5 - Retention and stability of complete dentures Flashcards

1
Q

Define retention.

A

Resistance of denture to vertical movement away from tissues

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2
Q

Define stability.

A

Resistance of denture to lateral displacement (by functional forces)

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3
Q

Define adhesion.

A
  • physical attraction of unlike molecules for each other (saliva and mucous membrane/saliva and denture base)
  • “suction”
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4
Q

How does adhesion affect denture design?

A
  • more important in the maxillary than the mandibular
  • extension over denture bearing area
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5
Q

Define cohesion.

A

Physical attraction between similar molecules (salivary molecules)

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6
Q

What is the role of saliva in denture wearing?

A
  • buffering
  • cleaning (antimicrobial)
  • adhesion and cohesion
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7
Q

How does atmospheric pressure affect denture design?

A

Border seal ensures good “suction”

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8
Q

Describe a post dam seal.

A
  • bevelled edge at the beginning of the soft palate
  • only in maxillary denture
  • ensure fovea palatine are not covered
  • 0.5mm is typical depth
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9
Q

Describe adequate extension of a lower denture.

A
  • base extends over retromolar pads
  • should extend into lingual pouch (where you can palpate the vertical part of the mandible)
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10
Q

Where are soft tissue undercuts common?

A
  • anterior 4-4 maxillary region
  • uncommon in lower
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11
Q

List factors that can make retention difficult.

A
  • atrophic ridges (down to basal bone)
  • incomplete palate (cleft palate or cancer patients)
  • fibrous ridges
  • damaged alveolar ridges (soft tissue graft)
  • gagging patients
  • insufficient saliva
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12
Q

How should teeth be positioned?

A
  • teeth in neutral zone
  • over ridge in mandible
  • slightly buccal in maxilla
  • narrower teeth are better
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13
Q

How does the tongue affect denture wearing?

A

Teeth that are placed too lingually cause the denture to lift

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