Dental Assisting Final (Ch. 43-64 Multiple Choice)

The size of the wax spatula most commonly used in the laboratory is a

#7

The powder (g)/water (ml) ratio of plaster for pouring a dental model is

100/50

The powder/water ratio for maxillary preliminary impression is

3 scoops of powder to 3 measure of water

How long should you wait before you separate a model from its impression?

45 to 60 minutes

Of the three types of custom trays discussed in the chapter, which technique uses a volatile hazardous material?

Acrylic resin

Which material would be selected for the fabrication of provisional coverage?

Acrylic resin

When a gypsum material is mixed, how is the powder and water incorporated?

Add powder to the water

Irreversible hydrocolloid material is also referred to as

Alginate

Which of the following terms is a description of a certain portion of a dental model?

Anatomic, Art

What is the one specific area of a dental model where the maxillary and mandibular models are trimmed differently?

Anterior portion

Elastomeric materials are intended for what type of impression?

Final

Which specialty practice might have a more extensive laboratory setup?

Fixed prosthodontics, Orthodontics

What type of tray is most commonly selected when zinc oxide-eugenol bite registration material is used?

Gauze

At the completion of the process for mixing polycarboxylate cement, the end product should appear

Glossy

The three noble metals used in making indirect restorations are

Gold, palladium, and platinum

What dental material is used in the creation of a dental model?

Gypsum

Which type of gypsum is used to fabricate a die for making an indirect restoration?

High-strength stone

Which variable can affect the addition or loss of water in a material?

Humidity

What temporary restorative material would be selected for a Class II cavity preparation?

IRM

An example of a contaminated item that could be found in the dental lab would be a(n)

Impression

What is used to triturate capsulated dental materials?

In an air-tight container

Where are amalgam scraps disposed of?

In an air-tight container

Where would you commonly find the lab in a dental office?

In proximity to the clinical operatory

How is self-cured acrylic resin supplied for the fabrication of custom trays?

Powder and liquid

Of the three classification of impressions, which of these could be an expanded function for the certified dental assistant?

Preliminary, Final

The purpose of a dental liner is to

Protect the pulp from any type of irritation

For which of the following procedures would you include a temporary cement on the tray setup?

Provisional coverage

A base is placed in or on the ______________ in a cavity preparation

Pulpal floor

Which type of stock tray would be selected and prepared to cover half of an arch?

Quadrant

While the dentist is dispensing the syringe material around the prepared tooth, what should the dental assistant be doing during a final impression procedure?

Readying the tray with heavy-body material

Why would you select a fast-set alginate when taking a preliminary impression?

The patient has a strong gag refelx

What type of custom tray would be made for a vital bleaching procedure?

Thermoplastic resin

On what type of mixing pad is ZOE mixed?

Treated paper pad

Temp bond is supplied as

Two tubes of paste

What type of zinc oxide-eugenol (ZOE) is used for permanent cementation?

Type II

How do you dissipate the heat from zinc phosphate in the mixing process?

Use a cool glass slab

The final step in finishing a composite resin is

Use of a rubber cup and polishing paste

_______________ would be used to extend the length of a tray to accommodate third molars.

Utility wax

Which supplemental material is contraindicated under composite resins and glass ionomer restorations?

Varnish

Baseplate wax is _______________ before being placed in the patient's mouth for a bite registration

Warmed

Hydro- means

Water

What should be placed between the two models during trimming?

Wax bite

Which type of tray is constructed to fit the mouth of a specific patient?

Custom

How is the light-body impression material applied during the final impression procedure?

Extruder with tip

Which piece of lab equipment would the dentist use to determine centric relation from a diagnostic model?

Face bow

Which professional organization evaluates a new dental material?

ADA

The term commonly used to refer to dimethacrylate is

BIS-GMA

What type of wax is used to obtain a patient's bite?

Baseplate wax

__________________ is the material universally used for taking a bite registration

Baseplate wax

Of the three classification of impressions, which would be used by the dental lab tech for determining occlusal relationship?

Bite registration

The purpose of a dental bonding material is to

Bond restorative materials to the tooth structure

What type of wax is used to form a barrier around a preliminary impression when it is poured up?

Boxing wax

How does an auto-cured material harden or set?

By chemical reaction

What unique ingredient in the powder of glass ionomer cement helps inhibit recurrent decay?

Calcium

Another term for decay is

Cavity

What type of reaction does a dental material undergo when a person is chewing?

Compressive stress

What dental instrument is selected to press a base into the cavity preparation?

Condenser

Where would reversible hydrocolloid material be placed prior to taking the impression?

Conditioning bath

What happens to a dental material when it is exposed to extreme temperatures of hot and then cold?

Contraction and expansion

Another name for a dental model is

Dental cast

Calcium hydroxide is placed on what tooth structure?

Dentin

What does the dentin sealer seal?

Dentin tubules

In light-curing of composite resins, which factor can affect curing time of the material?

Depth or extent of restoration

Why is dental amalgam not placed in anterior teeth?

Esthetics

What type of restoration is always made in a dental laboratory setting?

Indirect restoration

Which viscosity of a final impression material is applied first to the prepared tooth or teeth?

Light body

Which sequence is recommended for the application of supplementary materials for a deep restoration?

Liner, base, dentin, sealer, bonding system

Which filler type of composite resin has the strongest makeup and has been used most commonly for posterior restorations?

Macrofilled

Which model (maxillary or mandibular) should you begin trimming first?

Maxillary

On or in what is irreversible hydrocolloid material mixed?

Mixing pad

Which piece of lab equipment would be used to grind away plaster or stone?

Model trimmer

When pouring-up impression, where would you begin placing the gypsum material in a mandibular impression?

Most posterior teeth

An impression would be considered a

Negative reproduction

Restorative dentistry is often referred to as

Operative dentistry

______________________ is/are (an) example(s) of an enamel bonding procedure

Orthodontic brackets, Sealants

How is a elastomeric material supplied?

Paste, Cartridge, Putty

Which type of impression tray allows the impression material to mechanically lock on?

Perforated

The main component in the liquid of zinc phosphate is

Phosphoric acid

Which statement is not one of calcium hydroxide's characteristics?

Replaces the need for a dentin sealer

A preliminary impression is _____________ before being transported to the lab for pouring up.

Rinsed, disinfected, wrapped in a moist paper towel, and placed in a precautionary bag

To extend an impression tray, what type of wax is used?

Rope utility wax

Another name for polysulfide is

Rubber base

Which is an example of how galvanic action can occur?

Salt within saliva, Touching of two metals

The organic substance of hydrocolloid material is

Seaweed

What is used to determine the color of composite resin material for a procedure?

Shade guide

Select the correct makeup of the alloy powder in amalgam

Silver, tin, copper, and zinc

If the powder of a dental material is dispersed in increments, what size increment is commonly brought into the liquid first?

Smallest

What is removed from tooth structure before a bonding material is placed on dentin?

Smear layer

What effect does eugenol have on the pulp?

Soothing

What can be placed to prevent a tray from seating too deeply onto the arch or quadrant?

Spacer stops

What additional method can be used to mix final impression material instead of using an extruder?

Spatula and pad

Most amalgams have a high copper content. What does copper provide to amalgam restorations?

Strength, Corrosion resistance

How is the liquid portion of polycarboxylate cement supplied?

Supplied

Can a glass ionomer material be used as a restorative material?

Yes

Can a resin cement be used with a metal casting?

Yes

Another name for dentin sealer is

desensitizer

The acronym IRM stands for

intermediate restorative material

Another name used to describe permanent cement is

luting agent

An insulating base is placed to

protect the pulp from thermal shock

The key ingredient in varnish is

resin