ORE Part 2 · Dental Manikin (DM) guide
Temporary Crown
In the temporary crown exercise you make a temporary crown for a pre-prepared tooth, using the putty index provided and temporary crown and bridge material. It has to seat fully, meet the margin without a gap or excess, keep the contacts and contour of the tooth, and be smooth. A void or a broken margin is common when the crown comes out, so expect to repair one.
What examiners look for
- A crown that seats fully and fits the prepared tooth, neither loose nor too tight
- Margins that meet the preparation without a gap and don't extend onto the gingiva
- All excess removed, including from under the gingiva and the interdental areas
- Contacts with the adjacent teeth kept, with no interproximal overhangs
- An occlusal surface that follows the contours of the original tooth, with no high spots
- A smooth, even surface with no voids
Common mistakes
- Forgetting the separating medium on the prepared and adjacent teeth
- Trapping air when loading the index
- Removing the index before the material has set
- Levering the crown off by its margins, which can fracture them
- Trimming into the contact areas or the margin while removing flash
- Leaving excess material hidden in the interdental areas
Candidate questions
What if the crown comes out with a void or a broken margin?
It's common, and you may be expected to repair it. The course shows the repair step by step, including how to keep the repair material off the tooth.
How do I avoid air bubbles?
Keep the dispensing tip in the material while you fill the index over the prepared tooth, and fill it in one go without lifting the tip.
Should the finished crown stay on the tooth?
Follow the examiners' instructions. They often ask for the finished crown to be left out of the mouth, so it can't be lost in the manikin head.