Rapid removal of rubber impression with a single firm motion results in____________________?
Correct answer: C. Minimal permanent deformation
- A. Reduced dimensional instability
- B. Improved adhesion of the impression to the tray
- C. Minimal permanent deformation
- D. Reduced contamination by saliva
Explanation
A rubber impression should be removed rapidly in one firm motion because prolonged or uneven removal increases viscous deformation. Quick removal allows the elastomer to recover more completely, producing minimal permanent deformation.
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Practise Impression Materials
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