲基丙烯酸化共聚链烯酸成分与羟基磷灰石（HAP）中的钙发生化学键合。
新型糊剂-液体RMGI衬层VBP与其粉液型前身VB表现出同等的粘结力。粘结机制归因于微机械粘结和化学键合。这种化学键合是这些材料优异长期粘结力的一个重要因素。
