FIG. 54
FIG. 55
3.3 - INTEROCCLUSAL REGISTRATION
To set up the mandibular (lower) cast in the articulator, you
should have a record correlating the upper and lower dental
arches, according to the purpose of the mounting, in one of
the following ways:
Maximum Intercuspation (MI);
Centric Relation (CR);
These records can be made using material of the operator's
preference: wax, resins, addition or condensation silicon, etc.
(fig. 54 and 55)
To obtain the M.I registration, place the selected material to
register the patient's arcade and ask him to occlude.
There are several techniques to obtain the R.C registration,
i.e. Peter Dawson's technique (bilateral manipulation of the
mandible), Lucia's JIG technique and James Long (use of
plastic spacer) among others.
Note:
For totally edentureless patients, this registration is
made when the upper and lower wax rollers are joined based
on the correct dimensions of the patient.
3.4 - MOUNTING THE MANDIBULAR CAST
a) Place the Incisal Guide Pin in the Upper Frame of the
articulator with its rounded tip pointing downward so that
the upper and lower frames are parallel, i.e. on the zero
marking of the Incisal Guide Pin (fig. 56)
b) Now turn the articulator upside down on the laboratory
bench and affirm the lower cast, with retentions and
previously hydrated, upon the interocclusal register that
should be placed in the mounted upper cast (fig. 57). In
totally edentureless patients, this was obtained by
joining the wax rollers together.
c) We recommend fixing the casts with rubber bands or
staples (fixed with “godiva” or wax) so that they remain in
position until the plaster hardens. Place a small amount
of plaster on the lower part of the mandibular cast and a
small amount on the mounting plate of the lower frame of
the articulator to fill in the gap between them (fig. 58).
Wax registration
Silicon registration
FIG. 56
FIG. 57
FIG. 58
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