Retention And Stability

Question 1

What is stability?

Answer 1

Quality of a denture to resist displacement from functionally directed forces. Quality of a denture to be firm, steady and not subject to change of position when forces are applied. Subjective assessment

Question 2

What is retention?

Answer 2

Resistance of a denture to displacement from denture bearing areas in a vertical direction
Depends on acquired muscular control, physical forces of retention - adhesion and cohesion of saliva, peripheral border seal, area of DBA area, accuracy of fit

Question 3

What is support?

Answer 3

Quality of a denture to resist displacement from occlusally directed forces. Determined by good bony support with well formed ridges.

Question 4

What are displacing forces?

Answer 4

Muscles surrounding oral cavity
Tongue
Sticky and viscous foods
Occlusal interferences

Question 5

What is the average upper DBA?

Answer 5

24 cm squared

Question 6

What is the average lower DBA?

Answer 6

14cm squared