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

Endo Teeth III Flashcards

1
Q

When do you need a foundation for a crown

A 
>50% tooth structure is gone 
Esthetic improvement (i.e discolored tooth)
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2
Q

when do you need a post

A

inadequate remaining tooth structure to retain a core

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3
Q

T/F A post strengthens a tooth

A

f

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4
Q

What type of post should be done if 1/2 the clinical crown still remains

A

prefab

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5
Q

Advantages of prefab posts

A
  • Conserves tooth structure
  • Less time and cost
  • Less technically demanding
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6
Q

Contraindications of prefab post

A

-Eliptical or excessively flaired canals (post space prep requires excess removal of tooth structure)

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7
Q

What are the three metals that a prefab post can be made from

A

stainless steal
titanium
CoCr

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8
Q

Describe the properties of carbon fiber posts

A
  • Excellent biocompatibility
  • Satisfactory mechanical properties
  • Significantly weaker than stainless steal/resin core and cast metal
  • Less retentive than serrated SS posts
  • Inadequate radiopacity (disadvantage)
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9
Q

Features of fiber posts

A
  • Lower incidence of root fracture
  • Root fracture that do happpen typically restorable
  • Post fails before tooth fails
  • However* Long term data for these are lacking thus not as highly recommended for use as SS
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10
Q

Describe zirconia posts

A
  • Stiff and strong (no plastic behavior)
  • Esthetically better than metal
  • Zirconia and metal posts produced catastrophic fractures of the teeth compared to fiber reinforce posts
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11
Q

what posts are the most retentive and least retentive

A

threaded… tapered

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12
Q

Rank the posts in order of retentivness

A

Threaded> Parallel serrated > Parallel serrated tapered > Parallel smooth > Tapered

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13
Q

What posts are the worst stress producers

A

tapered threaded posts **threaded posts are NOT recommended

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14
Q

What posts generate the lease cementation stress

A

tapered

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15
Q

What types of teeth may you consider a tapered post for

A

one with thin walls

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16
Q

Why aren’t parallel posts good for flared/eliptical canals

A

-only touch the tooth at the apical end thus post retention is primarily dependent on cement

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17
Q

It was originally thought that threaded posts should be used for teeth with short roots with adequate root thickness where other posts would not be retnetive enough however what is the recommended thearpy instead of this

A

replace the tooth with an implant if the root is too short

18
Q

Greater post length –> (greater/lesser) retention

A

greater

19
Q

What are the limitations for increasing the post length

A
  • Increased risk of perforation

- Compromise the apical seal

20
Q

What is the min. length of the post required

A

equal to the length of the clinical crown

21
Q

What is the optimal post legnth

A

-No absolute guidelines but also long as possible without jeopardizing the apical seal and strength/integrity of remaining root

22
Q

What are the disadvantages of short post

A
  • Increases stress (root fracture)

- Low retention –> dislodgement

23
Q

If you have a short post you make be fine as long as you have significant_

A

ferrule

24
Q

The potential for perforation increases the the post is prepped more than _ mm from the canal oriface of a molar due to_ (What)

A

7 mm …. presence of root concavities

25
Q

Primary canal for maxillary and mandibular moalrs for a post

A

Mandibular-distal

Maxillary= palatal

26
Q

Increase in post diameter (increases/decreases) retention

A

neither

27
Q

Diameter of a post should not exceed more than

A

1/3rd the cross sectional root diameter at its apex

28
Q

Greater the post diameter the (greater/less) the risk of root fracture

A

greater

29
Q

At its max length the pos space is how thick in diameter

A

1/3rd the diameter of the apex

30
Q

Maxillary first molars have concavities where

A
  • **Furcal surface of the mesial buccal roots
  • Distal buccal roots
  • Least commonly seen on the palatal root
31
Q

Mandibular molars have concavities present where

A

-100% mesial root and 99% disral root

32
Q

The root should have _ mm of root circumferentially around the post

A

1mm

33
Q

What root should be used to place a post in premolars

A

-Longest and straightest (typically the palatal)

34
Q

Where is the furcation groove located on a maxillary first PM

A

buccal root on the palatal side

35
Q

What is the most commonly used parapost size .

A

4

36
Q

IS there any difference in prognisis if a post is placed immediately after endo treatment or if it is delayed

A

inconclussive results doesn’t matter (no correlation)

37
Q

Is there any difference in leakage between removing GP with rotary instruments and with warm instruments

A

no

38
Q

What size gates shouldn’t be used to remove gp and why

A

1 and 2 they are too thin and fracture in the canal

39
Q

Safe instrument size range for parapost preparaiton is between

A

0.6-1.2 mm

40
Q

What surfaces of the M and D roots of mandibular molars are generally thinnest and have concavities

A
  • Mesial root= distal aspect

- Distal root= mesial aspect

41
Q

Most roots are narrower…

A

MD than FL

42
Q

Enlargement of the canal space for the post rarely exceeds beyond

A

1 or 2 additional file sizes beyond the largest size used for endo treatment

Fixed Prosth Final (Fall) (8 decks)

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