Ecourse - Dentistry at Birmingham UK.
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This clip is from a series by Martin Baylis. After watching the clip, assess yourself by answering the following questions.
1. Why should the rim borders clear the frenal attachments?
If covered, a fraenum may cause displacement of the occlusal rim during registration.
The rim may also cause discomfort here, making it more difficult for the patient to relax their mouth during the registration.
2. What is an alternative name for the junction of hard and soft palate?
The vibrating line.
3. Is the sulcus depth on these casts likely to be correct? Explain.
If these casts are from primary stock-tray impressions, the sulcus depth is probably wrong, because a stock tray is often incorrectly extended at the borders. If they are from a correctly extended special tray secondary impression, they will be correct.
It is School Policy that occlusal registration rims are normally made on working casts produced from special tray impressions.
The first thing we've got to do when making an occlusal rim is to make the outline so we know exactly where we are going to make it to. We go to the junction of the hard and soft palate and we go down into the sulcus areas any frenum attachment must be relieved - you can't go down into that area. The teeth are cut around so they form a collet and down the front So that's the basic outline.