post and core crown is a type of dental restoration required where there is an inadequate amount of sound tooth tissue remaining to retain a conventional crown. A post is cemented into a prepared root canal, which retains a core restoration, which retains the final crown.
The role of the post is firstly to retain a core restoration and crown, and secondly to redistribute stresses down onto the root, thereby reducing the risk of coronal fracture.
3. WHAT IS A POST?
A relatively rigid material inserted
into the root of an endodontically
treated tooth.
It extends coronally to anchor the
core material which support the
crown.
4. WHAT IS CORE
• Core is the supragingival portion which
replaces the missing coronal tooth
structure.
• It acts as a miniature crown
5. CONT..
• “ The fore most purpose of the post is to provide retention for the
core and coronal restoration”.
• The post functions primarily to aid in the retention of the
restoration & to protect the tooth by dissipating or disbursing
forces, along the length of the root.
• The post itself does not strengthen a tooth.
6. PURPOSE OF USE POST AND CORE
• Helps in retaining the core
• Helps in favorable distribution of the stresses through the radicular
portion of the tooth to the apex.
7. BEFORE GOING FOR POST &CORE, WE SHOULD
EVALUATE:
• Restorability of the tooth
• Role of the tooth in the mouth
• Periodontal consideration
• Functional loading
8. REQUIREMENTS OF A TOOTH TO ACCEPT POST AND
CORE
• Optimal apical seal
• Absence of fistula or exudate
• Absence of active inflammation
• No sensitivity to percussion
• Absence of associated PD diseases
• Sufficient bone support around the root
• Sound tooth structure coronal to alveolar bone
• No root fracture
9. -Where the natural crown of root-filled teeth either has been lost or is
extensively damaged.
-Where the root-filled tooth is to be used as bridge abutment.
-Where a change in axial position greater than 1mm is required.
-In a crowned anterior endodontically involved tooth, to reinforce the
crown covered tooth at cervical area susceptible to fracture.
INDICATIONS FOR POST AND CORE
10. CONTRAINDICATIONS
• Any sign of endodontic failure are evident
• If adequate retention of core can be achieved by natural crown
• When tooth is subjected to extrusive occlusal stress as bruxism
• Severe curvature of the root-eg: Dilacerations of the root.
• Poor periodontal health
• Poor crown to root ratio
• Weak / fragile roots
• Teeth with heavy occlusal contacts
• Inadequate skill.
12. FOR ANTERIOR TEETH
• If there is doubt about the adequency of resistance form of the coronal portion of
the tooth for any rosteration post and core indicated.
• Otherwise, anterior teeth can be restored by direct restoration of acess opening
or by bleching and veneer for devitalized tooth.
13.
14.
15. FOR POSTERIOR TEETH
• in severely damaged structures
• if the tooth serves as an abutment for removable partial
denture
