Dental materials 2

The correct answers about the hydrocolloids are:

• The agar agar impression materials are irreversible hydrocolloids

• The alginates are reversible hydrocolloids

• Are elastic materials

• Dimensionally unstable

The FALSE answers about alginate are:

• Its an elastomer

• Its an elastic material

• Easy manipulation procedure

• Dimensional stable

The FALSE answers about alginate are:

• Its an elastomer

• Its an elastic material

• Easy manipulation procedure

• Dimensional stable

The elastomers:

• Are rubber like materials

• Polysilcones are not elastomers

• Has dimensional stability

• Are reversible

The correct answers about gypsum are:

• Type 1 is used for hard dies

• Type 1 is used for impression

• Its a brittle material

• There are 8 types

The true answers about the Biocompatibility of dental materials are:

• The materials should not harm the pulp

• Should not contain xeroestrogen

• Should undergo biodegradation

• Should sensitize and produce allergy

!Which metal is the most toxic?

• Gold

• Chromium

• Nickel

• Cobalt

The correct answers about the temporary restorative materials are:

• It shoud have the ability to promote the healing process

• Zinc oxide eugenol is not a temporary material

• It should have antibacterial and cariostatic properties.

• Glass ionomers are temporary cements

According to the PH values of cements

• Silicate cement is an acidic cement

• Zinc oxide eugenol is an acidic cement

• Zinc oxide eugenol is almost neutral

• Calcium hidroxide is an acidic cement

About the composite resins

• Hard to manipulate

• Superior aesthetics

• Easy to manipulate

• Cheeper than amalgam