In the printing materials are:ELASTIC: those that pass from a fluid state to a highly elastic. Or solidwhich can be removed from undercuts with relative ease and withminimal deformation. THESE ARE CLASSIFIED IN TURN IN: HYDROCOLLOIDS. -Reversible (AGAR-AGAR) -Irreversible(ALGINATO) FIG.02- PRINTING OF SILICON. 2.ELASTOMERS -Poly mercaptano sulfuré. -Silicona por condensación FIG 03-SILICONE -Addition silicone IMPRESSION BY CONDENSATION -poliésteres
NON ELASTICS : Those materials that react assume rigidity, andin some cases little or no elasticity.CLASSIFIED IN TURN IN:1-type plaster Paris.2-molding compounds.3-impression pastes.4-wax to take impressions.5-Polymers to take impressions FIG.4-PLASTER PARIS FIG.-5 WAX PRINT
WHAT IS THE ALGINATE???..Alginate is a purified chemical obtained from brown seaweeds.These substances are for organic polymers derived from alginicacid. FIG.-8 BROWN ALGAE
CARACTERISTICAS»Son compuestos que incluyen una variedad de productosconstituidos por los ácidos D-MANURICO y L-GULURONICO y que son extraídos de algas marronesconocidas como Phaeophyceae, siendo que las másimportantes para la producción comercial de los alginatos. FIG.-9 ALGAS PARDAS (PHAEOPHYCEAE
CLASSIFICATION ALGINATES»Alginates with additives: additives were added to improve the surfaceAlginates chromatic: alginates which are added are pH indicatorsIn order to know when to remove the teaspoon Alginates with antiseptic substances: these substances was added as chlorhexidine in order to avoid cross infection
USES OF THEALGINATE»Alginate is a material widely used in dentistry forimpressions of teeth and adjacent soft tissues. FIG.-11 PRINT MAKING ALGINATE FIG.-10 INSTRUMENTAL ALGINATE
Components»The main component of the alginate is the sodium salt of the acidalguinio.Furthermore, the powder contains calcium sulfate, trisodiumphosphate.(Trisodium phosphate allows a more prolonged handling of thepreparation, thus it is said that retards the staling)
ADVANTAGES» -ECONOMIC. -EASY HANDLING. -Hydrophilic properties FIG.-12 MAKING CORRECT alginate impression.