obturation of rct system Flashcards
importance of obturation
study by Ingle et al (1965) indicated 58% of failures due to incomplete obturation
APICAL SEAL is usually a problem
filling of the system should
prevent the passage of microorganisms and fluid along the root canal and to fill the whole canal system
Not only block the apical foramina but also the dentinal tubules and accessory canals
working length for obturation
prep should end at the junction of pulpal and periapical tissue
should be really close to CDJ = the narrowest part of the canal = apical constriction
wl radiographically determined
Distance is from 0-3 mm
Varying constriction anatomy
Increasing with age
Root resorption is a complicating factor
If filled to apex then over-filled?
filling should happen when
after the completion of root canal preparation and when the infection is considered to have been eliminated and the canal can be dried
timing of obturation
signs
symptoms
pulp status
periapical status
difficulty
patient management
gutta-percha
Most common core material
One of oldest dental material in use today
Produced from juice of trees of the sapodilla family
Natural rubber and gutta percha are polymers of same monomer - isoprene
Trans isomer of polyisoprene
GP presentation
20% Gutta-percha
65% Zinc Oxide
10% Radiopacifiers
5% Plasticizers
gp cold lateral compaction
Most commonly taught and practiced filling technique
Regarded as the benchmark against which other obturation techniques are evaluated
Low cost and ability to control the length of the fill
Potential problems:
Voids, spreader tracts, incomplete fusion of gutta-percha cones, and lack of surface adaptation
size-matched GP cones
Sized-matched cones complement file size and shape
Leave very little space for accessory cones
Is this a single point obturation technique?
warm vertical compaction
Schilder introduced this as method to achieve three dimensional obturation
Required a continuously tapering funnel and minimal apical diameter
SET IT WITH HEAT, SO SEALER TRAVELS THROUGH
use a GP plugger
gives 3D
progressed to continuous wave obturation with new machines
also carrier-based obturation for long canals
disadvantages of thermal techniques
apical control -> can dislodge into maxillary sinus
if we are not in control
use biodentine, MTA
they fill more complex spaces
is the evidence watertight?
“It is clear that sealability studies comparing endodontic procedures using the penetration of dyes, chemicals, etc. are not useful to endodontic science and the Editorial Board has agreed to restrict publication of sealability studies using these techniques.”
resilon
Resin-based system
Dentine bonding technology
Thermoplastic synthetic polymer based on polymers of polyester containing bioactive glass and radiopaque fillers
“Mono-block”
