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Occlusion 2 > Midterm > Flashcards

Midterm Flashcards

1
Q

What are the 3 major skeletal components?

A

MX, MN and temporal bone

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2
Q

What attaches to the coronoid notch?

A

Temporal muscles.

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3
Q

Which pole is thicker, medial pole or lateral pole?

A

Medial pole.

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4
Q

What shape is the MN condyle?

A

elliptic (prolate spheroid). Oriented horizontally.

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5
Q

In relation to the skin, where is the lateral pole located?

A

1-1.5 cm beneath the skin.

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6
Q

What are the ranges of dimension of each condyle?

A

18-25 mm mediolaterally.

5.5-16 mm anteroposteriorly.

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7
Q

Is flattening of the superior surface of the condyle or of the inferior aspect of the articular eminence considered degenerative joint disease?

A

No. It is a normal variation. The dif. shapes of the mn condyle are of no clinical significance.

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8
Q

What are the different shapes of the condyle and the most and least common?

A

Convex is 58%, flat is 25%, angled is 12% and round is 3%.

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9
Q

What makes up the temporal bone?

A

Concave glenoid (MN) fossa. Convex tubercle called the articular eminence.

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10
Q

Where does the MN Condyle articulate?

A

Base of the cranium with the squamous portion of the temporal bone.

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11
Q

What type of joint is the TMJ?

A

Ginglymoarthrodial joint.
Hinging: ginglymoid
Gliding: arthroidal

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12
Q

What are the determinants of MN movement?

A

The farther anterior a tooth is located, the less influence the TMJ and the greater the influence of the Anterior guidance.

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13
Q

Why is the TMJ considered a compound joint?

A

By definition a compound joint requires the presence of 3 bones. TMJ has 2 bones plus the articular disc, which is considered a non-ossified bone. It is made of dense fibrous CT

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14
Q

What are the soft tissue components of the TMJ?

A

Disc and attachments, disc position, joint compartments, ligaments.

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15
Q

What are the three zones of the disc and what are they based on?

A

Posterior border, intermediate zone, anterior border. Based on thickness. This is in the sagittal vies, the IZ is thinnest, (condyle should sit here), AB is thicker and PB is thickest.

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16
Q

What is the retrodiscal tissue made up of?

A

Highly vascularized and innervated loose CT.
Superior retrodiscal lamina: attaches posterior disc to tympanic plate.
Inferior retrodiscal lamina: Attaches the inferior border tof the posterior disc to the posterior condyle.

17
Q

What defines the boundaries of the TMJ?

A

Capsular ligament.

18
Q

superior retrodiscal tissue vs. interior retrodiscal tissue.

A

Superior is debated whether it is elastic or collagen. All agree inferior is collagenous.

19
Q

From the anterior view is the disc thicker medially or laterally?

A

Medially.

20
Q

What are the 4 histological zones of the disc?

A

Articular, proliferative, fibrocartilaginous, calcified cartilage, subarticular.

APFCS

21
Q

What is the most superficial layer? what are it’s qualities?

A

Articular layer. Adjacent to joint. Dense, fibrous CT. Less susceptible to effects of aging with greater ability to repair than hyaline cartilage.

22
Q

Can the TMJ repair and heal??

A

YES!! The fibrous CT is better than hyaline and is less likely to break down and more likely to repair.

23
Q

What is responsible for lubrication of the synovial joint?

A

Articular cartilage.

24
Q

What does the synovial fluid do?

A

Provides metabolic requirements. Prevents friction in the moving joint and is the primary mechanism of joint lubrication. Weeping lubrication eliminates friction in the compressed but not moving joint.

25
Q

Do ligaments stretch?

A

No. But they can be elongated from excessive force either suddenly or over a prolonged period of time. Passive restraints that limit or restrict border movements. Brakes.

26
Q

What happens when a ligament is compromised?

A

Joint function is altered.

27
Q

What are the 3 ligaments that support the TMJ

A

Collateral ligaments, capsular ligaments and Temporomandibular ligament.

28
Q

What are the 2 accessory ligaments?

A

Sphenomandibular and stylomandibular

29
Q

What do the collateral ligaments attach to?

A

Attach to medial and lateral poles. Keep disk on top.

Occlusion 2 (2 decks)

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