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Fixed Prosth Final (Fall) > Endo Teeth IV > Flashcards

Endo Teeth IV Flashcards

1
Q

How do you determine the size gates you should use for GP removal for a post

A

Place over the X-ray use only slightly wider than the canal

Minimum size 3

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2
Q

The post should be trimmed from the _ side nott the _

A

(handle) or coronal side… apex

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3
Q

The post should be ~_mm from the occlusal surface of the tooth

A

1.5

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4
Q

What are your different cement options for a post

A
  • Fuji I (GI)
  • Fuji Plus (RMGI)
  • Multi-Link (Resin)
  • Flecks ZOP
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5
Q

What is the most conventionally used cement for a post

A

ZOP

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6
Q

Why are RMGIs not ideal for post placement

A

-Can undergo water expasnsion over time due to water absorption

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7
Q

What are the down sides of using resin cements for posts like multilink

A

time consuming and technically demanding

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8
Q

Describe the procedure for multilink

A

Rinse and dry the canal

  • Mix primers A and B (1:1)
  • Scrub primers into the canal
  • Excess material dried with paper points
  • Cement loaded on the post and seated
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9
Q

Why should multilink never by injected into the post space

A

avoid premature setting of the cement (This is because the self-cure cement starts to set when it contacts the primers

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10
Q

Can ZOP and GI be loaded into the canal? If so then with what?

A

Yes lentulo spiral

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11
Q

Amalgam and resin cores both exhibit low _ strength

A

tensile

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12
Q

(Amalagam/Resin) has a high coefficient of thermal expansion

A

resin

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13
Q

(Amalgam/resin) produces more predictable proximal contacts

A

amalgam

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14
Q

(Amalgam/resin) invovles fewer steps

A

amalgam

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15
Q

(Amalgam/resin) placement of material is faster and easier

A

resin

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16
Q

Fluorocore is a (self/light/dual) cure resin core matierial

A

dual

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17
Q

t/f Fluorocore is not suitable for an intrim restoration

A

t

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18
Q

(Amalgam/resin) can be prepped immediately after placement

A

resin

19
Q

(Amalgam/resin) better choice for a long term intrim

A

amalgam

20
Q

Fluorocore requires - min for total self cure

A

5-7 mins

21
Q

A prefab post and amalgam/resin core requires how many appointments

A

1

22
Q

Carbon fiber posts are (RL/RO) on X-ray

A

RL

23
Q

Custom cast post and core requires _ appointments

A

2

24
Q

Cast post and cores are being critizied for being associated with

A

vertical root fractures

25
Q

Best use of custom cast post and cores are

A

Anterior or PM teeth with little remaining tooth structure or when the canal is eliptial/flared

26
Q

What are the advantages and disadvantages of a custom cast post and core

A

Advantages

  • Post can fit better to a tapered canal
  • Core is integral to the post to better strength

Disadvantages

  • 2 appointments
  • Removal of tooth structure –>POI
  • Cost= greater
  • Clinical procedure is more demanding
27
Q

What is the purpose of the positive horizontal stop for the cast post and core

A

minimize wedging

28
Q

What is the purpose of the vertical wall in the prep for a cast post and core

A

anti-rotational feature

29
Q

What are the minimum dimensions for the tooth ferrule recieving a cast post and core

A
  1. 5 mm vertical height

1. 0 mm minimum thickness

30
Q

What to remove for the poronal portion of the toot recieving a cast post and core

A
  • Thin tooth material <1 mm
  • Undercut tooth structure
  • Residual caries
  • Endo temporary
  • Existing restorative material
31
Q

Cast post and core minimal diameter is

A

1 mm

32
Q

Issue with cast post and cores with too short radicular structure

A
  • No retention
  • Increased risk of root fracture
  • **Same as prefab post
33
Q

To avoid making undercuts in the canal walls with gates when removing GP you should

A

only touch the canal walls upon removal and not insertion

34
Q

Describe the method of fabricating a cast post and core directly

A
  • Pattern fabricated intraorally
  • Auto-polymerizing PMMA (GC pattern)
  • Single canal/ single tooth
  • Easy access
  • Contour of final restoration obvious
35
Q

Describe the indirect technique of cast post and core fabrication

A
  • Pattern made in lab
  • Impression (elastomeric)
  • Multiple canals/multpile teeth
  • Problematic access
  • Contour of final restoration is unusual and need to be considered in context of adjacent and opposing teeth
36
Q

For direct technique which is done first (post adaptation/core formation0

A

Post adaptation (after lubrication place GC pattern in canal then place the burn out post)

37
Q

What’s the working and setting time of GC pattern resin

A 
Working= 2-3 min 
Setting= 4 min
38
Q

Plastic burn out post should fit (tightly/loosely) in the canal

A

loosely

39
Q

What is placed in the canal for indirect fabrication of a cast post and core impression

A

wire reinforcement

40
Q

The wire reinforcement for the impression should fit tightly or loosely in the canal and why

A

loosely

41
Q

What metal is used to make the cast post and core

A

Silver-Palladium

42
Q

Each portion of the cast post and core is possished except the _ and why

A

Core –> crown retention

43
Q

Why should the cast post and core be made with the minimal expansion technique

A

So the post will fit

Fixed Prosth Final (Fall) (8 decks)

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