placement of an indirect restoration requires preparation
of a cavity with undercut-free cavity walls to allow a path
of withdrawal and insertion of the completed restoration.
This allows a pattern or impression to be removed from the
cavity. The finished restoration should be capable of insertion
into the tooth without the generation of stress. Preservation
of remaining tooth structure is important because the restoration
relies on the strength and integrity of the remaining prepared
tooth substance for retention. The restoration can be used
to protect and reinforce the remaining tooth structure to
some extent, but the less remaining enamel and dentine,
the greater the risk of mechanical or biological failure.
restorations must be cemented or bonded into place to provide
retention and cavity margin seal. The degree of retention
available for a non-adhesive indirect restoration depends
upon the surface area of the opposing vertical walls of
the cavity and their degree of convergence. Only when the
restoration is adhesively luted with a resin-based luting
cement combined with an enamel/dentine adhesive is the luting
agent a major contributor to retention.
restorations may be:
• intracoronal (inlays)
• extracoronal (crowns)
• a combination of intra- and extracoronal (onlays).
• wholly metallic (precious or non-precious alloys)
• a combination of the above (metal-ceramic crown)
Crowns may cover all available surfaces of the tooth (full
veneer crowns), or they may be partial veneer (e.g. three-quarter
or seven-eights crowns).
stages in the clinical procedure involved in an indirect
restoration are usually as follows:
Decision as to restoration type (full or partial coverage;
intracoronal or extracoronal), materials and method of luting
(conventional cementation or bonding with a resin-based
2. Discussion with patient before tooth preparation stage
as to type of restoration and aesthetic implications
3. Tooth preparation (this may require prior occlusal adjustment
or diagnostic wax-up to facilitate production of provisional
4. Fabrication of temporary/provisional restoration
5. Impressions and occlusal records
6. Shade selection
8. Cementation or bonding.
Crown & Bridge basic
• Restoration Assessment
• Restoration choice
• Tooth preparation