Applied Dental Materials 1 Lecture 6 (Dental Waxes)

Front 1

What are the 3 basic categories of dental waxes?

Back 1

impression, processing, pattern

Front 2

corrective and bite registration make up what category of dental waxes?

Back 2

impression

Front 3

boxing, carding, white, sticky, blackout, and utility make up what category of dental waxes?

Back 3

processing

Front 4

inlay, casting, baseplate, and resin make up what category of dental waxes?

Back 4

pattern

Front 5

True or false, waxes contain only natural organic molecules

Back 5

False, natural AND synthetic

Front 6

What is defined as a hydrocarbon or hydrocarbon-derivative polymer of mineral, plant, insect, or animal origin, usually having long chains of average molecular weight ranging 400-4000

Back 6

Natural wax

Front 7

What is defined as mixtures of high-molecular weight organic substances obtained from plant or tree exudates?

Back 7

natural resins

Front 8

what is defined as a man-made wax synthesized from appropriate polymers?

Back 8

synthetic wax

Front 9

Put these steps in order

A. Master die prep
B. Burnout
C. Casting
D. Wax pattern formation
E. Cavity/tooth prep
F. Impression of prep
G. Investment of pattern
H. Finish and delivery

Back 9

E, F, A, D, G, B, C, H

Front 10

What is the name of the piece connecting the base to the wax pattern?

Back 10

sprue (Khajotia joke: No, not a spruce, like the coniferous evergreen tree)

Front 11

Which "type" of inlay wax is placed directly in the mouth?

Back 11

Type I

Front 12

Type I uses (direct/indirect) inlay technique

Back 12

direct

Front 13

Type II uses (direct/indirect) inlay technique

Back 13

indirect

Front 14

Which type of inlay (1 or 2) uses medium/hard wax?

Back 14

1

Front 15

Type II inlay wax uses (hard/medium/soft) wax

Back 15

soft

Front 16

What specific category of wax is composed of natural and synthetic waxes, natural resins, gums, oils, fats, and coloring agents?

Back 16

inlay wax

Front 17

What wax is soft, flaky, from petroleum, forms 40-60% wt, and has a 50-70C melting range?

Back 17

paraffin wax

Front 18

What wax is hard, tough, from palm trees, 60-90C melting range, toughens paraffin wax and raises its melting range, adds glossiness, decreases flow in mouth?

Back 18

carnauba wax

Front 19

Gum dammer is also called dammer ___

Back 19

resin

Front 20

Is gum dammer a synthetic or natural resin?

Back 20

natural

Front 21

What material toughens paraffin wax, improves smoothness and luster?

Back 21

gum dammer

Front 22

What wax can partially or entirely replace carnauba wax?

Back 22

candelilla wax

Front 23

Candelilla wax has a (higher/lower) MP and is (harder/softer) than carnauba wax

Back 23

lower, softer

Front 24

Which inlay wax is most brittle?

Back 24

beeswax

Front 25

Which wax is brittle, good flow at oral temp, insect wax, 60-70C melting range?

Back 25

beeswax

Front 26

Match these numbered temp ranges with the proper wax

1. 60-90
2. 60-70
3. 50-70

A. Paraffin wax
B. Beeswax
C. Carnauba wax

Back 26

A3, B2, C1

Front 27

Which wax modifies toughness and carving characteristics of paraffin?

Back 27

ceresin wax

Front 28

An ideal wax:

soften (unevenly/uniformly)
be of (similar/dissimilar) color to oral environment
Not leave residue greater than __% of original weight at ___C

Back 28

uniform, dissimilar, 0.1%, 500C

Front 29

What is the measure of potential of an amorphous material to deform under a small static load (such as itself)

Back 29

flow

Front 30

What causes flow on the molecular level?

Back 30

long chain molecules slipping across each other

Front 31

Flow (increases/decreases) as wax approaches it's MP

Back 31

increases (drrrrr)

Front 32

True or False, Type I and II wax have the same recommendation for what % of flow they should have at 45C

Back 32

true (see page 4, slide 6)

Front 33

At a raised and constant temperature temperature, flow will (increase/decrease) with time

Back 33

increase

Front 34

True or False, waxes melt at a specific temperature

Back 34

False, they melt in a range

Front 35

Waxes (do/do not) have a thermoplastic nature

Back 35

do

Front 36

Waxes have (high/low) thermal conductivity

Back 36

low

Front 37

What name is given to the temperature range which denotes a change from solid to glassy state on heating, and vice versa on cooling?

Back 37

glass transition temperature

Front 38

Wax has elastic memory, what does this mean?

Back 38

The wax tends to reform its original shape if slightly heated and cooled again

Front 39

What type of stress can be stored on a wax as a result of manipulation or non-uniform heating are released after cooling

Back 39

residual

Front 40

Elastic recovery of waxes is (fast/slow) at LOWER temperatures

Back 40

slow

Front 41

Casting is only as accurate as what?

Back 41

the wax pattern it's made from

Front 42

What type of wax is used for thin sections of removable and fixed partial dentures?

Back 42

casting wax

Front 43

What type of wax is uniform in a cross section?

Back 43

casting wax

Front 44

Resins have (higher/lower) strength and (higher/lower) flow than waxes

Back 44

higher strength, lower flow

Front 45

Pattern resins are applied in layers about how thick?

Back 45

3-5mm

Front 46

What wax is made of 75% paraffin or ceresin wax, beeswax, and other resins/waxes?

Back 46

baseplate wax

Front 47

What wax is used to establish the initial arch during construction of complete dentures?

Back 47

baseplate wax

Front 48

Which wax is used in ortho?

Back 48

baseplate

Front 49

what wax is used for bite registration?

Back 49

baseplate

Front 50

ADA/ANSI specification No. 24 classified baseplate waxes based on flow at what 3 temperatures?

Back 50

room temp, oral temp, and 45C

Front 51

What type of baseplate wax is soft and used for building veneers and contours?

Back 51

Type 1

Front 52

What type of baseplate wax is medium hardness and used for patterns to be tried intra-orally in normal (temperate) climates?

Back 52

Type 2

Front 53

What type of baseplate wax is hard and used for patterns to be tried intraorally in tropical climates?

Back 53

Type 3

Front 54

What type of wax is used to attach parts and in some soldering techniques?

Back 54

carding wax

Front 55

What wax is used to make patterns and simulate veneer facings?

Back 55

white wax

Front 56

what wax is used in pouring impressions using single-pour technique?

Back 56

boxing wax

Front 57

What wax is soft and pliable; used to extend impression tray or to gain more depth when capturing the vestibular margins?

Back 57

utility/periphery wax

Front 58

What wax is hard/brittle at room temp but adheres tenaciously when heated to permit temporary joining of broken bridges or denture parts during repair process?

Back 58

sticky wax

Front 59

What wax is used to record the occlusal surfaces of teeth to help establish maxillary-mandibular relationships?

Back 59

bite-registration wax

Front 60

Corrective wax is also known as ____ wax

Back 60

impression

Front 61

what wax is thermoplastic, soft at oral temp and rigid at room temp?

Back 61

corrective wax (impression wax)

Front 62

what wax distorts if they are withdrawn from undercut areas, and used in edentulous arches or in occlusal surface areas?

Back 62

corrective wax (impression wax)