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4th yr- CAD- Complete dentures > Complete dentures: retention and stabililty > Flashcards

Complete dentures: retention and stabililty Flashcards

1
Q

Why is treatment too edentulous patients important

A
  1. Speech
  2. Function
  3. Aesthetics
  4. Maintain alveolar bone levels
  5. Fix sunken cheeks
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2
Q

Talk though the steps required in the labs and clinics when making a complete denture

A
  1. Primary impressions
  2. Cast model and create special tray
  3. Secondary impressions
  4. Cast models and create record rims
  5. Jaw registrations
  6. Mount on articulator
  7. Try in
  8. Process to finish
  9. Fit
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3
Q

What is retention

A

The forces that stop a denture coming out

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4
Q

What is stability

A

The forces that stops the denture moving during function

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5
Q

How do we provide adequate retention to a complete denture

A
  1. Border seal
  2. Saliva
  3. Muscular forces
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6
Q

What creates the border seal on a complete denture

A

The junction between the flanges and the cheek

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7
Q

Where is there a problem creating a border seal and why

A

At the back of the mouth as there’s no flange there

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8
Q

How do we create.a border seal at the back of the mouth

A

By making a post dam

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9
Q

What is the issue if we dont have a continuous border seal around the mouth

A

Wont achieve adequate retention as air, saliva and food can get under the denture

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10
Q

Define post dam

A

A raised border along the poster extent of the upper denture

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11
Q

What is the purpose os a post dam

A

To provide an air tight seal between the denture and the palatal mucosa

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12
Q

Where does the post dam need to be positioned

A

ON the hard palate infant of the soft palate as far back in the mouth as possible (the vibrating line)

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13
Q

How do we create an effective border seal

A
  1. Non perforated tray
  2. Use green/ pink stick to compress the post dam area and record the functional width of the sulcus in the tuberosity region
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14
Q

What must we have to create an effective border seal

A

Saliva

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15
Q

Describe saliva

A

Sticky

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16
Q

Why is saliva sticky

A

Due to weak molecular forces

17
Q

What is a lack of saliva called

A

Xerostomia

18
Q

Why can patients suffer from xerostomia

A
  1. Drugs
  2. Radiotherapy
  3. Rheumatoid artirtis
  4. Sjogrens
19
Q

How can we test for xerostomia

A

Wipe gloved finger along inside of cheek

20
Q

Why are muscular forces important in retention of a complete denture

A

Keep the seal intact and push the denture into places

Tongue can be used to keep the back of the denture from dropping down

21
Q

Name some conditions that can lead to lack of muscle control

A
  1. Parkinsons
  2. Stroke
  3. Motor neurone disease
22
Q

In lower dentures which forces must be equal

A

Muscular forces from the cheek and lingual forces from the tongue
(The neutral zone)

23
Q

What is the neutral zone

A

When muscular forces from the cheek and lingual forces from the tongue are equal

24
Q

What can happen if a lower denture is not in the neutral zone

A

The tongue or the cheek will end up releasing more force which will dispose the denture

25
Q

What should we try and achieve in terms with the occlusal plane when creating a lower denture

A

Make sure occlusal plane is lower than the tongue

26
Q

How can we ensure the occlusal plane is lower Thant eh tongue

A
  1. Leave the 7s off the denture so that the tongue has more space to stabilise the lower denture
  2. Make the teeth narrower to reduce tongue cramping
27
Q

What can the lower anterior teeth be displaced by

A

If the denture is not placed over the ridge it will displace the denture by the mentalis muscle

28
Q

If a patent suffers from xerostimia or has weakened muscular forces what can we do

A

Provide accessory retention

29
Q

Give examples of accessory retention

A
  1. Springs. suction cups (outdated)
  2. Implant retained over dentures
  3. Denture fixatives
30
Q

What can implant dentures be used to do

A
  1. Maintain bone
  2. Give support
  3. Provide positive retention
31
Q

What are the benefits of implant treatment

A
  1. Higher degree of patient satisfaction
  2. Improved bite force
  3. Improved chewing ability
32
Q

What is a problem with fixatives

A

Zinc poisining

33
Q

What are some symptoms of zinc poisoning

A
  1. Nunbness
  2. Tingling of arms and legs
  3. Problems with walking and balance
34
Q

What are the benefits of fixatives

A
  1. Increased feeling of security
  2. Improve seal
  3. Improved maximum bite force
  4. Improved quality of life
35
Q

List some problems with denture instability

A
  1. Pain
  2. Looseness
  3. Inabilty to chew
  4. Speech
  5. Social/ psychological effects
36
Q

List some causes for loss of stability of complete dentures

A
  1. Premature occlusa contacts
  2. Interferences on lateral movement s
  3. Changes in the support area under the denture

4th yr- CAD- Complete dentures (3 decks)

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