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Endotontics > Restoration of Endodontically Treated Teeth > Flashcards

Restoration of Endodontically Treated Teeth Flashcards

(52 cards)

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1
Q

loss of moisture leads to

A

increased tooth fragility

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2
Q

sodium hypochlorite and chelator used in canal irrigation effect

A

interact with root dentin –> leading to dentin erosion and softening

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3
Q

less than 50% of tooth structure? anterior and posteiror?

A

anteiror - restore

psoterior - crown and maybe a post

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4
Q

where do you put post?

A

larger and straighter canals

pre-molar or molar - bigger

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5
Q

upper molar post location

A

palatal canal

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6
Q

lower molar post locaiton

A

distal canal

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7
Q

conservative endo access affects tooth stiffness by?

A

5%

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8
Q

endo access combined with an MOD prep results in?

A

max tooth fragility

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9
Q

3 reasons why we are restoring endodontically treated teeth

A
  1. protect the remianing tooth from fracture
  2. prevent reinfection of the root canal system
  3. replace the missing tooth structure
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10
Q

primary considerations beforeRCT?

A
  1. restorable?
  2. periodontally sound?
  3. strategic and functional?
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11
Q

what to restore it with? dictated by?

A

dictated by the amount of tooth that is left
1. direct composite restoration

  1. indirect restorations (composite or onlays)
  2. full crowns
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12
Q

how to evaluate? need what?

A

2 periapicla radiographs

1 bitewing radiograph

perio probe needed

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13
Q

major differences between endo treated teeth and vital teeth

A
  1. loss of tooth structure
  2. altered physical properties
  3. altered esthetics

loss of moisture and coloration

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14
Q

how much less fluid in RCT treated teeth

A

3-7% less

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15
Q

describe structural integrity in relation to RCT teeth

A

endodontic tx. requires removal of tooth structure (pulpal roof) which destroys the ‘boxed beam’ and weakend the basic structural integrity of the tooth

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16
Q

boxed beamcreates?

A

superior strength and rigidity

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17
Q

access cavity importance?

A

YES – one of the most important aspects

- unique structure and the bigger is not always better

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18
Q

aim in restoring these teeth?

A
  1. protect
  2. prevent
  3. replace
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19
Q

main functions of anterior teeth

A
  1. protect posteiror teeth from lateral forces
  2. esthetic considerations
  3. minimal restorative procedure
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20
Q

implication for crown

A

more than 50% of tooth gone

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21
Q

characteristics of posterior teeth

Study These Flashcards
A
  1. carry occlusal load
  2. ‘always’ considers crowns
  3. posts/ cores depends on remaining tooth structure
22
Q

1 cause of failure following successful RCT

Study These Flashcards
A

CORONAL LEAKAGE

23
Q

when to restore the RCT

Study These Flashcards
A

as soon as possible

4-6 weeks

24
Q

describe / explain situation with coronal leakage

timeline?

Study These Flashcards
A

all restorations are less than perfect
- essentially remporaries (they leak)

  • when saliva leaks into the gutta percha ‘seal’ contamination occurs rapidly

somewhere between 1 day and 4 weeks following exposure to saliva, contamination extends to the peri-apical tissues and retreatment becomes necessary

25
#2 cause of RCT therapy
crown and or root fracture
26
materials used for temporary restorations? length of time last?
1. cavit - last for 2 weeks 2. IRM is less leakproof than cavit 3. TERM 4. Fugi XI 5. Composite
27
how to reinforce the tooth - one big answer
FERREL EFFECT
28
risk 1 with use of posts
can present a formidable obstruction to re-treatment
29
risk 2 with post
use of the rotary drill provides - an excellent opportunity to perforate the root (unless done correctly) - PIEZO reamers - dangerous in the canal
30
risk 2 with post
use of the rotary drill provides - an excellent opportunity to perforate the root (unless done correctly) - PIEZO reamers - dangerous in the canal
31
perforation if more apical?
better prognosis because away from the saliva more
32
what do you do if you cannot get the ferrule effect
1. crown lengthenign 2. extract and FPD or RPD 3. Extract and implant
33
discoloration comes from which mainly?
inadequate cleaning and shaping (leavingi necrotic tissue in the coronal horns) root filling material (gutta percha) retained in teh coronal aspect organic substances in dentin -- hemoglobin breadgown food and drink pigment
34
#2 cause of failure following successful RCT?
crown and or root fracture
35
ferrule dimensions?
must be at least 2mm - the amount of sound tooth structure located under a crown margin and the build up restorativie material must not impinge on biological width minimum thickness = 1mm ferrule walls almost parallel
36
Indirect posts aka
Casted
37
direct posts aka
1. prefabricated metal posts 2. fiber posts 3. zirconia posts
38
retention refers to
ability of post to resist vertical forces
39
resistance in a post refers to
abbility of the tooth / post combinatio to withstand lateral and rotational forces and is influenced by - the presence of a ferrule - the posts length and rigidity - the presence of anti-rotational features
40
indicationfor post
ONLY FOR RETENTION OF THE CORONAL RESTORATION - inn a tooth that otherwise meets ALL the requirements for conventional restoration
41
posts increase resistance to vertical fracture?
no -- may contribute to vertical and shear fracture
42
benefits to post
retention for crown better than pin retained build up
43
perforations are what?
one of the worst iatrogenic errors we can create tooth is compromised on all cases and repair is questionable
44
post requiremetns
1. ferrule effect with 2 mm of crown margin on root without impinging on biological width 2. 4.1mm minimum of tooth above bone
45
more then 50% tooth structure is gone what is indicated?
not necessarily a post -- but need core / plug
46
3-4 mm of cervical tooth structure? type of post if using one
fiber
47
if do not have 2mm for ferrule?
consider crown lengthening or orthodontic extrusion or extract for RPD FPD
48
minimum length of post
long as possible minimum is 1-1.5 x length of clinical crown (so length of clinical crown) 2/3 length of the root equal to length of crown 1/2 the bone support (need 4.1 mm of tooth above bone)
49
remaining root canal filling material?
4-5 mm
50
too big post? then what too small post? then what
too big --> root can break too small --> post can break
51
plugs use?
composite or amalgam but only if 50% oro more tooth strucutre
52
purpose of the plug
holds the core and the crown -- RETENTIVE FEATURE protect the apical seal from bacterial contamination usually it does not reinforce tooth structure

Endotontics (21 decks)

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