Enhanced Verifiable CPD from the
University of Birmingham

Post-crown Preparations:
Understanding The Ferrule Effect (5)

Here's a representation of the preparation:

Dentine prepared to receive ferrule
Space prepared for post
Post and core fitted
Crown provides the ferrule effect. Lateral forces transmitted from the crown to the post result in dentine compression coronally.

The yellow area is the part of the crown that provides a ferrule (Radiograph No 4)


This post-crown prep has a 2mm ferruled area all the way round.
The ferrule preparation should incorporate at least 1 to 2 mm of dentine all round the tooth.

    magnify    magnify
Click these images to see the preparation shapes

This post-crown prep only has a partial ferruled area. This tooth has a limited life ahead of it. Expect post decementation, or root fracture.

Once the crown is on, lateral forces will put the dentine and the post-cement under tension.

One or the other will give !

If you can not achieve a ferrule effect (as in the picture above), you should consider crown-lengthening (to expose more dentine), an overdenture, or extraction.

What are the options for crown-lengthening?

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