RG Exam Questions NADL General Knowledge

If using bleach as a disinfectant in the dental lab, you should dilute 1 part of bleach with___ parts of water

10

If any repair work is done in a dental laboratory, there should be at least _____ separate pumice mix(es) and polishing attachment(s) available for polishing.

2

What is the average condylar angle set to on a fixed-movement articulator?

30 degrees

What is the average horizontal guidance on fixed-movement articulators?

30 degrees

What tooth occludes with tooth #26 when using the Universal tooth numbering system?

7 and 8

Which of the following best describes a convex surface?

A rounded elevation

What is the lamina dura?

A thin layer of dense bone that lines the tooth sockets

What is the primary purpose of a space when fabricating a custom tray?

Allow proper flow of the impression material

The periodontal ligament surrounds the root of the tooth and connects it to what?

Alveolar bone

What does the term fossa refer to?

An anatomical groove or depression

The fibers of the buccinator travel in what direction?

Anterior-posterior

Where on the axial surfaces is a lingual fossae found?

Anteriors

What kind of cleaner should be used to ensure sterilization of hands?

Anti-microbial soap

The mandible and temporal bones are not directly in contact. What separates the mandible from the temporal bone?

Articular disc

What is the location of the synovial cavities?

As part of the TMJ

What is the location of the mental foramen?

At the buccal surface of the mandible

Which muscle is NOT a muscle of mastication? masseter temporal buccinator internal pterygoid

Buccinator

The rear most, upper most unstrained position of the mandible in the articular fossae is

Centric relation

What does the apex of the gothic arch tracing record?

Centric relation

Which of the following alloys is commonly used in the lab for casting dental non-precious ceramic understructures?

Chrome-cobalt

FDA Title 21, Part 820 is the code of federal regulations for

Correct implementation of medical device quality systems

Which anterior has a cusp tip?

Cuspid

The oblique ridge joins what two cusps?

DB and ML

Which of the following is a true statement regarding the properties of dental plaster and dental stone?

Dental plaster products are more porous than dental stone products.

Which of the following dental pros is legally authorized to permanently alter or reshape a patient's tooth?

Dentist

What is iodophor used for?

Disinfecting

Which is the hardest tissue in the mouth?

Enamel

Dental labs are required to implement good manufacturing practices. This requirement is mandated by which agency?

FDA

Which type of articulator has the LEAST amount of lateral movements?

Fixed-guide

Which articulator is recommended for the most complicated cases?

Fully-adjustable

The left maxillary cuspid of the primary teeth is designated what letter?

H

The two diseases specifically addressed by the OSHA Blood borne Pathogen Standard are

HIV and HBV

The most important requirement for a solder is that it must

Have a lower melting range that the parent metal

What is the purpose of tissue stops in a custom tray?

Helps determine when the tray is fully seated against the tissue

Laboratory personnel who, by nature of their job duties may be exposed to bodily fluids must be offered vaccination against

Hep B

The two purely vertical movements of the mandible, elevation and depression, have the same movement in each joint and are also known as

Hinge movements

Which commonly used group of dental disinfectants has a residual effect that continues to kill pathogens even after it is applied?

Iodophors

Transverse ridge refers to a ridge that

Is an elevation in the central groove where one cusp meets another.

Which of the following is true regarding the lingual developmental groove?

It divides the lingual of molars into two cusps

Which statement below regarding the Curve of Spee is correct?

It is the anterior-posterior curvature of the occlusal surfaces of mandibular teeth

On which side of the anterior teeth is a cingulum found?

Lingual

From the occlusal view, which tooth or teeth are generally expected to have a trapezoid shaped outline?

Lower first molars

Which tooth has four cusps of about equal size?

Mandibular 2nd molar

which of the following teeth can be characterized with one or two lingual cusps? mandibular 1st premolar mandibular 2nd premolar mandibular 1st molar mandibular 2nd molar

Mandibular 2nd premolar

Which tooth most commonly would be seen to have two buccal developmental grooves?

Mandibular first molar

Which are the first permanent teeth to erupt?

Max or mand first molars

What is a facebow used to mount?

Maxillary casts only

Which tooth has the greatest mesial-distal width?

Maxillary central

Which premolar commonly has a bifurcated root?

Maxillary first

Where is the marginal ridge found?

Mesial and distal occlusal surfaces of posteriors only

where is the cusp of carabelli found on the linguals of the maxillary?

Molars

Which statement best describes the movements in the TMJ during centric occlusion, protrusion, and retrusion?

Movements occur bilaterally simultaneously and in the same direction

The mesial contact on a maxillary central is

Near the junction of the incisal and middle thirds

The biting surface of the posterior teeth is referred to as what?

Occlusal

When the mandible is in physiological rest position, the:

Occlusal surfaces of the max and mand teeth have no contact

Where are mamelons found?

On the incisal edge of un-worn teeth

Which of the following impression materials can be poured up to 7 days after it is used?

Polyvinyl siloxane

Where are triangular fossae found?

Posteriors

Permanent premolars replace which teeth?

Primary molars

What is the innermost tissue of the living tooth called?

Pulp

One half of the mandibular dental arch is referred to as what?

Quadrant

What shape does the maxillary 1st molar have from an occlusal view?

Rhomboidal

What which of the following is NOT one of the three classifications of impressions? preliminary secondary final occlusal

Secondary

Which of the following is a common mistake when pouring impression that may cause loss of detail in the cast?

Set vibrator too high

On most posterior teeth, where is the distal marginal ridge situated?

Slightly more cervically than mesial marginal ridge

In most states, which of the following dental pros can work without being DIRECTLY supervised by the dentist?

Technician

The condyle of the mandible fits into the mandibular fossa of the

Temporal bone

Which of the following statement is true regarding oblique ridges?

They are found only on maxillary molars

Which of the following statements is true regarding killing the viral pathogens that cause AIDS and Hepatitis B?

They can only be destroyed by autoclaving

What is the purpose of a sandblasting unit?

To remove investment and oxide residue from castings

What is the name for the place where two triangular ridges come together in the central groove?

Transverse ridge

Which of the following best describes the lingual cusps on the mandibular second premolar?

Under developed

How long can Hepatitis virus stay alive on a cast or appliance?

Weeks

Where does the masseter muscle attach to the skull?

Zygomatic arch

Pumice used on repairs and relines must be changed

after each use

Which impression material would NOT be acceptable for a final impression for a case involving a fixed partial denture?

alginate

Marginal ridges form the mesial and distal borders f

anterior and posterior teeth

Marginal ridges form the mesial and distal borders of

anterior and posterior teeth

What is the slight side-shift of the mandible in the mandibular fossa referred to as?

bennett movement

Micro organisms such as viruses or bacteria that are carried in the blood are called

blood borne pathogens

From an occlusal view, the distal contact of the maxillary first molar is:

buccal to the central groove

What is the term for a dental restoration that fits over a full prepared tooth and is secured by cement?

crown

What are the major elevations on the chewing surfaces of all posterior teeth called?

cusps

Dental appliances sent from the laboratory to the dental office should be shipped in

diluted mouth wash

Which of the following is a cranial bone?

frontal

Overjet is defined as

horizontal space

When a dental impression is received in the lab, it should be handled first with

latex gloves

The centers of formation (of which there are 4 or more in each tooth) are called

lobes

The universal numbering system starts with tooth 1 as the

maxillary right 3rd molar

Where are the mesial and distal contacts on the maxillary first premolar located?

more occlusal mesially than distally

Where is a triangular ridge found?

on each posterior cusp

The palatine fovea are

on either side of the midline on or near the vibrating line

An occlusal bite registration should be trimmed so that it

only covers the prepared tooth or teeth

What statement is MOST correct as it relates to mastication of food?

opposing teeth seldom contact during mastication

What type of articulator only adjusts lateral and protrusive guidance?

semi-adjustable

The process of changing from a mixture of powder and water to a solid is BEST described as

setting

Which of the following abrasives is recommended for the general shaping of fired porcelains?

sintered diamond

How many mandibular teeth typically contact a maxillary central incisor in centric occlusion?

two

From the occlusal view, which tooth or teeth are generally expected to be "rhomboidal" in shape?

upper molars