Dental Materials Ch. 2 Flashcards Preview

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Flashcards in Dental Materials Ch. 2 Deck (10)
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1

the molecules found in a pane of glass can be best described as

(a) Crystalline solid, having short-range order only

(b) Crystalline solid, having both short-range and long-
range order

(c) Amorphous solid, having long-range order

(d) Amorphous solid, having short-range order

(d) Amorphous solid, having short-range order

2

a partial charge resulting from an uneven distribution of electrons around an atom forms a bond known as

(a) Metallic

(b) Secondary

(c) Covalent

(d) Ionic

(b) Secondary - partial charges result

3

what type of bond is formed when the electrons are shared by all the atoms that make up that object and may be thought of as positive cores in a cloud of negative mobile valence electrons

(a) Metallic

(b) Secondary

(c) Covalent

(d) Ionic

(a) Metallic
 

4

a notable advantage of using ceramic materials in dentistry is the property of

(a) Transparency

(b) Translucency

(c) Opacity

(d) Brittleness

(b) Translucency

5

a dental polymer with many cross-links as compared to one with no cross-links would be a dental material that is

(a) Flexible but strong

(b) Flexible and weak

(c) Stiff and strong

(d) Stiff but weak

(c) Stiff and strong

6

all of the following are examples of composite except

(a) Set Jell-O with sliced peaches

(b) Enamel

(c) Fiberglass

(d) Tin foil

(d) Tin foil

7

when the shared electrons of a covalent bond are not shared equally, and one of the bonded atoms is partially positive and the other is partially negative a ________ is formed

(a) Permanent dipole

(b) Fluctuating dipole

(c) Hydrogen bond

(d) Primary bond

(a) Permanent dipole

8

the sliding of atoms past each other allows this material to bend, not fracture, and maintain its strength. this material is an example of

(a) Metal

(b) Ceramic

(c) Polymer

(a) Metal

9

a mixture of 2 liquids that do not blend together to form 1 liquid is termed a

(a) Composite

(b) Emulsion

(c) Colloid

(d) Solution

(b) Emulsion

10

when 2 atoms share a pair of electrons, the resulting atomic bond is termed a ________ bond

(a) Secondary

(b) Ionic

(c) Covalent

(d) Metallic

(c) Covalent