Relining, Rebasing, and Repairing Flashcards
(31 cards)
what is relining
adding new denture base material to the existing resin to make up for loss of tissue contact caused by resorption of the alveolar ridge
what is the easiest way to evaluate the space under the denture base
to place a thin mix of alginate in the denture base area, seat the RPD and maintain its position until set
how should the alginate be mixed to evaluate the intaglio surface of the RPD
mix with increased water-powder ratio to ensure minimal tissue displacement
- 1 scoop alginate powder mixed with 2 measures of hot water
when would the patient be considered a candidate for a reline or rebase
if at least 2 mm of alginate is present under the denture base or if the indirect retainer lifts 2mm or more
when would a rebase be considered instead of a reline
if the existing denture is short of ideal coverage
how could you evaluate support on distal extension of RPD
apply a seating force on the most posterior aspect of the denture base and observing an interior indirect retainer
if there is significant loss of support, the indirect retainer will:
lift from its rest seat
what is an indicator of the amount of space to be found under the denture base
the amount of space under the indirect retainer
a resin denture base is prepared for a reline impression by:
removing a uniform amount of denture resin from the intaglio surface of the denture base
the resin from the intaglio surface of the denture base should be removed for 2 important reasons
- space must be created so the impression material will not apply undue pressure to the underlying soft tissues
- the surface of the existing resin must be removed to eliminate potential contaminants and ensure a suitable bonding
what impression material should be used for relining in the case of mobile tissue on the crest of the ridge
a free flowing, zinc oxide eugenol impression material
what impression material should be used for a reline in the case of dense, firm denture base tissue
use any of the polysulfide rubber bases, polyethers, polyvinylsiloxanes and mouth temperature waxes
can tissue conditioning materials be used for relining? describe them
they can be although they offer no particular advantage and can easily distort the associated soft tissues
what is the most critical step in the reline procedure
the maintenance of the tooth framework relationship during the set of the impression material
should the patient be allowed to bring the teeth into contact during the impression making procedure
no - dentist must hold framework
what can small defects in the impression be corrected with
the mouth temperature wax
what should the dentist do to ensure that the desired support of the denture has been restored
rock the framework around its fulcrum
how should the mouth temperate wax be used
a small brush used to add it on then impression is returned to the mouth for 12 mintues
how does the lab reline the denture
- the prosthesis to be relined is located in one part of the flask while the replica of the edentulous ridge is found in the remaining part of the flask
intraoral relines are ______ to laboratory relines
inferior
why are chemically activated resins not to be used for an intraoral reline
they are poroud and will lack color stability
what is rebasing
a laboratory technique in which the bulk of the denture base is removed and replaced using new resin
rebasing results in a base of _____
uniform quality
why is rebasing technically complicated
the retentive meshwork is buried within the denture base often without sufficient relief beneath the mesh to allow for adequate bulk of new resin
