Dental Materials Final

Front 1

What was introduced in 1955?

Back 1

Acid-etch technique

Front 2

How long does the process for the ADA Seal of Acceptance take for completion?

Back 2

3 months

Front 3

Who is directly responsible for delivering dental materials?

Back 3

dental assistant

Front 4

How does the ADA define evidence-based dentistry?

Back 4

an approach to oral health care that requires the judicious integration

Front 5

When was the earliest evidence of restorative dentistry?

Back 5

600 B.C.

Front 6

Some dental materials may be _______ in small quantities but _____ or _____ in larger doses

Back 6

therpaeutic; irritating or toxic

Front 7

What is the normal masticatory force on occlusal surfaces of molar teeth?

Back 7

28,000 lbs per square inch

Front 8

What Shearing Force?

Back 8

when two surfaces slide against each other

Front 9

What has the highest compressive strength?

Back 9

Amalgam

Front 10

What is the normal pH of saliva?

Back 10

6.2 - 7

Front 11

The staining of resins due to repeated exposure to coffee, tea, and other dyed beverages is due to?

Back 11

water sorption

Front 12

Galvanic Stimulation will _____ with time as oxides form on the surface of the metal. What is Galvanism?

Back 12

descrease; an electrical current transmitted between two dissimilar metals

Front 13

Excessive expansion of a restorative material may result in?

Back 13

fracture of cusps

Front 14

What is Tensile Force?

Back 14

force applied in opposite directions; pulled or stretched

Front 15

If stress within an object can't resist the force, what happens?

Back 15

distortion or deformation

Front 16

Galvanism may result in what?

Back 16

stimulation of the pulp (galvanic shock) and a metallic taste in the mouth

Front 17

Some materials, when mixed produce heat, this is called?

Back 17

Exothermic Reaction

Front 18

What can happen if the interface is not sealed?

Back 18

Microleakage

Front 19

Medicated bases or topical treatments for periodontal disease are considered ____ ?

Back 19

therapeutic materials

Front 20

Dental plaster begins with?

Back 20

water and powder components

Front 21

Dual set materials utilize what?

Back 21

light-activated and chemical setting reactions

Front 22

What is the structure of solids?

Back 22

molecules arranged in a random form with no pattern

Front 23

What is viscosity?

Back 23

material's ability to flow

Front 24

What is the shelf life?

Back 24

deterioration or change in quality of the material over time

Front 25

Packable composites are used for what?

Back 25

restoration of posterior teeth in areas of high function

Front 26

Where is it recommended to put composite material and why?

Back 26

refrigerator so it can reduce the sticking of the material to the placement instrument

Front 27

What are glass ionomers used for?

Back 27

luting cements, lamination, liners&bases, pit&fissure sealants, restorative materials, and ART

Front 28

How can polymerization shrinkage be minimized?

Back 28

placing the restoration in small incremental layers

Front 29

What highly desirable characteristics do glass ionomers have

Back 29

release fluoride

Front 30

What do manufacturers give to help in shade selection?

Back 30

shade guide

Front 31

What is considered the worst failure?

Back 31

a leaking sealant that remains in place

Front 32

What is amalgamation?

Back 32

when the silver alloy is mixed with liquid mercury

Front 33

How long does it take for most amalgams to gain max strength?

Back 33

24 hours

Front 34

What is creep?

Back 34

a phenomenon that occurs in the gamma-2 phase associated with low-copper amalgams

Front 35

Amalgams are weak in ___ & ____ and require ______ to resist breaking

Back 35

tension and shear; adequate bulk

Front 36

What is a triturator?

Back 36

mechanical device that mixes the amalgam and the mercury

Front 37

What does an under-triturated material look like?

Back 37

dry- crumbly appearance that sets too quickly resulting in a weak restoration

Front 38

How long do patients have to wait to chew/eat after a newly placed restoration?

Back 38

8 hours

Front 39

What have studies shown about the mercury levels?

Back 39

they are below OSHA's recommended minimum

Front 40

What is modern dental alloys composed of?

Back 40

13-30% copper'

40-70% silver

12-30% tin

43-50% mercury

Front 41

What is weak and corrodes easily?

Back 41

gamma-2

Front 42

What happens once amalgam is hard?

Back 42

attempts at carving may damage the amalgam margins or cause fracture of portions of amalgam mass

Front 43

What is the purpose of posts?

Back 43

to retain core buildup over which the final restoration is placed

Front 44

Resin cement is high in what?

Back 44

mechanical strength and fracture toughness

Front 45

Why is zinc polycarboxylate no longer usable?

Back 45

loses its gloss and becomes stringy

Front 46

For a maxillary alginate impression, where does the operator stand?

Back 46

behind the patient at the 11 o'clock

Front 47

How long can PVS be poured without distortion?

Back 47

a week

Front 48

What is wrong with alginate?

Back 48

not accurate enough for the final impressions of inlay, onlay or crown and preparations

Front 49

Setting time can be lengthened by _____ and shortened by ______

Back 49

cold water; warm water

Front 50

A completed impression creates a ________ reproduction of teeth and tissues?

Back 50

negative

Front 51

What will a properly selected tray cover?

Back 51

all of the teeth into the facial and lingual vestibules without impinging on the tissues, and will extend posteriorly to include the retromolar area for a mandibular tray

Front 52

Examples of pattern waxes

Back 52

inlay wax, casting wax, and baseplate wax