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Fixed Prosth 2 > Endo teeth > Flashcards

Endo teeth Flashcards

1
Q

The teeth become _____ and ____ susceptible to decay, fracture, and
breakdown.

A

softer; more

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2
Q

T/F: Once pulp has been removed, and nerve sensation stopped, the tooth loses its
ability to monitor changes in proprioception. Meaning you can bite harder
on these teeth before you feel pain or discomfort.

A

True

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3
Q

The tooth now is less strong and both of the above criteria result in a higher
likelihood of _______

A

FRACTURE

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4
Q

____ fracture
Fracture in enamel only (crack line) or fracture in
enamel and dentin
The fracture line does not extend apical to the
cemento-enamel junction
There is no associated periodontal probing defect
The pulp may be vital requiring only a crown
If pulp has irreversible pulpitis or necrosis, root
canal treatment is indicated before the crown is
placed

A

Favorable

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5
Q

____ fracture
Fracture in enamel and dentin
The fracture line may extend apical to the
cemento-enamel junction but there is no
associated periodontal probing defect
There is an osseous lesion of endodontic
origin

A

Questionable

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6
Q 
\_\_\_\_ fracture
Fracture line extends apical to the 
cementoenamel junction 
extending onto the root with an 
associated probing defect
A

Unfavorable

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7
Q

________ tooth fractures occur because:

  • Greater occlusal forces
  • Divided occlusal surface (Cusps and Fossa)
  • Fillings weaken tooth ability to hold together
A

Posterior

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8
Q

Crowns did NOT significantly improve the
success rates of endodontically treated
______teeth when ample tooth
structure remains.

A

ANTERIOR

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9
Q

Crowns significantly improved
success rates of endodontically
treated _______ teeth

A

POSTERIOR

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10
Q

Crowns are only indicated on RCT Treated ______ teeth when:
-They are structurally weakened by large or multiple restorations
-They need substantial changes in form or color that cannot be achieved
by more conservative means

A

ANTERIOR

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11
Q

Need at least __mm for a ferrule.

A

2 mm

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12
Q

If sufficient natural tooth structure remains, a _______ will
fill the RCT access and chamber to restore the lost tooth
structure.

A

Build up/Core

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13
Q

_______ has been as used a core material for a long time
but not as much now.
-Disadvantage – not retentive, does not bond, more tooth
reduction needed
-Advantage – strength

A

Amalgam

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14
Q

_______ are used much more now for core build up
-Disavantage – not as strong
-Advantage – usability, bonding, more conservative tooth
reduction

A

Composite resins

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15
Q

If tooth structure is missing, and restorability is
compromised but not condemned, a ___ can
be used to add strength to the core build up as
you restore the lost tooth structure.

A

post

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16
Q

Why do we use a ____?
-RCT teeth with inadequate tooth structure to retain a core
-Teeth that have lost more than 50% of coronal tooth structure
-Single rooted teeth since the anatomy of the pulp chamber
does not offer mechanical retention.
-Teeth with significant response to lateral forces of occlusion.

A

post

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17
Q

Teeth that have lost more than __% of coronal tooth structure need a post

A

50%

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18
Q

In these situations, post or no post?
-Preparation of a post space adds risk to the restorative
prognosis
-Higher likelihood of fracture or perforation
The needs for a post vary between anterior and posterior.

A

No post

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19
Q 
Post or no post?
Anterior Teeth –
Patient presents with an intact anterior moderate 
sized lingual RCT access with a resin composite 
restoration in the access
If tooth has darkened:
-Internal bleaching
-Possible veneer or composite
A

No opst

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20
Q 
In access hole, place 
bleaching material and seal 
the access with a temporary 
fill.
May need to be repeated 
several times.
Can last for a reasonable 
amount of time and may 
need to be touched up in 
the future.
A

Internal bleaching

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21
Q 
When more than \_\_\_% of coronal tooth 
structure has been lost -
A post and core will be necessary for 
retention of a crown.
The post and core is meant to resist 
lateral forces which would cause the 
crown to dislodge.
A

50%

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22
Q

A _____ is the vertical axial wall that encircles the

tooth which a crown will use to resist fracture

A

ferrule

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23
Q

Minimum ferrule =___mm beyond the core

A

2mm

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24
Q

T/F: Without the proper ferrule, root fracture is much more l
ikely on anterior teeth due to high lateral forces in
mastication.

A

True

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25
Q

When remaining tooth structure has large
access and a shorter clinical crown,
generally a post is or is not necessary?

A

No necessary

26
Q

If extensive coronal destruction exists, and a post is necessary to retain the core:
Use the _____ and _______ root and canal

A

longest and straightest

27
Q

Which canal should be used for a post in max molars?

A

Palatal

28
Q

Which canal should be used for a post in mand molars?

A

Distal root

29
Q

_____ tooth –
Significant variation in root length, curvature, bifurcation, and width.
Use a post only in roots that have ample bulk and a straight root anatomy.
Use a post on a premolar if:
Substantial tooth structure is missing (eg –post is placed in canal to replace lost cusp).
If the tooth is under substantial occlusal forces.
If the height of the tooth in MI is tall
Remember – a
2mm ferrule is
minimally required

A

Premolar tooth

30
Q

Which tooth is the exception to the premolar tooth assumption that would contraindicate a post?
Patient habits and conditions need to be
assessed to ensure occlusal forces are not
heavy or lateral.
It may be possible to avoid both a crown and
post on this tooth after RCT with a
conservative access fill.

A

1st mand pm

31
Q

____ teeth often only need a build up and then secondary retentive features such as grooves, boxes,
pins, bonding, or utilizing the access hole.

A

Molars teeth

32
Q

_____: ability of the post to resist vertical dislodging forces
Post length and taper
Active or Passive design
Cement used

A

Retention

33
Q 
\_\_\_\_\_\_" ability of the post and core to withstand lateral or rotational forces
Amount of remaining tooth structure
Post length and rigidity
Anti-rotation features
Presence of a Ferrule
A

Resistance:

34
Q

__-__ the length of the root is ideal

Minimum length at least that of the clinical crown

A

½ to 2/3

35
Q

__-__mm of Gutta Percha left at apex to keep the seal of the
Gutta Percha

A

4-5 mm

36
Q

A post too ____ allows the forces to act with greater

stress leading to a higher incidence of root fracture.

A

short

37
Q

A post that does not leave __-__mm at the
apical for the RCT seal will compromise
the tooth:
The post often is too big at the apex and can
cause root fracture.
The apical seal is compromised and
therefore, recurrent infection can occur.

A

4-5 mm

38
Q

As a general rule, molar post
spaces greater than __ mm apical to
canal orifice increases the potential
for root perforation.

A

7 mm

39
Q

Post preparation diameter should not exceed

___ of the root at the CEJ

A

1/3

40
Q

Leave at least __ mm of sound dentin at mid-root

A

1 mm

41
Q

Ideal diameter of post should only be ___-__mm depending on the particulars of the
tooth

A
  1. 6mm –

1. 2mm

42
Q

A ______ instrument melts the GP and then a warmed

plugger compacts the GP vertically.

A

heated

43
Q

Canal is instrumented with _____ or ______
rotary instrument.
-Pink GP should be visualized being removed during
the entire use of these instruments.
-This should be done SLOWLY
-Don’t cut on end

A

Gates Glidden or Peazo Reamer

44
Q

__-__ posts engage the surrounding root material

usually via threads or a serrated edge.

A

Active posts

45
Q

______ posts fit into the canal without engaging

the surrounding root material.

A

Passive posts

46
Q

______ posts are the most retentive
-Create higher stress on the root and
therefore have a higher incidence of
root fracture

A

Threaded Parallel

47
Q

_____ are close behind in
retentiveness.
-High stress at apex and therefore higher
incidence of root fracture

A

Serrated Parallel

48
Q

______ Posts are least retentive
-Less incidence of root fracture due to
least amount of stress on root
-Can be adequate.

A

Tapered Passive

49
Q

______ Post – Custom Post
-Resin pattern sent to lab to be cast in metal
alloy

A

Custom Passive

50
Q

_______ Posts – Cemented in root with

core build up of composite or amalgam

A

Pre-Fabricated

51
Q 
\_\_\_\_\_\_\_  Post
Advantages:
Anti-Rotational properties
Core is part of post
Can be preservative of tooth structure as 
the post fits the space
Disadvantages:
Multiple appointments needed
Tapered design is not as retentive
Dark un-esthetic core
Higher incidence of root fracture as post is 
harder material than root and if 
occlusion is off, post will not break, root 
will
A

Custom Cast

52
Q 
\_\_\_\_\_\_\_  Post
Advantages:
Increased retention within root
Ease of placement
More versatile to a wider range of tooth root shapes
Post will often break before root will
Disadvantages:
Post space needs to be slightly larger than cast
Core retention to post can be a problem
Possible rotation
Metal posts still have un-esthetic color
A

Pre-Fabricated

53
Q

_____ posts have difficulties
at times with narrowing of tooth root and can
lead to root tip fracture.

A

Parallel

54
Q 
A \_\_\_\_\_\_ tooth with a canal shape that is ovoid 
presents a dilemma.
A pre-fab post is not stable on its own as the 
canal shape allows the post to rock 
back and forth so:
-A cast post can be made
-A Pre-Fab post can used and 
cemented
-A Two Pre-Fab post technique can be 
used to stabilize the Pre-Fab Post
A

PM tooth

55
Q

_______ Technique
One major post goes to length and height for Core build
up, but canal orifice allows post to wobble.
A minor (smaller) post can be placed into the canal as far
down as it can go to stabilize the major post.
This reduces the stress on the major post which would have
been supported only by cement.
Then the two posts are cemented in the canal together
and core build up placed.
Primarily for Anterior and select premolars.

A

Two Post

56
Q

______ Technique
A red Duralay resin impression is made of the post space.
Tooth is temporized while Duralay is sent to the lab.
Post is tried in and cemented.
Cast post is used as build up as well.

A

Cast Post

57
Q

The post should extend to ______ so that

the build up has the full support of the post.

A

the height of your build up

58
Q 
Challenging occlusion?
Little occlusal room?
Significant vertical overlap?
Bruxer/Grinder?
If so, a \_\_\_\_ post is the first choice as it 
will not break or separate.  The risk is 
root fracture however if the forces 
on the tooth are still too strong.
A

Cast post

59
Q 
\_\_\_\_\_\_\_ Posts:
-Main advantage is better esthetics
-Modulus of Elasticity is similar to dentin
-Must use Resin cement (self-adhesive)
-Less Root fractures than metal posts
Post will usually break before post does
-Failures typically occur in teeth with little coronal 
tooth structure.
A

Fiber reinforced

60
Q

What types of cements are good to use in post situations?

A

Dual or self cure resin cements

Fixed Prosth 2 (12 decks)

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