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.   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?
There are many questions in the Dentaljuce pages for you to think about. This is to break up the page so you can maintain your focus and concentration, rather than viewing large blocks of text.
You do not have to fill in any questions, quizzes or MCQs to prove you have spent the time doing CPD, as the time recorder has all the details. The time you spend learning on the Dentaljuce site is the basis for your CPD certificates.
I understand. Do not show this message again.