Contraction stress related to degree of conversion and reaction kinetics

被引：212

作者：

Braga, RR

Ferracane, JL

机构：

[1] Oregon Hlth Sci Univ, Sch Dent, Dept Biomat & Biomech, Portland, OR 97201 USA

[2] Univ Sao Paulo, Dept Dent Mat, BR-05508900 Sao Paulo, Brazil

来源：

JOURNAL OF DENTAL RESEARCH | 2002年 / 81卷 / 02期

关键词：

composites; polymerization; contraction stress; volumetric shrinkage;

D O I：

10.1177/154405910208100206

中图分类号：

R78 [口腔科学];

学科分类号：

1003 ;

摘要：

Polymerization shrinkage of composites bonded to cavity preparations generates stress on the tooth/restoration interface. The purpose of this study was to verify the influence of degree of conversion and speed of polymerization reaction on contraction stress. We prepared experimental composites with different curing rates by varying the concentration of inhibitor (butylated hydroxytoluene). We verified the effect of degree of conversion by submitting one of the composites to different photo-activation times. Contraction stress was monitored for 10 minutes in a tensilometer. Fourier-transformed infrared spectrometry was used for assessment of the degree of conversion. Volumetric shrinkage was determined by means of a mercury dilatometer. Degree of conversion and volumetric shrinkage showed a non-linear relationship with energy density. Degree of conversion showed a pronounced influence on stress. Increased inhibitor concentration reduced curine, rate and contraction stress in composites, without compromising the final degree of conversion.

引用

页码：114 / 118

页数：5

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