Complete dentures - duplication and function and stability

Question 1

What are the 3 surfaces need to consider for denture stability?

Answer 1

Occlusal
polished
fitting

Question 2

What is denture stability?

Answer 2

ability to resist those forces attempting to displace it in directions other than that right angles to supporting tissues

Question 3

What is the stability affected by?

Answer 3

Size and shape of the residual alveolar ridge

Question 4

What needs to be optimised to have good stability?

Answer 4

Periphery
Occlusal surface
Polished surface

Question 5

What are the problems can be faced in the upper ridge

Answer 5

Atrophic fibrous ridge
Torus palatinus
Bulbous ridge

Question 6

How do you optimise the periphery to get good stability?

Answer 6

Avoid encroachment into muscle insertions: mylohyoid, buccinator genioglossus and mentalis

Question 7

What must you achieve with the occlusal surface?

Answer 7

Balanced occlusion - even bilateral contact between opposing surfaces in RCP - static relationship
Balanced articulation - even and mutual stability in all lateral and protrusive movements - a dynamic relationship

Question 8

What do you want the polished surface to be like?

Answer 8

concave polished surface - will enable the musculature to stabilise the dentures
Removal of undercut on the lingual to prevent lingual displacement

Question 9

What is the neutral zone?

Answer 9

Site where the opposing surfaces exerted by the lips and cheeks and the tongue are in balance

Question 10

where do you need to achieve the neutral zone in the mouth

Answer 10

Mandibular anterior region - lower lip

Mandibular posterior sextants - tongue cramp

Question 11

what is the neutral zone technique?

Answer 11

1. request a heat-cured base after definitive imps for registration
2. set registration rims in even contact
3. remove most of the wax from the anterior region
4. apply adhesive to the cut surface and replace the missing wax with stiff alginate
5. place in mouth
6. patient to touch the palatal surface of the upper anterior rim with the tip of the tongue, occlude, smile and relax
7. similar procedure can be carried out in the posterior region

Question 12

What is a pre-contact record for?

Answer 12

To ensure occlusal balance
To remove discrepancies that occur as a result of errors during the recording of the jaw relations and the processing of the denture
It is a method for re-registering conicidence of RCP and ICP

Question 13

How do you prevent pre-contact between occlusal surface?

Answer 13

stop just before in full ICP

Send to technician where gets ground in

Question 14

What is the clincical technique for complete dentures opposed by natural teeth?

Answer 14

1. impression as normal
2. registration - be aware the upper anterior of the completed denture will overlap the lower natural teeth, need support posteriorly
3. Wax try-in - as normal
4. placement ensure that a check record is carried out and that balance is acheived between the natural teeth and the denture in occlusion and in lateral excursions

Question 15

When would you do that simple duplication technique?

Answer 15

To shorten the denture making process as already have a record of all the measurements that have worked well for the patient

Question 16

When would you use the complex duplication technique

Answer 16

when replacement must copy the original to greater or lesser extent

• elderly
• when tolerance is compromised
• when a duplicate denture is needed (have spare)

Question 17

What is the simple duplication technique?

Answer 17

A cast model taken from the current denture; model formed on denture using silicone putty
Can be used to provide model on which special trays are made
use alma gauge to form reg rims

Question 18

What is the complex duplication technique?

Answer 18

1. make a negative of the dentures in an alginate flask
2. template in wax and acrylic (technical stage 1)
3. make any adjustments to the face height (clinical stage 2)
4. remove any wax teeth and replace with acrylic teeth by the chosen acrylic teeth
5. try-in and reline impressions (clinical stage 3)
6. Process and finish (technical stage 2)
7. Placement and check record (clinical stage 4)