Polyacid Modified Resin Composites, so-called Compomers, are very prospective materials for direct filling in restorative dentistry. They are composed from polymer matrix, reinforced with fluoro-alumino-silicate glass particles. Commercial compomers taken into consideration during the study were: Compoglass F (Ivoclar-Vivadent), Dyract AP (DeTrey Dentsply), Hytac (3M-ESPE), Glasiosite (VOCO), Freedom (SDI) and Luxat (DMG). Polymerization time of disc-shaped, light-cured specimens was 40 s according to manufacturer’s recommendations. These six samples of light-cured dental compomers were examined using photoelectron spectroscopy, Fourier transform infrared spectroscopy and Raman scattering.
The XPS permits qualitative and quantitative analysis of all elements in the periodic table (except H and He) and has the advantage of showing the binding energy of emitted photoelectrons, depending on the chemical environment in which the element occurs. The major elements composing all measured polymers are: C, O, N, Al, Si, P and F. Others trace elements were indicated: Na, Ca was present in polymer C, H and L, Ba in C and G polymer, Sr in D polymer, Fe in polymer F, Zn in polymer F and H and S in polymer G and H. The ratios: Al/Si ranged from 0.04 (polymer G1) to 0.84 (polymer C); F/Si ranged 0.03 (polymer G1) to 1.84 (polymer C). The relative value of F/Al and F/Si ratio were found to vary from low (0.7 for Freedom) to high (5.15 for Hytac) and from 0.03 (Glasiosite) to 1.84 (Compoglass F), respectively.
Infrared and Raman spectroscopy proved particularly suitable for evaluating the molecular structure and crystallinity of PMRC polymers and structural changes in time (especially related to liberation of fluorine). In this study we present a set of micro-FTIR and micro-Raman spectra with group frequency interpretation and relative qualitative analysis. This long lasting research is in early stages of development and only preliminary results will be presented.

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