Resto of Endo Tooth + Endo Interface Flashcards
Clinical assessment of endo tx tooth
Coronal seal
Swelling
Sinus/abscess
TTP
Buccal sulcus
Mobility
Pocketing
BOP
Remaining tooth structure - ferrule
Occlusion - 2mm inter occlusal space
Radiographic assessment of endo tx tooth
Obturation - adequate length/quality/voids
Any unfilled/missed RC’s
No PAP
Bone loss
Caries
Root anatomy - crown to root ratio 1:1.5
Function of a post/core
Gain inter-radicular support
Function of core
Retention
Function of post
Retains core
Post risks to consent patient requiring this
Secondary caries
Root fracture
Post fracture
Core fracture
Perforation
Depends on amount of ferrule
Infection requiring reRCT
Bruxism/deep OB/edge to edge inc fracture risk
Function of cuspal coverage
Prevents microleakage
Prevents fracture through buccal wall
What teeth are posts recommended for?
Anteriors
- Avoid in mandibular due to thin tapering narrow m+d roots
Premolars
- Avoid in curved canals as perforation risk
Molars
- avoid, can insert for short distance in straightest canal
List the ideal post characteristics (3)
Parallel sided
- More retentive
- Avoids wedging
Non threaded
- Smooth so less stress on root
Cement retained
- Acts as buffer between masticatory forces + tooth
List the ideal post dimensions
1:1 crown length: post length
At least half post length into root
4-5mm apical GP
Post width no more than 3rd of root width at narrowest point
1.5mm ferrule
Classification of posts (4)
Manufacture - direct/indirect
Materials - metal/ceramic/fibre
Post shape - parallel/tapered
Post texture - smooth/serated
What is a Nayyar core?
AM packed into RC’s for retention
Can’t be prepped for 24hrs
Tx for post perforation
Periradicular surgery
XLa
Methods for post removal
Moskito forceps
Anthogyr
Sliding hammer
Eggler forceps
Masseran kit
Ultrasonic
Steps for indirect post
Putty for provisional
Crown prep
GP removal 4-5mm remains apical plug
Use the parapost kit to same length
Try in impression post (make notches + trim to incisal length)
Indirect impressions + opposing + jaw reg
Temp post + temp
Lab card for post
Please construct cast post + core MCC for tooth
Parapost colour
Core 6 degree taper
Please leave 2mm space in occlusion for crown
Cast U+L imps + articulate to jaw refi provided
List adv + disadvantage of direct + indirect posts
DIRECT ADV
- Same day placement, low cost + no lab
DIRECT DISADV
- Not accurate, need ferrule, not for wider canals
INDIRECT ADV
- Accurate fit, ok if less ferrule, used for wider canals
DIRECT DISADV
- imps, high cost + lab
List some adv + disadvantages of metal, ceramic + fibre posts
METAL ADV
-Radiopaque, easily retrievable, better fit to crown
METAL DISADV
- Aesthetics, corrosion, root fracture, nickel sensitivity
CERAMIC ADV
- High flexural strength, high fracture toughness, aesthetics
CERAMIC DISADV
- Difficult retrievability, root fracture, technique sensitive (silane equally spread)
FIBRE ADV
- Flexible, similar properties to dentine, replicates elastic root modulus, aesthetic, allows light cure through post
FIBRE DISADV
- Radiopaque, difficulty retrievability
List some adv and disadvantages of post shape
PARALLEL ADV
- More retentive, avoids wedging, decreased stress on root
PARALLEL DISADV
- Less conservative
TAPERED ADV
- More conservative, increased strength
TAPERED DISADV
- Increased stress on root, less retentive
List some adv and disadvantages of post texture
SMOOTH ADV
- Passive fit, less stress on root
SMOOTH DISADV
- Less retentive
SERRATED ADV
- Increased retention
SERRATED DISADV
- Increased stress on root
