CD- Function and Stability

Question 1

What is denture stability?

Answer 1

Ability to resist forces attempting to displace the denture in directions, other than right angles to the supporting tissues

Question 2

What factors must you consider for stability?

Answer 2

Size and shape of residual ridges
Occlusal loads
Tissue compressibility
Premature contacts - tipping

Question 3

What problems can affect denture stability?

Answer 3

Atrophic fibrous ridge - cause movement
Torus palatinus
Bulbous ridges - cause undercut

Question 4

What type of material should be used for fibrous tissue

Answer 4

Mucostatic

Mucocompressive for rest

Question 5

What should be considered when thinking about periphery of denture and stability?

Answer 5

Avoid encroachment onto muscle insertion - functional moulding with impressions
Overextension- hit muscle = displacement
Concave surface - muscle can help hold denture

Question 6

What should be considered when thinking about occlusal surface and stability?

Answer 6

Balanced occlusion - even bilateral contacts between opposing surfaces
Balanced articulation - even and stable in lateral and protrusive movements

Question 7

What should be considered when thinking about polished surface and stability?

Answer 7

Concave surfaces - enable musculature to stabilise denture

Removal lingual undercut to prevent lingual displacement

Question 8

What is neutral zone?

Answer 8

Site where opposing surfaces exerted by lips, cheek and tongue are balanced

Question 9

What technique should be used for neutral zone?

Answer 9

1. Request heat-cured base after definitive imps for reg
2. Set registration rims in even contact
3. Remove most wax anterior region
4. Apply adhesive to cut surface and replace missing wax with stiff aliginate
5. Place in mouth
6. Pt touch palatal surface upper anterior rim w/ tip tongue, occlude, smile and relax
7. Repeated in posterior region

Question 10

Why do pre-contact check record?

Answer 10

Ensure occlusal balance

Remove any discrepancies that occur as result of recording jaw relationship

Question 11

What is the clinic technique when complete dentures are opposed by natural teeth?

Answer 11

1. Impression
2. Registration - be aware support is often needed posterior
3. Wax try-in as normal
4. Placement - ensure check record carried out and balance achieve between natural and denture in occlusion and lateral excursion