soft lining materials/ tissue conditioners/ functional imps

Question 1

Why use soft liner?

Answer 1

some pts find wearing dentures uncomfortable

e.g. anatomical problems - speckles of bone

Question 2

2 states of soft lining materials?

Answer 2

flow under static load but elastic under the intermittent loads produced during mastication

Question 3

2 categories?

Answer 3

PLASTICIED ACRYLIC RESINS

SILIONES

Question 4

2 types of plasticised acrylic resins?

Answer 4

heat or chemically cured

Question 5

difference between PMMA and plasticised acrylic resins?

Answer 5

these materials liquid contains a large amount of plasticiser

plasticiser limits the degree of tangling of the polymer chains

Question 6

why can plasticised acrylic resin soft liners change shape quickly?

Answer 6

little cross-linking of the polymer chains

Question 7

problems of plasticised acrylic resins?

Answer 7

plasticiser tends to slowly leach out so lining becomes harder over time

potential for tissue reaction to the soft liner

finite lifespan

Question 8

disadvantages of silicone?

Answer 8

generally do not bond to the denture bases so require some form of adhesive to achieve success - likey debodn with time