Posterior Tooth Selection and Arrangement Flashcards
How does denture occlusion differ from natural occlusion?
Natural Occlusion - plan for disclusion of posterior teeth when the patient moves into an excursive position.
Denture Occlusion - No plan for disclusion of posterior teeth
What are the 2 basic occlusal schemes for dentures?
- Balanced Occlusion
2. Non balanced occlusion
What is Balanced Occlusion?
refers to the planned contact of teeth on both sides when the denture teeth are in an excursive position
What are the 4 classifications of complete denture posterior tooth forms
- Anatomic
- Semi-anatomic
- non-anatomic
- Lingual contact (lingualized occlusion)
What is the ANATOMIC posterior tooth form in complete dentures?
teeth with cusp angles of 30 degrees or more arranged similar to natural dentition
What is the SEMI-ANATOMIC posterior tooth form in complete dentures?
Teeth with cusp angles of 10-20 degrees
What is the NON-ANATOMIC posterior tooth form in complete dentures?
teeth with 0 degree, no cusps.
What is difficult to achieve in non-anatomic posterior tooth form in complete dentures?
Balanced Occlusion
What is the LINGUAL CONTACT posterior tooth form in complete dentures?
Cusped maxillary teeth and shallow cusped mandibular teeth
What is a benefit of lingual contact of posterior tooth from in complete dentures?
can accommodate either balanced or non-balanced occlusion scheme
What posterior tooth form in complete dentures is used when balanced occlusion is desired?
Anatomic or Lingual contact
Why don’t we want anterior contact in a denture set up?
It dislodges dentures posteriorly. This increases the potential for traumatic anterior contact and increased maxillary ridge resportion
What is nonbalanced occlusion?
a concept where maximum tooth contact is achieved at centric occlusion without emphasis on the contact in eccentric positions.
What are the 3 patient factors that may influence the choice of the occlusal scheme?
- Neuromuscular control
- anteroposterior and mediolateral jaw relationship
- Esthetics
Explain how neuromuscular control influences occlusal scheme?
the more difficult it is to determine and record a repeatable jaw position the less likely a tightly interdigitated tooth arrangement will be successful
Explain how Class 2 and 3 skeletal patients provide problems for dentures
Class 2 skeletal patients may habitually position the mandible in anterior-posterior patients for different activities (speech, swallowing, chewing) which makes interdigitation at one retruded position a problem. Class 3 is the same thing.
Explain how posterior tooth position affects esthetics?
The presence of a cusp contributes to a natural appearance of the buccal corridor (premolar region). To enhance esthetics, maxillary posterior teeth with buccal cusps are generally preferred.
What posterior tooth form in dentures should we use for nonbalanced occlusion?
cuspless tooh form
What is a popular nonblanaced occlusal scheme?
MONOPLANE OCCLUSION
What are the 5 advantages to MONOPLANE occlusion?
- more adaptable to class 2 and 3 jaw relationships
- easier to use when a discrepancy in jaw widths indicates a need for a cross bite relationship
- provides the patient with a sense of freedom due to the lack of interdigitation
- allows us to use a simplified technique
- provide some accommodation for the setting of dentures with ridge loss over time.
In what case would we not need a facebow record for dentures in monoplane occlusion?
If the vertical dimension is not altered once the CR record is made
What are the 4 factors that influence the position of the occlusal plane in monoplane occlusion (in order of importance)?
- Anterior determinant is the incisal edge height of the mandibular canines
- Posterior determinant should lie at the junction of the upper and middle thirds of the retromolar pads.
- the space between the upper and lower jaws should be divided relatively equal
- the occlusal plane should parallel the mean plane of the residual ridge.
