The
pin positions
are chosen taking
this cast into
account. By drilling
pin-holes, there
is a secure and
immovable patient-analogous
transfer to the
dimensionally
stable Giroform®
plate.
The
pin-holes ensure
that the positional
information is
now stored. The
Giroform®
base plate serves
as a kind of memory
stick.
|
|
The
cast plaster tooth
arc is removed
from the base
plate after 30
minutes - ie.
before the onset
of plaster expansion.
This
allows the tooth
arc to expand
freely. However
after this, it
no longer matches
the drilled original
information on
the Giroform®
base plate.
|
|
After
sawing or separating
the tooth arc,
the pins again
fit into the drill-holes.
The
cut section serves
as an expansion
joint to accommodate
the expansion,
which is now restricted
to just the individual
segments, thus
no longer causing
distortion of
the tooth arc.
The
segmented model
therefore offers
a precision basis
for perfectly-fitting
work.
|
|
