DH 32 Test #3

AMALGAM

A direct restorative material that is held in place by ........................ retention

• MECHANICAL

• CHEMICAL

Answer explanation

Defined as an alloy of Mercury with two or more metals

............. ........................ is a mixture of mercury, silver, tin, copper, and other elements

• Dental amalgam

• Dental composite

Amalgam has several characteristics that make it popular

• Excellent longevity

• Ease of use

• Low cost

• Aesthetics

AMALGAM

Lack of Biocompatibility, specifically the toxic and allergenic potential, has received attention

• TRUE

• FALSE

Answer explanation

At this time no study has proven a link between dental amalgam and any disease with patients

Uses of Amalgam

• Versatility is its trademark

• Class I, II, V

• Build-ups

• Apical fillings om

Classification of amalgam is according to .........A.......... and ................B.................

• A.

  composition

• B.

  particle shape

• A.

  properties

• B.

  strenght

(Comminuted)-made by filing silver-tin alloy on a lathe.

Irregular shape (200 microns) • Less mushy

• Lathe-cut

• Spherical

Alloy melted and sprayed through a nozzle to form small droplets, quickly cooled to preserve shape (100 microns)

• More mushy

• Spherical

• Admixed

Answer explanation

Admixed-mixture of lathe-cut and spherical

Require less condensation

• Requires heavier wedging

• Require less Hg

• Faster set

• SPHERICAL

• ADMIXED

Require greater condensation

• Better proximal contacts

• Easier to carve

• Longer working time

• ADMIXED

• SPHERICAL