Relining, Rebasing, and Repairing

Question 1

the most basic of the RPD maintenance techniques

Answer 1

relining

Question 2

relining

Answer 2

adding new denture base material to the existing resin to makeup for loss of tissue contact caused by resorption of the alveolar ridge

Question 3

easiest means of evaluating the space under the dentures base is to place a

Answer 3

thin mix of alginate in the denture base area, set the RPD in the mouth and maintain its position until the alginate sets

Question 4

the alginate must be mixed with an increased W/P ratio to ensure

Answer 4

minimal tissue displacement.
1 scoop of powder mixed with 2 measures of hot water will provide a mix that is thin enough to not displace soft tissues and set quickly

Question 5

the alginate separates (2) from the RPD after the eval is made

Answer 5

easily and cleanly

Question 6

relining
at least – mm of alginate is present under the denture base or if the indirect retainer lifts – m of more, the pt can be considered a candidate for a reline or rebase

Answer 6

2
2

Question 7

if the existing denture is short of ideal coverage,

Answer 7

a rebase should be used instead of a reline

Question 8

a thin mix of alginate impression material may be used to evaluate the

Answer 8

fit of a denture base to the underlying soft tissues

Question 9

in this instance, there is a bulk of alginate impression material at the

Answer 9

buccal shelf area and at the crest of the ridge

a reline is indicated

Question 10

it is also possible to evaluate the loss of support on distal extension RPD by apply a

Answer 10

seating force on the most posterior aspect of the denture base and observing an interior indirect retainer

Question 11

if sig changes have occurred, the IR will

Answer 11

lift from its rest seat

Question 12

the amount of space under the IR is an indicator of the

Answer 12

amount of space to be found under the denture base

Question 13

in a passive state, the IR on the — surface of the mand left first premolar is completely seated

Answer 13

mesial

Question 14

when pressure is applied to the distal extension base, the IR on the mand left first molar is

Answer 14

unseated

may indicate reline

Question 15

a resin denture bae is prepared for a reline impression by

Answer 15

removing a uniform amt of denture resin from the intaglio surface of the denture base

Question 16

the resin should be removed for 2 important reasons

Answer 16

-space must be created so the impression material will not apply undue pressure o the underlying soft tissues
-the surface of the existing resin must be removed to eliminate potential contaminants and ensure a suitable bonding

Question 17

the choice of impression material depends on the characteristics of the tissues to be impression
in the case of mobile tissue on the crest of the ridge use-
in the case of dense, firm denture base tissue use-

Answer 17

free flowing, zinc oxide eugenol impression material

any of the polysulfide rubber bases, polyethers, polyvinylsiloxanes, and mouth temperature waxes

Question 18

tissue conditioning materials also be used as

Answer 18

impression materials

although they offer no particular advantage and can easily distort the associated soft tissues

Question 19

the most critical step in the reline procedure is

Answer 19

the maintenance of the tooth framework relationship during the set of the impression material

Question 20

the pt should not be allowed to bring the

Answer 20

teeth into contact during the impression making procedure

Question 21

the dentist must hold the framework against the

Answer 21

abutments until the impression material is to be removed from the mouth

Question 22

small defects in the impression can usually be corrected with

Answer 22

mouth temperature wax

at this time the practitioner should attempt to rock the framework around its fulcrum to ensure that the desired support has been restored

Question 23

a small brush is used to add mouth temperature wax to correct an impression. the impression is then returned to the mouth for a period of

Answer 23

12 min

Question 24

the completed partial denture reline impression is presented to the

Answer 24

lab for processing

Question 25

the prosthesis to be relined is located in one part of the flask, while the replica of the edentulous ridge is found in the

Answer 25

remaining part of the flask

Question 26

---- are inferior to lab relines

Answer 26

intraoral relines

Question 27

there are chimcally activated resins that are intending to be used for the

Answer 27

intraoral reline they are porus and will lack color stability

Question 28

this procedure is quick and will provide

Answer 28

an improved relaitonship between the denture base and the soft tissues

Question 29

rebasing

Answer 29

lab technique in which the bulk of the denture base is removed and replaced using new resin

Question 30

the approach results in a base of uniform quality but is technically complicated by the fact that

Answer 30

the retentive meshwork is buried within the denture base often without sufficent relief beneath the mesh to allow for adequate bulk of new resin

Question 31

indications of a rebase (3)

Answer 31

-denture bases do not extend to cover all of the denture bearing tissues -denture base has fractured or -denture base has become irreparably discolored

Question 32

rebasing the denture resin is (2) to allow room for preadaptation of the borders with modeling plastic (compound)

Answer 32

relieved and shorted

Question 33

when the border molding is complete, the base is covered with a

Answer 33

suitable impression material and the final impression is made

Question 34

after processing, the interface of new and old resin often present a line of

Answer 34

demarcation this is more an esthetic irritant than a structural flaw

Question 35

the distal extension base has been relieved almost to the resin retaining elements the borders have been established using

Answer 35

modeling plastic

Question 36

desired contours are reestablished using

Answer 36

baseplate wax

Question 37

remake

Answer 37

when both the denture base and the denture teeth are involved in a maintenance or repair situation, the partial denture may need to be tripped of both teeth and denture base and remade

Question 38

repairs

Answer 38

the pieces of the denture base are positively related and luted tg using sticky wax a matrix is poured using dental stone. the matrix preserves the relationship of the denture base fragments the fracture line is opened using lab bur in a dental lab engine, and dovetails are prepared to provide mech retention chemically activated resin is added to the prepared fracture line. the resin is slightly overbuilt to compensate for polymerization shrinkage the assembly is placed in a heated pressure pot to complete the polymerization cycle excess repair resin is removed using appropriate rotary instrumentation and the denture base is finished and polished

Question 39

repairs displacement of one or more posterior teeth sometimes occurs:

Answer 39

if possible the displaced tooth is repositioned in the denture base a matrix is fabricated using rigid PVS registration medium. accelerated dental stone also may used diatorics are prepped in the ridge lab portion of the tooth to provide mechanical retention and the denture tooth is affixed to the matrix using sticky wax the denture base is relieved to permit the placement of at least 2 mm of repair resin beneath the prosthetic tooth. in turn, the occlusal matrix and denture tooth are repositioned on the prothesis chemically activated repair resin is placed into the prepped space using a small brush. the resin is slightly overbuilt to account for poly shrinkage after completion of the poly cycle in a heated pressure pot, excess resin is removed from the denture base using a bur finished and polished