Posterior Tooth Selection and Arrangement

Question 1

How does denture occlusion differ from natural occlusion?

Answer 1

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

Question 2

What are the 2 basic occlusal schemes for dentures?

Answer 2

1. Balanced Occlusion

2. Non balanced occlusion

Question 3

What is Balanced Occlusion?

Answer 3

refers to the planned contact of teeth on both sides when the denture teeth are in an excursive position

Question 4

What are the 4 classifications of complete denture posterior tooth forms

Answer 4

1. Anatomic
2. Semi-anatomic
3. non-anatomic
4. Lingual contact (lingualized occlusion)

Question 5

What is the ANATOMIC posterior tooth form in complete dentures?

Answer 5

teeth with cusp angles of 30 degrees or more arranged similar to natural dentition

Question 6

What is the SEMI-ANATOMIC posterior tooth form in complete dentures?

Answer 6

Teeth with cusp angles of 10-20 degrees

Question 7

What is the NON-ANATOMIC posterior tooth form in complete dentures?

Answer 7

teeth with 0 degree, no cusps.

Question 8

What is difficult to achieve in non-anatomic posterior tooth form in complete dentures?

Answer 8

Balanced Occlusion

Question 9

What is the LINGUAL CONTACT posterior tooth form in complete dentures?

Answer 9

Cusped maxillary teeth and shallow cusped mandibular teeth

Question 10

What is a benefit of lingual contact of posterior tooth from in complete dentures?

Answer 10

can accommodate either balanced or non-balanced occlusion scheme

Question 11

What posterior tooth form in complete dentures is used when balanced occlusion is desired?

Answer 11

Anatomic or Lingual contact

Question 12

Why don’t we want anterior contact in a denture set up?

Answer 12

It dislodges dentures posteriorly. This increases the potential for traumatic anterior contact and increased maxillary ridge resportion

Question 13

What is nonbalanced occlusion?

Answer 13

a concept where maximum tooth contact is achieved at centric occlusion without emphasis on the contact in eccentric positions.

Question 14

What are the 3 patient factors that may influence the choice of the occlusal scheme?

Answer 14

1. Neuromuscular control
2. anteroposterior and mediolateral jaw relationship
3. Esthetics

Question 15

Explain how neuromuscular control influences occlusal scheme?

Answer 15

the more difficult it is to determine and record a repeatable jaw position the less likely a tightly interdigitated tooth arrangement will be successful

Question 16

Explain how Class 2 and 3 skeletal patients provide problems for dentures

Answer 16

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.

Question 17

Explain how posterior tooth position affects esthetics?

Answer 17

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.

Question 18

What posterior tooth form in dentures should we use for nonbalanced occlusion?

Answer 18

cuspless tooh form

Question 19

What is a popular nonblanaced occlusal scheme?

Answer 19

MONOPLANE OCCLUSION

Question 20

What are the 5 advantages to MONOPLANE occlusion?

Answer 20

1. more adaptable to class 2 and 3 jaw relationships
2. easier to use when a discrepancy in jaw widths indicates a need for a cross bite relationship
3. provides the patient with a sense of freedom due to the lack of interdigitation
4. allows us to use a simplified technique
5. provide some accommodation for the setting of dentures with ridge loss over time.

Question 21

In what case would we not need a facebow record for dentures in monoplane occlusion?

Answer 21

If the vertical dimension is not altered once the CR record is made

Question 22

What are the 4 factors that influence the position of the occlusal plane in monoplane occlusion (in order of importance)?

Answer 22

1. Anterior determinant is the incisal edge height of the mandibular canines
2. Posterior determinant should lie at the junction of the upper and middle thirds of the retromolar pads.
3. the space between the upper and lower jaws should be divided relatively equal
4. the occlusal plane should parallel the mean plane of the residual ridge.