Flashcards in Dr Moretzky, religning and rebasing denture Deck (34):
Define relining in dentures
resurfaceing the tissue side of the denture. This is done by adding new base material to the existing denture
when is relining apropriate?
when there is space between the denture and the oral tissue.
Define rebaseing in dentures
replacing entire denture base, This is done by flasking and heat cured acrylic
what is pivoting and how do you fix it?
a bony structure is more elevated than others and the denture sits on it. Use PIP paste ( pressure indicating paste) to determine where the pivots are
what are occlusal interferences and how are they fixed?
anything on the occlussal surface that prevents good occlusion. Use articulating paper.
inadequate posterior palatal seal
cause looseness from side to side movements. PIP paste works for this as well.
cause loosenss. This is determined by pulling on the patients cheeks, lips and have them move their tongue.
Tight pterygomandibular raphe
also dosne allow the denture to be stable.
what does relining solve?
retention problems related to the denture base
name the 5 types of relines
processed/chairside, impression/ functional technique, hard acrylic, permanent/ temporary, complete or partial dentures.
during a processed acrylic complete reline, which impression is made first?
the least stable denture. This is cause is easier to stableize the some what stable other denture
the impression technique is difficult to reline without what?
encroaching on interocclusasal space, displacing supporting tissue, altering occlusal contacts
before you take the impression what do you do?
adjust occlusion and clean the denture, cut flanges 2 mm and border mold, then reduce tissue base
after loading the denture with impression material, how do you place the denture?
place it anteriorly to posterioly
after all this what do you do?
check intra oral relationships and send to lab for same day processing if possible.
what are some advantages to the reline impression technique?
only 2 apts needed, tissues are captured at rest ( less possible distortion), greater extension of peripheries, allows placement of functional posterior palatal seal
disadvantages to impression technique for relining
possible alteration of VDO, occlusion, facial support, . No chance to test retention under function.
It needs to be thick for to be accurate. The denture usually needs to be reduced to allow for thickness.
how do you mix the materials for functional relines?
10ml powder: 2 ml liquid, mix 30 sec.
material used in functional relines
how is the lynal placed in functional relines?
intraorally, During setting which is 8 min. let them talk, swallow, and lightly occlude.
After setting, how do you remove excess from the denture ?
with a hot scalpal
what are advangates to functional impression?
functionally molds peripheries, you can asses the patients comfor and retention prior to reline proper
disadvantages to functional impressions
variability of materials and handling them, over extentions may occur which can irritate patients when converted to acrylic resin
when rebasing, what are you objectives?
reestablish correct relation of denture to basal tissue, restore maxillomandibular relationship, restore stability and retention.
what techniques are used for rebasing?
either the static impression technique, or the functional impression technique
tissue preparation for rebasing
patient should leave dentures out at least 8 hours a day. Denture should not be worn 2-3 days before FINAL impression. Patients should massage tissue 2-3 times a day to stimulate blood supply.
using tissue conditioner in rebasing
Is used when tissue is abused and dentures cant be left out for recovery.
what does the conditioners do?
it equalizes the masticatory forces which eliminates pressure spots.
how often are conditioners renewed?
every 3-7 days, once tissue is healthy they are scheduled for final impression.
what are compound stops?
placed on impression surface of denture to re establish proper VD or improve occlusal plane orientation if needed.
after placing conditioning material on the denture what is done?
patients mandible is in retruded position to stabilize the denture while setting.