Abstract
Resin-modified glass ionomers (RMGI) set by at least 2 mechanisms dependent upon reactant diffusion prior to gelation. Each reactiongs 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.
| Original language | English |
|---|---|
| Pages (from-to) | 82-86 |
| Number of pages | 5 |
| Journal | Journal of Dental Research |
| Volume | 89 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2010 |
Bibliographical note
Funding Information:The authors thank GC America for providing materials. This project was supported by NIH/NIDCR R25 grant DE015282. The views expressed in this manuscript are expressly those of the authors and do not represent the opinions of the US Air Force, the Department of Defense, or the US Government.
Keywords
- Acid-base reaction
- Polymerization
- Resin-modified glass ionomer
- Thermal analysis.
ASJC Scopus subject areas
- General Dentistry