DENTAL MATERIALS EXAM 2

What could occur if a cast is made from an improperly disinfected impression

What is the ideal time frame for pouring an alginate impression?

Regulation over dental devices

What causes micro leakage?

What is correct about fatigue failure?

What cement forma a chem bond w tooth structure

When preparing to take an alginate impression, what is NOT necessary

Temp @which hydrocolloid liquifies NOT same temp at which it solidifies this is called?

Try in paste is used to

Ultimate strength

What material is able to stand high heat&stress produced when molten melt is forced in molds

What could occur if excess residue remains in the investment mold after wax pattern is melted

Which has been suggested to delay formation of surface tarnish on dental amalgam?

The normal resting PH of saliva ranges from 6.2 to_____, which is neutral

What material has the smallest dimensional change on setting of all elastomeric&hydro material

The stability of a solid is evaluated by noting ?

What is true about initial and final set times

What cement should be removed w alcohol or orange solvent once it has set

b-Hemihydrate is commonly used for:

Dental impression is a ___reproduction of the teeth

Which is NOT associated with employee training practices

What is todays approach to dental care referred to as

By placing a___provisional restoration dentist is able to eval response of pulp before reappoin

Which of the following is true about galvanism

True if vinyl polyether silicone

Hydrocolloid

Increase porosity material make it important to use__h2o to convert the __when mix gypsum

Which of the following is recommended to help manage the pts airway during dental procedure

True concerning the chem properties of gypsum material?

What is considered to be therapeutic dental materials

Which of the following will accelerate the setting of gypsum products?

Whats considered to be the most reliable means of clinic assess of composite&glass ionomer rest

Chem bond rather than chem means produce retnetion requires _remove and produces a _retentive f

Dental materials considered devices, as well as OTC products, are regulated by ?

What statement is true about impression trays

Wax patterns should be invested within____of carving

What is true concerning chem properties of gypsum materials

Since 2005 the ADA seal of acceptance is awarded to__products

A hazardous chemical is any substance that

Some materials give off heat when mixed this is called?

Colloid

__gloves should be used when mixing pvs putty

Who does the delivery of dental materials most often fall to

Some use a formulated add silicone material in a automatic mix cartridge system to make dies?

Of the 3 types of forces, which is most concerned with stretching of a material?

The first acceptable amalgam formula was developed by ____ in 1895

Until 1970 which of the following of dental auxiliaries were allowed to perform intraoral fxns

What material has the highest ultimate compressive strength?

Exposure to chemicals over a prolonged period of time is ____exposure

What is the amount of change that force has produced if stress is the amount of force exerted

What was the “amalgam war” fought over ?

Addition of powder to dental cement to create a secondary consistency increases the___of cement

An increase in the water to powder rati will result in a ____ accurate model

Which is NOT an application of a materials classification

Which would NOT be made from an alginate impression

Which of the following is an example of a direct restorative material ?

What should be blocked out w utility wax to prevent material from locking under &prevent remove

Complete impression forms a ___reproduction & model forms a ____ replica of teeth

Which of the following is true concerning the ADA seal?

___incorporation of zinc phosphate powder into the liquid mix over a __area of cool glass slab

If eyes are exposed to acids used in dental materials how long do you flush your eyes for?

A substance is defined as being corrosive if the pH is less than__or greater than 12.5

Why is the coefficient of thermal expansion significant in dental materials?

Dual set materials utilize __ setting reactions

Which of the following would not be an adverse effect of a material?

Container of alginate should be turned/flipped. Alginate dust is potentially hazarodous to inha

die of high-strength stone(4) poured w base&adjacent teeth of type__stone

Seal of acceptance

When would one wear a rubber neoprene apron

True of hydrocolloids in dentistry?

Dental plaster begins with___components

Model plaster has a water to powder ratio of approximately ____(mL/g)

Irreversible hydrocolloid

What restorativematerialhas a coefficient of thermalexpansion thermal conduct close to enamel

Which of the following is not a classification of dental materials?

What is the measure of the weight of a material compared with its volume

Ideal gypsum product for full/denture models, ortho model,&cast need higher strength

What is the rxn initiated when a catalyst and a base are mixed together

A properly extended maxillary alginate impression tray will extend post to include ?

Which kind of wax is used to construct the metal framework of partial and complete dentures?

What is the best resource for choosing which dental material to use?

Hardness

Impression taken w polyether should be poured within what time period

What wax is used to adhere components of metal, gypsum, or resin together temporarily

The staining of resins and acrylics from repeated exposure to coffee,tea, etc is due to?

What is true regarding trimming of models with a model trimmer ?

Which statement is truce concerning desirable properties of dental materials

Which is a symptom of acute chem toxicity

If the molecules of a solid are arranged in a random form with no regular pattern,this solid is

what should be considered when choosing an impression tray?

Reverse hydrocolloid

What is true regarding alginate hydrocolloid

What are glass ionomer cements used for ?

Why choose addition silicone over a condensation silicone ?

What is needed to prevent severe injury if phosphoric hydrofluoric or hydrochloric acid issplas

true regarding dimensional accuracy of gypsum products?

Who has the responsibility of assessing hazardous chemicals and passing info to consumers?

Utility wax may be used to

What form of matter has both shape and volume

What elastomer are most hydrophilic

What disinfectant are compatible w addition silicone impression material?

Which part of the chem hazard communication program must describe how chems are handled in work

When proportioning gypsum product powder should be ?

What is NOT a good conductor of temp

Purpose of SDS sheets?

Which of the following dental restorative materials is particularly susceptible to corrosion

Which of the following statements is true regarding hand protection when handling chemicals

In history the earliest recorded mention of restorative dentistry occurs when?

Which kind of wax is used to construct the metal framework of partial and complete dentures?

Silver paste was first mentioned as a restorative material for teeth by the

For a max impression operator stands ___pt at the ___ position

What is true for control of a mercury spill?

What would be considered an indirect placement restorative material?

Cements have___strength&___solubility when compared w other restorative materials

What is true about mixing of plaster and stone materials?

What is the hardest material

Proportional limit

What is the Most widely used dental impression material?

What would excessive expansion of a restorative material result in?

Through which medium is dust generated and inhaled

What material has the lowest level of solubility

masticatory forces on the occlusal surfaces of the molar teeth can increase to as much as lb?

Standards to develop specifications on an international level

Which product requires least amount of mix & will have high final density

Staff training for hazard communication program is required once___for all continuing employees

What cement is powder dispensed in 4-6port on one end of a glass slab?

Higher viscosity the greater is a liquids ability to resist flow viscosity increases temp incre

According to the earliest historical mention, in which location was fluoride first used?

Which of the following is an example of a pattern wax?

Cross contamination from dental materials can be kept to a minimum by?

When should impressions be disinfected?

What is the thermal conductivity of composite resin?

What is Dr. Frederick McKay credited with ?

___refers to the intensity or strength of a color

Which of the following is the best thermal conductor?

What represents standards used to develop specifics & testing on and international level?

Contact between 2 dissimilar metals in the mouth may result in what rxn?

Alginate

Materials that are transferred from larger containers-smaller containers must be labeled using?

What does it mean when freshly mixed gypsum loses its gloss

What particulates are smaller than 5 microns

Toughness

Alginate should be loaded in the impression tray in__increments as___possible

When mix alginate, as water temp increases, work time:

True concerning properties of zinc polycarboxylate cements?