Ivoclar Vivadent Vectris User Manual
Page 49
49
3-
UNIT
INLA
Y
-
RET
AINED
BRIDGES
Fabricating the duplicate model for the vacuum forming process
For inlay-retained bridges, the abutment teeth are cut to obtain an appropriate cavity for the abutment/pontic contact
surface. Consequently, a duplicate model has to be prepared. The master model is utilized to contour the pontic (including
the pontic/abutment contact layer), to check the fit of the restoration and to veneer the framework. Pour the original
impression a second time and create a small duplicate model for the vacuum-forming process. Make sure to eliminate
undercut areas to facilitate the subsequent application of the Transil matrix.
In addition, reduce the cusps of the abutment teeth in such a way that the height of the cavity measures at least 0.5 mm
to enable the Vectris fibres to adapt to the cavity effectively. The height may be marked with a pencil to facilitate the
following reduction.
Fabricate a duplicate model from the original impression and eliminate undercut areas.
Mark the height of the cavity and reduce the cusps.
Completed duplicate model for the vacuum-forming process
– A silicone, polyether or similar material should be used for impression taking as these materials provide an
optimum reproduction of detail. Additionally, the impressions taken with these materials can be poured
several times.
– Hydrocolloid and alginate materials are unsuitable and cannot be poured more than once.