Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Dent Mater. 2010 Apr;26(4):360-7. doi: 10.1016/j.dental.2009.12.007. Epub 2010 Jan 6.
The purpose of this study was to evaluate the relationship between changes in the modulus of elasticity and ultimate tensile strength of one-step self-etch adhesives, and their degree of water sorption.
Five one-step self-etch adhesives, Xeno IV (Dentsply Caulk), G Bond (GC Corp.), Clearfil S3 Bond (Kuraray Medical Inc.), Bond Force (Tokuyama Dental Corp.), and One-Up Bond F Plus (Tokuyama Dental Corp.) were used. Ten dumbelled-shaped polymers of each adhesive were used to obtain the modulus of elasticity by the three-point flexural bending test and the ultimate tensile strength by microtensile testing. The modulus of elasticity and the ultimate tensile strength were measured in both dry and wet conditions before/after immersion in water for 24h. Water sorption was measured, using a modification of the ISO-4049 standard. Each result of the modulus of elasticity and ultimate tensile strength was statistically analyzed using a two-way ANOVA and the result of water sorption was statistically analyzed using a one-way ANOVA. Regression analyses were used to determine the correlations between the modulus of elasticity and the ultimate tensile strength in dry or wet states, and also the percent decrease in these properties before/after immersion of water vs. water sorption.
In the dry state, the moduli of elasticity of the five adhesive polymers varied from 948 to 1530 MPa, while the ultimate tensile strengths varied from 24.4 to 61.5 MPa. The wet specimens gave much lower moduli of elasticity (from 584 to 1073 MPa) and ultimate tensile strengths (from 16.5 to 35.0 MPa). Water sorption varied from 32.1 to 105.8 g mm(-3).
The moduli of elasticity and ultimate tensile strengths of the adhesives fell significantly after water-storage. Water sorption depended on the constituents of the adhesive systems. The percent decreases in the ultimate tensile strengths of the adhesives were related to water sorption, while the percent reductions in the moduli of elasticity of the adhesives were not related to water sorption.
本研究旨在评估一步法自酸蚀粘结剂的弹性模量和极限拉伸强度的变化与其吸水性之间的关系。
使用 5 种一步法自酸蚀粘结剂，即 Xeno IV（登士柏）、G Bond（GC 公司）、Clearfil S3 Bond（可乐丽株式会社）、Bond Force（德山齿科）和 One-Up Bond F Plus（德山齿科）。每种粘结剂各制作 10 个哑铃形聚合物试件，通过三点弯曲挠曲试验测定弹性模量，通过微拉伸试验测定极限拉伸强度。在干燥和浸水（24h）两种状态下分别测量弹性模量和极限拉伸强度。使用 ISO-4049 标准的改进方法测量吸水性。使用双向方差分析对弹性模量和极限拉伸强度的各项结果进行统计学分析，使用单向方差分析对吸水性结果进行统计学分析。采用回归分析确定干燥或浸水状态下弹性模量和极限拉伸强度之间的相关性，以及浸水前后这些性能的百分比降低值与吸水性之间的相关性。
在干燥状态下，5 种粘结剂聚合物的弹性模量为 948 至 1530MPa，极限拉伸强度为 24.4 至 61.5MPa。湿标本的弹性模量（584 至 1073MPa）和极限拉伸强度（16.5 至 35.0MPa）均明显降低。吸水性为 32.1 至 105.8g/mm³。
水储存后，粘结剂的弹性模量和极限拉伸强度显著下降。吸水性取决于粘结剂系统的成分。粘结剂的极限拉伸强度降低百分比与吸水性有关，而粘结剂的弹性模量降低百分比与吸水性无关。
