Effect of resin-composite filler particle size and shape on shrinkage-stress

被引：91
作者：
Satterthwaite, Julian D. [1 ]
Maisuria, Amit [1 ]
Vogel, Karin [2 ]
Watts, David C. [1 ]
机构：
[1] Univ Manchester, Sch Dent, Manchester M13 9PL, Lancs, England
[2] Ivoclar Vivadent AG, Schaan, Liechtenstein
来源：
DENTAL MATERIALS | 2012年 / 28卷 / 06期
关键词：
Resin-composite; Filler; Dispersed phase; Shrinkage; Stress; POLYMERIZATION SHRINKAGE; HYGROSCOPIC EXPANSION; CONTRACTION STRESS; RESTORATIONS; DEFORMATION; CONFIGURATION; RELAXATION; CONVERSION; REDUCTION; STRENGTH;
D O I：
10.1016/j.dental.2012.01.007
中图分类号：
R78 [口腔科学];
学科分类号：
1003 ;
摘要：
Objectives. The aim of this study was to investigate the effect of variations in filler particle size and shape on the polymerization shrinkage-stress kinetics of resin-composites. Methods. A model series of 12 VLC resin-composites were studied. The particulate dispersed phase volume fraction was 56.7%: these filler particles were systematically graded in size, and further were either spherical or irregular. A Bioman instrument (cantilever beam method) was employed to determine the shrinkage-stress kinetics following 40 s irradiation (600 mW/cm2) at 23 degrees C (n = 3). All data were captured for 60 min and the final shrinkage-stress calculated. Results. Shrinkage-stress varied between 3.86 MPa (SD 0.14) for S3 (spherical filler particles of 500 nm) and 8.44 MPa (SD 0.41) for I1 (irregular filler particles of 450 nm). The shrinkage-stress values were generally lower for those composites with spherical filler particles than those with irregular filler particles. The differences in shrinkage-stress with filler particle size and shape were statistically significant (p < 0.001). Significance. Composites with spherical filler particles exhibit lower shrinkage-stress values compared to those with irregular filler particles. Shrinkage-stress and shrinkage-stress rate vary in a complex manner with variations in the size of the dispersed phase particles: a hypothesized explanation for the effect of filler particle size and shape is presented. (c) 2012 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：609 / 614
页数：6
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