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FP > Fixed Prosthodontics Concepts > Flashcards

Fixed Prosthodontics Concepts Flashcards

1
Q

What has better resistance form, a taller and narrower prep or a shorter and wider prep

A

Taller and narrower preparation has better resistance form

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2
Q

It is more likely and common for a __ crown to come decemented rather than an __

A

posterior
anterior

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3
Q

A fixed prosthodontics restoration that is fabricated outside the patients mouth and its meant to be cemented

A

Indirect restoration

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4
Q

With an indirect restoration, the tooth is prepared for the restoration and then a

A

final impression is made (To make a master cast to send to the lab)

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5
Q

What are 5 common indirect restorations

A

Inlays
Onlays
Crowns
Bridges
veneers

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6
Q

Any dental prosthesis that is luted, screwed or mechanically attached or otherwise securely retained to natural teeth, tooth roots and or dental implant abutments that furnish the primary support for the dental prosthesis

A

Fixed dental prosthesis (FDP)

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7
Q

Structure that directly receives thrust or pressure; an anchorage

A

Abutment

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8
Q

The part of a fixed dental prosthesis that unites the abutment to the remainder of the restoration

A

Retainer

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9
Q

An artificial tooth on a FDP that replaces a missing natural tooth, restores its function, and usually fills the space previously occupied by the clinical crown

A

Pontic

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10
Q

In FDPs, the portion of a FDP that unites the retainer and pontics

A

connector

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11
Q

The weaker the material for an FDP the larger the

A

connectors

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12
Q

The skeletal portion of prosthesis around which and to which are attached the remaining portions of the prosthesis to produce a finished restoration

A

Framework

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13
Q

The specific direction in which a prosthesis is placed on the abutment teeth

A

Path of placement / path of insertion / path of withdrawal

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14
Q

Path of placement of FDP abutments must be __

A

parallel to each other

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15
Q

A visual survey of the path of placement is done how

A

center of occlusal/incisal surface of prep is viewed with one eye (the other one closed)

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16
Q

Doing a visual survey ensures that the prep is neither

A

undercut or overtapered

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17
Q

Indirect vision for FDPs (3 things)

A

Firm finger rest
Maneuver mirror until one prep is centered
Move mirror without changing angulation until the next abutment is centered

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18
Q

What is a useful tool for evaluating an FDP path of insertion

A

making a diagnostic cast

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19
Q

Path of placement for posterior teeth

A

It is usually perpendicular to the occlusal plane to avoid getting “locked out”

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20
Q

Path of placement for anterior teeth

A

Usually flared to the facial, following the long axis of the tooth

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21
Q

What is the die hardener

A

Very thin layer (3-5 um) of material that is applied to the die to harden it. It reduces the risk of abrading/braking the stone (like the finish line)

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22
Q

The die hardener is applied before the

A

die spacer

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23
Q

What is the Die spacer

A

Thin layer (25-50 um) of material that is applied to the die to create a space for the cement when cementing the crown
(there are different brands with different thicknesses)

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24
Q

Die spacer should be placed on the prep, stopping __ away from the finish line

A

1 mm

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25
Q

Die spacer is applied after the __

A

die hardener

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26
Q

By not applying the die spacer 1 mm within the margin will allow the following 3 things

A
  1. Utilize this area as a stop when cementing the crown, guarantee space for the cement
  2. Orient the crown not only on the occluso-apical axis but on the mesio-distal and bucco-lingual axis
  3. Nice tight marginal seal, since there was never a spacer intended to be there
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27
Q

This is very useful when seating crowns if the crown is not seating appropriately

A

Occlude

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28
Q

What is occlude

A

an aerosol spray for disclosing high spots and contact points (Dries instantaneously; adheres to dry or moist surfaces)

29
Q

The most gingival point of curvature along the free gingival margin of a tooth

A

Gingival zenith (gingival trigone)

30
Q

Why is gingival zenith important

A

You want your restoration to have a gingival zenith that matches the contralateral tooth’s so achieve better esthetics

31
Q

Where is the gingival zenith usually ? With the exception of?

A

Usually lies distal to the center of the tooth, with the exception of the lateral incisor which is in the midline

32
Q

Thin gingival biotype

A

Thin:
Narrower bad of keratinized tissue which may end in a wavy mucogingival junction
periodontal probe is possible to be seen through the gingival while probing

33
Q

Thick gingival biotype

A

Thick:
Wide band of keratinized tissue
Thick gingiva
Short papilla
Squarish teeth
From the occlusal view, the alveolar housing of the teeth is broad

34
Q

Which gingival biotype has a thinner and thicker buccal plate

A

Thinner buccal plate = thin biotype
Thicker buccal plate = thick biotype

35
Q

The combined width of connective tissue and junctional epithelial attachment formed adjacent to a tooth and superior to the crestal bone

A

Biologic width

36
Q

What is the preferred biologic width

37
Q

Finish lines are always found on

A

dental structure

38
Q

When preparing a tooth for ANY kind of restoration its important to place the finish line on

A

sound dental structure

39
Q

If you don’t place the finish line on sound dental structure the restoration has a

A

higher risk of failure (basically it would have multiple margins, so theres multiple places where the restoration can fail)

40
Q

When should you consider crown fluting

A

When a multi-rooted tooth has had bone loss/super-erupted needs to be evaluated for its periodontal prognosis, specifically on its furcation

41
Q

What is crown fluting

A

When doing a crown, the crown anatomy needs to be modified to allow cleans-ability. A slot needs to be incorporated on the crowns surface coronal to the furcation

42
Q

What type of margin is recommended when doing crown fluting

A

feather-edge or a light chamfer margin (to conserve as much dental structure as possible)

43
Q

All internal line angles should be

44
Q

What are 2 reasons we round internal line angles

A
  1. reduce stress on the remaining tooth structure (prep)
  2. Less chance of that edge to brake or wear down during the fabrication of the master cast/crown. This might not let the crown seat completely due to an interference
45
Q

Crown gauge / caliper

A

used to measure the thickness of a crown on a particular area (very useful when adjusting a crown/framework were limited space is available)

46
Q

Absolute minimum thickness of a PFM - metal coping

A

> /= 0.3mm (0.5mm ideal)

47
Q

Absolute minimum thickness of occlusal surface of a FMC

48
Q

Absolute minimum thickness of PFM - coping and porcelain

A

> /= 1.5 mm

49
Q

No more than __ of a layer of porcelain should be applied on a FDP

50
Q

You can ask the lab to create the interproximal contacts __ to assure good porcelain support

51
Q

You want to extend the design of the framework so it

A

supports the porcelain in a better way to prevent fracture

52
Q

__ of the porcelain will increase the risk of fracture

53
Q

A band or ring used to encompass the root or crown of a tooth

A

Ferrule effect

54
Q

Provides a bracing or casing effect to protect the integrity of the root

A

The ferrule

55
Q

Ferrule height is measured from the __ to the __

A

build up core
crown margin

56
Q

Ideally, a ferrule effect of __ is wanted to minimize the risk of fracture.

57
Q

If the height of a ferrule effect is not met can we put a post in

A

A post is NOT contraindicated if that height is not met but compromises it prognosis

58
Q

We are looking to create a __ to obtain occlusal stability while mounting casts for crown fabrication

A

tripod effect

59
Q

Use registration material where

A

ONLY on the teeth you are restoring (already have the other “legs” to your stool)

60
Q

A fixed dental prosthesis that is luted to tooth structures, primarily enamel, which has been etched to provide mechanical retention for the resin cement.

A

Resin bonded prosthesis (maryland bridge)

61
Q

What are 5 indications for a resin-bonded prosthesis

A
  1. Where abutment teeth are minimally or unrestored, with sufficient enamel present for adhesion
  2. Patients unwilling or unsuitable for surgical treatment including implants, bone augmentation
  3. Fixed retention after orthodontic treatment
  4. Splinting periodontally compromised teeth to improve comfort
  5. Needle-phobic patients
62
Q

What are 5 contraindications for a resin-bonded prosthesis

A
  1. heavily restored abutment teeth with reduced enamel for adhesion
  2. Small abutment teeth
  3. Mal-aligned abutment teeth
  4. Significant differential mobility of abutment teeth where more than one abutment is incorporated in the design, as this frequently leads to de-bond
  5. Allergy to base metal alloys (nickel)
63
Q

What is the most common complication with a resin bonded prosthesis

A

De-bonding (loss or retention)

64
Q

What are 4 other common complications with a resin-bonded prosthesis

A

Material complications: framework and veneer fractures
dental caries
recurrent peridontitis
poor esthetics

65
Q

The complete intercuspation of the opposing teeth independent of condylar position

A

Maximal intercuspal position

66
Q

THe occlusion of opposing teeth when the mandible in in centric relation

A

Centric occlusion (may or may not coincide with MIP)

67
Q

The relationship in which the condyles articulate in the most anterior-superior position

A

Centric relation

68
Q

Centric relation is independent of

A

tooth contact

69
Q

CR positon =
Not TMJ related =

FP (10 decks)

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