38
function during the securing of the cen-
tric relation checkbite record, the dentist
should periodically gently arc the
mandible in small terminal hinge rotary
movements preceding the set of the
record media and immediately following
the set. Resistance to this movement
immediately prior to or after the set indi-
cates functions of the patient’s mandible
moving muscles and the checkbite
record should be discarded and a new
one taken. If resistance to this move-
ment is not encountered, the dentist can
be reasonable sure the patient did not
effect muscle function. This technique is
termed “dynamic technique” and the
record termed “dynamic checkbite”
because of the small movements of the
patients mandible executed by the den-
tist during the securing of the record.
The record media selected for this tech-
nique should allow an adequate, consis-
t
ent and not extended working time. It
should have a flash set to a hard con-
sistence that will fracture without warp-
ing so the parts can be accurately
reassembled if fractured. The material
should be of a dead soft consistency
when mixed but it must also have suffi-
cient body to resist flow so that it will
stay in place when positioned on the
teeth.
To facilitate the placement of the record
media on the occlusal surfaces of the
mandibular teeth construct small paper
cones from sheets of paper approxi-
mately 4 x 6 inches in dimension. Twist
the papter around the index finger as
illustrated in fig. 76 to fashion a cone
that has an opening at its large end
approximately 1-1/4 inches in diameter
(fig. 77A). The margin of the paper is
sealed with Scotch Tape so the paper
will not unwrap. The small end of the
fig. 75
fig. 76
fig. 77
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