GC EUROPE Kalore - Manual (Page 8)

8 GC Kalore technical manual
4.3 Interface
The interface between the pre-polymerized fillers and the resin matrix is a critical factor. In KALORE
there are three types of interactions at this interface that help to prevent early catastrophic failure.
the three types of interactions are as follows:
1. Covalent bonds derived from C=C. Both the pre-polymerized fillers and methacrylate matrix
monomers contain c=c groups which can cross-link with each other. although the methacrylates
are mostly cured, residual c=c groups still remain.
2. hydrogen bonds from polar constituents, such as -Oh, -nh, and -c=O.
3. hydrophobic interactions between organic groups (e.g., alkyls). these interactions result in
intimate contacts rather than strong bonds. each contact is relatively moderate, however the
total contribution of these contacts should be considered.
the silica surfaces are treated hydrophobically with dimethyl constituents, to attract the silica and
matrix to each other and increase their intimate contact. Dimethyl-treated silica is also more stable
than silica treated with methacryloxysilane, resulting in an improved shelf life with less risk of
stiffening of the material during storage.
the fluoroaluminosilicate and strontium glasses used in KalORe are silanated.
4.4 Initiators
a combination of camphorquinone and amine is used as the catalyst. light activation can be
carried out with quartz halogen, plasma or leD curing units.
5.0 Physical Properties
KalORe has been formulated to reduce polymerization shrinkage and shrinkage stress while still
providing excellent handling and esthetics.