Post Flashcards
Name 3 types of posts
Parallel, tapered, shenker
When is shenker post indicated
Ferrule less than 2mm minimal tooth structure left
What are the advantages of shenker post
Combination of parallel and tapered post
What are the criteria important for a post (5)
- Length of post
- Width of post
- Ferrule
- Occlusion
- Quality of rct
Tapered post vs parallel post
Tapered maintain as much internal dentine as possible but lacks resistance retention form
Parallel - prep more of internal dentine
Advantage of using paperclip rather than impression post for imps
Can be made to fit into the canal with space around it (able to get more impression material around it)
What cement is used to cement a cast post and core
Zinc phosphate
What should the Occlusion on a post be
No guidance and light icp
Advantages of duralay post and core
Can control the shape of the post and core
No impression required afterwards
Can add to it if there are voids present
The post will fit the prep
What are the four advantages of fibre posts
-Aesthetics -tooth coloured
- Adhesively retained
- Direct post and core
-The fibre post gas the same elasticity of the tooth
What are the 4 disadvantages of fibre post
-Unpredictable bond strength
- Unpredictable strength
- Tooth must have a Ferrule post alone is not strong enough
- Need to prep a root canal to fit a premade post
What cement is used for a fibre post
7th generation self etching cement
Eg relyx
(Can’t be light cured how will light reach )
What are the indications for a nayyar core Post
- Divergent canals
- at least 2mm Ferrule
What are the criteria for a split cast post and core (3)
No clinical crown
Divergent root canals
2mm Ferrule
