Dra. Dianely Contreras Escobar. Dr. Alfredo Nevárez Rascón.

Silicone by addition. ICB

Universidad Autónoma de Ciudad Juárez.

• 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".

*History of the materials of impression:

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.

Oilcloths of polisulfuro silicone polieteres

http://dentizta.ccadet.unam.mx/

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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.

silicone

http://dentizta.ccadet.unam.mx

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Exist two varieties or types of silicone relating to their composition and their form of polymerization.

COMPOSITION

A) POLYMERIZATION BY CONDENSATION

B) POLYMERIZATION BY ADDITION.

They are of addition because they do not free a byproduct as such, only there is liberation of H2, that does

not affect the contraction, only the emptied.

Materiales dentales, Barceló santana y palma calero.

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it proceeds to it takes of final impressions by means of silicone of addition

Silicone of addition.

http://www.oclusion.es/2007/02/26/protocolo-en-rehabilitacion-oral-integral/

The silicone of addition are materials of not stiff impression, irreversible (reaction of chemical polymerization by addition), that belong to the group of the 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 putty, and is a polisiloxano.

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This material of impression is the material of election in fixed prosthesis

Use:

bustamantelab.blogspot.com

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http://www.dentsply.es

impression obtained (savings of material, absence of pores and draggings)

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*Composition:

1 .-ftalatoPolymer Polivinil siloxano. 2 .- activator (catalyser) Acid chlorine platínico.

3 .- material of backfill colloidal Silica.

4 .- Silano.

5 .- Plastificante Dibutil ftalato. .

Materiales dentales, Barceló santana y palma calero.

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- rowboat= base.

-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.

* Presentations and proportion :

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

Characteristics :

http://www.medilegis.com/BancoConocimiento/O/Odontologica-v1n3-materiales/materiales.htm

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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.

Handling :

Materiales dentales, Barceló santana y palma calero.

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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.

Handling

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.

• Are the most exact available. • Smell and pleasant flavor.

• Excellent stability dimensional.

• High recovery to the deformation.

• Stable to the disinfection.

• 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.

• Expensive. • Sensitive to contaminant. • Liberation of hydrogen (volatile) during the polymerization as this produces deformation in the emptied, the emptied should not be done immediately (1 –24 hrs).

! Permalastic. .

! Coe-Flex.

Affinis Micro.

Affinis Putty

President Putty

http://www.gcamerica.com

http://www.kerrdental.com

http://www.gcamerica.com

http://www.gcamerica.com

http://www.gcamerica.com

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Materiales dentales, Barceló santana y palma calero.

http://html.rincondelvago.com/elastomeros.html

http://www.radiodent.cl/materiales_dentales/siliconas.pdf

Ciencia de los materiales dentales, Phillips ,undécima edición Materiales dentales, Machi,3ra edición.

http://www.gcamerica.com