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SP14 Occlusion > Q7-Criteria for Optimal Functional Occlusion > Flashcards

Q7-Criteria for Optimal Functional Occlusion Flashcards

1
Q

This is the exact science of mandibular movement and resultant contacts; occlusion

A

gnathology

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2
Q

What was studied in 1925 dealing with keeping dentures in balance and simultaneous working and balancing contacts (group function)

A

balance occlusions (sears)

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3
Q

What was studied in the 1950s; like canine disclusion

A

unilateral eccentric contact

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4
Q

What two things are the criteria for optimal functional occlusion

A

joint position

tooth contacts

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5
Q

This is the most retruded position of the condyles and the ligamentous position

A

centric relation (early definition)

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6
Q

What ligament restricts centric relation

A

inner horizontal fibers of the temporomandibular ligament

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7
Q

True or False

centric relation is a reproducible (repeatable) position

A

True

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8
Q

In what application can centric relation be applied to

A

complete denture construction

fixed prosthodontics

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9
Q

Early studies suggested what in regards to muscles and CR

A

minimal muscle activity during function when condyles in CR position (most retruded)

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10
Q

The findings of muscle activity and CR led to what

A

many patients getting occlussal adjustments to make CO (MI) coincide with CR

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11
Q

True or False

The definition of CR has changed many times and remains controversial

A

True

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12
Q

Why is retruded not the proper location for CR

A

there are a lot of nerves and vessels in the retruded location

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13
Q

What is the direction on the articular eminences

A

downward and forward

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14
Q

CR is also the most what position

A

superior

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15
Q

What anatomical features can we work with to find the most stable orthopedic position

A

mandibular fossa
condyle
articular disc
muscles; elevators stabilize

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16
Q

The muscles of mastication pull on which way regarding TMJ

A

temporal; superior
masseter and medial pterygoid; supero-anteriorly
inferior pterygoid; anterior against posterior slope of the articular eminence

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17
Q

True or False

There is tooth influence in the postural (resting) position

A

False; there is no tooth influence

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18
Q

This stabilizes the condyles

A

muscle tonus

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19
Q

The most orthopedically stable joint position as directed by the muscles alone does what

A

locates the most superoanterior position

MS stable position

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20
Q

This position is the newest CR position

A

superoanterior; musculoskeletally stable position

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21
Q

The superior MS position is what

A

CR (Dawson)

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22
Q

This superoposterior (SP) MS position is what

A

CR (Boucher) most retruded position

ligamentous position

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23
Q

What is the definition of CR

A

the position of the mandible when the condyles are in their most superoanterior position in the articular fossae, resting against the posterior slopes of the articular fossa wit the discs properly interposed

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24
Q

It is not advisable to do what in regards to locate MS or new CR (SA position)

A

place posterior forces on the mandible

use Dawson technique

25
Q

True or False

The bone on eminence is thick so it can withstand forces

A

True

26
Q

These must contact in order to hold in this “muscle stabilized” position

A

interior lateral pterygoids

27
Q

The lowest EMG (Electromyography) activity is found in which positions

A

7-8mm at opening

2-4mm at rest (below ICP)

28
Q

Building ICP at the lowest EMG activity position would do what

A

put undue stress on joint, teeth, and support tissues

29
Q

During function, the elevator muscles, condyles, and posterior teeth do what

A

elevator muscles contract
condyles slide superiorly
posterior teeth occlude

30
Q

Once the muscles are relaxed, the jaw is greatly influenced by what

A

gravity and head position

31
Q

True or False

MS position is an optimal and reproducible position

A

True

32
Q

What is important to establish keeping in mind that the muscles of mastication can produce a larger force than needed during function

A

establish an occlusal condition that can accept heavy forces with minimal likelihood of damage and also be functionally efficient

33
Q

What are the optimal tooth contacts with 2 opposing molars on one side

A

40 lbs of functional force
joint position unstable
more load on fewer teeth (40lbs/tooth)
more load transferred to joint

34
Q

What are the optimal tooth contacts with 2 opposing molars on both sides

A

40 lbs of functional force
joint position more stable
load more evenly distributed (20lbs/tooth)
less load transferred to joint

35
Q

What are the optimal tooth contacts with 4 opposing molars on both sides

A

40 lbs of functional force
joint position even more stable
load more evenly distributed (10lbs/tooth)
less load transferred to joint

36
Q

What is the overall goal of optimal tooth contacts

A

even and simultaneous contact with as many teeth as possible
mandibular condyle in its most SA position
MS (CR) coincident ICP

37
Q

Forces on teeth are directed through what

A

periodontal ligament;

bone cannot accept pressure

38
Q

What does the periodontal ligament do with the forces

A

it transfers compressive forces on teeth to tensile forces on bone

39
Q

What type of forces are well tolerated

A

vertical forces; PDL acts like a sling, load is distributed to all fibers “shock absorber”

40
Q

Which type of forces are not well tolerated

A

horizontal forces

41
Q

What happens to the tooth upon horizontal forces

A

tooth tends to tilt; some PDL is tension and others in compression; not evenly distributed

42
Q

The process of directing occlusal forces through the long axis of the tooth

A

axial loading

43
Q

What is a method for axial loading

A

tooth contacts on either cusp tips or relatively flat surfaces that are oriented perpendicular to long axis of the tooth; crests of marginal ridges, bottoms of fossae

44
Q

This is the cusp contact opposing fossa by contact at 3 points surround the actual cusp tip

A

tripodization

45
Q

TMJ permits what type of movement

A

lateral and protrusive movements

46
Q

The lateral excursive movements allow what

A

horizontal forces to be applied to the teeth

47
Q

True or False

certain teeth can better accept these undesirable forces

A

True; anterior teeth cannot lateral forces

48
Q

What is an escape way for opposing cusps

A

grooves

49
Q

Where can you apply greater forces

A

posterior teeth

50
Q

Excessive forces can do what to the mandible

A

make the mandible shift downward and forward

51
Q

What other muscle groups aid in stabilizing the joint

A

inferior/superior lateral pterygoids

temporals

52
Q

What teeth are best suited for accept horizontal forces

A

canines

53
Q

Why are canines the best suited for accepting horizontal forces

A

long/large roots
large crown/root ratio
dense surrounding bone
fewer muscles are active when canines contact

54
Q

What is canine guidance or canine rise

A

maxillary and mandibular canines contact in laterotrusive excursions, disoccluding the posterior teeth

55
Q

What is a more favorable alternative to canine guidance

A

group function; several teeth contacting in laterotrusive

canines, premolars, MB cusp of 1st molar

56
Q

Why are more distal contact undesirable in group function

A

due to the greater forces than can be applied

57
Q

How can you protect the TMJ during laterotrusive movements

A

no mediotrusive (non-working) contacts

58
Q

What is anterior disclusion

A

during protrusive movement; no posterior contacts

59
Q

What are the 5 concepts of optimal functional occlusion

A

condyles in SA position
all tooth contacts in axial loading
adequate working contacts with no balancing contacts
anterior disclusion
posterior contacts heavier than anterior contacts

SP14 Occlusion (10 decks)

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