Influence of the photoinitiator system and light photoactivation units on the degree of conversion of dental composites
Braz. oral res
; 24(4): 475-481, Oct.-Dec. 2010. ilus, tab
Article
in English
| LILACS
| ID: lil-569229
Responsible library:
BR1.1
ABSTRACT
The aim of this study was to observe the influence of two light polymerization units (LED or halogen light) on the degree of conversion (DC) of three dental composites with lighter shades and a different photoinitiator system. The top (T) and bottom (B) surfaces of 60 discs of composite resin (Filtek Supreme, Filtek Z250, Tetric Ceram Bleach) cured either by LED or by halogen lamp (HL) were studied using an FT-Raman spectrometer. The degree of conversion (DC) was evaluated by following the changes in the intensity of the methacrylate C=C stretching mode at 1640 cm-1. The calculated DC ranged from 54.2 percent (B) to 73.4 percent (T) and from 60.2 percent (B) to 76.6 percent (T) for the LED and HL, respectively. LED and halogen devices were able to produce an adequate DC for all the resins tested.
Full text:
Available
Collection:
International databases
Database:
LILACS
Main subject:
Composite Resins
/
Curing Lights, Dental
/
Photoinitiators, Dental
/
Polymerization
Language:
English
Journal:
Braz. oral res
Journal subject:
Dentistry
Year:
2010
Document type:
Article
/
Project document