Thursday, May 28, 2015

Retention

retention



       RETENTION


         The essential element of retention is two opposing vertical surfaces of the same preparation.
         These may be external surfaces such as the buccal and lingual walls of a full veneer crown (sleeve retention).



RETENTION
         The opposing surfaces can also be internal, such as the buccal and lingual walls of the proximal box of a inlay.

         An intracoronal restoration resists displacement by wedge retention.

         Many restorations are a combination of the two types.
 



0 comments:

Post a Comment

share your opinion