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RD1 Lecture > Foundation Structures > Flashcards

Foundation Structures Flashcards

1
Q

3 planes of mand motion

A

Midsagittal- down midline

Transverse- horizontal, top to bottom

Coronal- frontal, front and back

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2
Q

TMJ moves in the

A

Transverse, horizontal plane

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3
Q

TMJ

A

Area where mand condyle articulates at the base of cranium w temporal bone squamous portion

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4
Q

Bones of skull

A

Temporal (zygomatic process)
Sphenoid
Zygomatic (cheek bone)
Mandible (condyle and coronoid processes)

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5
Q

What muscle inserts on the coronoid process? Condylar process?

A

Coronoid- temporalis

Condylar- lateral pterygoid

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6
Q

What forms the inferior part of the TMJ

A

Condylar process of the mandible

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7
Q

What does the rod through the typodont represent?

A

The transverse axis that the mandible rotates around

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8
Q

What forms the upper portion of the TMJ

A

Mandibular fossa of the temporal bone

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9
Q

Articulate eminence

A

Convex Area directly anterior to the mand fossa of the temporal bone

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10
Q

STF

A

Squamo- tympanic fissure

Posterior roof of mandibular fossa

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11
Q

Sphenoid bone

A

Middle portion of cranial base

Pterygoid process

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12
Q

Why is pterygoid process important

A

Of sphenoid bone

Important because it is the origin for 3 mastication muscles

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13
Q

Zygomatic bone

A

Cheek bone
Second most commonly fractured bone of face

Masseter origin

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14
Q

Where does the masseter originate

A

Zygomatic bone

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15
Q

What makes up the TMJ

A

Mandibular fossa of temporal bone
Articulate disc- dense fibrous CT
Condylar process of mandible

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16
Q

What moves with the head of the condyle

A

The articulate disc

17
Q

Functions of the articular disc of TMJ

A

Splits TMJ into functional compartments
Upper= translation
Lower= rotation

Stabilizes condyle, Helps lubricate TMJ

Absorbs shock

Reduces physical wear/strain

Regulates movement

18
Q

Functional compartments of TMJ

A

Upper= translation

Lower= rotation

Split by the articular disc

19
Q

TMJ fibrous capsule

A

Tube of tissues that encloses TMJ

Inner layer secretes synovial fluid
Outer layer is thick tissue that protects and limits movement

20
Q

4 muscles of mastication

A

Masseter
Temporalis
Medial pterygoid
Lateral pterygoid

21
Q

Masseter

A 
O= zygomatic arch
I= lateral angle of mandible

Function- elevates mandible

22
Q

Temporalis

A 
O= temporal fossa 
I= coronoid process of mandible and anterior Ramos

Function- anterior elevates mandible, posterior retrudes the mandible

23
Q

Medial pterygoid

A 
O= medial surface of lateral pterygoid plate of sphenoid 
I= medial angle of mandible

Function- elevates mandible

24
Q

Lateral pterygoid upper vs lower

A

Upper
O= great wing of sphenoid bone
I= articular disc and condyle
Function= opens mandible, pulls articular disc forward

Lower
O= lateral pterygoid plate of sphenoid
I= neck of condyle
Function- symmetrical= opening and protrusion
Asymmetrical= lateral movement of mandible

25
Q

Articular disc attachments

A

Posterior- retrodiscal tissue (bilaminar zone), loose ct that is highly innervated/vascular that attaches disc to tympanic plate and capsule

Anterior- lateral pterygoid

Medial- condyle and capsule

26
Q

What is the position of the articular disc determined by

A

Elastic fibers of the retrodiscal tissue bulling back

Vs

Lateral pterygoid pulling forward

27
Q

A contraction of the right lateral pterygoid results is what movement of the mandible

A

A left movement

28
Q

Mandible movement in each plane

A

Sagittal- symmetrical movement of mandible, muscles on both sides are working, opening and closing

Transverse- rotation
terminal hinge movement is when mouth is all the way open without mand moving forward, 25 mm

Translation- disc moves anteriorly to protrude mandible, about 10mm

Complex movement- movement of the mandible that combine rotation and translation

29
Q

Posselts diagram

A

Extreme mand motion record
Recorded in three planes and 3 points
Aka incisor, molar, and condylar

30
Q

Retruded contact

A

RC

Superior limit of terminal hinge movement

Aka centric relation or centric occlusion

31
Q

Stages of opening

A
  1. Pure rotational opening - rotational movement with condyles in terminal hinge position, without translation
  2. Rotation and translation- condyle is positioned down articular eminence, slightly protrudes
  3. Yawning- Extent of opening is limited by sphenomandibular ligament
32
Q

Anterior guidance

A

Occurs during protrusion when mandible moves and causes mand teeth to glide along lingual of max teeth, disoccluding posterior teeth

33
Q

Protrusive interference

A

Premature contact from MI to protrusive

Between mesial aspects of mand teeth and distal aspects of max teeth

34
Q

No slip from MI to RC?

A

Condyles are naturally in centric relation

Optimal condylar position

When MI = RC

RD1 Lecture (10 decks)

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