Stage 2, Developing the
To help the student understand the relationship
between the amount of vertical overlap of the
anterior teeth and the occlusion of the posterior
To enable the students to develop a proper
To help students understand the importance of
bilateral balance in the stability of complete
That you may develop a “healthy philosophy”
toward complete denture care.
If these goals are to be met, it is
imperative that the students show up on
time for the classes and labs and stay
until they complete their projects. If a
student does not meet these criteria,
that student will have trouble working
with a complete denture patient in the
clinic. Lab instructors will not step in and
do all the work for you. If you are not
prepared, you may fall behind the rest of
When you work on the anatomic setup
of teeth for the complete dentures and
all procedures following that exercise
that utilizes those mounted casts, you
will turn in this project on the articulator
at the end of each lab period by placing
it in the cabinet at the front of the lab.
Failure to do so can result in disciplinary
action that may lead to failure of the
course and summer remediation.
When we finished the last lecture, we
had set the posterior teeth on a flat
In today’s lecture, you will learn to
adjust the posterior teeth so that you
can develop a curve to the posterior
teeth that will support a certain degree
of vertical overlap of the anterior teeth,
which will enhance anterior esthetics.
This setting of the teeth is called the
“compensating curve”, because it
compensates for the incisal guide angle of
the anterior teeth.
Anterior teeth with anatomic posterior
teeth are set to have a vertical overlap
equal to the compensating curve.
Ideally, this curve will be developed by raising
the distobuccal cusp of the maxillary 1st molar
to ½ mm above the occlusal plane, the
mesiobuccal cusp of the maxillary 2nd molar 1
mm above the plane, and the distobuccal cusp of
the maxillary 2nd molar 1½ mm above the plane.
When the plane is done properly, the maxillary
1st molar will provide the guide for the occlusal
surface of the 2nd molar. All cusps of both
molars should contact this plane.
When the maxillary posterior teeth are
adjusted to establish the compensating curve,
they are obviously positioned above the opposing
lower teeth when the pin is set at 0. The
mandibular molars are then raised to meet the
Don’t forget to adjust the lingual aspect of
the mandibular teeth also. The mandibular
teeth will have a lingual tilt to match the buccal
tilt of the maxillary teeth.
Here on the left, the second mandibular molar
is set with the buccal cusp too far to the buccal
of the maxillary 2nd molar’s central fossa. The
tip of a wax spatula is used to reposition it so
the cusps interdigitate at a better position.
Once the maxillary and mandibular posterior
teeth are properly adjusted, the maxillary
canines can be adjusted somewhat to close the
gap between them and the adjacent premolars.
The occlusal plane is again checked to see that
it is uniform on both sides.
The buccal aspects of the maxillary posterior
teeth should fall on a plane from the mid-buccal
of the canine back to the mesiobuccal cusp of
the 1st molar. The 1st molar will then deviate
20o to the palate and the buccal cusps of the 1st
& 2nd molars will lie along this plane.
These views of the teeth set on a compensating
curve demonstrate the overlap of the anterior
teeth in centric occlusion. The vertical component
is directly related to the combination of the cusp
angle, horizontal overlap and compensating curve.
The teeth must be bilaterally-balanced in CO.
Lateral movement must be independent of the
anterior teeth, with bilateral balance only on the
Protrusive movement involves both anterior and
posterior components, with simultaneous contacts
occurring on the anterior teeth and the
posterior teeth, when the anterior teeth are in
an end to end relationship. Movement to that
position must be bilaterally-balanced on the