Dent 482

1
Dent 482 Complete Dentures
Stage 2, Developing the Compensating Curve
2
Purpose

• To help the student understand the relationship
  between the amount of vertical overlap of the
  anterior teeth and the occlusion of the posterior
  teeth.
• To enable the students to develop a proper
  compensating curve.
• To help students understand the importance of
  bilateral balance in the stability of complete
  dentures.

That you may develop a healthy philosophy
toward complete denture care.
3
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 your classmates.
4
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.
5
When we finished the last lecture, we had set
the posterior teeth on a flat plane.
6
In todays 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.
7
This setting of the teeth is called the
compensating curve, because it compensates for
the incisal guide angle of the anterior teeth.
8
Anterior teeth with anatomic posterior
teeth are set to have a vertical overlap equal to
the compensating curve.
9
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.
10
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.
11
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 maxillary
teeth.
12
Dont 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.
13
Here on the left, the second mandibular molar
is set with the buccal cusp too far to the buccal
of the maxillary 2nd molars central fossa. The
tip of a wax spatula is used to reposition it so
the cusps interdigitate at a better position.
14
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.
15
The occlusal plane is again checked to see that
it is uniform on both sides.
16
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.
17
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.
18
Lateral movement must be independent of the
anterior teeth, with bilateral balance only on
the posterior teeth.
19
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 posterior teeth.
20
(No Transcript)