Apparent conversion of adhesive resin in the hybrid layer, Part 1: Identification of an internal reference for Raman spectroscopy and the effects of water storage.
Apparent conversion of adhesive resin in the hybrid layer, Part 1: Identification of an internal reference for Raman spectroscopy and the effects of water storage.
复制标题
混合层中粘合树脂的表观转化，第 1 部分：拉曼光谱内参的识别和水储存的影响。
DOI：
10.1002/jbm.a.31684
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Jessop,JulieLP
中科院分区：
文献类型：
--
作者：
Zou,Yuan;Armstrong,StevenR;Jessop,JulieLP
混合层中粘合剂的转化率对牙本质粘结的质量和寿命很重要。在本研究中，使用拉曼光谱测定实验和商业粘合剂树脂的转化度和相对共聚单体浓度。目的是鉴定稳定的拉曼散射峰，用作内部参考，并确定水储存对测量的转化率和共聚单体浓度的影响。605 cm-1处的峰在整个聚合过程中没有变化，并且与两种粘合剂中的单体有关。该峰用作水储存前后转化率和组成计算的内标。光聚合后立即进行的粘合剂树脂的转化率比24 h水储存后测量的转化率低约20%。在光聚合之后立即在粘合剂树脂中的HEMA浓度（相对于双GMA）比在24小时水储存之后测量的浓度高至少5重量%。未反应的HEMA的洗脱为转化率测量中的“假定”变化提供了合理的解释，其更适当地描述为表观转化率。这种表观转化将影响聚合物的物理性质和结构的解释，以及增加水渗透及其在混合层内反应的可能性。© 2007威利期刊公司生物医学材料研究杂志2008
Monomer conversion of adhesives in the hybrid layer is important to the quality and longevity of the dentin bond. In this study, degree of conversion and relative co‐monomer concentrations of both experimental and commercial adhesive resins were determined using Raman spectroscopy. The objectives were to identify stable Raman scattering peaks to use as internal references and to determine the effect of water storage on measured conversion and co‐monomer concentrations. The peak at 605 cm−1did not change throughout polymerization and is associated with monomers in both adhesives. This peak was used as an internal reference for conversion and composition calculations before and after water storage. Conversion of the adhesive resins immediately after photopolymerization was ∼20% lower than that measured after 24‐h water storage. HEMA concentration (relative to bis‐GMA) in the adhesive resins immediately after photopolymerization was at least 5 wt % higher than that measured after 24‐h water storage. Elution of unreacted HEMA provides a reasonable explanation for the “supposed” change in conversion measurements, which is more appropriately described as apparent conversion. This apparent conversion will impact interpretation of physical properties and structure of the polymer, as well as increase the probability of water penetration and its reaction within the hybrid layer. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res 2008