Shrinkage strain-rates of dental resin-monomer and composite systems

被引:129
|
作者
Atai, M
Watts, DC
Atai, Z
机构
[1] IPPI, Dept Polymer Sci, Tehran 14977, Iran
[2] Univ Manchester, Sch Dent, Biomat Unit, Manchester M15 6FH, Lancs, England
[3] Kerman Univ Med Sci, Sch Dent, Kerman, Iran
关键词
dental composites; monomer system; shrinkage strain; shrinkage strain rate; conversion; viscosity;
D O I
10.1016/j.biomaterials.2005.01.022
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
The purpose of this study was to investigate the shrinkage strain rate of different monomers, which are commonly used in dental composites and the effect of monomer functionality and Molecular mass oil the rate. Bis-GMA, TEGDMA, UDMA, MMA, HEMA, HPMA and different ratios of Bis-GMA/TEGDMA were mixed with Camphorquirione and Dimethyl aminoethyle methacrylate as initiator system. The shrinkage strain of the samples photopolymerised at Ca. 550mW/cm(2) and 23 degrees C was measured using the bonded-disk technique of Watts and Cash (Meas. Sci. Technol. 2 (1991) 788-794), and initial shrinkage-strain rates were obtained by numerical differentiation. Shrinkage-strain rates rose rapidly to a maximum, and then fell rapidly upon vitrification. Strain and initial strain rate were dependent upon monomer functionality, molecular mass and viscosity. Strain rates were correlated with Bis-GMA in Bis-GMA/ TEGDMA mixtures up to 75-80w/w%, due to the higher molecular mass of Bis-GMA affecting termination reactions, and then decreased due to its higher viscosity affecting propagation reactions. Monofunctional monomers exhibited lower rates. UDMA, a difunctional monomer of medium viscosity, showed the highest shrinkage strain rate (P < 0.05). Shrinkage strain rate, related to polymerization rate, is an important factor affecting the biomechanics and marginal integrity of composites cured in dental cavities. This study shows how this is related to monomer molecular structure and viscosity. The results are significant for the production, optimization and clinical application of dental composite restoratives. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:5015 / 5020
页数:6
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