Malacarne Juliana, Carvalho Ricardo M, de Goes Mario F, Svizero Nadia, Pashley David H, Tay Franklin R, Yiu Cynthia K, Carrilho Marcela Rocha de Oliveira
Department of Restorative Dentistry, Dental Materials Division, Piracicaba School of Dentistry, University of Campinas, Av. Limeira, 901 Areião - Materiais Dentários, Piracicaba, SP 13414-903, Brazil.
Dent Mater. 2006 Oct;22(10):973-80. doi: 10.1016/j.dental.2005.11.020. Epub 2006 Jan 6.
This study evaluated the water sorption, solubility and kinetics of water diffusion in commercial and experimental resins that are formulated to be used as dentin and enamel bonding agents.
Four commercial adhesives were selected along with their solvent-monomer combination: the bonding resins were of Adper Scotchbond Multi-Purpose (MP) and Clearfil SE Bond (SE) systems, and the "one-bottle" systems, Adper Single Bond (SB) and Excite (EX). Five experimental methacrylate-based resins of known hydrophilicities (R1, R2, R3, R4 and R5) were used as reference materials. Specimen disks were prepared by dispensing the uncured resin into a mould (5.8mm x 0.8mm). After desiccation, the cured specimens were weighed and then stored in distilled water for evaluation of the water diffusion kinetics over a 28-day period.
Resin composition and hydrophilicity (ranked by their Hoy's solubility parameters) influenced water sorption, solubility and water diffusion in both commercial and experimental dental resins. The most hydrophilic experimental resin, R5, showed the highest water sorption, solubility and water diffusion coefficient. Among the commercial adhesives, the solvated systems, SB and EX, showed water sorption, solubility and water diffusion coefficients significantly greater than those observed for the non-solvated systems, MP and SE (p<0.05). In general, the extent and rate of water sorption increased with the hydrophilicity of the resin blends.
The extensive amount of water sorption in the current hydrophilic dental resins is a cause of concern. This may affect the mechanical stability of these resins and favor the rapid and catastrophic degradation of resin-dentin bonds.
本研究评估了作为牙本质和牙釉质粘结剂使用的市售及实验性树脂的吸水性、溶解性以及水扩散动力学。
选择了四种市售粘合剂及其溶剂 - 单体组合：粘结树脂为Adper Scotchbond多用途（MP）和Clearfil SE Bond（SE）系统，以及“单瓶”系统Adper Single Bond（SB）和Excite（EX）。使用五种已知亲水性的实验性甲基丙烯酸酯基树脂（R1、R2、R3、R4和R5）作为参考材料。通过将未固化的树脂倒入模具（5.8mm×0.8mm）中制备试样盘。干燥后，称取固化后的试样，然后将其储存在蒸馏水中，以评估28天内的水扩散动力学。
树脂组成和亲水性（按其霍伊溶解度参数排序）影响了市售和实验性牙科树脂的吸水性、溶解性和水扩散。亲水性最强的实验树脂R5表现出最高的吸水性、溶解性和水扩散系数。在市售粘合剂中，溶剂化系统SB和EX的吸水性、溶解性和水扩散系数显著高于非溶剂化系统MP和SE（p<0.05）。一般来说，吸水性的程度和速率随着树脂共混物亲水性的增加而增加。
当前亲水性牙科树脂中大量的吸水性令人担忧。这可能会影响这些树脂的机械稳定性，并有利于树脂 - 牙本质粘结的快速和灾难性降解。
