Obturation Techniques Flashcards
What is the aim of Obturation?
establish a fluid-tight barrier to protect the
periradicular tissues from microorganisms that reside in the oral cavity.
What are the 3 purposes of Obturation?
- Prevent coronal leakage of microorganisms or potential nutrients to
support their growth into the dead space of the root canal system. - Prevent periapical or periodontal fluids percolating into the root canals
and feeding microorganisms. - Entomb any residual microorganisms that have survived the
debridement and disinfection stages of treatment, in order to prevent
their proliferation and pathogenicity.
What is required for a good 3D seal?
Adequate preparation is essential for adequate
obturation.
Root canal sealers are used in conjunction with a biologically acceptable semi-solid obturating material such as gutta-percha to establish an adequate seal of the root canal system.
The root canal systems need to be three
dimensionally obturated.
2 components of Obturation?
Core material and sealer
what are th ideal properties of Obturation material?
Easily introduced into the lot canal system
Should not shrink after being inserted
Should be bacteriostatic or at least not encourage bacterial growth
Shown not stain tooth structure
Should be sterile or easily and quickly steralized immediately before insertion
Should seal canal laterally as well as apically
Should be impervious to moisture
Should be radio-opaque
Should not irritate periapical tissue
Should be easily removed from the root cabal if necessary
purpose of root canal sealers?
- Fill in the gap between the dentinal wall and the core root filling
material. - Fill space between the core segments (depending on technique).
- Fill in irregularities within the canal system i.e. occlusion of
accessory canals and isthmi between canals.
Ideal properties for root canal sealer?
Should exhibit tackiness when mixed to provide good adhesion to the canal wall when set
Should be radio-opaque
Should be bacteriostatic or at least not encourage bacterial growth
Should not be soluble in tissue fluids
Should be soluble in a common solvent if it is necessary to remove it
Should establish a hermetic seal
Should be prepared in very fine powder so it can mix liquid easily
Should not stain tooth structure
Should exhibit slow set
Should not irritate periapical tissue
What is the most common sealer?
Zinc oxide euganol
And resin
brand name of ZOE sealer?
tubli-seal
Pros of ZOE?
long history
Absorbed if extruded
Slow setting time
Antimicrobial effect
Radio-opaque
cons of ZOE?
Shrinkage on setting
Soluble
Stain tooth structure Should
Negative affect bonding
how to remove excess ZOE?
pledget soaked in alcohol
Options for sealers?
Calcium hydroxide
ZOE
GIC
Resin
Silicone
Bioceramics
examples of COH?
Apexit
Sealapex
pros of COH?
Antimicrobial
Radio-opaque
Good tissue tolerance
cons of COH?
Soluble
Weakens dentine
Can crumble wen set
GIC and sealers during RCT?
Not really used now
pros of GIC?
Dentine bonding properties
High compressive strength
cons of GIC?
Minimal/no antimicrob8al effects
Difficult. Remove in retreatment
Reduce retreivability
pro of resin asa sealer?
Ling history of use
Adhere to dentine
Some adhere to core
No euganol
Slow setting
cons of resin for sealing RCT?
Some releases of formaldehyde when setting
Certain irritants reduce bind strength
May not bond more effectively than conventional sealers
Negatives of euganol from ZOE?
Redness, itching, or swelling
Difficulty breathing
Mouth sores
Burning sensation in the mouth
Throat tightness
Tongue swelling
In rare cases, anaphylaxis, a severe allergic reaction
Examples of resin for RCT?
AH plus
Diabetes
Epiphany
Real seal
examples of silicone for RCT?
Guttaflow 2
Roekoseal