36
CHECKBITE PROCEDURE
The mandibular cast is transferred to
the articulator by:
1. occluding it with the maxillary cast
2. checkbite procedure
3. a combination of the above
In the transfer of the mandibular cast to
the articulator, if the mandibular cast
can be occluded accurately in the
desired most intercusped position, the
most accurate way to transfer the
mandibular cast to the articulator is by
occluding it with the maxillary cast.
However, if deflective contacts exist in
the patient’s mouth, they must either be
removed by grinding prior to the time
impressions are taken so the cast can
be accurately oriented in the desired
most intercusped position or the centric
relation record must be taken at an
increased vertical dimension by check-
bite procedure.
There are many satisfactory recording
agents such as waxes, bite registration
pastes, etc., and many techniques with
which these agents can be employed to
advantage in checkbite registration pro-
cedures. However, there is no universal
method which proves optimum for all
situations. Therefore, the dentist must
be knowledgeable of the anatomy of the
related structures, neuromuscle physiol-
ogy, mandible manipulation techniques
and in the physical properties of the
dental materials employed which deter-
mine checkbite accuracy. This will
enable him to effect a method of choice
as varying situations present them-
selves.
It is not within the scope of this text to
present an exhaustive discourse on
checkbite procedure. However, one rec-
ommended procedure which effects
basic principles of checkbite techniques
is presented. Variations of this technique
can be employed as circumstances dic-
tate.
The following basic principles should
always be employed in any checkbite
technique.
1. The checkbite record should be
obtained as close to the vertical
dimension at which the restoration
is to be constructed as possible.
2. The dentist should always manipu-
late the patient’s mandible in
obtaining the checkbite. The
patient must not be instructed or
allowed to bite or close down in
such a manner as to cause flexion
of the mandible or movement of
teeth in obtaining the record.
3. The recording media interposed
between the teeth should be of a
dead soft consistency as the
mandible is brought to the desired
position. This prevents deflection
of the mandible and/or mobile
teeth, or the programming of mus-
cle function.
TECHNIQUE FOR WORKING CASTS
The following technique can be used to
register the mandiblular position at the
correct vertical dimension or at an
increased vertical dimension. It can be
used to register centric or eccentric
position. Described will be the registra-
tion of the centric relation position of the
mandible at the minimal increase of ver-
tical dimension which will result in lack
of posterior tooth contact.
Fabricate an occlusal programmer by
softening a small piece of base plate
wax in a water bath to a soft consisten-
cy and adapt it over several teeth in the
anterior segment of the mouth as illus-
trated in fig. 73. Manipulate the mandible
APPENDIX A
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