Endo teeth Flashcards
The teeth become _____ and ____ susceptible to decay, fracture, and
breakdown.
softer; more
T/F: Once pulp has been removed, and nerve sensation stopped, the tooth loses its
ability to monitor changes in proprioception. Meaning you can bite harder
on these teeth before you feel pain or discomfort.
True
The tooth now is less strong and both of the above criteria result in a higher
likelihood of _______
FRACTURE
____ fracture
Fracture in enamel only (crack line) or fracture in
enamel and dentin
The fracture line does not extend apical to the
cemento-enamel junction
There is no associated periodontal probing defect
The pulp may be vital requiring only a crown
If pulp has irreversible pulpitis or necrosis, root
canal treatment is indicated before the crown is
placed
Favorable
____ fracture
Fracture in enamel and dentin
The fracture line may extend apical to the
cemento-enamel junction but there is no
associated periodontal probing defect
There is an osseous lesion of endodontic
origin
Questionable
\_\_\_\_ fracture Fracture line extends apical to the cementoenamel junction extending onto the root with an associated probing defect
Unfavorable
________ tooth fractures occur because:
- Greater occlusal forces
- Divided occlusal surface (Cusps and Fossa)
- Fillings weaken tooth ability to hold together
Posterior
Crowns did NOT significantly improve the
success rates of endodontically treated
______teeth when ample tooth
structure remains.
ANTERIOR
Crowns significantly improved
success rates of endodontically
treated _______ teeth
POSTERIOR
Crowns are only indicated on RCT Treated ______ teeth when:
-They are structurally weakened by large or multiple restorations
-They need substantial changes in form or color that cannot be achieved
by more conservative means
ANTERIOR
Need at least __mm for a ferrule.
2 mm
If sufficient natural tooth structure remains, a _______ will
fill the RCT access and chamber to restore the lost tooth
structure.
Build up/Core
_______ has been as used a core material for a long time
but not as much now.
-Disadvantage – not retentive, does not bond, more tooth
reduction needed
-Advantage – strength
Amalgam
_______ are used much more now for core build up
-Disavantage – not as strong
-Advantage – usability, bonding, more conservative tooth
reduction
Composite resins
If tooth structure is missing, and restorability is
compromised but not condemned, a ___ can
be used to add strength to the core build up as
you restore the lost tooth structure.
post
Why do we use a ____?
-RCT teeth with inadequate tooth structure to retain a core
-Teeth that have lost more than 50% of coronal tooth structure
-Single rooted teeth since the anatomy of the pulp chamber
does not offer mechanical retention.
-Teeth with significant response to lateral forces of occlusion.
post
Teeth that have lost more than __% of coronal tooth structure need a post
50%
In these situations, post or no post?
-Preparation of a post space adds risk to the restorative
prognosis
-Higher likelihood of fracture or perforation
The needs for a post vary between anterior and posterior.
No post
Post or no post? Anterior Teeth – Patient presents with an intact anterior moderate sized lingual RCT access with a resin composite restoration in the access If tooth has darkened: -Internal bleaching -Possible veneer or composite
No opst
In access hole, place bleaching material and seal the access with a temporary fill. May need to be repeated several times. Can last for a reasonable amount of time and may need to be touched up in the future.
Internal bleaching
When more than \_\_\_% of coronal tooth structure has been lost - A post and core will be necessary for retention of a crown. The post and core is meant to resist lateral forces which would cause the crown to dislodge.
50%
A _____ is the vertical axial wall that encircles the
tooth which a crown will use to resist fracture
ferrule
Minimum ferrule =___mm beyond the core
2mm
T/F: Without the proper ferrule, root fracture is much more l
ikely on anterior teeth due to high lateral forces in
mastication.
True