QUIZ 2 STUDY GUIDE- EHDA

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the function of the temperomandibular ligament

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prevents excessive retraction or backward moving of the mandible

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How to primary molar roots differ from permanent molars?

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They are shorter, smaller, narrower, and flare out.

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43 Terms

1
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the function of the temperomandibular ligament

prevents excessive retraction or backward moving of the mandible

2
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How to primary molar roots differ from permanent molars?

They are shorter, smaller, narrower, and flare out.

3
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If a tooth has not erupted within three months of its contralateral sister tooth...

Efforts to diagnose should be made

4
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What forms the TMJ?

An articulation between the temporal bone and the condyle of the mandible

5
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articular eminence of temporal bone

Raised portion of the temporal bone just anterior to the glenoid fossa.

<p>Raised portion of the temporal bone just anterior to the glenoid fossa.</p>
6
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articular fossa of temporal bone

also called glenoid fossa: is posterior to the articular eminence

<p>also called glenoid fossa: is posterior to the articular eminence</p>
7
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fibrous joint capsule

completely encloses the TMJ

8
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what do the fibers of the inferior portion of the capsule do

they connect the condyle of the mandible to the articular disc

9
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what does the upper portion of the fibrous capsule of the tmj do

it is looser and attaches the articular disc to the temporal bone

10
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where does the articular disc get its nourishment

the synovial fluid that the surrounding cells exctrete

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What is synovial fluid?

Lubricates and nourishes the cartilage covering the bones at movable joints

12
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what are the 3 ligaments associated with the TMJ

Temporomandibular, stylomandibular, and sphenomandibular

<p>Temporomandibular, stylomandibular, and sphenomandibular</p>
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Compared to the permanent teeth, how thick is the enamel on primary teeth?

0.5 mm

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How thick is the enamel on a permanent tooth?

1.00 mm or more

15
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True or false: primary teeth tend to erupt in pairs

True- a tooths contralateral sister should erupt along with or soon after

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Is a baby whose molar erupts before the incisor normal?

No. This is a highly abnormal situation

17
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Preservation of the primary teeth is important because

primary teeth act as space maintainers

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True or false: preservation of primary teeth isn't important because the teeth with be lost anyway

FALSE

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What is the TMJ innervated by?

mandibular division of trigeminal nerve (V)

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Where does the TMJ get its blood supply?

branches of external carotid artery

21
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Function of stylomandibular ligament

limits excessive protrusion of mandible

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the function of the sphenomandibular ligament

Suspends the mandible and limits excessive anterior motion

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what is important about the sphenomandibular ligament

it is used as a landmark for the administration of the inferioir alveolar block

24
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what are the two movements that the tmj performs

gliding and roation

25
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Rotational movement of TMJ

occurs mainly between the disc and the mandibular condyle in the lower synovial cavity

26
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gliding movement of TMJ

allows jaw to move forward and backward
occurs between disk and articular eminence in the upper synovial cavity

27
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what are the muscles of mastication involved in elevating the mandible during closing of the jaws

the bilateral contraction of the masseter, temporalis, and pterygoid muscles

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what does the contraction of one of the lateral pterygoids cause

the mandible to deviate to the contralateral side

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what is lateral excursion

side to side movement of the mandible

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masseter

closes jaw by elevating mandible AND protrudes the mandible

<p>closes jaw by elevating mandible AND protrudes the mandible</p>
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what is the function of the anterior and mid fibers of the temporalis

closes jaw and elevates mandible to help chew

<p>closes jaw and elevates mandible to help chew</p>
32
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medial ptyergoid muscle

closes jaw, lifts the mandible, helps protrude the mandible, and helps with side to side movement

<p>closes jaw, lifts the mandible, helps protrude the mandible, and helps with side to side movement</p>
33
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what is special about the lateral ptergoid

it is the only muscle of mastication that can elevate and depress the mandible

34
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anterior digastric muscle

opens the jaw

<p>opens the jaw</p>
35
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mylohyloid muscle

opens the jaw

<p>opens the jaw</p>
36
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lateral pterygoid muscle

protrudes the mandible, pulls the articular disk forward, and contributes to lateral (side to side) movement of mandible

<p>protrudes the mandible, pulls the articular disk forward, and contributes to lateral (side to side) movement of mandible</p>
37
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what is the function of the posterior fibers of the temporalis

retract the mandible

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when the jaw is at rest where is the condyle positioned

centered on its fossa (the teeth are not in occlusion)

39
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What is freeway space?

The space between your maxillary teeth and mandibular teeth when you are fully relaxed

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what is a nightguard designed for

to reestablish natural freeway space, which protects from grinding

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what is subluxation of the tmj

partial dislocation of a joint

<p>partial dislocation of a joint</p>
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is dislocation of the tmj a medical emergency

yes

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What is trismus?

LOCKJAW
inability to open the mouth due to a contraction/spasmsof the chewing muscles

<p>LOCKJAW<br>inability to open the mouth due to a contraction/spasmsof the chewing muscles</p>