RG Review Questions

When a patient has poor muscle coordination, or poor ridges or when ridges are in crossbite, which denture teeth would most likely be selected?

0 DEGREES NON ANATOMICAL

Irreversible Hydrocolloid impressions should be poured within how long after the impression is taken?

10 MIN

To cure sprinkle technique acrylic properly it must be processed in water at what temperature and for how long?

10-15min 15-20psi

The mesial of tooth number 19 will occlude with teeth numbers:

13,14

10 cc of liquid is equal to:

20CC POWDER BY WEIGHT, 30CC POWDER BY VOLUME, 10 MM

How many classifications of occlusion did Dr. Angle describe?

3

Approximately how many certified dental technicians are there today?

33960

What is the likely result of severely undercontouring the pontic on the framework for a porcelain fused to metal restoration?

A BREAK OR CRACK

After trimming an orthodontic solder joint with a stone or bur, the next step is to use:

A RUBBER WHEEL

What is the purpose of using a custom impression tray?

ACCURACY

What substance is used in tacky liquid that can dissolve wax or plastic partial denture patterns?

ACETONE

What chemicals may be used as an effective wax solvent?

ACETONE MONOMER COMMERCIAL SOLVENT

During burnout, additional rings in the oven require a

ADDITIONAL TIME

What materials received from the dental office must be disinfected?

ALL

Which grinding pattern is used to prepare a noble alloy to receive porcelain?

ALL IN ONE DIRECTION, STRAIGHT, HORIZONTALLY

The screw in a fixed expander should be placed so that it can be activated from:

ANTERIOR TO POSTERIOR

Denatured Alcohol is used in the dental laboratory for what function?

AS A SOLEVANT, AS FOR TORCHES

When is a liquid soap finishing of orthodontic study cast done?

AS THE LAST STEP IN FINISHING

The buccinator muscle is used to

ASSIST MUSCLE OF MASTICATION BY PULLING THE MOUTH BACK

Vacuum and pressure forming machines are used to fabricate:

BASEPLATES, MOUTHGUARD, BLEACH TRAY

Dowel pins in a cast should be set:

BEFORE THE STONE SETS, PARRALLEL TO ONE ANOTHER

What would to be required to articulate cast with an open vertical registration?

BITE REGISTRAION ANF FACEBOW TRANSFER

One method of occlusal registration often used is the:

BITE REGISTRATION

Materials containing ammonia or alcohol will produce harmful gas when mixed with:

BLEACH

Debubblizer is used to

BREAKS SURFACE TENSION, MIN TRAPPED AIR

One of the most common defects found when examining at preliminary impression is:

BUBBLES AND VOIDS

Placing a cast under water is to be avoided, why?

CAUSES WATER ETCHING OF CAST, HYDROSCOPIC EXPANSION

When should final impressions first be disinfected?

CHAIRSIDE

Die spacer is not usually used on the internal walls of the post portion of a post and core die because:

CHANGE THE DIMENSIONS

To protect their skin, technicians may wish to wear polyurethane gloves while processing what:

CHEMICALS, ACRYLIC

What would help maintain proper function of a lathe with a quick chuck?

CLEAN THE MACHINE WEEKLY

The expansion of investment materials provides:

COMPENSATIONG FOR ALLOY SHRINKING

The ball with the condylar element of the semi-adjustable articulator represents the:

CONDYLES OF THE MAND

Muscle tissue accomplishes action through

CONTRACTION, ANTAGONISM

A restoration that covers the entire surface of a tooth's clinical crown is:

CROWN

The lateral component of the compensating curve is called the:

CURVE OF WILSON

A triangular ridge runs from:

CUSP TIP TO THE CENTRAL FOSSA

Wetting agents can also be known as:

DEBUBBILIZER

Gypsum is a very stable product that may be stored in:

DRY AIR TIGHT CONTAINER AT ROOM TEMP

To ensure that a Maxillary cast is mounted in the articulator in the same way that the maxilla relates to the temporomandibular joints, what would be used?

FACEBOW

Use of a plasterless articulator would allow the technician to:

FASTER ARTICULATION, WITH CLASP INSTEAD OF PLASTER, FASTER TO MOUNT AND DISMOUNT

The margin preparation type that requires the least tooth reduction is:

FEATHER

Custom trays should be made to be:

FIT PATIENT EXACTLY, UNIFORM THICKNESS, BEST IMPRESSION MATERIAL

Narrow cracks which may appear in tooth enamel are called:

FRACTURES, ENAMAL CHECK AND CRAZING

The articulator best suited for treating patients with abnormal jaw movement patterns would be a

FULLY ADJUSTABLE

The recommended articulator for the most demanding and complicated cases would be which articulator?

FULLY ADJUSTABLE

Which articulator uses custom ground condyle guides, close simulation of the timing and direction of the Bennett movement, and simulation of the rotating condyle, among other features?

FULLY ADJUSTABLE

What will impart a high luster to Gold?

GRINDIN AND POLISHING, ROUGE

A coil formed by turning a wire around a cylinder is called a:

HELIX

The impression material that is described as being aqueous (combined with water) is:

HYDROCOLLIDS, AGAR, AGAR REVERABILES, ALGINATE

What type of acids will dissolve porcelain?

HYDROFLUORIC

What would the result of rounded margins be caused by

INCORRECT TEMP, or NOT BEING HEAT SOAKED LONG ENOUGH

In a sentence, describe dental waxes?

INDIVIDUAL WAXES OF NATURAL AND SYNTHETIC ORIGINS

When fitting a casting the technician's first step should be to:

INSPECT THE CASTING FOR NODULES

Which impression material must be poured immediately?

IRREVERSIBLE HYDROCOLLOID

Impression plaster used to obtain a bite registration for dentures must have what property?

LOW SETTING EXPANSION, SET UP FASTER, DOWNFALL- WEAK AND BRITTLE

The most peripheral extent of a preparation is known as the:

MARGIN

When mounting complete denture casts on an articulator using a facebow transfer method, the facebow fork is attached to the:

MAXILLARY OCCLUSAL RIM

The torus palatinus is located on the

MIDLINE OF HARD PALATE

A custom acrylic tray is used to

MIN DIMENSIONAL CHANGE OF THE IMPRESSION MATERIAL

What type of gas would most likely be used for a Bunsen burner?

NATURAL GAS

The Certified Dental Technician and Recognize Graduate programs are administered by:

NBC

An articulator that would be considered a "holding" instrument because of its limited function of maintaining vertical and horizontal relations between models is considered to be what kind of articulator?

NON ADJUSTABLE

Name three types of articulator's.

NON ADJUSTABLE, SEMI ADJUSTABLE, FULLY ADJUSTABLE

Gingival inflammation may be caused by crown that is:

NOT CORRECTLY FITTED, INCORRECTLY CONTOURED, OVER STIMULATING TISSUE

Two problems most frequent encountered in the construction of orthodontic clasp are:

NOT ENGAGING IN UNDERCUTS

A patient's vertical dimension of occlusion is held in position with:

OCCLUSION RIM, BITE BLOCKS

By rotating, grinding, and spacing artificial teeth, the technician can improve:

OCCLUSION, ESTHETICS AND FUNCTIONS

The purpose of a facebow is to orient the cast as it relates to the:

ORIENTE THE CAST AS IT RELATES TO THE CONDYLES, CENTRIC OCCLUSION

The muscle attachment site which remains relatively stationary when the muscle acts is the:

ORIGIN

Occupational health and safety laws which apply to dental laboratories are administered by the:

OSHA

A common gas used in the dental laboratory to combine with other gases to increase their combustion temperature is:

OXYGEN

An obturator is:

PROSTHESIS USED TO CLOSE ABNORMAL OPENINGS

What is the following? "To uphold and advance the dignity, honor and efficiency of those engaged as operators of dental laboratories, to advance their standards of service to the dental profession and to establish cooperation among its members".

PURPOSE OF NADL

An occlusal bite registration is used to:

RECORD PATIENTS BITE IN PASSIVE CENTRIC OCCLUSION

A facebow is used to:

RELATE MAXILLA TO THE TMJ

The purpose of a facebow transfer is to orient the:

RELATE THE MAXILLA TO THE TMJ

A depression cut into the patient's abutment teeth in preparation for a partial is referred to as a

REST

Viewed from the occlusal, what is the crown contour of tooth #15?

RHOMBODIAL

If a stone cast is left in contact with an alginate impression after a final set has occurred, the cast may exhibit:

ROUGH OR CHALKY RESIDUE

Custom trays are fabricated from what type of material?

SELF CURING, AUTOPOLYMERIZING, COLD CURE

Because of its usefulness for making all types of removal prosthesis and moderately complicated fixed prosthodontic replacements, which articulator is considered very versatile?

SEMI ADJUSTABLE

Which articulator gives a fair to good simulation of a patient's actual mandibular movements because of its adjustable features?

SEMIADJUSTABLE

What effects the expansion of investment?

SETTING TIME, WATER TO POWDER RATIO, TEMP,

What would be the best instrument to use for creating an enamel check line using an external staining technique?

SHARP INSTRUMENTS, SCAPEL

Acrylic denture investment is best to remove by blasting with

SHELL BLAST, WALNUT SHELL

The butt joint margin is best achieved on which type preparation?

SHOULDER

The primary health hazards posed by investment materials is due to their content of:

SILICA

The first commercial of laboratory was opened in Boston by

STOWE AND EDDY

What is the most likely result of leaving an Agar type impression exposed to the air?

SYNERSIS SHRINKAGE

The muscles of mastication that originates at the temporal fossa and inserts on the coronoid process and ramus of the mandible is the:

TEMPORALIS

What muscle is considered a muscle of mastication?

TEMPORALIS MUSCLE

The Chroma of a color refers to its:

THE COLORS PURITY, SATURTION OF HUE, INTENSITY

Correct burnout temperature of a casting investment helps to control:

THERMAL EXPANSION

Interocclusal records or photographic tracings are used to:

TRACE MAND MOVERMETS, RECORD RELATIONSHIP BETWEEN MAND AND MAX

If looking at the occlusion of a premolar, an imaginary line from cusp tip to cusp tip would represent what?

TRANSVERSE RIDGE

Which light source is best used for the curing process of light cured resins?

UV

The primary purpose of an occlusal rim is to determine the:

VERTICAL DIMENSION

If pouring of the final impression must be delayed, a good choice of impression material would be:

VINYLPOLYSOLIXANE, POLYETHER

The margin on a prepared tooth may be beveled in order to improve:

marginal integrity