Dental Lab Assessment Exam Review

The "Cusp of Carabelli" is found on the

Lingual on the maxillary first molar

Which of the following teeth have an oblique ridge?

Maxillary 1st and 2nd molars

A technician is establishing a Curve of Spee for a semi anatomical tooth. The only cusp of the maxillary first molar that would contact the occlusal plane is the

Mesio lingual

When looking at a tooth from the facial (buccal), aspect the tooth has three buccal cusps, with the smallest of the three cusps on the right. This tooth is a __________ first molar

Mandibular left first molar

The three parts of the crown portion of an anterior tooth are

Cervical

Middle

Incisal

A "central" develops from ________ anterior developmental lobes

3

Overjet is defined as

Horizontal overlap of the maxillary anteriors, over the mandibular maxillary anteriors

A "class 1" (normal bite) posterior relationship should be set in a

Maxillary lingual cusp occludes in the mandibular central fossa (middle of the tooth)relationship

Protrusion movement is the

Forward movement of the mandibular jaw

lateral excursion is the

Side to side movement of the mandibular jaw

1mm overjet, 1mm overbite is a

Class 1 relation

Overbite is the

Vertical overlap of maxillary anteriors over mandibular anteriors

The compensating curve is a

Natural curvature of the maxillary mandibular posterior that is found in all natural detentions

Plaster and stone are from which of the following product families?

Gypsum

To accelerate (speed up) the gypsum setting time _______ is added to the mixture

Salt

Containers of certain dental material should be shaken before opening to

Get a homogeneous mix

Anatomy of the crown must be completed

Before the final gaze

Which of the following gives the glazing process additional life?

Stains

The purpose of wetting agents such as debubblizer is to

Reduce the surface tension

Non precious metal is ready to cast when it

Slumps and looses its shape

Some metal substructure or copings, which will have porcelain bonded to them, are sandblasted with

Aluminum oxide blasting compound

Which of the following types of metal has the higher melting point ?

Non precious metal

Why would a veneer crown (3/4 metal, 1/4 porcelain) be used over a full porcelain crown (porcelain over metal)?

Aesthetics

What are ceramic alloys used for?

Full cast crowns

A Hawley retainer has

A labial bow, and a clasped that are buried into the acrylic palate

Clasps are engaged in

Undercuts which lock under tooth

Bands are used for

Anchoring wire in fixed orthodontics

A palatal expander is responsible for

Widening the arch form

"Adams", "circumferential" and "ball" are all examples of _____ clasps

Retentive

The palate of a hawley retainer is fabricated out of

Acrylic

The hawley retainer is intended to

Maintain position of teeth

Which of the following statement is correct about the gauges of wire?

The higher the gauging number the thicker the wire

Lab cases that are received into the laboratory must be disinfected with a _________ level disinfectant

High

Which of the following characteristics would be the most useful for a dental laboratory technician to have?

Excellent manual dexterity and awareness of detail

The technician should wear ________ when using a separating disc to cut away any material

Safety glasses

When receiving cases from the dentist the proper attire is

Face shield

Lab coat

Rubber gloves

According to OSHA lab cases are to be disinfected by the

Lab technician, before the cases returns to the dentist

The disinfectant of choice to disinfect impressions and models contain

Phenols

An alloy is

Combination of metals

When casting wax or inlay cools, it

Contracts and shrinks

Finishing a non-precious alloy would require a ______ handpiece

high speed

To prepare metal for use with porcelain,finish the metal by

using aluminous oxide boat and distilled water in the ultrasonic cleaner

During flasking, before the second stage is vibrated onto the first stage of investing a

Die lube separator is applied to all gypsum areas

During the boil out stage which of the following could cause the teeth to pop loose from the mold?

Too much wax residue left on the teeth from festooning

Denture base acrylics have a "normal" cured process of placing flasks in water for

9 hours at 165 degrees Fahrenheit

Which of the following types of artificial teeth have retention pins in them?

porcelain anteriors

After denture recovery (deflasking the dentures) the next step is

Removing excess stone and plaster off surrounding teeth

The post dam seal should extend from the

Hammular notch, through soft tissue and vibrating line to hammular notch

Occlusal errors are produced in denture during the flasking and process. These errors are removed through remounting the dentures by the

Laboratory technician, before finishing and delivery to the dentist

Balancing occlusion occurs simultaneously on the opposite side from the

Working side

The main purpose of stippling is to

Add additional character to the denture

Tripoli is a

High shine polish

The _____ defines the soft and hard palate of the maxillary denture

Vibrating line

A quadrant impression is a

Quarter of an arch

The three parts of the posterior tooth are:

Cervical

Middle

Occlusal

The contact point on a tooth is always located on the _____ surface.

Mesial

The only teeth that touch the same surface of another tooth are the

Centrals

A space found between the contact areas of two teeth is called a

Diastema

The cervical portion of a tooth touches the ____tissue

Gingival

The incisive papilla is located

Behind the maxillary central incisors

The retromolar pad is located

Distal to the last mandibular third molar

The largest muscle in the skull is the

Temporal muscle

The type of bone spurting the teeth is called the ____ bone

alveolar

The maxilla contacts the nasal, temporal and ____ bone

Zygomatic

The mandible is formed by two bones fusing at the

Ramus

A buccal surface would most likely be found on a

Lower bicuspid

The lingual lobe, closest to the gingival tissue of an anterior tooth is called a

Cingulum

The most widely used numbering system is the ____ system

Universal

An adult dentition is called

Permanent

Using the Universal numbering system #8 is a

Maxillary right central

Which gypsum material is preferred for pouring a preliminary impression?

Stone

The purpose of making custom trays is to

Enable a more accurate,customized impression to be made by dentists

The technician uses the ______ landmarks to help place a post dam

Hamular notch, palatine fovea, and tuberosities

The first step in a dentist's treatment plan is to

Take an alginate impression in a stock tray

Boxing and beading is done on the the

Secondary impression custom tray

What type of impression material would be used in a secondary impression tray?

Polyvinylsiloxane

When fabricating a custom tray for an immediate denture,

Never block out the teeth that will be extracted.

Secondary impressions for master casts for complete dentures are poured in

Dental stone

The technician should _______ the impression after its arrival in the laboratory and before pouring gypsum into the impression

Disinfect

The baseplate used for bite registration and set up must be made

On the master cast

When fabricating a baseplate and rim for an "immediate denture" for vertical registration the

Baseplate is cut around the natural teeth

Which of the following is a function of occlusion rims?

Recording vertical dimension

Mandibular occlusal rim should be ____ high

18mm

The height of a maxillary occlusal rim at the anterior should be

22mm

An articulators movement are determined by the

Design of the articulator

The device that simulates the movement of the jaw is a

Articulator

The pin on the articulator provides

A stop for the vertical dimension opening

Casts are most easily articulated using

Keys in the model and a thick mix of plaster

Teeth set for "try-in" are usually set

With centric occlusion, protrusive, working and balancing, and in all lateral excursions

Immediate dentures are made for patients who

Have compromised natural teeth that need to be removed

When ordering teeth, a "1 x 16" would refer to

Upper and lower posteriors

Festooning the denture results in

A duplicate of what is desired in the processed finished denture

Long, narrow crest (linear elevation) on the surface of a tooth

Ridge

Arch to arch relationship of mandible when condyles are in their most upward position mandible is in its most posterior position and jaw is most braced by its musculature

Centric Relation

Junction of 3 surfaces

Line Angle

Small nodule (elevation) of enamel

Tubercle

Pinpoint depression at the junction of 2 or more developmental grooves

Pit

Line angle —> junction of 2 surfaces

False

Malocclusion—> socket in the alveolar bone in which the root if the tooth is held

False

Cusp-to-fossa -> where 2 adjacent teeth touch

False