Polymerization shrinkage of microfilled composites determined by laser beam scanning

被引：45

作者：

Fano, V ^{[1
]}

Ortalli, I ^{[1
]}

Pizzi, S ^{[1
]}

Bonanini, M ^{[1
]}

机构：

[1] UNIV PARMA,CLIN ODONTOIATR,I-43100 PARMA,ITALY

来源：

BIOMATERIALS | 1997年 / 18卷 / 06期

关键词：

composite resins; dental restorative materials; dimensional variations; laser application;

D O I：

10.1016/S0142-9612(96)00171-8

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

An He-Ne scanning laser beam was used to measure for the first time the linear shrinkage of light-cured microfilled composites. A low-power beam, which has a wavelength (632.8 nm) different from the polymerization wavelength (approximate to 450 nm), was used. In these conditions no shrinkage is induced by the laser light. This method of measurement makes it possible to analyse small samples with a very low error (+/-1 mu m). Five different materials were tested using 10-20 mg specimens, and the shrinkage process was examined in detail over 2 days. All these materials showed shrinkage of more than 50% of their original length after 1 min of irradiation and approximately 99% of the total shrinkage occurred 4h after irradiation. (C) 1997 Elsevier Science Limited.

引用

页码：467 / 470

页数：4

共 14 条

[1] A STUDY OF THE VOLUMETRIC SETTING SHRINKAGE OF SOME DENTAL MATERIALS [J].