EFDA Practice Questions and Answers
with solutions
In the Federation Dentaire International System for numbering, the first number represents a
_________, while the second number represents a _________. - ANSWER quadrant, tooth
What is the visible portion of the anatomical crown known as? - ANSWER the clinical crown
The area where the roots divide - ANSWER furcation
The point or area where approximating teeth in the same arch touch or meet each other is
referred to as the ________. - ANSWER contact area
Where are the TWO purposes of contact areas? - 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 - ANSWER the furrow
What is the HARDEST tissue in the body? - ANSWER enamel
What cells form enamel? - ANSWER ameloblasts
The bulk of the tooth is made up of - ANSWER dentin
,In permanent teeth, the process of enamel formation is completed about ___ years before
eruption. - ANSWER 3
What is the composition of enamel? - ANSWER 95% inorganic matter, 5% organic matter and
water
What is the SECOND hardest material in the body? - ANSWER dentin
What is the composition of dentin? - ANSWER 70% inorganic, 20% organic, 10% water
The three major types of dentin - ANSWER primary, secondary, reparative
What type of dentin is a DEFENSE reaction to an area of injury? - ANSWER reparative dentin
What has the HIGHEST fluoride content of all the materialized tissue? - ANSWER cementum
The two types of cementum - ANSWER acellular and cellular
What type of cementum ACTIVELY produces new layers of cementum throughout the life of the
tooth? - ANSWER cellular
What teeth have the cusp of Carabelli? - ANSWER maxillary first molars
The ridge formed by the union of two triangular ridges - ANSWER transverse ridge
The spillway provides an escape for food from the _______ surface during the mastication
(chewing) process. - ANSWER occlusal
, The uncut tooth structure adjacent to the cavity prep - ANSWER cavosurface
line angle - ANSWER two walls
point angle - ANSWER three walls
A thin soft tissue that is loosely attached to the underlying bone - 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 - ANSWER True
When seated, the thighs should be _______ to the floor - ANSWER parallel
The chair is raised or lowered to achieve ____ to ____ inches distance between the patient's
face and the operator's face - ANSWER 12 to 14
The back of the patient chair is raised until its angle to the floor is ______ degrees - ANSWER
25-45
The three basic parts of an instrument are - ANSWER the working end, shank, and handle
When seated, the lower legs should be _______ to the floor - ANSWER perpendicular
If the operator needs to lean forward, it should be done by bending at the - ANSWER hips or
neck
with solutions
In the Federation Dentaire International System for numbering, the first number represents a
_________, while the second number represents a _________. - ANSWER quadrant, tooth
What is the visible portion of the anatomical crown known as? - ANSWER the clinical crown
The area where the roots divide - ANSWER furcation
The point or area where approximating teeth in the same arch touch or meet each other is
referred to as the ________. - ANSWER contact area
Where are the TWO purposes of contact areas? - 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 - ANSWER the furrow
What is the HARDEST tissue in the body? - ANSWER enamel
What cells form enamel? - ANSWER ameloblasts
The bulk of the tooth is made up of - ANSWER dentin
,In permanent teeth, the process of enamel formation is completed about ___ years before
eruption. - ANSWER 3
What is the composition of enamel? - ANSWER 95% inorganic matter, 5% organic matter and
water
What is the SECOND hardest material in the body? - ANSWER dentin
What is the composition of dentin? - ANSWER 70% inorganic, 20% organic, 10% water
The three major types of dentin - ANSWER primary, secondary, reparative
What type of dentin is a DEFENSE reaction to an area of injury? - ANSWER reparative dentin
What has the HIGHEST fluoride content of all the materialized tissue? - ANSWER cementum
The two types of cementum - ANSWER acellular and cellular
What type of cementum ACTIVELY produces new layers of cementum throughout the life of the
tooth? - ANSWER cellular
What teeth have the cusp of Carabelli? - ANSWER maxillary first molars
The ridge formed by the union of two triangular ridges - ANSWER transverse ridge
The spillway provides an escape for food from the _______ surface during the mastication
(chewing) process. - ANSWER occlusal
, The uncut tooth structure adjacent to the cavity prep - ANSWER cavosurface
line angle - ANSWER two walls
point angle - ANSWER three walls
A thin soft tissue that is loosely attached to the underlying bone - 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 - ANSWER True
When seated, the thighs should be _______ to the floor - ANSWER parallel
The chair is raised or lowered to achieve ____ to ____ inches distance between the patient's
face and the operator's face - ANSWER 12 to 14
The back of the patient chair is raised until its angle to the floor is ______ degrees - ANSWER
25-45
The three basic parts of an instrument are - ANSWER the working end, shank, and handle
When seated, the lower legs should be _______ to the floor - ANSWER perpendicular
If the operator needs to lean forward, it should be done by bending at the - ANSWER hips or
neck
