Post and Core

Question 1

What is Restorability Assessment?

Answer 1

= assessment of all factors related to remaining tooth structure and supporting structures, which will permit predictable placement and retention
of a functional and if necessary aesthetic restoration, without causing damage to
the surrounding tissues

Question 2

Which factors affect Restorability Assessment?

Answer 2

• remaining tooth structure
• periodontal status
• endodontic status
• patient status
• dentition
• ferrule effect

Question 3

How to regain ferrule effect with teeth broken down at or below the gingival margin?

Answer 3

1. Surgical crown lengthening
2. Orthodontic extrusion
3. Surgical extrusion

Question 4

Function of cracked tooth:

Answer 4

= incomplete fracture initiated from crown and extends subgingivally, directed MD

Question 5

Function of splint tooth:

Answer 5

= complete fracture initiated from the crown and extending subgingivally, usually directed MD through both of the marginal ridges and the proximal surfaces

Question 6

How is surgical crown lengthening performed?

Answer 6

=> by gingivectomy and/or bone removal

Question 7

What is orthodontic extrusion (forced eruption)?

Answer 7

Movement of a tooth by applying

extrusion forces in all regions of the periodontal ligament

Question 8

What is surgical extrusion?

Answer 8

The remaining tooth structure is repositioned at a more coronal / supra-gingival position in the same socket in which the tooth was
located originally

Question 9

How to restore posterior teeth?

Answer 9

• posts don’t increase R so we dont need them -> premolars require post more often than M
• coronal coverage improves clinical success
• crown placement (NO cuspal coverage)
• both M and D contacts
• tooth not serving as a RPD or fixed bridge abutment (no RCT)
• RCT
• premolars are more likely than molars to be subjected to lateral forces
• try to conserve dentine
• direct or indirect onlays
• premolars have longer survival rate than molars

Question 10

How to restore anterior teeth?

Answer 10

• coronal coverage doesn’t improve clinical success
• must resist lateral forces
• post indicated when crown is planned
• crowns don’t improve the success of endo treated teeth
• bleaching of discoloured teeth instead of crowning

Question 11

Why root filled teeth have a higher risk of fracture?

Answer 11

• Dehydration of dentine and transformation of collagen fibre structure
• Reduction of the flexural strength and modulus of elasticity of dentine by NaOCl irrigation and Ca(OH)2 medication during RCT
• Loss of proprioception (protective feedback mechanism) after pulp removal
• Missing tooth structure caused by caries and previous extensive restorations
• Loss of structural integrity associated with access preparation during endodontic treatment

Question 12

Contra-indication for treatment?

Answer 12

vertical root fracture and

split tooth