Primary impression for complete denture Flashcards

1
Q

List the clinical and technical stages we carry out to make a denture

A
  1. Primary impressions
  2. Cast models and create special trays (Lab)
  3. Secondary impression
  4. Cast models and create record rims (Lab)
  5. Jaw registration
  6. Mount on articulator and set up teeth (LAB)
  7. Try in
  8. process to finish
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2
Q

What should a primary impression aim to record

A

The entire functional denture bearing area to ensure maximum support, retention and stability for the denture during use

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3
Q

List key features seen on an upper impression

A
  1. Hauler notch
  2. Vibrating line
  3. Fovea patinae
  4. Incisive papilla
  5. Labia frenum
  6. Palatal rugae
  7. Labial sulcus
  8. Buccal frenum
  9. Buccal sulcus
  10. Mucogingival line
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4
Q

List key features seen on lower impression

A
  1. Retromolar pad
  2. Lingual sulcus
  3. Lingual frenum
  4. Pear shaped pad
  5. Buccal sulcus
  6. Buccal shelf
  7. Labial sulcus
  8. Buccal frenum
  9. Labial frenum
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5
Q

What makes a good impression

A
  1. Tissues recorded without distortion
  2. Completed with minimal discomfort to the patient
  3. Must be over the maximum denture bearing area
  4. Should be free of significant defects
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6
Q

What makes a bad impression

A
  1. Significant voids
  2. Under extension
  3. Overextension
  4. Impression material not adhering to tray
  5. Impression that does not cover full denture bearing area
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7
Q

What things can lead to bad impression

A
  1. Incorrect tray selection
  2. Stock tray being under extended so alginate impression being too high
  3. Impression tray not being seated centrally leading to widening and narrowing of sulcus
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8
Q

What material scan we use for a primary impression

A
  1. Impression compound
  2. Alginate
  3. Silicone
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