EFDA PRACTICE QUESTIONS WITH
CORRECT ANSWERS
In the Federation Dentaire International System for numbering, the first number represents a
_________, while the second number represents a _________. - CORRECT ANSWER -quadrant,
tooth
What is the visible portion of the anatomical crown known as? - CORRECT ANSWER -the clinical
crown
The area where the roots divide - CORRECT ANSWER -furcation
The point or area where approximating teeth in the same arch touch or meet each other is
referred to as the ________. - CORRECT ANSWER -contact area
Where are the TWO purposes of contact areas? - CORRECT ANSWER --to keep food from
packing between the teeth
-help stabilize the dental arches
Coronal to the actual division into two or more roots is a concavity that extends to or nearly to
the CEJ. This concavity is called - CORRECT ANSWER -the furrow
What is the HARDEST tissue in the body? - CORRECT ANSWER -enamel
What cells form enamel? - CORRECT ANSWER -ameloblasts
The bulk of the tooth is made up of - CORRECT ANSWER -dentin
,In permanent teeth, the process of enamel formation is completed about ___ years before
eruption. - CORRECT ANSWER -3
What is the composition of enamel? - CORRECT ANSWER -95% inorganic matter, 5% organic
matter and water
What is the SECOND hardest material in the body? - CORRECT ANSWER -dentin
What is the composition of dentin? - CORRECT ANSWER -70% inorganic, 20% organic, 10%
water
The three major types of dentin - CORRECT ANSWER -primary, secondary, reparative
What type of dentin is a DEFENSE reaction to an area of injury? - CORRECT ANSWER -reparative
dentin
What has the HIGHEST fluoride content of all the materialized tissue? - CORRECT ANSWER -
cementum
The two types of cementum - CORRECT ANSWER -acellular and cellular
What type of cementum ACTIVELY produces new layers of cementum throughout the life of the
tooth? - CORRECT ANSWER -cellular
What teeth have the cusp of Carabelli? - CORRECT ANSWER -maxillary first molars
The ridge formed by the union of two triangular ridges - CORRECT ANSWER -transverse ridge
, The spillway provides an escape for food from the _______ surface during the mastication
(chewing) process. - CORRECT ANSWER -occlusal
The uncut tooth structure adjacent to the cavity prep - CORRECT ANSWER -cavosurface
line angle - CORRECT ANSWER -two walls
point angle - CORRECT ANSWER -three walls
A thin soft tissue that is loosely attached to the underlying bone - CORRECT ANSWER -alveolar
mucosa
T or F
Undue stress continually placed on the body can contribute to lower back pain, circulatory
problems, muscle aches, and tension - CORRECT ANSWER -True
When seated, the thighs should be _______ to the floor - CORRECT ANSWER -parallel
The chair is raised or lowered to achieve ____ to ____ inches distance between the patient's
face and the operator's face - CORRECT ANSWER -12 to 14
The back of the patient chair is raised until its angle to the floor is ______ degrees - CORRECT
ANSWER -25-45
The three basic parts of an instrument are - CORRECT ANSWER -the working end, shank, and
handle
CORRECT ANSWERS
In the Federation Dentaire International System for numbering, the first number represents a
_________, while the second number represents a _________. - CORRECT ANSWER -quadrant,
tooth
What is the visible portion of the anatomical crown known as? - CORRECT ANSWER -the clinical
crown
The area where the roots divide - CORRECT ANSWER -furcation
The point or area where approximating teeth in the same arch touch or meet each other is
referred to as the ________. - CORRECT ANSWER -contact area
Where are the TWO purposes of contact areas? - CORRECT ANSWER --to keep food from
packing between the teeth
-help stabilize the dental arches
Coronal to the actual division into two or more roots is a concavity that extends to or nearly to
the CEJ. This concavity is called - CORRECT ANSWER -the furrow
What is the HARDEST tissue in the body? - CORRECT ANSWER -enamel
What cells form enamel? - CORRECT ANSWER -ameloblasts
The bulk of the tooth is made up of - CORRECT ANSWER -dentin
,In permanent teeth, the process of enamel formation is completed about ___ years before
eruption. - CORRECT ANSWER -3
What is the composition of enamel? - CORRECT ANSWER -95% inorganic matter, 5% organic
matter and water
What is the SECOND hardest material in the body? - CORRECT ANSWER -dentin
What is the composition of dentin? - CORRECT ANSWER -70% inorganic, 20% organic, 10%
water
The three major types of dentin - CORRECT ANSWER -primary, secondary, reparative
What type of dentin is a DEFENSE reaction to an area of injury? - CORRECT ANSWER -reparative
dentin
What has the HIGHEST fluoride content of all the materialized tissue? - CORRECT ANSWER -
cementum
The two types of cementum - CORRECT ANSWER -acellular and cellular
What type of cementum ACTIVELY produces new layers of cementum throughout the life of the
tooth? - CORRECT ANSWER -cellular
What teeth have the cusp of Carabelli? - CORRECT ANSWER -maxillary first molars
The ridge formed by the union of two triangular ridges - CORRECT ANSWER -transverse ridge
, The spillway provides an escape for food from the _______ surface during the mastication
(chewing) process. - CORRECT ANSWER -occlusal
The uncut tooth structure adjacent to the cavity prep - CORRECT ANSWER -cavosurface
line angle - CORRECT ANSWER -two walls
point angle - CORRECT ANSWER -three walls
A thin soft tissue that is loosely attached to the underlying bone - CORRECT ANSWER -alveolar
mucosa
T or F
Undue stress continually placed on the body can contribute to lower back pain, circulatory
problems, muscle aches, and tension - CORRECT ANSWER -True
When seated, the thighs should be _______ to the floor - CORRECT ANSWER -parallel
The chair is raised or lowered to achieve ____ to ____ inches distance between the patient's
face and the operator's face - CORRECT ANSWER -12 to 14
The back of the patient chair is raised until its angle to the floor is ______ degrees - CORRECT
ANSWER -25-45
The three basic parts of an instrument are - CORRECT ANSWER -the working end, shank, and
handle
