Enhanced Verifiable CPD from the
University of Birmingham

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

Here's a representation of the preparation:

1
Dentine prepared to receive ferrule
2
Space prepared for post
3
Post and core fitted
4
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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