Endodontics Flashcards
1
Q
Aetiology of endodontic disease
A
- Bacterial invasion
- Development of bacterial ecosystem
- Biofilm formation
2
Q
What radiograph do we require and what are we assessing on the radiograph?
A
- Undistored PA to show all root and 2-3mm surrounding peri-radicular tissue
- Any PA pathology
- Anatomy of root canal system
- Canal calcifications
- Angulation of root
- No. length and moprphology or roots
- Prox of vital structures
3
Q
Why must all caries be removed prior to endo?
A
- Allows assessment of restorability
- Creates environment suitable for obtaining adequate iso
- No active disease to tampre with root canal system
4
Q
Why might it be beneficial to build up walls of tooth pre-endo?
A
- Clamp placement
- Four walled access cavity
- Control irrigant
- Control saliva
5
Q
Why place a dental dam?
A
- Eliminate bacterial contamination
- Prevent inhalation of instruments
- Retracts tongues and protects ST and tongue
- Prevents pt rinsing , chatting
- reduces chairside time and operator stress
6
Q
What endo instruments are utilised?>
A
- Mirror front facing
- Locking tweezers
- Probe
- DG 16
- Excavator
- Flat plastic
- Burnisher
7
Q
Objective of Access cavity Preparation
A
- Remove entire roof allowing complete removal of pulpal tissue
- Allow visualisation of root canal orifices
- Produce smooth walled prep with no overhangs
- Allow unimpeded straight-line access of instruments
- Reservoir for canal irrigant
- Conservative as poss
8
Q
What are the design objectives for RCT?
A
- Create continuously tapering funnel shape
- Maintain apical foramen in orig pos
- Keep apical opening as small as poss
9
Q
Describe the Watch winding techqniue
A
- Back and forward oscillation of 30-60degrees
- Light apical pressure
- Use with K files
10
Q
Describe the balanced force technique
A
- Useful for instrumenttaion of curved canals
- Insert file and engage CW into dentin 1/4 turn
- With continued P go CC 1/2 turn to strip dentin away
- Done 1 to 3 times before removing file to remove debris and check file
- Remove , clean , reintroduce to WL
11
Q
Objectives of Root canal irrigants
A
- Disinfect root canal
- Dissolve organic debris
- Flush out debris
- Lubricate root canal instruments
- Remove endodontic smear layer
12
Q
What syringe is used for root canal irrigants?
A
- Luer lock syringe
- 27 gauge endodontic tipped needle
- Press with forefinger not thumb
- Ensure correctly labelled
13
Q
Why do we do coronal flaring before apical prep?
A
- Avoids hydrostatic pressure in canal
- Early removal of heavily contaminated contents
- Improved straight line access to apical 1/3rd
14
Q
Give the methods of Coronal flaring
A
- Step down technique
- Double flare technique
- Crown down Pressureless technique
15
Q
Describe how to Canal Access
A
- PA
- Outline cavity design and use diamond fissure bur
- Rubber dam
- Penetrate pulp chamber at single point above canal orifice
- Use safe ended endo access bur to remove entire pulp chamber
- Flush chamber and coronal aspect with 2% sodium hypochlorite
- Use DG 16 endo probe to locate canal orifice
- Modify to allow straight line access