1. Universidad Autónoma de Ciudad Juárez
Departamento de estomatología.
Yeso parís o Yeso Blanco
Alumna. Medina Hernández Brianda
Isidra
Dr. Alfredo Nevárez Rascón
2. Is a fragile plaster which is obtained by
heating gypsum at 110 ° c, is used for castingstudy
models, has a strength of 450 kg per cm2
Fig. 2
Ground gypsum
http://upload.wikimedia.org/wikipedia/commons/
a/a7/Calcium_sulfate_hemihydrate.jpg
3. Plaster of paris is also called:
Fig.3
•Gypsum Modelo de yeso tipo II
•Snow White.
•Gypsum plaster
•White Plaster
•Type II.
http://es.ruthinium.it/dentadura-postiza/productos/plasters/
4. This is the most used in dentistry, is used for
mounting on articulator and prosthesis
Fig. 4
Prosthesis
model made with plaster
paris.
http://www.evolucionodontologica.com/?cat=17&paged=2
5. Common plaster
Yeso of París o Type II
Lime plaster
Cement plaster
Fig.5
Cement plaster.
http://materialdental.blogspot.com/2011/02/yes
os-de-uso-dental.html
6. All have the same chemical formula.
They have different physical properties.
All they are derived from same material
The main difference is the way to eliminate some of
the water gave hydrated sulfate.
You can also use synthetic gypsum to manufacture
some products but are less popular because of its
high cost.
7. The water is placed in a plastic cup. Powder is added.
Allowed to stand in water for about 30 seconds. It
minimizes the amount of air that is incorporated into
the mixture during the mixing.
Perform the mixing with a rigid sheet metal spatula.
The manual consists spatula stir the mixture
vigorously. Properly mix to obtain a uniform mixture,
rubbing in circular motions and try to dissolve any
lumps and to wet the entire mixture
8. In dental use is found as:
Calcium Sulfate CaSO4 · H2O.
And when mixed with water :
CaSO2· 2H2O
Fig.6
Calcium Sulfate
http://fyq4eso.blogspot.com/feeds/posts/default
9. optimal immobilization Dirty apply.
Moldable. Takes to set.
Cheap. Voluminous.
No loss of volume. Heavy.
Do not wet.
