Flashcards in Midterm Questions from Drive 2 Deck (54)
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1
plane of occlusion
lines connecting cusp tips and incisal edges
2
arch length
distal 3M to distal 3M of each arch; MX > MD
3
which arch has greatest width?
MX > MD
4
supporting/centric cusps
MD buccal and MX lingual
5
guiding/non-centric cusps
MD lingual and MX buccal
6
each tooth occludes with 2 opposing teeth EXCEPT?
MD CIs and MX 3Ms
7
Mesial step relationship between MD and MX 1Ms?
*permanent MD 1M is mesial to MX 1Ms
*MB cusp of MX 1M is in the buccal groove of MD 1M
8
curve on monson
spherical curve of approximately 8" resting on buccal cusps of mandibular posterior teeth
9
MD vs MX posterior crown tilts?
*MD= lingual
*MX= buccal
10
skeletal components?
condyle and articular eminence
*condylar path determined by articular eminence
11
1) class 1
2) class 2
3) class 3
1) MX MB cusp in MD B groove
2) retruded mandible= MX MB cusp is mesial to MD B groove
3) protruded mandible= MX MB cusp distal to MD B groove
12
Class 2 division 1 vs division 2?
*1= MX incisors in normal position
*2= MX incisors retruded and inclined lingualy
13
working vs non-working side of mouth
*working= side that mandible moves towards
*non-working= side which mandible moves away from
14
Masseter A, O, and I?
A- elevates mandible
O- zygomatic arch
I- coronoid process and anterior border of ramus
15
temporalis A, O, and I?
A- elevates mandible
O- pterygoid fossa
I- coronoid process and anterior border of ramus
16
medial pterygoid A, O, and I?
A- elevates, protrudes, and mediotrusive (unilateral) mandible movement
O- pterygoid fossa
I- medial angle of mandible
17
lateral pterygoid Superior Head A, O, and I?
A-
O- greater wing
I- capsule and disc and neck of condyle
18
lateral pterygoid Inferior Head A, O, and I?
A- protrude (bilateral) and mediotrusive (unilateral)
O- lateral pterygoid plate
I- neck of condyle
19
Anterior belly of Digastric
A- depress/pull mandible back and elevates hyoid when mandible is stable(swallowing)
O- digastric fossa
I- middle tendon at hyoid
20
Posterior belly of Digastric
A- depress/pull mandible back and elevates hyoid when mandible is stable(swallowing)
O- mastoid notch
I- middle tendon at hyoid
21
motor unit with few or a lot of fibers? muscles examples?
motor unit= motor neuron and # of muscle fibers it innervates
*few= precise movement (lateral pterygoid)
*more fibers= gross function (masseter)
22
stretch/myotactic reflex? determines what?
causes contraction when a sudden forces stretches them
***determines muscle tonus
23
What is the computer board of brain? does what?
CNS= thalamus= controls and directs signals from cortex
24
primary pain
site and source of pain are the SAME
(heterotropic pain has different site and source)
25
TMJ innervated by? BS?
innervated by auriculotemporal nerve and BS is superficial temporal, middle meningeal artery, and maxillary artery
26
functional vs accessory ligaments examples
*functional= collateral, capsular, temporomandibular
*accessory= sphenomandibular, stylomendibular
27
articular disc attaches?
posteriorly to retrodiscal tissue and anteriorly to capsular ligament
28
what forms sling?
medial pterygoid forms sling with masseter laterally
29
denture bite force compared to normal?
1/4 of natural teeth
30
tongue thrusting
habit where tongue pushes excessively against incisors when swallowing, causes flaring of teeth
31
occlusal table
*occlusal surfaces of teeth
*between B and L cusp tips of posterior teeth
* ~50-60% of BL width of tooth
32
buccoocclusal (BO) line vs linguooclusal (LO) line vs central fossa (CF) line?
*BO= line through all buccalcusp tips of MD posterior teeth
*LO= line through all lingual cusp tips of MX posterior teeth
*CF= line though central grooves of MX and MD teeth
33
centric cusps contact?
the opposing central fossa line in central fossa areas
34
what do lingual and buccal embrasures do? which is better?
lingual> buccal
**guide food towards tongue
35
nociceptor, proprioceptors, interoceptors?
*nociceptor- pain
* proprioceptors- position and movement
* interoceptors- internal organ
36
muscle spindles do what?
monitor length within skeletal muscle
37
golgi tendon organ does what?
monitors muscle tension
38
pacinian corpuscle does what?
movement and firm pressure?
39
retrodiscal ligament does NOT?
stretch
40
isotonic vs isometric?
*isotonic= shortening under load
*isometric= contract without shortening
41
controlled relaxation vs eccentric contraction?
*controlled relaxation= lengthening with decreases motor unit stimulation
*eccentric contraction= lengthening while contracting simultaneously
42
central pattern generator (CPG)?
It's two phases?
higher centers in brain that control the activity of the specific muscle involved in chewing stroke
1) opening= mandible drops, then moves laterally
2) closing= crush and grind, buccal cusps of MX and MD are aligned then teeth guided to MI
43
central pattern control
breathe, walk, chew; brain stem
44
central excitatory effect
deep pain input to CNS, stimulates non-associated neurons
45
spinal tract recieves info from?
receives periodontal and pulpal afferent (from trigeminal nerve)
46
reticular formation influences?
on pain
47
describe the two reflex arches?
stimulus response
1) myotactic- causes contraction with stretched
2) nociceptive- protective; biting hard, causing mandible to drop quickly
48
reciprocal innervation controls?
antagonistic muscles
49
regulation of muscle activity?
gamma efferent system
50
secondary hyperalgesia?
increased tissues sensitivity without local cause
51
overjet vs overbite vs open bite?
*over-jet= horizontal
*over bite= vertical
*open bite= no contact
52
gliding contact
passing of cusp inclines
53
tall cusps and deep fossae = ____ chewing stroke?
vertical
54
