Principles of Complete dentures

Question 1

4 objectives of complete dentures

Answer 1

1. To provide adequate masticatory function
2. To restore natural appearance
3. To restore normal speech
4. Comfort and preservation of supporting structures

Question 2

2 component parts of complete dentures

Answer 2

• Denture base, flange and border
• Teeth

Question 3

3 dentures surfaces

Answer 3

• Fitting surface
• Polished surface
• Occlusal surface

Question 4

3 factors affecting the success of complete dentures

Answer 4

psychological comfort - retention

physiologic comfort - stability

support - longevity

Question 5

retention of complete denture

Answer 5

• Resistance to displacement of the denture base away from the ridge
• The quality inherent in a denture that resists the forces of gravity, the adhesiveness of foods and the forces associated with opening the mouth

Question 6

4 groups of factors affecting retention of complete dentures

Answer 6

1. physical
2. anatomical
3. aatomospheric pressiore
4. gravity

Question 7

4 physical facors affecting retention of complete dentures

Answer 7

• adhesion
• cohesion
• atmospheric pressiore
• gravity

Question 8

adhesion

Answer 8

forces of attraction existing between dissimilar in bodies in close contact (attraction between saliva and denture base)

Question 9

cohesion

Answer 9

forces of attraction existing between similar bodies in close contact (surface tension of saliva)

Question 10

atmospheric pressure

Answer 10

physical factor of hydrostatic pressure due to weight of the atmsphere on the earth’s surface

Question 11

3 anatomical factrs affecting

Answer 11

shape of edentulous area

undercuts

anatomy of border tissues

Question 12

4 mechanical factors affecting retention of complete dentures

Answer 12

• balanced occlusion
• contour of polished surface
• position of occlusal plane
• position of teeth in respect to ridge

Question 13

balanced occlusion impact on retention of complete denture

Answer 13

The bilateral simultaneous, anterior and posterior occlusal contact in centric and eccentric position

Question 14

contour of polished surface impact on complete denture retention

Answer 14

Teeth and polished surface should be contoured and harmonious with oral structure

Question 15

position of the occlusal plane impact on complete denture retention

Answer 15

Occlusal plane of lower denture must be in correct level i.e. corner of mouth provides the anterior landmark

Question 16

position of teeth in respect to ridge impact on retention of complete dentures

Answer 16

Lower posterior teeth are positioned directly above the lower residual alveolar ridge, and within the neutral zone

Question 17

denture stability

Answer 17

The quality of the denture to be firm, steady and constant in position when forces are applied to it (especially to resistance against horizontal or rotatory movements)