Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

D1 Spring - Occlusion & Fixed Pros. > 3/13: Optimal Functional Occlusion > Flashcards

3/13: Optimal Functional Occlusion Flashcards

1
Q

What are the factors that contribute to the baseline for evaluating a patient’s occlusion?

A

Teeth
TMJ
Musculature

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

If a patient has an orthodontically ideal angles class I occlusion, this does/does not mean that the patient has optimal occlusal contacts, optimal condyle/mandibular position, and ideal/optimal contact in exursive moments

A

Does not

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Someone with a class II or class III occlusion although not orthodontically ideal, may have _________ occlusion

A

Functional

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Patients may have a less than ideal occlusion, however, it may still be a ________ occlusion or a _________________ occlusion

A

Functionally acceptable; physiologically acceptable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

If treatment is rendered, what do you consider

A

The optimal position for the joints, muscles and teeth (CR)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

When are the TM joints in optimum, orthopedically stable joint position?

A

When the mandible is in centric relation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is centric relation?

A

Position of the condyles in relation to the disc and fossa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is centric relation defined as?

A

When the condyles are in the most anterosuperior position in the glenoid fossa

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What does centric relation refer to?

A

The joints and does not involve teeth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Bow does the mandible arc up?

A

Freely up and down along the terminal hinge axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is deflection?

A

Teeth cannot contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Why is CR the ideal position?

A

Musculature in centric relation
TMJs in centric relation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How do the muscle function in CR?

A

Harmoniously

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the joint like in centric relation?

A

Stable because the muscles attached to the joint prevent dislocation of the articular surfaces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What muscles stabilize the TMJ?

A

Masseter and the medial pterygoids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does contraction of the muscles that stabilize the TMJ result in?

A

Antero-superior vector of force (stability)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What muscles are most relaxed in CR?

A

Lateral pterygoid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What do the condyles rest against in centric relation?

A

Posterior slope of the articular eminence (thickest bone) therefore can tolerate higher stresses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What do condyles rest against in centric relation?

A

Intermediate zone of the disc (non-innervated and avascular zone) therefore higher stresses can be toelrated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What was CR called in the past?

A

The most retruded position of the mandible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What are tissues like in the most retruded position?

A

The retrodiscal tissues are innervated and would not tolerate stresses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What is the posterior wall like in the most retruded position?

A

Very thin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

How do muscles function in centric relation?

A

Harmoniously

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What position are the TMJs in in centric relation?

A

Optimal, orthopedically stable joint position

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What can the TMJ withstand?

A

The TMJ is stable even when heavy loads/forces are applied

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What do we restore in centric relation?

A
  • completely edentulous patient
  • partially edentulous patients when there are few teeth remaining that there is not a stable MIP
  • dentate patients who are going to receive extensive restorations which will alter their occlusion completely
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

What do you use to deprogram the muscles of mastication?

A

Anterior deprogrammer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What three things are necessary for optimal functional occlusion?

A
  1. The TMJ
  2. The teeth
  3. The excursive movements
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

What are teeth relations in optimal functional occlusion?

A
  • stationary position
  • during excursive movements
30
Q

What is the most desirable position of the posterior teeth?

A

Multiple, even, bilateral. and simultaneous occlusal contacts with the mandible in the CR position are the most desirable

31
Q

Where are posterior teeth loaded?

A

Mainly along the long axis of the tooth (axial loading)

32
Q

What happens when more teeth contact?

A

More stress is distributed throughout the arch

33
Q

What happens when all posterior teeth contact evenly?

A

Distributed the stress over all the teeth and does not concentrate it on one tooth causing harm

34
Q

What happens when the teeth are bilateral?

A

For stability; if tooth contacts occur only on the right side and not the left, then the mandible will pivot around this right side contact and place increased pressure on the left TMJ causing problems

35
Q

What happens when the teeth have simultaneous contact?

A

All the contacts occur at the same time on both sides of the arch and on all the posterior teeth

36
Q

What does it mean when the teeth are axially loaded?

A

Through the long axis of the tooth

37
Q

What forces are not well accepted?

A

Lateral forces on teeth

38
Q

When can heavier stresses be applied?

A

Through axial loading

39
Q

What teeth should have lighter occlusal contacts and when?

A

Anterior when posterior teeth are in occlusion

40
Q

Why can anterior teeth not be able to withstand high loads?

A

When loaded axially

41
Q

What is canine guidance?

A

When the mandible moves laterally, the canines on the working side guide the movement, causing all other teeth to disclude

42
Q

What is anterior guidance?

A

In protrusive movement, the anterior teeth should disclude the posterior teeth

43
Q

What do the canines, central and lateral incisors do when the mandible moves in protrusion?

A

Disclude

44
Q

What are contacts between the posterior teeth during extrusive movements considered?

A

Interferences
- can create damaging effects on T teeth and periodontium

45
Q

The more anterior (away from the fulcrum), the resistance (load) occurs, the ________ the impact (magnitude)

A

LEsser

46
Q

What tooth has the longest root and best bone support?

A

canine (canine eminence)

47
Q

What is optimal functional occlusion also referred to as?

A

Mutually protected occlusion

48
Q

Multiple, even, bilateral, simultaneous occlusal contacts of the posterior teeth in MIP with the mandible is _______ position. _____ and ____ are coincident

A

MIP; MIP and CR

49
Q

What teeth exhibit lighter occlusal contacts in MIP

A

Anterior

50
Q

How are posterior teeth loaded in MIP?

A

Axially

51
Q

What guidance occurs in excursive movements?

A

Canine/anterior guidance

52
Q

What teeth withstand majority of the load in MIP?

A

Posterior teeth, protecting the anterior teeth from high loads

53
Q

How do anterior teeth proctect the posterior teeth from off-axis loading?

A

The anterior teeth disclude the posterior teeth in excursive movements

54
Q

What teeth tolerate axial loading well?

A

Posterior teeth, so they protect anterior teeth which are not axially loaded in MIP

55
Q

What can anterior teeth tolerate?

A

Lateral forces in excursive movements (off-axial loading) since they are further away from the fulcrum and the loads are less

56
Q

What are occlusal schemes/philosophies in excursive movements?

A
  1. canine guidance - anterior guidance
  2. group function
  3. balanced occlusion
57
Q

What is the mandible guided by when it moves laterally?

A

The outer inclines of the mandibular buccal cusps sliding along the inner inclines of the buccal cusps of the maxillary posterior teeth

58
Q

What is the most desirable group function consist of?

A

The canines, premolars and MB cusp of the first molar

59
Q

The more posterior the contact, the _______ the force

A

Greater- closer to the source of power; the more destructive the forces

60
Q

What are the buccal cusps like on the WS?

A

Mandibular teeth guide along the inner inclines of the maxillary teeth, as far posteriorly as the first molar (MB cusp)

61
Q

Where are there no contacts?

A

On the NWS

62
Q

________ function is acceptable but not ideal

A

Group function

63
Q

When is group function the only option?

A

For patients who:
- have no anterior vertical overlap
e.g. anterior open bite
- very large anterior horizontal overlap
e.g. class II div I
- have a reverse overlap
e.g. class III

64
Q

What is balanced occlusion?

A

Simultaneous contacts on both sides (working and non working) during lateral excursive movements (working side contacts and balancing side contacts)

65
Q

When is there contact during balanced occlusion?

A

Contacts between the posterior and anterior teeth during protrusive movement

66
Q

What happens during balanced occlusion if the mandible moves to the right?

A

On the right side (WS): outer inclines of mandibular buccal cusps contact inner inclines of maxillary buccal cusps and at the same time
On the left side (NWS): inner inclines of mandibular buccal cusps contact inner inclines of maxillary lingual cusps

67
Q

What happens during balanced occlusion when in protrusion?

A

There are contacts between posterior and anterior teeth

68
Q

What happens to posterior teeth in balanced occlusion?

A

Mesial inclines of mandibular cusps occlude with distal inclines of maxillary cusps

69
Q

When is balanced occlsuion not acceptable/ideal?

A

For dentate patients because it promotes tooth wear

70
Q

What kind of contacts are destructive and must be avoided?

A

Non-working side contacts

71
Q

What kind of occlusion is an acceptable form for complete dentures?

A

Balanced occlusion

D1 Spring - Occlusion & Fixed Pros. (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions