Silicone by addition for dental uses

1. Universidad Autónoma de Ciudad Juárez.
ICB
Silicone by addition.
Dra. Dianely Contreras Escobar.
Dr. Alfredo Nevárez Rascón.

2. *History of the materials of impression:
• 1856 beeswax.
• 1864 Gutta hanger.
• 1900 Gypsum of impression.
• 1925 Hidrocoloides reversible.
• 1940 Alginatos.
• 1954 Mercaptanos (silicone by addition)
/polysulfuros. • 1955 Silicone by condensation.
• 1964 Polyteros.
• 1975 Silicone by addition.
• 1985 Silicone by addition "hidrofílicas".

3. Receive this name an elastic impression materials group, of similar
nature to the rubber. they are of hydrophobic character that is to
say that they reject the water, from there the term of not watery.
The process by means of which they harden is called:
POLYMERIZATION, that form of macromolecules from small
molecules, simple calls as monómeros , exist hree different
classes.
picture 2 picture 3
picture 1
Oilcloths of polisulfuro silicone polieteres
http://dentizta.ccadet.unam.mx/

4. silicone
The silicone are the result of the investigators in dental materials to create a product with
the positive characteristics of the oilcloths of polisulfure; but without their disadvantages.
They are presented in diverse tenants, depending on the commercial mark and of their
consistency, they can be in flasks of wide mouth for those of consistency heavy and very
heavy, in pipes collapses for those of consistency medium and light. The catalyzer is
presented also in the shape of liquid in glass dropper flask. The most recent presentation
is in gun of self cueing with cartridge and case.
CONSISTENCIES: Very heavy or Heavy Regular Light or light putty.
picture 4
http://dentizta.ccadet.unam.mx

5. COMPOSITION
Exist two varieties or types of silicone relating to their
composition and their form of polymerization.
A) POLYMERIZATION BY CONDENSATION
B) POLYMERIZATION BY ADDITION.

6. picture 5
They are of addition
because they do not
free a byproduct as
such, only there is
liberation of H2, that
does
Materiales dentales, Barceló
not affect the
santana y palma calero. contraction, only the
emptied.

7. Silicone of addition.
The silicone of addition are materials of
not stiff impression, irreversible (reaction
of chemical polymerization by addition), it proceeds to it takes of final impressions
that belong to the group of the
by means of silicone of addition
elastómeros. They present biological,
physical, chemical properties and
adequate viewpoints that permit them to
be one of the dental materials for more
used final impressions currently. The
silicone of addition is manufactured with
high, average, low consistency and a http://www.oclusion.es/2007/02/26/pro
picture 6 tocolo-en-rehabilitacion-oral-integral/
putty, and is a polisiloxano.

8. Use:
This material of impression is the material
of election in fixed prosthesis
Picture 7
bustamantelab.blogspot.com

9. impression
obtained
(savings of
material,
picture 8 absence of
pores and
draggings)
http://www.dentsply.es

10. *Composition:
1 .-ftalatoPolymer Polivinil siloxano.
2 .- activator (catalyser) Acid chlorine platínico.
3 .- material of backfill colloidal Silica.
4 .- Silano.
5 .- Plastificante Dibutil ftalato. .
picture 9
Materiales dentales, Barceló santana y palma calero.

11. *- rowboat= base. and proportion :
Presentations
-Pipe =catalyser.
-Pipe =silicone flowed.
-It can be presented in a device
of auto mixes.
-To mix in equal quantities the
base and the catalyser.

12. Characteristics :
oResultant byproduct of the reaction by condensation of H2O and I oxidize of
PH.
oSuffers during the polimerizado a reaction exotérmica of approximately 3ºC.
oOf scarce use on the part of the dental surgeon. Consistency
oDeformation permanent
oFlexibility (the tension before compressional
loads)
oHardness
oResistance to the traction
picture 10
http://www.medilegis.com/Banc
oConocimiento/O/Odontologica
-v1n3-
materiales/materiales.htm

13. Handling :
1. For the medium and light consistencies, besides the
techniques already indicated, this material can be
manipulated with accessories, such as two united cartridges
in whose exit a spiral mixer of plastic is inserted, that
permits, through a special gun, to expel the pastes in the
proportions required, to homogenize the mescla and to inject
it directly in the zone that goes to impress or to fill the small
spoons without need of syringe.

14. picture 11
Materiales dentales, Barceló santana y palma calero.

15. Handling
2. The mixture of the very heavy consistency
is facilitated for being done in equal
proportions base and catalyser.
3. It is not recommendable the mixture of the
very heavy consistency with the hands and
with gloves of latex, since the sulfur of its
formulation impedes that polimerice the
product.
4. The sulfurs that are removed of some
threads used to shrink the gum they can inhibit
the polymerization upon entering contact with
the product.

16. Handling
 5. The time of work is but short that with the sulfur cop
oilcloths. But the technique of mesclado described
permits us to include a little but of time of work.
 6. It is the material but exact and with greater stability
you measure of all the elastómeros.
 7. Can be electroposives with silver and copper.
 8. Is a hydrophobic material, for which one must be
careful upon devising the model of gypsum.
 9. The control of septic infections without there can be
carried out be changes in the dimensions of the
impression.
 10. They are the most expensive of all the elastómeros
not watery, by the product in if and by the accessories
required for their handling.

17. • Are the most exact available. • Smell • Expensive.
and pleasant flavor. • Sensitive to contaminant.
• Excellent stability dimensional. • Liberation of hydrogen (volatile) during the
• High recovery to the deformation. polymerization as this produces deformation
in the emptied, the emptied should not
• Stable to the disinfection.
be done immediately (1 –24 hrs).
• Available in devices of automezcla
when we utilize devices of automezcla
we avoid the formation of bubbles,
since the proportions are exact.
• Hidrofílicos.
• It Emptied after 1 hour, as a
minimum thing
that the H2 is found freed and alter not
the emptied in the gypsum.

18. ! Permalastic. http://www.kerrdental.com
picture 12
.
! Coe-Flex. http://www.gcamerica.com
picture 13
Affinis Micro. http://www.gcamerica.com
picture 14
Affinis Putty http://www.gcamerica.com
picture 15
picture 16
President Putty http://www.gcamerica.com

19. Materiales dentales, Barceló santana y palma calero.
Ciencia de los materiales dentales, Phillips ,undécima edición
Materiales dentales, Machi,3ra edición.
http://www.radiodent.cl/materiales_dentales/siliconas.pdf
http://html.rincondelvago.com/elastomeros.html
http://www.gcamerica.com