Use a Biostar Brush with Magnet (016-021), to
remove excess pellets, and level the pellet line
from the occlusal-incisal plane to the top rim of
the cup.
Hold the brush at an angle to sweep excess pellets
from the rim of the cup and the palatal area of the
model. Sweep excess pellets around the outside of
the cup to fall in to the pellet drawer (red arrows).
Note: The pellet level should always be to the
top of the cup. The height of the model in the
pellets will change with various applications.
When constructing an orthodontic retainer
(i.e., a Hawley), the pellets placed against the
occlusal-incisal margin cover the wax holding
the wires facially, and act as an insulator when
the heated material is formed.
Improper packing of a model can cause a blowout,
air leak, or machine malfunction. It is important that
there is no sudden drop of the pellet margin at the
inner cup wall, or that the model is not positioned
too high or too low within the cup. This allows the
material to be overstretched, thinning it to where a
hole is created and air blows through. In some
instances, a large air leak could cause inferior
material adaptation that can result in a loose-tting
appliance.
Models attached to articulator mountings may
be referenced slightly higher than indicated.
Mounted models should be split cast. If the model
cannot be removed from the mounting, the pellet
level will need to be at a slight incline to appliance
termination areas.
Note: Make sure the top rim of the cup remains
pellet free. This will provide proper closure and
lockdown of the pressure chamber.
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