COMPLETE DENTURES - FUNCTION & STABILITY

Question 1

3 surfaces in denture stability

Answer 1

occlusal
polished
fitting

Question 2

what is denture secturity a combo of

Answer 2

retention

stability

Question 3

what is retention

Answer 3

ability of a denture to resist displacement in an axial direction (ie away from denture bearing tissues)

Question 4

how is retention achieved in complete /partial dentures

Answer 4

complete
- cohesion between denture oral muscosa
peripheral seal at denture border
SA of denture bearing area

partial
- tooth undercut
cohesion between denture oral musocsa

Question 5

compromising complete denture retention

Answer 5

poor denture adaptation to underlying tissues
unfavourable supporting anatomy eg fibrous ridges
dry mouth (lack of cohesive seal)
ingress of air (lack of posterior seal)

Question 6

denture stability definition

Answer 6

ability to resist forces attempting to displace the denture in directions other than right angles to supporting tissues
ie lateral and antero posterior movements

Question 7

complicating factors in denture stability and why

Answer 7

• lower atrophic ridges
  no barreri to prevent lateral mv of denture
• fibrous ridges (reduced distnace to lateral forces due to reduced bone)
  -torus palatinous (affects where post damn placed, anterior reduced denture strength and SA, posterior leads to bulky denture affecting speech and tolerance)
• bulbous ridges (multiple undercut areas, may lead to - flangeless anterior regions therefore reducing strength and air seal)

Question 8

how to optimise denture stability

Answer 8

peripheral border
occlusal surface - balanced occlusion and articulation (even and mutual stability in excursive movements)
polished surface (allow musculature to stabilise the dentures)

Question 9

denture stability peripheral border

Answer 9

avoid encroachment onto muscle insertions (mylohyoid, buccinator, genioglossus, metalis)

Question 10

why are denture adhesives needed

Answer 10

looseness can cause distress

can improve retention\

Question 11

pts who benefit from denture ahesives

Answer 11

pts new to dentures to help with muscle skills and aid adaptatio
pts with dry mouth or resorbed ridges

Question 12

how do denture adhesives work

Answer 12

adsorbing moisture to obliterate the space between denture and mucosa (thinner = better)

Question 13

adhesive strips

Answer 13

acts as temp reline

acts as a sticky cushion

Question 14

harmful effects of denture adhesives

Answer 14

ingestion - long term may result in hypocypreamia (leads to paraesthesia and muscle weakness)
due to zinc

Question 15

instructions for use of denture adhesives

Answer 15

denture clean and dry
hold in place for 10 sec
wipe excess
dont eat or drink for 5 mins
remove at night and clean