Degree of conversion of Z250 composite determined by fourier transform infrared spectroscopy: comparison of techniques, storage periods and photo-activation methods
The purpose of this study was to evaluate the degree of conversion (DC) of the Z250 composite, using six photo-activation methods, two storage periods and two preparation techniques of the FTIR specimens (n = 3). For the KBr pellet technique, the composite was placed into a metallic mold and photo-activated as follows: continuous light, exponential light, intermittent light, stepped light, PAC and LED. The measurements were made after 24 h and 20 days. For the resin film technique, approximately 0.07 g of the composite was pressed between two polyester strips, photo-activated as above described and analyzed. The DC was calculated by the standard technique and submitted to ANOVA and Tukey's test (alpha = 5%). Independently of the storage period and specimen preparation technique, there were no significant differences among photo-activation methods. No statistical difference was observed between the time periods used. The specimens analyzed under the KBr pellet technique presented higher DC values than those analyzed by the resin film technique.
Main Authors: | Obici,Andresa Carla, Sinhoreti,Mário Alexandre Coelho, Frollini,Elisabete, Correr Sobrinho,Lourenço, Consani,Simonides |
---|---|
Format: | Digital revista |
Language: | English |
Published: |
ABM, ABC, ABPol
2004
|
Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392004000400014 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Similar Items
-
Evaluation of mechanical properties of Z250 composite resin light-cured by different methods
by: Obici,Andresa Carla, et al.
Published: (2005) -
Effect of different photo-initiators and light curing units on degree of conversion of composites
by: Brandt,William Cunha, et al.
Published: (2010) -
Evaluation of depth of cure and Knoop hardness in a dental composite photo-activated using different methods
by: Obici,Andresa Carla, et al.
Published: (2004) -
Infrared spectroscopy: a tool for determination of the degree of conversion in dental composites
by: Moraes,Luciene Gonçalves Palmeira, et al.
Published: (2008) -
Fourier transform infrared spectroscopy : applications to chemical systems /
by: Ferraro, John R., 1918-, et al.
Published: (1978)