Crown and Bridge Resin
These tooth-shaded acrylic resins are used in fixed
prosthodontics to make temporary and permanent
restorations. The self-curing type is used as an interim
restoration while the permanent one is being
fabricated. This resin is normally used with a vacuum
or pressure-formed matrix to sculpt the contours of the
interim crown or bridge.
Self-curing orthodontic resin is used to fabricate
nightguards and orthodontic retainers. It is normally
supplied in the clear and pink types and can be used
with several tinted liquids to produce different shades.
These resins are used to fabricate interim RPDs
and to repair any acrylic prosthesis. They are normally
only stocked by the dental clinic in self-curing pink
and light-pink fibered shades.
oral tissues, head, and neck. Custom fluoride trays also
are made out of this material for prescribed home
treatment with fluoride gels.
Separating media prevents one material from
bonding to another material. The medium coats the
cast and seals off the pores so acrylic resins can now be
fabricated on a dental cast and removed.
One type of separating media is tinfoil substitute
that when used, forms a film on the cast. To use, paint
it on the cast with a soft bristle brush. The film is
fragile and can easily be scuffed off. If this occurs,
remove the entire film and repaint. Place the acrylic
resin to the cast within 1 hour of painting the film on
the cast to avoid deterioration. Do not allow gypsum
particles to contaminate the bottle of tinfoil substitute
when applying to a cast. Many other commercially
prepared separators are available to prevent bonding.
Self-curing tray acrylic is used to make
customized impression trays. Tray acrylic is usually
light blue or white in color. You can lengthen the
working time of this material by submersing the dough
in cold water before it is ready to use.
Along with the prosthodontic materials previously
explained in the above categories, you need to become
familar with other miscellaneous materials such as
alcohols, mouthguard materials, separating media,
tray adhesive, and treatment liners.
Isopropyl, methanol, and denatured ethanol are
examples of fuels used in an alcohol torch for softening
plastic or melting wax. Of the three, denatured ethanol
is preferred since it is safer to use and burns cleaner.
Mouthguards are made from polyvinyl materials.
This thermoplastic resin is molded over a cast by
means of a vacuum-forming machine. The use of
mouth protectors in sports is to reduce injuries to the
Custom impression trays are coated with this
adhesive before they are filled with rubber impression
This ensures that the impression material
stays in the tray when it is removed from the mouth.
Tray adhesive in spray form is also available for use
with alginate impression materials and stock
Treatment liners, also know as tissue conditioners,
allow oral tisses to recover, improving tone and
health, before making a new denture or reling an
existing one. The dentist changes the tissue
conditioner at 3- to 4-day intervals since liners stiffen
The prosthodontic equipment that you will use
will be located in the dental laboratory and the
prosthodontic DTR. Only the basic equipment is
mentioned. Never operate or use any type of
equipment without first reading the manufacturer's
instructions on use, safety precautions, and