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- Title
Resin-modified Glass-ionomer Setting Reaction Competition.
- Authors
Berzins, D. W.; Abey, S.; Costache, M. C.; Wilkie, C. A.; Roberts, H. W.
- Abstract
Resin-modified glass ionomers (RMGI) set by at least 2 mechanisms dependent upon reactant diffusion prior to gelation. Each reaction's kinetics and setting mechanism may rely on and/or compete with the other. In this study, we investigated RMGI setting reaction interactions using differential scanning calorimetry (DSC) by varying light-cure initiation times. A RMGI was analyzed with isothermal and dynamic temperature scan DSC with light-curing occurring immediately, or at 5 or 10 minutes after mixing as well as without light-activation. Results show that as time allowed for the acid-base reaction increased, the light-activation polymerization exotherm decreased. Conversely, analysis of DSC data suggests that earlier light-activation may limit the acid-base reaction and result in a different structured material. During early RMGI development, acid-base and light-polymerization reactions compete with and inhibit one another.
- Subjects
DENTAL research; DENTAL resins; IONOMERS; DENTAL glass ionomer cements; POLYMERIZATION; ACID-base chemistry; THERMAL analysis; DENTAL materials
- Publication
Journal of Dental Research, 2010, Vol 89, Issue 1, p82
- ISSN
0022-0345
- Publication type
Article
- DOI
10.1177/0022034509355919