Post Crowns Flashcards
what may be used to aid GP removal
heat
solvents e.g eucalyptus oil
how much GP should be left in the canal to achieve a good apical seal when prepping for a post
4-5mm
what kit may be used to create an indirect post
para post system
what should be taken into account when considering a post retained restoration
- amount of supragingival tooth structure
- position of tooth in the arch
- opposing dentition
- length, width and curvature of the roots
name 3 consequences of endo treatment
brittleness
loss of proprioception
decreased fracture resistance
what is a post
a peg or a pin for fastening an artificial crown or core to a natural tooth root
usually made of metal or fibre
when are posts required to retain an indirect restoration
when 3 or more walls of a tooth are missing
what is the optimum and minimum height for a ferrule
optimum = 2-3mm coronal dentine
minimum = 1.5mm
what does a ferrule give protection from
resists tooth fracture
what are the optimal dimensions for a post
1/2 to 2/3 length of root (at least equal to height of crown)
good apical seal (4-5mm)
diameter no more than 1/3 root diameter
placed in straight part of canal
does length and diameter of post increase retention
increased length does increase retention
increased diameter does no
diameter should be no more than 1/3 of root diameter
what materials can be used for posts
metal - stainless steel, cast metal, titanium
non metal - glass fibre, ceramic fibre
what are the different types of post shapes and textures
parallel or tapered
serated, smooth or threaded (screw like)
discuss the cons of cast metal posts
cons: direct/ indirect technique requires impressions, lab and extra clinical stages, more room for error
discuss cons of fibre posts
cons: difficult to remove upon retreatment
