Tissue Conditioner and Resin Base and Relines Flashcards
what is the powdered polymer for tissue conditioner made of
polyethyl methacrylate or isobutyl methacrylate
what is the liquid in tissue conditioner made of
an ester (butyl phthalate or butyl glycolate) in an alcohol solvent
what are tissue conditioners used for
lining the intaglio surface of a denture with a tissue conditioner improves retenetion and stability and relieves pressure
- allows abused tissues to recover
how are tissue conditioners used
polymer and monomer are mixed to make a gel then placed in denture -> insert for 5 minutes
describe tissue conditioners
- self curing and slowly polymerizing
- versatile and easy to use
what do tissue conditioners treat
- chronic denture soreness
- traumatized oral mucosa
- remodeling ridges
the sponginess of the tissue conditioner material absorbs:
loads to the underlying residual ridge and allows the tissues to heal during function
when does loss of resiliency occur with tissue conditioners
as the plasticizer leaches out and resin becomes stiff
how often should tissue conditioner be renewed
once or twice per week
what happens when the tissue conditioner is not renewed
the resin becomes stiff and produces the same tissue abuse that it was placed to treat
what are the uses of tissue conditioners
- prevent or treat chronic denture soreness
- stabilize temporary record bases
- stabilize immediate dentures during healing
- final impressions material for functional impressions
what are resilient liners and what are they used for
- a group of elastomer polymers
- used in a denture when a protective resilient surface is needed on the intaglio surface: sensitive mucosa, postradiation mucositis, poor supporting tissue, xerostomia patients, hypersensitive mucosa, bruxers, knife edge ridge/atrophy
how are resilient liners used
heat processed to the denture base as a reline procedure
elastic deformation of the liner does what
allows the material to absorb energy/pressure of occlusion, decreasing pressure on mucosa
what are the materials that make up resilient liners
- silicone elastomers
- polyurethane elastomers
- vinyl- acrylic polymers
- rubber
how long do liners last
6 months - 5 years
what are the other uses of resilient liners
- ridge atrophy - mental foramina, sharp ridges
- surgery contraindicated (implants not possible or implant failure)
- bruxers
- restore congenital/acquired defects- can engage undercuts with resilient prosthesis
- xerostomia - irradiation, medications
- relief areas- median palatal raphe
- single mandibular denture
what is an indication for metal base dentures
repeated fractures of a conventional denture.sometimes seen when a single denture opposes natural dentition
what are the advantages of the metal base dentures
- stronger, less likely to fracture
- less porous
- more accurate
- less deformation of base during function
- better thermal conductivity
- better tissue tolerance
what is a disadvantage of metal base dentures
difficult to reline
what are the materials used for cast metal bases
- Ni- Cr or Co-Cr
- Gold (type IV)
- aluminum
what are the tissue changes that occur
- stresses of daily function
- changes in general health status
- hereditary factors
- defects in dentures -> produce changes in tissue form
a procedure is needed every ____ after initial insertion
4-7 years
why reline/rebase?
- fit of the denture base to the foundation is poor
- denture is not stable and/or is non retentive
- denture base is fractured, discolored or underextended
