Brainscape's Knowledge GenomeTM

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


See full index

Endodontics > Obturation 1 > Flashcards

Obturation 1 Flashcards

1
Q

Goals of obturation

A
  • Completely fill prepared root canal space with biocompatible material
  • Eliminate space within root canal where bacteria can colonize
  • Eliminated bacterial leakage pathways
  • Seal any irritants that were not removed inside the system
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

When do we obturate?

A

1) Adequate preparation of the root canal is confirmed
2) Tooth is asymptomatic
3) Canals can be dried (no exudate)
4) Draining sinus is healed
5) Swelling has resolved
6) Anti-microbial dressing has been applied

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

List requirements of root canal filling material

A
  • Easily introduced to canal space
  • Seal canal laterally, apically, and coronally
  • No shrinkage
  • Impervious to moisture
  • Bacteriostatic
  • Non-staining
  • Biocompatible
  • Sterile
  • Removable
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

List types of filling material:

A
  • Single phase (not recommended)

- Dual phase -> solid core material + sealer cement

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

What are Gutta-percha points?

A
  • Solid core material
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Components of gutta-percha points

A
  • Zinc oxide (75%)
  • Gutta-percha (20%),
  • other
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Sizes of gutta-percha points

A
  • Standardized: 02, 04, 06 tapers

- Non-standardized: fine-fine < medium-fine < fine < fine-medium < medium < large < X-large

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

Advantages of gutta-percha points

A
  • Minimal tissue toxicity
  • Easily adapts to canal
  • Thermoplastic
  • Easily removed
  • Can be sterilized
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Disadvantages of gutta-percha points

A
  • Non-rigid
  • Non-adhesive (needs sealer)
  • Displaced with pressure
  • Shrinkage
  • Slight elasticity
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Other filling material (not recommended)

A
  • Silver points -> corrodes if contacts fluid, difficult to remove, do NOT seal canal laterally
  • Paste root fillings -> high chance of paste extruding past apical foramen
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Sealers’ purpose

A

Fills voids and provides seal between core material, accessory points, and the dentinal wall

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

Ideal properties of sealers:

A
  • Same as root filling material
  • Good adhesion to canal wall
  • Easy mixing
  • Slow setting
  • Insoluble in tissue fluid
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

List the types of sealers

A
  • Zinc oxide-eugenol based
  • Polymer resin
  • Silicone based
  • Glass ionomer
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is procosol?

A

Zinc oxide-eugenol (ZOE) based cement (sealer).

Standard sealer

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

Advantages of procosol

A
  • Well tolerated by periapical tissues if extruded past apical foramen
  • Provides good seal
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Disadvantages of procosol

A
  • No adhesive properties

- Does NOT tolerate moisture

17
Q

What is AH26

A

Bisphenol epoxy resin sealer

18
Q

Advantages of AH26

A
  • Slow setting
  • Not affected by moisture
  • Biocompatible
  • Radiopaque
  • Anti-microbial action
19
Q

Disadvantages

A
  • Staining

- Releases formaldehyde (but AH PLUS doesn’t release formaldehyde)

20
Q

List condensation equipment

A
  • Finger spreader
  • K file
  • 5/7 plugger
  • Glick 1
  • Westco-Mortensen plugger
21
Q

How is finger spreader used for condensation

A
  • Used to laterally condense GP points in canal
  • Accessory GP points are inserted in space made by Finger spreader
  • Yellow = smaller; red = wider
22
Q

K-file in condensation

A
  • Use to “paint” inside of canal with sealer

- Use size = MAF - 2

23
Q

5/7 Plugger in condensation

A
  • Measure height of CEJ prior to obturation and set rubber stopper to height
  • Used to check depth of vertical condensation. Want all Gutta-Percha to be below CEJ
  • Used to vertically condense small canals
24
Q

Glick 1 in condensation

A
  • Only instrument that is heated
  • Used to heat GP
  • Used to “sear off” intra-coronal GP
25
Q

Westco-mortenson plugger in condensation

A

Used to vertically condense large canals

26
Q

What is lateral condensation?

A

Multiple GP points are laterally packed and cemented with sealer

27
Q

Describe the steps of lateral condensation

A
  1. Fit Master GP point into canal to final working length - similar size to MAF: use largest point that fits to FWL and has tugback.
  2. Check that finger spread fits to at least 2 mm of FWL
  3. Apply sealer to Master GP and canal walls
  4. Use finger spread to create space adjacent to Master GP
  5. Insert accessory GP point into open space (do NOT add sealer to accessory GP)
  6. Repeat steps 4 and 5 until spreader only reaches to 2 mm apical of gingival margin
  7. Perform heat out and vertical condensation
28
Q

What is heat out and vertical condensation?

A

Heat GP points and vertical condense with packer

29
Q

Describe steps in heat out and vertical condensation

A
  1. Add more GP points if voids form

2. Vertically condense until all GP is below CEJ: NO GP in pulp chamber due to discolouration

30
Q

What is single point technique

A

Just place on solid point into canal. Used with silver points. Unlikely to provide 3D seal. Technique sensitive

31
Q

Describe steps of vertical condensation

A
  1. Measure GP about + 2mm short of tooth apex
  2. Use HOT finger spread to apply heat to GP
  3. Use Plunger to push GP down
  4. Repeat 2 and 3 until apical region of root canal is filled
  5. Back-fill the middle and coronal region of the canal
32
Q

How do you clean access cavity?

A

Microbrush dampened with: eucalyptus oil, chlorhexidine, alcohol

33
Q

List the ideal obturation criteria

A
  • Obturation is stops within 1mm of root apex
  • No visible voids
  • Uniform density
  • Smooth lateral margins which reflect tapered shape of canal
  • No filling material above gingival margin

Endodontics (9 decks)

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