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Occlusion > Midterm > Flashcards

Midterm Flashcards

1
Q

What innervates the TMJ?

A

Trigeminal>Mandibular>auriculotemporal, deep temporal, and masseteric

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2
Q

What vasculates the TMJ?

A

Post - Superficial temporal a.

Ant - middle meningeal a.

Inf - Internal maxillary a.

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3
Q

What is the capsule filled with?

A

Synovial fluid

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4
Q

What are the 2 types of synovial lubrication mechanisms?

A

Boundary - bathes surfaces

Weeping - absorbed into surfaces

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5
Q

Name the 5 zones of the condylar head from superficial to deep.

A 
Articular
Proliferative
Fibrocartilaginous
Calcified cartilage
Bone
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6
Q

The proteoglycan network in the ECM is made of what?

A

Hyaluronic acid
Monomers (Attached and detached)
Interstitial fluid
Collagen

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7
Q

The articular cartilage, what type is it?

A

Dense fibrous CT. NOT HYALINE

Nourished by weeping lubrication

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8
Q

The temporomandibular ligament has two parts. What are they?

A

Outer oblique - Limits rotation

Inner horizontal - Posterior movement

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9
Q

What are the other two small ligaments associated with the TMJ?

A

Sphenomandibular - inferior

Stylomandibular - protrusive

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10
Q

What are the 3 controlling mechanisms of occlusion?

A

Neuromuscular system
R and L TMJs
Contacts of teeth

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11
Q

What are the three phases of mastication?

A

Opening
Crushing
Grinding

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12
Q

Why is the TMJ considered a compound joint?

A

Usually means 3 bones, but we include the disc as non-ossified bone, making the TMJ a compound joint.

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13
Q

What is the diff b/t centric occlusion and centric relation?

A

Occlusion - Max intercuspation of teeth, tooth-determined position

Relation - condyles in their uppermost position in mand fossa. Jaw to jaw relation determined by the condyles in the fossa. INDEPENDENT OF TOOTH CONTACT.

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14
Q

Max opening?
Max lateral?
Max protrusive?
Max retrusion?

A

50-60 mm
10-12 mm
8-11 mm
1 mm

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15
Q

What is the Bennett movement?

A

Lat movement, the condyle appears to rotate with a slight lateral shift in direction of the movement.

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16
Q

What are the primary elevators of the mandible?

A

Masseter
Temporalis
Medial Pterygoid

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17
Q

What are the mandibular protruded mm.?

A

Inf. lat pterygoid
Med pterygoid
Masseter

18
Q

What is working movement?

What is non-working movement?

A

Laterotrusive movement

Mediotrusive movement

19
Q

What is the difference b/t functioning and non-functioning cusps?

A

Functioning - Support vertical dimension - Also called working cusps

Nonfunctioning - Guiding cusps. Maintain bonus of food on occlusal table. Minimize tissue impingement.

20
Q

What is eccentric relation?

A

Any position of the condyles and teeth when not in centric relation

21
Q

On the mandible, the buccal cusps are what type of cusps?

On the maxilla, the buccal cusps are what type of cusps?

A

Mandible - Functioning/working cusps

Maxilla - Non-Functioning

22
Q

Class I Occlusion is called?

A

Neutro-occlusion

23
Q

What characterizes the class I occlusion?

A

The mesiobuccal cusp of the mandibular first molar occluded in the embrasure area b/t the max second premolar and first molar.

Mesiobuccal cusp of max first molar is directly over the buccal groove of mandibular first molar.

MESIOLINGUAL CUSP OF MAX FIRST MOLAR IS IN CENTRAL FOSSA AREA OF THE MAND FIRST MOLAR.

24
Q

What characterizes a class II occlusion?

A

Disto-occlusion

Mesiobuccal cusp of mand first molar occluded in the C-F area of max first molar.

Distolingual cusp of max first molar occluded in the C-F area of the mand first molar.

25
Q

What characterizes class III occlusion?

A

Mesio-occlusion

Distobuccal cusp of mand first molar is situated in the embrasure b/t the max second premolar and first molar

Mesiolingual cusp of the max first molar is situated in the mesial pit of mand second molar.

26
Q

What is the BSS of Occlusion?

A

Bilateral
Simultaneous
Stable

These are “stops” that we want to see when teeth come together.

27
Q

What is overjet?

What is overbite?

A

Overjet - distance b/t labial incisal edge of max incisor and labial surface of the mand incisor in intercuspal position

Overbite - distance b/t the incisal edges of the opposing anterior teeth in intercuspal position

28
Q

What is the most powerful muscle in the body?

A

The lateral pterygoid

29
Q

What are exteroceptors?

A

Provided info from ext tissues of body to inform the CNS of environmental conditions

30
Q

What are nociceptors?

A

Provide info regarding discomfort and pain

31
Q

What are proprioceptros?

A

Provide information regarding position and movement of the mandible and associated oral structures.

32
Q

What are interoceptors?

A

Inform CNS of internal organs and processes.

33
Q

T/F - Ligaments actively participate in normal function of the TMJ.

A

FALSE. They act like guidewires. Ligaments do not stretch. They can become elongated, increasing in length, and this usually compromises normal joint function.

34
Q

What is hyperalgesia?

A

Increased sensitivity to painful stimuli.

35
Q

What is allodynia?

A

Pain produced by innocuous stimulation of normal skin or tissues.

36
Q

The sup head of the lat pterygoid m is most active when?

A

During clenching

37
Q

The inf head of the lat pterygoid is responsible for what?

A

T-lation of the mandibular condyle during opening

38
Q

What are three major functions of the masticatory system?

A

Speech, mastication, and swallowing

39
Q

Chewing strokes vary in intensity and directional movements according to which factors?

A

Gender
Food type
Stability of TMJ complex
Functional state of the masticatory muscles

40
Q

T/F - Neutral position of the teeth, where lingual and labial forces are in equilibrium, exists for both ant and post teeth.

A

TRUE

Occlusion (1 decks)

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