Contraction stress, elastic modulus, and degree of conversion of three flowable composites

被引：19

作者：

Cadenaro, Milena ^{[1
]}

Codan, Barbara ^{[1
]}

Navarra, Chiara O. ^{[1
]}

Marchesi, Giulio ^{[1
]}

Turco, Gianluca ^{[1
]}

Di Lenarda, Roberto ^{[1
]}

Breschi, Lorenzo ^{[1
,2
]}

机构：

[1] Univ Trieste, Unit Dent Sci & Biomat, Dept Biomed, I-34129 Trieste, Italy

[2] IOR, Unit Bologna, IGM CNR, Bologna, Italy

来源：

EUROPEAN JOURNAL OF ORAL SCIENCES | 2011年 / 119卷 / 03期

关键词：

degree of conversion; elastic modulus; flowable composites; stress; POLYMERIZATION SHRINKAGE STRESS; RESIN-COMPOSITES; DENTAL COMPOSITES; RESTORATIVE MATERIALS; FLEXURAL PROPERTIES; FILLED ADHESIVES; LIGHT-INTENSITY; WATER-STORAGE; IN-VITRO; C-FACTOR;

D O I：

10.1111/j.1600-0722.2011.00820.x

中图分类号：

R78 [口腔科学];

学科分类号：

1003 ;

摘要：

The aim of this study was to measure the contraction stress of three flowable resin composites and to correlate the stress with the elastic modulus and the degree of conversion. One low-shrinkage (Venus Diamond Flow) and two conventional (Tetric EvoFlow and X-Flow) flowable composites were polymerized for 40 s with a light-emitting diode (LED) curing unit. Contraction force was continuously recorded for 300 s using a stress-analyser, and stress values were calculated at 40 s and at 300 s. The maximum stress rate was also calculated for each specimen. The elastic modulus of each composite was assayed using a biaxial flexural test, and degree of conversion was analysed with Raman spectroscopy. X-Flow exhibited higher stress values than the other tested materials. Venus Diamond Flow showed the lowest stress values at 40 s and at 300 s, and the lowest maximum stress rate. Stress values were correlated with elastic modulus but not with degree of conversion, which was comparable among all tested materials.

引用

页码：241 / 245

页数：5