Abstract
Since their introduction in 1996, dental-light cured flowable composites have been used as restorative materials for filling and repairing minimally invasive cavities. They are commonly used because they are insoluble, aesthetic, insensitive to dehydration, easy to manipulate, and reasonably inexpensive. Various brands advertise multiple advantages and are comprised differently. One property prior flowable composites exhibited was a significant polymerization shrinkage, which makes it unsuitable for occlusal wear. In this project, we analyzed the marginal shrinkage and stability of three different types of composites: CLEARFIL MAJESTY ES Flow, Genesis Flowable Light Cure Composite, and GrandioSO Heavy Flow. The composites were cured with blue light from a halogen light curing unit and then analyzed by chromatography –using Shimadzu Gas Chromatograph GC-2010 System (DSC)—and Thermogravimetry (TGA) –using a TGA-50 Shimadzu Thermogravimetric Analyzer. DSC scans show no exotherms, suggesting no residual activity and reorganization of these polymers, related to their reported marginal shrinkage. TGA shows different mass losses, accounting for their stability and the amount of fluoride released by this technique.
Faculty Sponsors
Maria Ballester, Ph.D.
Project Type
Event
Location
Alvin Sherman Library
Start Date
4-10-2015 1:00 PM
End Date
4-10-2015 5:30 PM
DSC and TGA Analysis on 3-Flowable Dental-Light Cured Restorative Composite
Alvin Sherman Library
Since their introduction in 1996, dental-light cured flowable composites have been used as restorative materials for filling and repairing minimally invasive cavities. They are commonly used because they are insoluble, aesthetic, insensitive to dehydration, easy to manipulate, and reasonably inexpensive. Various brands advertise multiple advantages and are comprised differently. One property prior flowable composites exhibited was a significant polymerization shrinkage, which makes it unsuitable for occlusal wear. In this project, we analyzed the marginal shrinkage and stability of three different types of composites: CLEARFIL MAJESTY ES Flow, Genesis Flowable Light Cure Composite, and GrandioSO Heavy Flow. The composites were cured with blue light from a halogen light curing unit and then analyzed by chromatography –using Shimadzu Gas Chromatograph GC-2010 System (DSC)—and Thermogravimetry (TGA) –using a TGA-50 Shimadzu Thermogravimetric Analyzer. DSC scans show no exotherms, suggesting no residual activity and reorganization of these polymers, related to their reported marginal shrinkage. TGA shows different mass losses, accounting for their stability and the amount of fluoride released by this technique.
