5 - Prosthetic Tooth Materials & Linings Flashcards Preview

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Flashcards in 5 - Prosthetic Tooth Materials & Linings Deck (19):
1

artificial teeth:
based on which material?
how does it develop resistance to crazing?
how is it connected to denture base resin?

- acrylic
- highly cross linked
- by a chemical bond

2

acrylic based artificial teeth: name one advantage and disadvantage?

- easy to modify

- susceptible to wear

3

materials for artificial teeth - porcelain based:
- how common?
- how is it attached to denture base resin?
- susceptible to?
- how easy to adjust?

- rarely used
- mechanically attached
- cracks around area of attachment
- difficult to adjust

4

other materials used for artificial teeth?
examples where it is used?
advantage?

- composite resin based
- combination of materials

- used in dental implants
- less susceptible to wear

5

permanent soft lining materials: clinical uses?

- atrophic ridge and mucosa (soft lining gives cushioning as ridge takes more force)
- undercut ridges (flexible flange)
- obturators (flexible bung)

6

acrylic soft linings: 2 types?

heat cured
self cured

7

heat cured acrylic soft lining: components?

- polyethylmethacrylate (polyme)
- butyl methacrylate
- butyl-phthalybutyl glycolate (plasticiser)

8

advantages of acrylic soft lining materials?
disadvantage?

- good bonding between denture base and lining material
- material hardens over time because plasticiser leaches out

9

silicone soft lining materials: 2 types?

heat cured
self cured

10

silicone soft lining materials

- polydimethysiloxane (vinyl end groups)
- bonding agent required

11

advantages of silicone based materials?
disadvantages?

- maintains softness

- failure of acrylic/silicone bond
- rough surface, difficult to modify
- lining material takes up stain
- susceptible to candida colonisation
- risk of denture fracture

12

lab technique for acrylic/soft lining denture - how many stages?

two stage technique; acrylic curing first

13

lab technique for acrylic/soft lining denture - spacer constructed for?

to prevent acrylic reaching area where soft lining will be placed

14

lab technique for acrylic/soft lining denture: steps?

1. acrylic packed, flask closed, allowed to partially cure
2. spacer removed from model
3. adhesive applied to acrylic, molloplast packed

15

permanent soft lining materials & cleaning dentures
- aggressive brushing will cause?
- if cleansers is used too hot what will happen?

- will cause disturbance in bond between acrylic and lining
- changes in surface roughness and colour

16

temporary soft lining materials: components and its constituents?
what happens during setting? what properties does it have?

- powder: polyethyl methacrylate
- liquid: ethanol, plasticiser (flexibility)

- setting is formation of a gel, which has viscoelastic properties

17

clinical uses of temporary soft lining materials?

- temporary relines (for dentures undergoing modification, transition phase after implant placement)
- tissue conditioner (used in ill fitting dentures to allow recovery of inflamed tissues in denture bearing area)
- functional impressions (rebasing denture, modify fitting surface of obturator, recording neutral zone)

18

functional impression for rebasing: steps?

- use coe-comfort in denture base
- pt wears denture for few fats
- records impression of tissues during function
- used for rebase impression

19

temporary soft lining materials and cleaning dentures:
- brushing lining will cause?
- what happens if cleanser used is too hot?

- deterioration
- changes in surface roughness and colour