RMTL 4 - Maintenance, relines, rebases

Question 1

What is the resorption like if there is extensive perio pre-XLA?

Answer 1

Normally have less resorption

Question 2

If there is rapid initially remodelling post XLA what chair side temporary relines are appropriate?

Answer 2

Permanent reline material - ufi gel

Temp soft lining material (2-3 weeks)

Question 3

What is the regular recall for edentate patients? and why would it be shorter?

Answer 3

2 years

6-12 months for high oral cancer risk

Question 4

What is the difference between a reline and rebase?

Answer 4

Reline = adding more acrylic on to fitting surface 
Rebase = replacement of fitting surface and base acrylic

Question 5

What type of soft lining materials are there?

Answer 5

Soft polymers on to fitting surface
Temporary
Permanent

Question 6

What is the purpose of soft polymers being added to denture fitting surface?

Answer 6

Reduce masticatory load on underlying STs

Allow recovery of traumatised mucosa before construction of new denture

Question 7

What is the difference between temporary reline and tissue conditioning?

Answer 7

Temporary reline = 2-3weeks max

Tissue conditioning = 1 week max as becomes hard/brittle

Question 8

What is a functional impression?

Answer 8

Using temporary soft lining takes an impression over the course of 1 week

Question 9

What is a neutral zone impression?

Answer 9

Place soft lining material on to neutral zone and get the patient to do some functional loading

Question 10

What are the wanted properties of a temporary soft lining material?

Answer 10

Biocompatibility
Soft
Adaption to changing tissue shapes

Question 11

What is a temporary soft liner material made up of?

Answer 11

Powder –> Polymer (co-polymer) of methyl, ethyl or butyl methacrylate
Liquid –> ETHYL ALCOHOL AND PLASTICISING
AROMATIC ESTERS (limits timespan for which it will adapt – eventually leach out = material fully set)

Question 12

Name an example of a tissue conditioner.

Answer 12

Coe comfort and Viscogel

Question 13

Name an example of a soft liner.

Answer 13

Coe soft and GC SoftLiner

Question 14

When would a temporary soft liner or tissue conditioner be indicated?

Answer 14

• Persistent soreness beneath dentures
• Aid to retention = AS MORE FLEXIBLE THAN CONVENTIONAL ACRYLIC CAN LOCK INTO UNDERCUTS ADDING RETENTION
• Post radiotherapy dentures

Question 15

What are the 4 groups of permanent soft liners?

Answer 15

Silicone based
Heat cured acrylic based
Heat cured fluoroelastomer
Light cured acrylic

Question 16

What are the 3 types of silicone based permanent soft liners?

Answer 16

• Lab cold cured = flexibase; simpa
• Heat cured = MOLLOPLAST-B (GO TO SOFT LINER NORMALLY)/ per-fit
• Chair-side = ufi-gel (soft)

Question 17

What are the 2 types of heat cured acrylic based permanent soft liners?

Answer 17

• Leachable plasticiser – coe super soft; palasiv 62 = leach at much slower rate than the temporary soft liners
• Polymerisable plasticiser – softic 49

Question 18

Why would a light cured acrylic permanent soft liner not be used?

Answer 18

e.g. lightline

May not adhere to the denture base well

Question 19

Out of 1.silicone based and 2.acrylic based permanent soft liners, which has poor and acceptable survival?

Answer 19

1. Acceptable

2. Poor

Question 20

What is the recommended thickness of permanent soft liners?

Answer 20

2mm

Question 21

What cleaning is contraindicated when a denture has a permanent soft liner?

Answer 21

Steradent and hypochlorite