Lecture 10: Occlusal Spectrum for Dentures

Question 1

What two concepts is the “choice of occlusion” based on?

Answer 1

Scientific basis, which is the preferred relation and Habit/Bias, which is the non-preferred relation. the latter is based on the bias of the individual choosing.

Question 2

How is time considered a factor in relation to denture occlusion?

Answer 2

1. occlusion at the time of delivery
2. occlusion over the long term
   - -> ridge changes (recession) 6 mo after denture is first used therefore revisions may need to be made later

Question 3

Explain the relationship of the remaining soft tissue to the occlusal load.

Answer 3

The denture bearing structure is equivalent to the resilient soft tissue and the occlusal load causes for the movement of the denture therefore the relationship is not static, a lot of movement is involved in how the upper & lower teeth meet.

Question 4

The occlusal spectrum is made off the findings of which two lads?

Answer 4

Parr G.R and Loft G. H

Question 5

Whats the difference between the patient spectrum and the occlusal spectrum?

Answer 5

The patient spectrum is based on the patients needs and desires (esthetics, oral health & stability etc) while the occlusal spectrum is based on their jaw movements and how a certain occlusion scheme may better suit the functionality and comfort of their denture.

Question 6

What are the 5 occlusal schemes within the spectrum?

Answer 6

1. Anatomic (balanced)
2. Semi- anatomic (balanced)
3. Lingualized (balanced/nonbalanced)
4. nonatomic (balanced)
5. Neutrocentric (nonbalanced)

Question 7

What does balanced occlusion mean?

Answer 7

Teeth are in contact at all times; in centric, protrusive and laterotrusive positions.

Question 8

What is a nonbalanced occlusion?

Answer 8

Tooth contact in the opposing arch is not necessary. A cusp hitting a flat surface

Question 9

What is the Semi-Anatomic occlusal scheme?

Answer 9

analogous to a dentition that is slightly warn (20 degrees)

Question 10

What is the Non-anatomic occlusal scheme?

Answer 10

flat teeth with no anatomy

Question 11

What are the two concepts used to establish balanced denture occlusion?

Answer 11

1. Articulator generated concept

2. Functionally generated concept

Question 12

How does the Articulator Generated Concept establish balanced denture occlusion?

Answer 12

1. Hanau’s quint:
   (Condylar Guidance x Incisal Guidance) / (Occlusal Plane x Compensating Curve x Cusp Height)
2. Positional records:
   - Centric interocclusal record
   - Eccentric records (lateral or protrusive) for condylar inclination
   - Facebow transfer to establish cranial base to mandible

Question 13

How does an articulator generated non anatomic balanced occlusion denture differ in structure form an anatomic denture?

Answer 13

The denture in NONANATOMIC (flat occlusal table) has an exaggerated Curve of Spee so that the posterior teeth are in contact during protrusive movements. (opposite of christensen’s phenomena)

Question 14

How does the Functionally Generated Concept establish balanced denture occlusion?

Answer 14

In the functionally generated concept, condylar inclination is not critical. It uses:
- Meyers chew in
- functional records
to create functional molds that are similar to the patients normal jaw movements.

Question 15

What are the advantages of anatomic occlusion?

Answer 15

1. Better esthetic presentation
2. Ease of bolus penetration
3. correction with TMJ
4. Definite “home” position

Question 16

What are the DISadvantages of anatomic occlusion?

Answer 16

1. precise records required
2. greater lateral forces generated
3. balanced may be short lived
4. difficult for class II & class III patients

Question 17

What is a Lingualized occlusion?

Answer 17

can be either balanced (posterior contact in protrusion) or nonbalanced. Vertical dimension is established and maxillary teeth are set against a mandibular tooth that has a flat plane.
Max teeth have functional lingual cusps.

Question 18

What are the advantages of Lingualized occlusion?

Answer 18

1. Better Esthetic presentation
2. Increased bolus penetration.
3. SImple technique
4. Less lateral forces
5. Area of closure.
6. Adaptable to class II & class III patients

Question 19

What is a Neutrocentric Occlusion?

Answer 19

nonbalanced - cuspless teeth used in posterior which mash instead of sheer food.

Question 20

What are the advantages of Neutrocentric occlusion?

Answer 20

1. Simple technique
2. Decreased lateral forces
3. Area of closure
4. Adaptable to class II and class III patients
5. More stable long term

Question 21

What are the DISadvantages of Neutrocentric occlusion?

Answer 21

1. Less esthetic presentation
2. poor bolus penetration
3. Encourages lateral chewing
4. No definite closure position.

Question 22

What’s the range of the Patient Spectrum mainly based on?

Answer 22

Age:

1. Young
   - healthy, good ridges, good oral dexterity and awareness, firm mucosa, interested in esthetics
2. Middle aged
   - average health, resorbed but adequate ridges, some areas of mobile tissue, average oral awareness, average oral dexterity, average interest in esthetics
3. Elderly
   - poor health, poor ridges, mobile friable tissues, poor oral awareness, poor oral dexterity, little interest in esthetics

Question 23

What are the factors to consider when choosing an occlusal scheme? there are 9.

Answer 23

1. ridge size
2. ridge shape,
3. maxillo-mandibular relation
4. muscular coordination.
5. physical or mental condition
6. previous dentures *** this is important, stick with what they’re used to
7. complicating anatomic conditions
8. desires of the patient
9. skill of the dentist

Question 24

T/F. Occlusal spectrum must be considered separate from patient spectrum.

Answer 24

FALSE! occlusal spectrum MUST BE RELATED TO patient spectrum