elastomers for dental uses

Elastomers

(polysiloxanes) : Used to identify materials with a particular

structure. Are organic materials consisting

of polymer molecules with the ability to

"stretch", "develop," compressed

"ultimately bear to tensions mouth.

Chemically there are four types of

elastomeric impression materials used as:

1.Polisulfure

2. Silicone condensation polymerization

3. Addition polymerization silicone

4.Polyether

http://www.slideshare.net/yuri

tek/elastom2005-presentation

Fig#1

Fig#2

Fig#3

Fig#4

mercaptans

CONDENSATION

SILICONES

POLIETERS

ADDITION SILICONE

According to the reaction to which they are

subject to change to a plastic state

Those who change their status in a physical

reaction, it is to say, which do not change

their properties, only its consistency when

subjected to heat.

. Wax printing

. Model compounds or Godivas

.reversible hydrocolloid

Wax printing Fig.# 15

Godivas

fig.#16

http://www.dentusonline.c

om/productos/detalle.php?i

d_pro=341

http://www.dental-

wax.com/spanish/index-

sp.html

Classification according to their

behavior during setting, hardening or curing.

elastic:

. Mercaptans.

. Elastomers silicones.

. Polyethers.

rigid:

Model compounds or góbidas.

Waxes.

Casts.

characteristics to be met by printing

materials to be considered optimal

for management

Easy to handle.

. Compatibility with oral tissues.

. There are irritating.

. Not allergic.

. Taste and look nice mix.

low cost.

. that when subjected to disinfecting

solutions preventing alterations

. Hydrophilic Where possible, that does

not affect the presence of moisture

Use of elastomers in odontology : 1 PLAY STRUCTURES WITH HIGH

FIDELITY MOUTH.

Fig#5

2. OCCLUSAL RECORDS MAKE OR BITE,

ACCURATE .

3 OTHER USES : MISMATCH INDICATOR OF

RESTAURATIONS

http://expodenta

l.wordpress.com Fig#6

Fig#7

http://www.slideshare.net/yuritek/elasto

m2005-presentation

- PRINTING MATERIAL

FOR DUPLICATE MODELS

Fig#8

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ritek/elastom2005-

presentation

Silicones:

Elastic materials

are based impressions polydimet

hyl siloxanes orpolyvinyl siloxan

es. They owe their name to

the presence of silica and

oxygen in its composition

FIG#9

http://www.dentald

eml.com/catalogo/c

ubetadealuminio.ht

m

Uses: prints are used for crowns and fixed

bridges For bite registration and laboratory

procedures for the process of partial and full

dentures.

Fig#17

Fig#18

polydimethylsiloxane

Ethyl ortho silicate

Silica filler

CATALYST : Tin octoate

Tin octoate

Silicone Rubber

ethyl alcohol.

Condensation silicone

composition

The chemical reaction of a condensation silicone is as follows

silicate ortoalquílico

polydimethylsiloxane+ silicate ortoalquilico ----

polydimethyl siloxane + Alcohol

PROPERTIES:

. The working time of the silicones is 2-

4 minutes less than the mercaptans

Polymerization time: 6-

3 minutes is comparatively less than the

mercaptans, the polymerization time can be

changed with

temperature temp. High polymerization acce

lerates

Dimensional Stability: Like other print

materials, condensationsilicones contract.

. Can be reduced using well

adapted trays with a thickness of 3 to 4mm.

. Elastic recovery: the recovery is

approximately 100% higher than virtually all

other elastic materials.

Fluency: compared with the mercaptans,

these materials are morerigid and therefore

have better flow.

Flexibility: inflexible compared to the

mercaptans and more flexible than the

polyesters

Toxicity of silicones are not toxic, however it

is recommended not to touch his hands and

not take material improperly

mixedimpressions.

easy handling .It is stable over short periods of time .Have different elastic properties .Can be prepared with different viscosity resists displacement of the gingival tissues .It has pleasant taste and odor

.Sensitive to high temperatures .Evaporation of alcohol .Short working time for multiple prints .Greater contraction of polysulfides .Short life

TRADEMARKS:

SPEDEX

GUMAX

ZETAPLUS

ORANWASH L

COLTOFLAX

Fig#10

FIG#11

FIG#14

FIG#13

FIG#12

http://kengyew.net/p

roducts/Oranwash-

L.html

http://productosd

entaleslitadent.blo

gspot.com

Bibliography: .Materiales dentales 3ra. AUTOR: Edición MACCHI

.BIOMATERIALES DENTALES . AUTOR: José Luis Cova N.

.La ciencia de los materiales dentales AUTOR: Skinner Phillips 9na.

Edición

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