Root Canal Flashcards
Steps to a root canal:
1) Access prep
2) Cleaning and shaping
3) Filling/obturation
cause of primary vs secondary endodontic infection
Primary- bacteroides (gram negative obligate anaerobe)
Secondary- Enterococcis faecalis
most important step of RCT for technique
access
shape of access for incisors
triangular or ovoid on lingual surface
shape of access for canines
ovoid
shape of access for premolars
ovoid (narrow)
shape of access for maxillary molars
4 canals (2 in MB root) –> blunted triangle/rhomboidal
3 canals –> triangular
shape of access for mandibular molars
4 canals (2 canals/root) –> rectangular
3 canals (more common, 2 canals in D root) –> trapezoidal
Which premolar is the most common to have two roots and two canals?
maxillary 1st premolar
How far is WL from the apex?
0-2 mm
What is this method of cleaning and shaping?
Shape the coronal third –> apical third –> middle third (small to big) usually using hand instruments
Shaping the coronal third allows access for a file to reach the apical third, at which the operator can then shape from apical to coronal
Step-back
What is this method of cleaning and shaping?
Coronal –> apical direction usually using rotary instruments (use progressively smaller files as you reach more apical, change files when you feel resistance)
Crown-down
refers to filling and sealing the cleaned and shaped canal system
obturation
2 obturation materials
gutta percha filler + ZOE sealant
Name the obturation technique: Using a finger spreader for placement of multiple gutta percha cones to WL until spreader can no longer penetrate the coronal part of the canal
cold lateral
Name the obturation technique: seating gutta percha cone to WL and using a heated plugger instrument to compress the gutta percha
warm vertical