Properties-Introduction

Question 1

Inlay

Answer 1

Restoration made to fit into a tapered cavity preparation

Question 2

Crown

Answer 2

restoration that restores anatomy and function of part or all the coronal portion of tooth

Question 3

Clasp

Answer 3

clawlike metal attachment of a partial denture that grasps the natural teeth

Question 4

Denture

Answer 4

a removable prosthesis that replaces all the teeth of the upper or lower arch

Question 5

Dimensional change

Answer 5

percent shrinkage or expansion of a material

Question 6

Thermal Dimensional change

*Linear Thermal Expansion Coefficient

Answer 6

• subjected to temperature changes

* a measure of how much it expands per unit length if heated one degree higher

Question 7

Thermal Conductivity

Answer 7

• measure of heat transferred

- high conductivity values = good conductors of heat and cold

Question 8

Galvanism

Answer 8

• generation of electrical currents that the patient can feel
• when dissimilar metallic filings are present on opposing teeth; patient experiences pain during contact of filings

Question 9

Corrosion

Answer 9

-dissolution(dissolved) of metals in mouth

Question 10

Tarnish

Answer 10

-surface reaction of metals in mouth from components in saliva or foods

Question 11

-Solubility and sorption

Answer 11

• in weight percent of soluble or sorbed material

- as weight of dissolved or sorbed material per unit of surface area

Question 12

Sorption

Answer 12

adsorption + absorption

Question 13

Adsorption

Answer 13

• when dissimilar materials are in intimate contact w/ each other, there’s no surface action
• no penetration of material from one surface into the other

Question 14

Absorption

Answer 14

• substance particle usually penetrates surface of a solid surface
• refers to uptake of liquid by the bulk solid

Question 15

Wettability

• low contact angle
• contact angle

Answer 15

-measure of the affinity(attractive force) of liquid for a solid as indicated by spreading of a drop

• solid is readily wetted by a liquid: hydrophilic
• is greater than 90 degrees: poor wetting ability

Question 16

Stress

Answer 16

• Force per unit area

- Load/area e.g. pencil

Question 17

Strain

*Elastic Modulus

Answer 17

• the change in length per unit length of a material produced by stress
• deformation per unit length
• is equal to the ratio of the stress to the strain in the linear or elastic portion of the of the stress strain curve
• a measure of stiffness of a material

Question 18

Proportional limt and yield strength

Answer 18

-measures of stress allowed before permanent deformation

Question 19

Ultimate strength

Answer 19

-stress at which fracture occurs

Question 20

Elongation and Compression

Answer 20

-measures of ductility and malleability

Question 21

Malleability

Answer 21

-ability of substance to be hammered or rolled into thin sheets without fracture

Question 22

Ductility

Answer 22

-ability of a material to be drawn into wire under tensile strength

Question 23

Resilience and Toughness

Answer 23

-indicate the energy absorbed up to the proportional limit and ultimate strength, respectively and relate to the resistance to deformation and fracture under impact

Question 24

Hardness

Answer 24

-resistance of a material to indentation