Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Fixed Prosth 3rd year > L3- Tx on endo teeth > Flashcards

L3- Tx on endo teeth Flashcards

1
Q

proper diagnosis and tx planning occurs?

A

BEFORE the RCT – this is critical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

questions we ask before tx planning

A
  1. is it restorable?

how much coronal and radicular tooth structure is left?

is it periodontally sound?

what is the root morphology?

what is the condition of adjacent teeth?

s the tooth an abutment for a FPD or RPD?

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

main restorative options for endo treated teeth

A
  1. direct restoratino
  2. onlay (partial coverage restoration)
  3. crown (full coverage restoration)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

success rates of psoterior teeth without coronal coverage

A

1 year– 96%

2 year – 88%

5 year – 36%

*SIGNIFICANT IMPROVEMENT CAN BE MADE IF PULPESS TEETH ARE CROWNED

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

purpose of the core

A

the objective of a core buildup is primarily to replace missing coronal tooth structure sufficiently to provide adequate retention and resistance for the crown that will eventually restore the function and the aesthetics of the tooth in the treatment

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

post indicated?

A

post is indicated where there is inadequate remaining coronal tooth structure to retain a core for an artifical crown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

use post when? - general

A

ONLY WHEN NECESSARY

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Three factors for good post

A
  1. apical seal
  2. proper length of post
  3. ferrule effect
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

success with post was hihest when?

A

with a parallel sided serrated post

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

effects of an adequate ferrule

A
  1. reduce ris of root fracture
  2. reduce risk of post fracture
  3. reduce ris of post and core dislodgment
  4. reduce failure of cement seal of artifical corwn
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

dimensions of ferrule

A

must be at least 1.5 to 2.0 mm of tooth structure apical to the core

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

post fractures share what similarities

A

all post fractures showed a smiliar pattern ot a lack of a ferrule effect of the metal collar at the CROWN MARGIN AREA AND A SHARP INTERFACE between the post and core

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

ways to increase the ferrule

A
  1. crown lengthening
  2. forced eruption
  3. subgingival prep
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

length of post related to success - general

A

longer posts = higher success rates

if the length of post = the length of crown – increased failure rate

25% increase in failure rate if the post was 1/4 the length of the crown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

posts associated with vertically fractured enfo treated teeth

A

2/3 of them were a result of an extremely SHORT post terminating int the CERVICAL third of the roots

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what stress increases a lot when shorter ferrule

A

shear stresses increased substantially as post length decreased

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

corwn length related to length of post in terms of force

A

if the crown is double the length of the post, the force of the crown is doubled in the root

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

ratio 1:1 to post and crown?

A

force is equal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

if post is 1/4 lnegth of crown?

A

the force is multiplied by a factor of 4

saw a 25% failure rate (10 fold increase compared to 2.5 % failure rate when the length of the post = length of the crown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

fracture toughness proportional to?

A

directly proportional to bulk

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

width of post?

A

if width of post exceeds 1/2 of the width of the root – the success rate is much lower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

shape and stress in the post

A

if tapered post – stresses are in the cervical area

if parallel post – the stresses are more apical portions (concentrates stresses more apically)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

apical seal with a post?

A

at least 4-5 mm of apical gutta percha MUST be retained in order to avoid reindection of the peri-apical region

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

ranking order of strength of core materials

A
  1. silver amalgam
  2. composite resin
  3. silver modified glass ionomer cement
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

materials for pre-fab post

A
  1. metal

2. fiber-reinforced

26
Q

techniques for cast post and core

A
  1. indirect

2. direct

27
Q

GG cutting tip?

A

GG - HAS NO CUTTING TIP

28
Q

zinc phosphate is a?

A

cement

29
Q

indications for prefabricated posts

A

multiple rooted teeth with canals that are relatively ciruclar in corss section

  1. molars and some pre-molars , missing 1/2 of coronal dentin
30
Q

indications for prefabricated posts

A

multiple rooted teeth with canals that are relatively ciruclar in corss section

  1. molars and some pre-molars , missing 1/2 of coronal dentin
31
Q

contraindications for prefab posts

A

large, tapered canals

small single rooted teeth like mandibular anteriors

32
Q

advantages of pre fab posts

A

one office visit

ease of placement

less expensive to fabricate

can be made with composite

cores allowing for final impression on the same day

33
Q

disadvantages to prefab posts

A

are best used in canals that are round

the core is retained mechanically and can disengage from the post

requires dentin removal at the apical third

34
Q

para-post available in what material

A

stainless steel and titanium

35
Q

key factors in governing the longevitiy of the restoration

A

the number of cavity walls and the presence of a ferrule – rather than the material used for the post

36
Q

key factors in governing the longevitiy of the restoration

A

the number of cavity walls and the presence of a ferrule – rather than the material used for the post

37
Q

general rule for location of cast posts and cores

A

on anterior teeth and pre-molars

38
Q

prefabricated and para posts general location

A

posts used on molars

39
Q

3 factors for proper ost and core

A

360 degree ferulle effect

length of post

apical seal

40
Q

what dictates necessity of post

A

amount of tooth structure

41
Q

study of sorenson and martinof showed what in terms of posts?

A

success was highest with parallel sided serrated post

42
Q

study of torbjorner in terms of post fracture

A

all post fractures showed a similar pattern of a lack of ferrule effect of the metal colar at the crown margin area and a sharp interface between post and core

43
Q

stress that is increased when post length is not adequate

A

increase in peak SHEAR stresses

44
Q

advantages of csat post and core

A
  1. they are custom to fit the root configuration

2. they are adaptable to large irregulary shaped canal and orifices

45
Q

disadvantages of cast post and core

A
  1. expensice
  2. requires two appointments
  3. temporization appointment is more difficult
  4. may require the removal of additional coronal tooth structure
46
Q

advantages and disadvantages of zinc phosphate cement

A

long history of success
inexpensive
long working time
reaches 75% of strength in 1 hr and brittle hard within 10 minutes

disadvantage

  • soluble in oral fluids
  • bond is mechanical
47
Q

zinc polycarboxylate is

A

a cement

48
Q

advantages and disadvantages of zinc polycarboxylate

A

advantages

  • chemical bond (but weak)
  • inexpensive
  • easy to manipulate

disadvantage

  • soluble in oral fluids
  • undergoes plstic deformation
49
Q

glass ionmer can be used as a

A

cement

50
Q

advantages and disdvantages of glass ionmer as cement

A

advantages

  • chemical bond
  • relatively inexpensive
  • easy to manipulate
  • fluoride release

disadvantage

  • very soluble in oral fluids
  • final set takes up to days / prolonged
51
Q

advantages and disadvantages to resin modified glass ionomer cement

A

advantages

  • chemical bond (acid from cement)/ resin bond
  • fluoride release
  • good compressive strength
  • easy to manipulate

disadvantages

  • expansion - hygroscopic
  • soluble in oral fluids
52
Q

advantages and disadvantages to resin cement

A

advantages

  • bond to tooth
  • high compressive strength
  • essentially insoluble

disadvantage

  • technique sensitive (etch canal with application of bonding agent)
  • expensive
  • sensitive to eugenol
  • inhibition layer (cement line)
53
Q

coat ___ first when using cement?

A

coat the post with cement first always

54
Q

cementation technique

A

use lentulo spiral to coat the canal

55
Q

direct technique

A

uses GC pattern resin of canal then cast it

56
Q

indirect technique of cast post and core

A

take impression and make die – do GC pattenr resin on the cast

57
Q

T/F pre-fabricated posts require removal of dentin

A

TRUE– in the apical third

58
Q

wide divergent canal use parapost?

A

NO – they are best used in canals that are round

59
Q

cast post used where?

A

anterior teeth and pre-molars

60
Q

prefabricated posts used?

A

molars

Fixed Prosth 3rd year (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions