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FPD > Midterm Questions > Flashcards

Midterm Questions Flashcards

1
Q

The most important bond in PFM crown is?

A

Chemical

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2
Q

Metal alloys used for PFM restorations have this important characteristic

A

A fusion temperature higher than all of the porcelains that are fired onto the framework

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3
Q

What metal does not participate in the formation of the oxide layer of a PFM crown?

A
  • Copper

Participate in the formation of the oxide layer of a PFM crown

  • Tin
  • Indium
  • Iron
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4
Q

The glassy phase of porcelains is derived from?

A

Feldspar

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5
Q

When fabricating a custom tray how far would the borders be extended?

A
  • 3-5mm cervical from the prepared margin
    • Depth of the vestibule has nothing to do with it
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6
Q

When fabricating a custom tray, which of the following are correct with tissue stops?

A
  • Should be preplaced on unprepared teeth
  • Divergent locations to for a stable triad
  • Cutting squares 4x4mm apart
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7
Q

Which is indicated for Treatment Planning a crown with subgingival margins?

A

Abutment has 0.5 ferrule effect (want to extend to make larger ferrule)

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8
Q

Which are characteristics of small chamfer margin preparation?

A
  • Fairly conservatice
  • Burnishable
  • Detectable visually & tactile

Not a characteristic - Easy to Prepare

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9
Q

By increasing the connectors height from 2mm to 4mm the flexure of resistance will increase by how many times?

A
  • Doubling the height of connector will not double the resistance but it does increase exponentially?
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10
Q

What kind of shape should a connector have when fabricating PFM fixed dental prosthesis from 12-14?

A

Triangular

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11
Q

When designing a FDP in anterior, where should the connector be placed?

A

Incisal 1/3rd

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12
Q

All ceramic FDP connectors should have an area of?

A

16sq mm

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13
Q

Which are examples of non-ridgid connectors?

A
  • Mortise & Tennon
  • Split Pontic
  • Sub-occlusal
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14
Q

What type of prosthesis if the following?

A

Ancillary Prosthesis - made to do a function

  • Made for pts that need radiation
  • Alloy blocks and prevents rx
  • Mouth is open
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15
Q

What are Fixed Prosthodontic’s main goals?

A
  • Restore function and mastication
  • Restore esthetics
  • Retain helath & integrity of arches
  • Sipport the tx of problems related to TMJ
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16
Q

When a full coverage Indirect Resotration becomes part of an FPD it changes name from corwn to?

A

Retainer

17
Q

Proper proximal contact for a crown or FDP on a working cast is confirmed by?

A

Visual examination of proximal contact area is sufficient

18
Q

All of the following statements are true concerning the intraoral evaluation of a crown except?

A

Flossing the proximal contact should fray

19
Q

According to Dr. Sebert’s Ridge Classification, which type which is least prevalent in the general population?

A

Class II

20
Q

Which pontic has no contact with the gingiva?

A

Hygiene Pontic

21
Q

This tx is not extremely technique sensitive and should be considered a routine procedure by average general dentist?

A

Ridge Preservation

22
Q

Which 2 Sebert Ridge Classifications share loss of ridge horizontal height (width)?

A

Class I and III

23
Q

How much axial wall thickness is required, minimal for ferrule effect?

A

1mm

24
Q

What are the Guidelines of the Post and COre?

A
  • A post that is too short will increase the likelyhood of root fracture
  • The post length should be 2/3 of the length of the root and have the length of the root in bone
  • It should be 3-5mm from the apex, can not be less, to insure that we keep the canal sealed
  • The purpose of the post is to retain the core
  • THe purpose of the core is to provide retention & resistance of the crown
    *
25
Q

Post retention is influenced by which elements?

A
  • Post length
  • Post diameter
  • Post surface texture
26
Q

Most coronal tooth structure is missing on anterior tooth, which post and core is indicated?

A

Cast post and core

27
Q

A tooth that was prepared for a PFM crown, how much reduction should be done on the occlusal surface? (no metal on occlusal surface)

A

2mm

28
Q

Which cusps do you bevel on a mandibular posterior tooth?

A

Buccal cusps

29
Q

What are characteristic of metalic occlusion when doing a PFM?

A
  • More conservative preparation
  • Stronger occlusal surface
  • Should be disccued with pt do to esthetics
30
Q

Which are correct in reguards to cord impregnated with Epinephrine?

A
  • Cord impregnated with epinephrine will provide vasoconstriction and hemostatsis
  • However epinephrine sx can occur raising BP
31
Q

Displacement of gingival tissue may happen when?

A
  • Placing a crown
  • Cavity prep extending subgingivally
  • Taking an impression to get contour below cervical margin
  • Gingival overgrowth hindering operative procedure
  • Control gingival hemorrhage during operative procedure

Wrong - quadrant scaling to control hemorrhage

32
Q

Retraction cord saturated with chemicals are recommended to be place no more than?

A

20 mins

33
Q

Which are methods of gingival displacement?

A
  • Phyical/mechanical
  • Chemical/mechanical
  • Laser
  • ElectroSurgical
  • Surgical
34
Q

What is the primary reason for tx of a FDP?

A

To give pts their best chance of preserving their remaining natural dentition

35
Q

In the case of a vital tooth that is tp for a crown that is extensively damaged, pulp exposre, questionable pulpal health, should have what tx?

A

Endo

36
Q

All of the following are listed as advantages of a RPD compared to FDP?

A
  • Replacing tissues and structures other than teeth
  • Easier to clean if the pt has limited motion skills
  • Usually more economical for a given number of teeth replaced
  • Allows for possibility of diastema (need connector in FDP)
37
Q

When trimming the die stone to fabricate a master cast?

A

it has to be 6mm

38
Q

Working dies for indirect restorations constructed by dentist prior to crown and bridge manufacturing should have all of the following?

A
  • Properly trimmed dies, allowing access to cavosurface margin
  • Stable/removable dies
  • Accurate oral anatomy
  • Made of jade stone

FPD (3 decks)

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