tg varnish is a Cavity Varnish, applied to the walls of the cavity, reduces the penetration of fluids into the tooth and the subsequent placed restoration.
The penetration of acid from the cement into the dentine, particularly with zinc
phosphate and silicate cements, is reduced when tg varnish is applied over
the floor of the cavity but when the layer is thin the thermal protection is
inadequate and more than one layer is recommended.
In general it is necessary to use two and
sometimes three thin layers of tgvarnish
to assure the continuation of the
film deposit over the surface of the cavity.
The presence of silicate adjacent to the
enamel wall gives an anticariogenic effect.
It is recommended that the varnish not be
applied over the enamel in cavities to be
restored with this cement.
tgvarnish for cavities can be of value for covering the dentine in shallow cavities
to be restored with a silica cement, without damaging the anticariogenic effect.
In the handling of deep cavities, especially when the pulp is exposed, it can be
convenient to place a previous protection, with calcium hydroxide, but before the
cavity base.