Dental materials1

Impression materials are:

• Used in endodontics.

• Auxiliary materials

• Restorative dental material

• Used in prosthodontia

The materials that is not used in Prosthodontics are:

• Impression materials

• Wires

• Gypsum

• Resins

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What are the challenges of dental materials in the oral cavity?

• The force of the muscles in the area

• The PH of the saliva

• The enzyme activities

• All answers are correct

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The impression trays:

• Are only metallic

• Support the impression materials

• Can be reusable

• We cannot individualise a tray

The impression material are used to:

• Register the forms and the relationships of teeth

• To cover an empty space

• Reproduce the forms and the relationships of teeth.

• All the answers are correct.

The impression materials:

• Cannot be ideal

• Must be nonpoisonous

• Must be nontoxic

• All the answers are correct

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The ideal requirements of the impressiom materials are:

• Low viscosity

• The taste an odour of it are not important

• Chemically inert in oral comditions

• High thermal conductivity

The FALSE answer about the impression materials is:

• Zinc oxide eugenol is not an impression material

• The waxes and the compounds can be used as impression materials

• Alginates are hydrocoloids

• Can be elastic and non elastic

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The impression trays

• Can be perforated

• Can be reusable

• Can be sectional

• All the answer are correct

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Advantages of the Zn OE impression materials

• Dimensionally stable

• Does not adhere well to dried surfaces

• Easy to manipulate

• Its easy to use when we have undercuts