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40 Cards in this Set
- Front
- Back
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what is the formula for set gypsum cast
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CaSO4*2H20
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what happens if you use more than the recommended amt of water?
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longer setting time
weaker poor stacking less hard abrades more easily |
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how does dry strength compare to wet strength
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dry is 2x stronger than wet @ 1hr
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what are 3 accelerators
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2% KSO4
slurry water longer mix/vibration |
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what are 4 retarders
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blood
saliva alginate less mixing/vibration |
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what is another name for initial set
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loss of gloss
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how long is the initial set
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6-8min
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how long is the final set
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15-30
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how long do you need to wait to separate a cast
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30-60
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for solids & liquids, where is wetting better?
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high surface energy solids
low surface energy liquids |
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what are 3 causes of alginates poor dimensional stability
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water evaporation
imbibition syneresis |
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what is imbibition
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water absorption
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what is syneresis
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expulsion of liquid
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what is the distance of hinge opening
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~20mm
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which articulator has the condylar housing on the upper member and the condylar ball on the lower member
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arcon
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T/F: the use of an arbitrary facebow and fixed condylar width articulator is precise enough for most dx and tx
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T
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which muscle plays an active role in positioning the condyle for clenching when CO doesnt = MI
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lateral pterygoid
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which mandibular position can be easily replicated
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CR
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where are the condyles located in CR
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superior & anterior
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where are the muscles of mastication during CR
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physiologic rest positons
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what is the difference between deviation and deflection
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deviation is a shift of the jaw that disappears with continuous opening;
deflection is a shift to one side that becomes greater and doesnt disappear |
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what is a normal range of opening
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53-58mm
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what is a restricted mouth opening
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anything under 40
25 is very severe |
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what is a normal range of excursive movement
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> 8mm
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Masseter
O: I: F: |
superficial head
O: ant. 2/3 of zygomatic arch I: angle of mandible deep O: medial surface of zygomatic arch I: ramus of mandible F: elevation of mandible, retraction |
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Temporalis
O: I: F: |
O: temporal fossa
I: border of ramus, coronoid process F: elevation, retraction of mandible |
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medial pterygoid:
O: I: F: |
O: medial surface of lateral pterygoid plate, pyramidal process of palatine, maxillary tuberosity
I: posterior and inferior medial surface of ramus, angle of mandible F: elevate and protract mandible |
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lateral pterygoid:
O: I: F: |
O: greater wing of sphenoid, lateral pterygoid plate
I: anterior surface of neck of mandible, anterior margin of articular disc/capsule of TMJ F: protract and depress mandible |
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how does trigeminal neuralgia manifest
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sudden, unilateral, severe brief stabbing recurrent pain in one or more branches of CN V
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how does Eagle's syndrome manifest
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pain & dysphagia on chewing and turning head on affected side
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how do migraines manifest
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unilateral, severely debilitating, lasting 4-72 hrs
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how do tension headaches manifest
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mild to moderate, episodic, bilateral
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how to trigeminal autonomic cephalgias (TACs) manifest
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short, unilateral headache along w/ cranial autonomic symptoms on ipsilateral side
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how does Persistent Idiopathic Facial Pain (PIFP) manifest
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localized, present daily and throughout most or all of day
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how do you distinguish muscle and joint pain
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joint pain is constant, localized
muscle is intermittent, diffuse |
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how do you use the tongue blade test
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if pain increase is on opposite side from tongue blade, then its joint related
muscle pain increases when biting on painful side |
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what does phase I of MPD tx include (2-4 wks)
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explain problem
home therapy meds for pain, anxiety, sleep possible bite appliance |
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what does phase II of MPD tx include (4wks)
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reconsider diagnostics
check compliance continue home therapy/meds consider bite appliance |
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what does phase III of MPD tx include (4-6wks)
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continue home therapy/meds
reevaluate bite appliance initiate physical therapy |
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what does phase IV of MPD tx include
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reevaluate dx and compliance
determine need for consultation psychological counseling referral to pain center |
