التفاصيل البيبلوغرافية
| العنوان: |
Effect of Time and Polymerization Cycle on the Degree of Conversion of a Resin Composite. |
| المؤلفون: |
Schneider, L. F. J., Consani, S., Ogliari, F., Correr, A. B., Sobrinho, L. C., Sinhoreti, M. A. C. |
| المصدر: |
Operative Dentistry; Jul/Aug2006, Vol. 31 Issue 4, p489-495, 7p, 1 Chart, 4 Graphs |
| مصطلحات موضوعية: |
POLYMERIZATION, DENTAL resins, COMPOSITE materials, DENTAL radiography, IRRADIATION, LIGHT emitting diodes |
| مستخلص: |
The aim of this investigation was to verify the influence of 3 light curing units on the degree of conversion, using different irradiation conditions: 1) manufacturers' recommended times of photo-activation, 2) standardizing total energy density among the units and 3) standardizing energy density at the 450-490 nm wavelength range among the units and the effect of these irradiation conditions on the post-cure. Three light curing units were used: halogen, light emitting diodes (LED) and xenon plasma. Seven groups were tested (n=6). Twenty-four hours after the photo-activation procedures, half of the composite specimens were submitted to Fourier Transformed Infrared Spectroscopy analysis. The other half was analyzed after 1 month. The results were submitted to 2-way ANOVA and Tukey's test (5%). Twenty-fore- hour analysis revealed that the second set of irradiation conditions produced a similar degree of conversion among the LCUs. After 1 month, the conversion values were statistically higher for 20 seconds of halogen exposure (increased from 46.78 to 49.66%), 20 seconds of LED exposure (from 46.20 to 51.15%), 30 seconds of LED exposure (from 48.29% to 50.68%) and 3 seconds of PAC exposure (from 42.57 to 51.39%). The initial degree of conversion and post-cure depended on the photo-activation condition applied. [ABSTRACT FROM AUTHOR] |
|
Copyright of Operative Dentistry is the property of Operative Dentistry and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| قاعدة البيانات: |
Supplemental Index |