GC EUROPE G-aenial - Manual (Page 7)

7 G-ænial Anterior & Posterior Technical Manual
4.3 interfaces
to improve the bond between the silica and matrix
resin, the silica surfaces are treated hydrophobically
with dimethyl constituents rather than with silanol.
this hydrophobic treatment improves the intimate
contact between the silica and the matrix because
both ingredients will attract each other. moreover,
this type of dimethyl-treated silica is 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 glass used in G-ænial
Posterior is silanated.
three types of interaction occur at the pre-
polymerized filler and resin matrix interface, helping
to prevent disruption of the fillers and thereby
maintaining the long-term integrity of the restoration
in time.
the three types of interaction are as follows:
1 covalent bonds derived from residual c=c.
2 hydrogen bonds from polar constituents, such as –Oh, –nh, and -c=O.
3 hydrophobic interactions between organic groups (e.g. alkyls).
4.4 initiators
G-ænial uses a combination of camphorquinone and amine as the catalyst. light activation can
be carried out with quartz halogen, plasma or leD curing units.