RP - relines, repairs, and additions

Question 1

what is a reline?

Answer 1

adding new base material to the tissue surface of an existing denture in a quantity sufficient to fill the space which exists between the original denture contour and altered tissue contour

Question 2

what is a rebase?

Answer 2

replacing the entire denture base material of an existing denture

Question 3

what is the difference between reline and rebase?

Answer 3

reline is performed chairside
rebase is performed in the lab

Question 4

what are the types of relines?

Answer 4

temporary
soft
permanent

Question 5

what are the types of temporary relines?

Answer 5

tissue conditioning - when grossly ill fitting dentures
post immediate dentures
after implant surgery

Question 6

when may you want to use a soft reline?

Answer 6

parafunctional habits (bruxism)
very atrophic ridges
cancer/ cleft patients (obturators)

Question 7

what issue comes with a soft reline?

Answer 7

plasticiser leaches
deteriorates with time
harbours microorganisms - candida infection

Question 8

list the types of soft lining materials

Answer 8

heat cured acrylics
self cured acrylics
heat cured silicones
self cured silicones

Question 9

what are heat cured acrylic soft linings made of?

Answer 9

powder: methacrylate based (polyethyl methacrylate)
activated by benzoyl peroxide in liquid: monomer and plasticiser

Question 10

what are self cured acrylic soft linings made of?

Answer 10

powder: methacrylate based (polyethyl methacrylate)
tertiary amine acts upon benzoyl peroxide

Question 11

what are heat cured silicone soft linings made of?

Answer 11

processed against acrylic - contain siloxane material and a filler of silica

Question 12

what are permanent relines made of?

Answer 12

hard acrylic

Question 13

when are permanent relines normally used?

Answer 13

peripheral seal problems
correction of errors following inadequate master impressions
immediate/ post-immediate dentures

Question 14

how are permanent relines made?

Answer 14

heat cured

Question 15

how can you tell a fitting surface of a denture is worn?

Answer 15

glossy and shiny

Question 16

how would you take imps for a denture which as a loose fitting surface but the teeth are not worn and in good condition?

Answer 16

remove undercuts
wash impression taken using close mouth technique and light bodied material (silicone or eugenol)

Question 17

how are imps castes up for a new fitting surface?

Answer 17

impression poured in stone
overcast in plaster over occlusal surfaces of teeth (ensures teeth in the same position)

Question 18

how is a new fitting surface made on a denture?

Answer 18

imps (closed mouth)
casted with over cast
fitting surface and palate removed
cut back denture placed back into overcast
(held together by sticky wax)
palate is added in wax
flask injection method

Question 19

what are the common types of denture fractures?

Answer 19

midline
tooth detachment
loss of flange
acrylic saddle detaches from cocr baseplate
clasp fracture/ bent

Question 20

why do dentures fracture?

Answer 20

impact
acrylic in thin section
work hardening of metal
parafunctional habits
occlusion - deep overbite
soft linings
denture processing problem - porosity
bonding between tooth and base acrylic or acrylic and cocr

Question 21

how can a midline denture fracture be repaired?

Answer 21

if fractured pieces can be located together
disinfect and sent to lab
cast poured, fracture area removed, new acrylic processed

Question 22

how can a denture be repaired if a piece is missing?

Answer 22

impression taken with fractured denture in mouth
disinfected
cast poured and new acrylic processed into defect

Question 23

how may a denture be repaired if the acrylic has broken away from cocr?

Answer 23

may need to add retentive tags
solder on tags and/or use 4-META or silicoat cocr to retain acrylic

Question 24

what are temporary repair materials?

Answer 24

self-cure acrylic
cyanoacrylate glue

Question 25

what are the types of PARTIAL denture additions?

Answer 25

immediate addition
post-immediate addition
retention

Question 26

what is an immediate addition?

Answer 26

when a tooth is lost after denture construction and tooth added on the day of xLA

Question 27

what is post-immediate addition?

Answer 27

when a tooth is lost after denture construction and at a later date a tooth is added

Question 28

what is a retention addition?

Answer 28

when denture retention is inadequate a clasp is added to try and improve retention (usually wrought stainless steel clasp)