In order for a crown or bridge to be successful, an adequate amount of stable tooth structure must be present to act as a base for the restoration. Tooth structure may be lost due to caries, fracture, or an old restoration may need to be replaced. A post or pin may be necessary to act as structural reinforcement for a restorative core buildup material (see Figure 1). Core buildup materials are used to replace missing tooth structure and to provide a strong base for a new crown or bridge. The core should be made in a shape that provides mechanical retention for a laboratory-fabricated restoration.

Figure 1. Post cemented in place.
3M™ RelyX™ ARC Adhesive Resin Cement may be used, along with 3M™ Single Bond Dental Adhesive System, for bonding endodontic posts.
Core Buildup materials are used to replace missing tooth structure and to provide a strong base for a new crown or bridge. The core should be made in a shape that provides mechanical retention for a laboratory-fabricated restoration.
Selecting a Core Buildup Material Type
Resin Modified Glass Ionomers
(e.g. 3M™ Vitremer™ Core Buildup/Restorative)
Advantages
Some allow for bulk placement and cure
High fluoride release
Provides a chemical bond to tooth structure
Disadvantages
May require hand-mixing
Compomers and Composites (e,g, 3M™ F2000 Compomer Restorative & 3M™ Z100™ Restorative)
Advantages
Strength
Disadvantages
Incremental placement is required if light cured
An adhesive system is required
Amalgam
Advantages
Strength
Long history of clinical use
Disadvantages
Requires second appointment
No bond to tooth structure
Concerns regarding mercury toxicity
Esthetic considerations (may show through restoration)
Note: 3M recommends 3M Vitremer Core Buildup/ Restorative as a core buildup material where half the coronal tooth structure is remaining. 3M™ Z100 Restorative, and 3M™ F2000 Compomer Restorative are also recommended.




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