Two methods of transmission Fourier Transform Infrared analysis were compared to determine the degree of polymerization (DP) in unfilled Bis-GMA-based dental resins. Diluent concentration, curing mode, and activator type were investigated. DP ranged from 55-72% and was highest for the most diluted resins. The effects of polymerization activation mode and type were insignificant. DP was slightly enhanced in the bulk of the resin, as determined by a KBr-pellet technique, in comparison with results from a thin film method, but both techniques seem to provide useful and reproducible results for dental resins.
Get full access to this article
View all access options for this article.
References
1.
Asmussen, E.: Restorative Resins: Hardness and Strength vs. Quantity of Remaining Double Bonds, Scand J Dent Res90: 484-489, 1982.
2.
Asmussen, E.: Factors Affecting the Quantity of Remaining Double Bonds in Restorative Resin Polymers, Scand J Dent Res90:490-496, 1982.
3.
Bassiouny, M.A.: Temperature Rise During Polymerization of Photoactivated and Auto-activated Composite Resins, IADR Progr & Abst59:No. 647, 1980.
4.
Brauer, G.M.; Stansbury, J.W.; and Antonucci, J.M.: 4-N,N-Dialkylaminophenethanols-Alkanoic Acids and Esters. New Accelerators for Dental Composites, J Dent Res60 :1343-1348, 1981.
5.
Ferracane, J.L.; Newman, S.; and Greener, E.H.: Correlation of Strength and Degree of Polymerization of Unfilled Bis-GMA , IADR Progr & Abst61:No. 832, 1982.
6.
Ferracane, J.L.; Moser, J.B.; and Greener, E.H.: Color Stability of Unfilled Bis-GMA Resins Under UV Exposure, AADR Progr & Abst62:No. 453, 1983.
7.
Heigl, J.J.; Bell, M.F.; and White, J.N.: Application of Infrared Spectroscopy to the Analysis of Liquid Hydrocarbons , Anal Chem19:293-298, 1947.
8.
Ruyter, I.E. and Gyorosi, P.P.: An Infrared Spectroscopic Study of Sealants, Scand J Dent Res84:396-400, 1976.
9.
Ruyter, I.E. and Svendsen, S.A.: Remaining Methacrylate Groups in Composite Restorative Materials, Acta Odontol Scand36:75-82, 1978.
Stupp, S.I. and Weertman, J.: Characterization of Monomer to Polymer Conversion in Dental Composites , IADR Progr & Abst58:No. 949, 1979.
12.
Urbanski, J.; Czerwinski, W.; Janicka, K.; Majewska, F.; and Zowall, H.: Handbook of Analysis of Synthetic Polymers and Plastics, EnglandEllis Horwood Limited, 1977, pp. 403-413.
13.
Wu, W.: Degree of Cure and Wear Resistance of Dental Composites, IADR Progr & Abst62:No. 192, 1983.
