relining, rebasing

Question 1

relining

Answer 1

addition of new base material to a RPD to make up for lost contact due to resorbtion

Question 2

easiest means to evaluate space beneath the base

Answer 2

use of a thin alginate mix with a seated RPD, maintain postion until it sets

Question 3

why?

alginate mix for evaluating seating

Answer 3

thinner, use 1 scoop and two measure water
ensure minimal tissue dispalcement

Question 4

canidate for reline criteria

Answer 4

at least 2mm of alginate present beneath the base or indirect retainer lift 2mm or more

Question 5

if RPD extensions are less than ideal what should be done

Answer 5

rebase

Question 6

with an alginate impression how can you know where to reline?

Answer 6

where ever there is a bulk of impression material >2mm

Question 7

anterior indirect retainers and relining

Answer 7

can be used to assess, place seating force on distal extion and observe if retainer lifts, amount of space lifted is indicative of space beneath the base

Question 8

prep for reline impression

Answer 8

remove uniform amount of base from intaglio to create space for impression material, not apply pressure to tissues, eliminate potential contaminants, ensure suitable bonding

Question 9

impression material for reline with mobile tissue of ridge crest

Answer 9

free flowing ZOE

Question 10

impression material for reline with dense, firm, denture base tissue

Answer 10

any polysulfide rubber base, polyethers, PVS, mouth temp waxes

Question 11

most critical step of the reline impression

Answer 11

maintence of the tooth framework relation during set of material, pt not allowed to bring teeth togehter

Question 12

can reline impression defects be corrected

Answer 12

yes, mouth temp wax

Question 13

reline impression, how to check if support restored?

Answer 13

rock around fulcrum

Question 14

intraoral relines

Answer 14

inferior to lab reline, avoid
use of chemically activated resins that are porous and lack color stability

Question 15

rebasing

Answer 15

deture base removed and replaced with new resin

Question 16

rebasing results in a base of?

Answer 16

uniform quality

Question 17

how is rebasing complicated

Answer 17

retentive mesh is buried within the resin and without suffcient relief to allow adequate bulk of new resin

Question 18

rebase indication

Answer 18

not extended to cover all denute bearing areas
fractured
discolored

Question 19

rebasing technique

Answer 19

1. resin is relieved/shortened to allow room for border molding material
2. border molding completed
3. base covered with impresson material and final impression made
4. send to lab

Question 20

what must you ensure with rebase impression

Answer 20

proper tooth-framework relations

Question 21

what is often seen with rebasing, is this a flaw?

Answer 21

interface of old and new resin has a line of demarcation; estheitc flaw not structural

Question 22

what is poured against rebase impression

Answer 22

sectional cast

Question 23

when to remake RPD

Answer 23

when both the base and teeth are involved in a maintence/repair scenario

Question 24

repairing fractured RPD

Answer 24

1. lute pieces together with sticky wax
2. pour sectional matrix to preserve relation
3. place dovetails in both portions for retention
4. overbuild with chemically activated resin (compensate for shrink)
5. heated pressure pot
6. finish with bur to desired contour

1.

Question 25

posterior tooth repair

Answer 25

1. matrx fabricated to know relation
2. diatoric in ridge lap portion of tooth
3. fix tooth to matrix via sticky wax
4. 2mm of base removed at tooth site
5. tooth placed with matrix and resin used to fill in under tooth, overfill for shrinkage
6. remove excess resin, finish and polish