Orient
Identify the recorded arch and negative tooth surfaces.
MEDIVEERSETHE PRACTICAL HUBOBSERVE / REASON / EXPLAIN
Alginate impression assessment
Assess a recorded impression for its intended prosthodontic task and explain visible limitations.
REFERENCE GALLERY1 / 1 reference
1
Recorded tooth surface
A negative reproduction of a tooth surface in the impression.
Zoom in, then drag to inspect. Keyboard: + / − to zoom, arrows to pan, 0 to reset. Tap the numbered markers to explore parts.
Alginate impression — reference specimen
Image: ANUG · Source / original · CC BY-SA 3.0Resized and converted to WebP; original colours retained.
Recognise and interpret
An irreversible hydrocolloid sets through a chemical reaction; handling and storage affect dimensional accuracy.
- Recorded tooth surface
- Bulk material
- Peripheral border
Inspect
Look for tears, voids, incomplete coverage and tray separation.
Handle
Use the manufacturer’s time and storage guidance before cast production.
At the viva table
Try answering aloud, then open the suggested answer. Examiner questions vary.
01 / Is an impression a positive or negative reproduction?
A negative reproduction.
02 / Is alginate reversible by heating?
No. Dental alginate is an irreversible hydrocolloid.
03 / Why inspect before pouring?
Defects may transfer to the cast and affect later work.
04 / Can every distorted impression be corrected by trimming the cast?
No. A new accurate record may be required.