waxes

Question 1

Although not used in the final dental restoration, dental waxes are important in what

Answer 1

they are important in the fabrication and success of the final metal or ceramic dental restoration

Question 2

what are the usual component waxes in dental waxes

Answer 2

Organic molecules with high-molecular weights

Question 3

Name two examples of organic molecules

found in dental waxes

Answer 3

hydrocarbon and ester

Question 4

name 3 properties of waxes and what 2 factors do they depend on

Answer 4

1. hardness
2. melting range
3. flow

they depend on

1. amount of various waxes
2. molecular structure of the organic molecules in the mixture

Question 5

waxes can be calssifies into 2 types, name them

Answer 5

1. pattern waxes

2. processing waxes

Question 6

name the 3 types of PATTERN waxes and their usage

Answer 6

1. casting
2. baseplate
3. inlay

usage: fabrication of a restoration using the Lost wax technique

Question 7

when using the “lost wax” technique, what type of wax is used

Answer 7

pattern wax

Question 8

what are the 4 types of PROCESSING waxes and what are their usage

Answer 8

1.boxing
2 beading
3.utility
4.sticky

usage: they aid in the making of castings or impressions or during soldering

Question 9

name 5 imp properties of dental waxes

Answer 9

1. melting range
2. flow
3. excess residue
4. thermal expansion
5. residual stress

Question 10

why do dental waxes not have a melting point , but rather a melting range

Answer 10

because they are mixtures of different components

Question 11

define flow

Answer 11

it is a change in shape or dimension in response to an applied force

Question 12

in which of the following type of waxes is FLOW desirable, and why;
pattern
processing

Answer 12

in processing waxes, flow is a highly desirable quality because these waxes need to be pliable at room temp

Question 13

why is flow an undesirable quality in pattern waxes

Answer 13

because they result inpermanent distortion of wax pattern

Question 14

which dental material has the highest coefficient of thermal expansion

Answer 14

waxes

Question 15

how can we prevent residual stress from forming

Answer 15

waxes should not be carved or burnished at temp well below their melting range

Question 16

define residual stress

Answer 16

is stress remaining in wax as a result of maniplation during heating cooling bending carving or other manipulation.

Question 17

what are pattern waxes used for

Answer 17

they are used to create a model of a dental restoration such as a crown or partial denture that eventually is cast using the lost wax tech

Question 18

what waxes are used to form the wax pattern of the metallic framework of removable partial dentures

Answer 18

casting waxes

Question 19

name 3 imp properties that pattern waxes must possess

Answer 19

1. low flow at their working temp to prevent distortion of the wax pattern
2. melting range of the wax must be higher than the environment in which the pattern is made
3. all pattern waxes and resins must burn out with NO residue because it woul interfere with the casting of the pattern

Question 20

why is sticky wax a somewhat misleading name

Answer 20

because it is hard and brittle at room temp however when heated it is sticky and will adhere tenaciously

Question 21

what is corrective impression wax used for

Answer 21

wax veneer over n originaal impression to register the detail of soft tissues in a functional state

Question 22

what are bite-registration waxes used for

Answer 22

sccurste articulation of certain models of opposing arches

Question 23

what is bite registration

Answer 23

Bite registration is taking an impression of a patient’s upper and lower teeth in the bite position to assist in the making and fitting of crowns, dentures, mouthguards,