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NBDE 2 > PROSTH > Flashcards

PROSTH Flashcards

1
Q

The four types of elastomeric impression materials are

A

polysulfides
condensation silicones
addition silicones
polyethers.

Surface moisture is not good for elastomeric impression materials because the moisture decreases the accuracy of the impression.

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2
Q

No moisture in which impression material

A

polyether

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3
Q

Origin and insertion of Lateral Ptrerygoid muscle

A
  1. Superior Pterygoid
    O = Infratemporal aspect of sphenoid wing
    I = 60% neck of condyle 30% disc
  2. Inferior Pterygoid
    O = lateral wing of sphenoid
    I = Neck of condyle
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4
Q

Medial Pterygoid muscle origin insertion action

A

Origin: Medial surface of lateral pterygoid plate Insertion: Medial surface of the ramus
Action: Elevates the mandible

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5
Q

Temporalis muscle origin insertion action

A

Origin: Lateral surface of skull
Insertion: Coronoid process /Anterior border of ramus
ACTION: Anterior part elevates the mandible Posterior part retrudes mandible

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6
Q

Masseter muscle origin insertion action

A

Origin: Zygomatic arch
Insertion: Lateral surface of ramus/ Coronoid process
Action: Elevates the mandible

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7
Q

Muscles of Masstication (4)

A
  • Temporalis
  • Masseter
  • Lateral Pterygoid
  • Medial Pterygoid
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8
Q

Center of resistance –

A

half the distance from alveolar crest to root apex (translation)

*During rotation movements: center of rotation=center of resistance

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9
Q

Superior Lateral Pterygoid origin insertion action

A

Origin: Infratemporal aspect of the sphenoid wing

Insertion: - 60% of fibers attach to neck of condyle
- 30% attach to the disc

Action: - Works together with elevator muscles

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10
Q

Center of rotation:

A

Apical to center of resistance (apical to halfway down root) –during translation movements and tipping movements

  • During rotation movements: center of rotation=center of resistance
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11
Q

Lateral Pterygoid origin insertion action

A

Origin: Lateral wing of the sphenoid

Insertion: - Neck of the condyle

Action: - Unilateral contraction: mediotrusive movement of that condyle and lateral movement of the mandible to the opposite side.

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12
Q

There are five major sources of dimensional change:

A 
polymerization shrinkage, 
loss of a by-product, 
thermal contraction, 
imbibition (absorb H2O)
and 
incomplete recovery of deformation because of viscoelastic behavior.
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13
Q

what are the biological principles of tooth prep/ifxed

A
  • conservation ot tooth strx
  • preservation of gingival tissues
  • Marginal intergrity
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14
Q

WHat are the mechanical principle of tooth preps/fixed?

A
  • Rentension
  • Resistance
  • Structual durability
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15
Q

Which position is the most reproducible for restorative dentistry?

A

CR

CR = Tooth-independent ; det by condyles/ligament in condyles in the superior/anterior most position w/i the glenoid fossa

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16
Q

A porcelain-fused-to-metal (PFM) crown preparation requires which of the following margins?

A

chamfer margin on the lingual

1mm+ shoulder margin on the facial.

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17
Q

The force magnitud/duration during mastication is

A

very heavy, and the force duration is very short.

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18
Q

The force magnitude/duration during swallowing is

A

MOD force ; Short Duration

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19
Q

The force magnitude/duration during speaking is

A

Light Force ; Very short Duration

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20
Q

MOD Force ; Varible duration is the force magnitude/duration for?

A

Either habits or Orthodontics

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21
Q

Irreversible hydrocolloid aka _____ is a flexible impression material that is most commonly used to obtain study models. It is susceptible to ____2____ and ____3____, which leads to deformation and should be poured with stone as soon as possible.

A
  1. alginate
  2. imbibition (gain or loss of water)
  3. syneresis (quick drying)

Alginate sets up by calcium sulfate reacting with alginate to produce insoluble calcium alginate, which demonstrates a gel consistency.

22
Q

2 designs in tooth preparation can be used with all-ceramic crowns?

A

(Butt-joint) SHOULDER or CHAMFER

23
Q

A protrusive jaw relation record is made in order to set the

A- Horizontal condylar inclination of the articulator

B- Anterior guide table of the articulator

C- Lateral condylar guidance of the articulator

D- Lateral translation of the articulator

A

A

24
Q

Clicking of the dentures during speech most often indicates which of the following?

A- Inadequate denture retention

B- Decreases occlusal vertical dimension

C- Insufficient interocclusal space

D- Improper buccolingual position of the teeth

A

C

25
Q

Which of the following explains why proper contouring of the axial surface of complete cast restorations is extremely important?

A- Retention

B- Occlusal wear

C- Effect on gingival tissue health

D- Ability to provide caries resistance

A

C

26
Q

______________ is a flexible impression material that contains agar-agar as a primary component. It undergoes a physical reaction (from a sol-to-gel state).

A
  1. Reversible hydrocolloid

Reversible hydrocolloids require the use of specialized trays and water baths.

27
Q

Which of the following refers to a decreased occlusal vertical dimension?

A- Vertical dimension that leaves the teeth in a clenched, closed relation in normal position

B- Occluding vertical dimension that results in a excessive interocclusal clearance when the mandible is in rest position

C- Insufficient amount of interarch distance because of the bony ridges

D- Condition in which the patient cannot open mandible because of temporomandibular joint pathology

A

B

28
Q

Pressure on the midpalatine suture will improve

A- Denture retention only

B- Denture stability only

C- Both denture retention and denture stability

D- Neither denture retention nor denture stability

A

D - it’s a relief area

29
Q

A protrusive jaw relation record is made in order to set the

A- Horizontal condylar inclination of the articulator

B- Anterior guide table of the articulator

C- Lateral condylar guidance of the articulator

D- Lateral translation of the articulator

A

A

30
Q

Irreversible hydrocolloids contain two phases as follows:

First phase : 
Second phase :
A
  1. (soln): the material is a liquid or semiliquid.

2. (gel): the material is semisolid and is similar to a gelatin dessert.

31
Q

1

A

1

32
Q

1

A

1

33
Q

1

A

1

34
Q

1

A

1

35
Q

___1____rubber is an _____ impression material that undergoes a chemical change. It is relatively rigid with good tissue detail but is unstable in the presence of ______.

A
  1. Polyether
  2. elastomeric
  3. moisture
36
Q

1

A

11

37
Q

1

A

1

38
Q

1

A

1

39
Q

1

A

1

40
Q

1

A

1

41
Q

1

A

1

42
Q

____1____ rubber is an ___2____ impression material that undergoes a chemical change to produce a rigid and foul-smelling impression with good detail and _____3___.

A
  1. Polysulfide
  2. elastomeric
  3. dimensional stability
43
Q

1

A

1

44
Q

1

A

1

45
Q

1

A

1

46
Q

For procedures using the lathe, the following should be utilized:

A

Use fresh pumice each time.
Use disposable trays.
Use sterile (steam sterilize) or disposable rag wheels

47
Q

1

A

1

48
Q

1

A

1

49
Q

What can you expect to see in pt with Muscle dystrophy ?

A

lower face with open bite.

concern w/ LA: Increase risk of tox (lido)

50
Q

______1____ is an ____2____ silicone that is utilized to obtain precision impression for prosthodontic fabrication.

A
  1. Polyvinylsiloxane

2. addition

NBDE 2 (13 decks)

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