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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
True or False | The bone on eminence is thick so it can withstand forces
True
26
These must contact in order to hold in this "muscle stabilized" position
interior lateral pterygoids
27
The lowest EMG (Electromyography) activity is found in which positions
7-8mm at opening | 2-4mm at rest (below ICP)
28
Building ICP at the lowest EMG activity position would do what
put undue stress on joint, teeth, and support tissues
29
During function, the elevator muscles, condyles, and posterior teeth do what
elevator muscles contract condyles slide superiorly posterior teeth occlude
30
Once the muscles are relaxed, the jaw is greatly influenced by what
gravity and head position
31
True or False | MS position is an optimal and reproducible position
True
32
What is important to establish keeping in mind that the muscles of mastication can produce a larger force than needed during function
establish an occlusal condition that can accept heavy forces with minimal likelihood of damage and also be functionally efficient
33
What are the optimal tooth contacts with 2 opposing molars on one side
40 lbs of functional force joint position unstable more load on fewer teeth (40lbs/tooth) more load transferred to joint
34
What are the optimal tooth contacts with 2 opposing molars on both sides
40 lbs of functional force joint position more stable load more evenly distributed (20lbs/tooth) less load transferred to joint
35
What are the optimal tooth contacts with 4 opposing molars on both sides
40 lbs of functional force joint position even more stable load more evenly distributed (10lbs/tooth) less load transferred to joint
36
What is the overall goal of optimal tooth contacts
even and simultaneous contact with as many teeth as possible mandibular condyle in its most SA position MS (CR) coincident ICP
37
Forces on teeth are directed through what
periodontal ligament; | bone cannot accept pressure
38
What does the periodontal ligament do with the forces
it transfers compressive forces on teeth to tensile forces on bone
39
What type of forces are well tolerated
vertical forces; PDL acts like a sling, load is distributed to all fibers "shock absorber"
40
Which type of forces are not well tolerated
horizontal forces
41
What happens to the tooth upon horizontal forces
tooth tends to tilt; some PDL is tension and others in compression; not evenly distributed
42
The process of directing occlusal forces through the long axis of the tooth
axial loading
43
What is a method for axial loading
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
This is the cusp contact opposing fossa by contact at 3 points surround the actual cusp tip
tripodization
45
TMJ permits what type of movement
lateral and protrusive movements
46
The lateral excursive movements allow what
horizontal forces to be applied to the teeth
47
True or False | certain teeth can better accept these undesirable forces
True; anterior teeth cannot lateral forces
48
What is an escape way for opposing cusps
grooves
49
Where can you apply greater forces
posterior teeth
50
Excessive forces can do what to the mandible
make the mandible shift downward and forward
51
What other muscle groups aid in stabilizing the joint
inferior/superior lateral pterygoids | temporals
52
What teeth are best suited for accept horizontal forces
canines
53
Why are canines the best suited for accepting horizontal forces
long/large roots large crown/root ratio dense surrounding bone fewer muscles are active when canines contact
54
What is canine guidance or canine rise
maxillary and mandibular canines contact in laterotrusive excursions, disoccluding the posterior teeth
55
What is a more favorable alternative to canine guidance
group function; several teeth contacting in laterotrusive | canines, premolars, MB cusp of 1st molar
56
Why are more distal contact undesirable in group function
due to the greater forces than can be applied
57
How can you protect the TMJ during laterotrusive movements
no mediotrusive (non-working) contacts
58
What is anterior disclusion
during protrusive movement; no posterior contacts
59
What are the 5 concepts of optimal functional occlusion
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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