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D117 > 3-1 tmd > Flashcards

3-1 tmd Flashcards

(52 cards)

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1
Q

Bony articular surfaces of TMJ

A

Superiorly: mandibular/glenoid fossa and articular tubercle/eminence of the temporal bone
Inferiorly: head of the condyle

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2
Q

tmj type of joint

A

ginglymoarthrodial joint

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3
Q

explain: TMJ is a synovial joint

A

it secretes fluid that serves as a lubricant

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4
Q

what separates the joint sapce into two compartments/joint spaces

A

articular disc

superior: gliding joint
inferior: hinge joint

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5
Q

what forms the gliding joint

A

articular eminence of the temporal bone and the superior surface of the articular disc

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6
Q

what forms the hinge joint

A

anterior surface of the condyle and the inferior surface of the articular disc

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7
Q

enumerate the 3 regions of the articular disc

A

Posterior band
intermediate zone
anterior band

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8
Q

thinnest portion of the articular disc which stays in contact w/ condyle when mandible moves

A

intermediate zone

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9
Q

what is the retrodiscal tissue

A

region of loose CT that is highly vascularized and innervated
tissue where articular disc is attached posteriorly
bordered by the superior retrodiscal lamina

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10
Q

differentiate inferior retrodiscal lamina from superior retrodiscal lamina

A

superior: contains many elastic fibers
inferior: chiefly collagenous fibers

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11
Q

define and purpose ligaments

A

elastic bands of tissues that support and confine the movement of the mandible
to protect muscles from being stretched beyond their capabilities

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12
Q

enumerate the ligaments of tmj

A 
capsular ligament/joint capsule
lateral ligament/temporomandibular ligament
collateral ligament
sphenomandibular ligament
stylomandibular ligament
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13
Q

describe capsular ligament/joint capsule

A

filled with synovial fluid
well-innervated
has proprioceptive functions (similar to periodontal ligaments)

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14
Q

describe lateral ligament/temporomandibular ligament

A

maintains the position of the condyle in the glenoid fossa by preventing lateral and posterior displacement of the mandible

consists of 2 fibers that run obliquely and transversely

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15
Q

which fiber limit the rotation of the condyles

A

oblique fibers of lateral ligament

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16
Q

constitutes the collateral ligament and their function

A

medial and lateral discal ligaments - stabilize the articular disc to the neck of the condyle

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17
Q

describe/attachment sphenomandibular ligament

A

connects spine of the sphenoid bone with the medial surface of the mandible

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18
Q

function of sphenomandibular ligament

A

gives some support to the mandible and may help limit maximum opening of the jaw

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19
Q

attachment of stylomandibular ligament

A

styloid process of temporal bone to posterior surface of the mandible (near the angle)

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20
Q

action of stylomandibular ligament

A

relaxed when mouth is closed but becomes tensed on extreme protrusion

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21
Q

Muscles of mastication

Study These Flashcards
A
  1. masseter
  2. Temporalis muscle (3 heads)
  3. medial/internal pterygoid muscle (2 heads)
  4. lateral/external pterygoid muscle (2 heads)
22
Q

forms the sling (mom)

Study These Flashcards
A

masseter and medial pterygoid muscle

23
Q

action of masseter

Study These Flashcards
A

elevation; secondarily aids in protrusion of md

24
Q

only muscle that can be palpated intraorally… and why

Study These Flashcards
A

temporalis muscle due to its connection to the coronoid process

25
stabilizes the condyle during mastication
superior lateral pterygoid muscle
26
one of the smalles muscle which aids in the protrusion, depression, and latero-medial movement of the mandible
inferior lateral pterygoid muscle
27
maximum opening of the mouth
50-60mm
28
during maximum opening what happens to the structures
retrodiscal tissue is stretched | articular disc is squeezed in between the articular eminence and the condyle
29
at centric relation, position of structures?
top of condyle is over the posterior band of the articular disc
30
types of TMD and differentiate
1. myogenous tmd - muscle generated pain | 2. Arthogenous tmd - jaw joint generated pain
31
inflammation of the disc
capsulitis/synovitis
32
symptoms of tmd
1. pain/discomfort 2. tmj noise 3. locking of jaw 4. limited opening of the mouth 5. deviating jaw movements 6. chewing difficulties 7. headache 8. abnormal jaw opening
33
Epidemiology of TMD
women 2x more than men 3:1 to 9:1 non-px population: 40-75% possible TMD 10% of the population older than 18y/o
34
characteristics of TMD
often remitting self-limiting fluctuate over time
35
t/f pain severity is the same across all age groups
true
36
t/f correlation between signs and symptoms of tmd is poor
true
37
annual incidence rate of tmd
2%
38
only __% of individuals are estimated to be in need of tx
3.6% to 7%
39
T/F occlusal disorders cause TMD
false
40
differentiate the different factors
predisposing factors - inc the risk of developing tmd initiating factors - causes the onset of tmd perpetuating factors - interferes w/ healing, enhances progression
41
give 2 initiating factors
direct trauma to the jaw/joint | microtrauma from abnormal habits
42
give 5 perpetuating factors
``` Autoimmune disease Systemic disease Connective tissue breakdown arthritis Thinning of cortical plates ```
43
other factors considered (in relation to malocclusion)
1. loss of molar support = malocclusion; no 2. change in VD = no recent studies 3. extensive overbite = no 4. extensive overjet = maybe/baka baliktad 5. CR-ICP slides (centric relation to intercuspal position)
44
differentiate screening from comprehensive evaluation
comprehensive eval - diagnosing px w/ symptoms | screening - diagnosing asymptomatic px
45
TMD management
1. appropriate diagnosis 2. most conservative and reversible therapy 3. relief of pain and dysfunction (First objective)
46
non-surgical treatment
1. self 2. orthotic therapy (occlusal orthotics) 3. stress management - relieve tmd symptoms 4. physical therapy 5. medications 6. occlusal adjusment
47
most prescribed management by dentists
1. meds | 2. splint therapy
48
prescribed to a patient with limited jaw movements. what does it do?
TheraBite - slowly increase the bite or mouth opening of px
49
what is a repositioning appliace
orthotic appliance with lingual ramp
50
reduces anxiety, insomnia and muscle hyperactivity
anxiolytics
51
types of medications
analgesics, Cox-2 inhibitors, muscle relaxtants etc
52
T/F occlusal adjustment is part of the initial management
false

D117 (2 decks)

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