Retention of Complete Denture

Question 1

There are two types of retention:

Answer 1

 Primary retention
 Retention gained from the basel seat
 Secondary retention
 Improve the Retention by improve the stability and reduce the dislodging force.

Question 2

The physical means of retention involve:

Answer 2

1. Adhesion.
2. Cohesion.
3. Interfacial surface tension.
4. Atmospheric pressure.
5. Capillarity.
6. Gravity.

Question 3

1) Adhesion

Answer 3

 It is the physical force involved in the attraction between two unlike molecules. In the case of the denture, it is the attraction between the denture and saliva, and the saliva and oral mucosa.

Question 4

2) Cohesion

Answer 4

• It is the physical attraction of like molecules to each other. In other words, cohesion is the force which holds molecules of the same substance together. In complete dentures, saliva needs to be cohesive.

Question 5

Interfacial surface tension

Answer 5

 It is the tension or resistance to separation developed between two well adapted surfaces separated by a thin film of fluid. It is the force that maintains the surface continuity of liquid.

Question 6

Studies have shown that a reduction in atmospheric pressure (e.g ., at high altitudes) reduces the amount of

Answer 6

retention.

Question 7

Some of the ways of increasing surface area of the basal seat is through

Answer 7

Vestibuloplasty and ridge augmentation.

Question 8

The mechanical means of retention involve:

Answer 8

1. Undercuts.
2. Overdenture attachment.
3. Implants.
4. Mucosal inserts.
5. Rubber suction discs.
6. Rubber suction chamber.
7. Magnets Springs.

Question 9

Path of insertion :

Answer 9

the path through which the denture is fully seated on the tissue

Question 10

Path of dislodgment :

Answer 10

the path through which the denture can be dislodged during function

Question 11

Favorable undercuts can be used as

Answer 11

mechanical means of retention.

Question 12

Common undercuts in the anterior maxillary region,

Answer 12

the tuberosity and the retromylohyoid region (lingual pouch).

Question 13

There is now overwhelming evidence that a two-implant overdenture should become the

Answer 13

first choice of treatment for the edentulous mandible.

Question 14

Support is

Answer 14

that property which resists vertical movement or displacement of the dentures towards the basal seat area.