EFDA PRACTICE QUESTIONS | COMPREHENSIVE STUDY GUIDE, EXAM
QUESTIONS AND ANSWERS 2026/2027
In the Federation Dentaria International System for numbering, the first number represents a
_________, while the second number represents a _________. - ANS ✔✔quadrant, tooth
What is the visible portion of the anatomical crown known as? - ANS ✔✔the clinical crown
The area where the roots divide - ANS ✔✔furcation
The point or area where approximating teeth in the same arch touch or meet each other is
referred to as the ________. - ANS ✔✔contact area
Where are the TWO purposes of contact areas? - ANS ✔✔-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 - ANS ✔✔the furrow
What is the HARDEST tissue in the body? - ANS ✔✔enamel
What cells form enamel? - ANS ✔✔ameloblasts
The bulk of the tooth is made up of - ANS ✔✔dentin
In permanent teeth, the process of enamel formation is completed about ___ years before
eruption. - ANS ✔✔3
,What is the composition of enamel? - ANS ✔✔95% inorganic matter, 5% organic matter and
water
What is the SECOND hardest material in the body? - ANS ✔✔dentin
What is the composition of dentin? - ANS ✔✔70% inorganic, 20% organic, 10% water
The three major types of dentin - ANS ✔✔primary, secondary, reparative
What type of dentin is a DEFENSE reaction to an area of injury? - ANS ✔✔reparative dentin
What has the HIGHEST fluoride content of all the materialized tissue? - ANS ✔✔cementum
The two types of cementum - ANS ✔✔acellular and cellular
What type of cementum ACTIVELY produces new layers of cementum throughout the life of the
tooth? - ANS ✔✔cellular
What teeth have the cusp of Carabelli? - ANS ✔✔maxillary first molars
The ridge formed by the union of two triangular ridges - ANS ✔✔transverse ridge
The spillway provides an escape for food from the _______ surface during the mastication
(chewing) process. - ANS ✔✔occlusal
The uncut tooth structure adjacent to the cavity prep - ANS ✔✔cavosurface
, line angle - ANS ✔✔two walls
point angle - ANS ✔✔three walls
A thin soft tissue that is loosely attached to the underlying bone - ANS ✔✔alveolar mucosa
T or F
Undue stress continually placed on the body can contribute to lower back pain, circulatory
problems, muscle aches, and tension - ANS ✔✔True
When seated, the thighs should be _______ to the floor - ANS ✔✔parallel
The chair is raised or lowered to achieve ____ to ____ inches distance between the patient's
face and the operator's face - ANS ✔✔12 to 14
The back of the patient chair is raised until its angle to the floor is ______ degrees - ANS ✔✔25-
45
The three basic parts of an instrument are - ANS ✔✔the working end, shank, and handle
When seated, the lower legs should be _______ to the floor - ANS ✔✔perpendicular
If the operator needs to lean forward, it should be done by bending at the - ANS ✔✔hips or
neck
What will increase visibility to the lingual surfaces of the mandibular anterior teeth? - ANS
✔✔having the patient tilt their chin down
QUESTIONS AND ANSWERS 2026/2027
In the Federation Dentaria International System for numbering, the first number represents a
_________, while the second number represents a _________. - ANS ✔✔quadrant, tooth
What is the visible portion of the anatomical crown known as? - ANS ✔✔the clinical crown
The area where the roots divide - ANS ✔✔furcation
The point or area where approximating teeth in the same arch touch or meet each other is
referred to as the ________. - ANS ✔✔contact area
Where are the TWO purposes of contact areas? - ANS ✔✔-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 - ANS ✔✔the furrow
What is the HARDEST tissue in the body? - ANS ✔✔enamel
What cells form enamel? - ANS ✔✔ameloblasts
The bulk of the tooth is made up of - ANS ✔✔dentin
In permanent teeth, the process of enamel formation is completed about ___ years before
eruption. - ANS ✔✔3
,What is the composition of enamel? - ANS ✔✔95% inorganic matter, 5% organic matter and
water
What is the SECOND hardest material in the body? - ANS ✔✔dentin
What is the composition of dentin? - ANS ✔✔70% inorganic, 20% organic, 10% water
The three major types of dentin - ANS ✔✔primary, secondary, reparative
What type of dentin is a DEFENSE reaction to an area of injury? - ANS ✔✔reparative dentin
What has the HIGHEST fluoride content of all the materialized tissue? - ANS ✔✔cementum
The two types of cementum - ANS ✔✔acellular and cellular
What type of cementum ACTIVELY produces new layers of cementum throughout the life of the
tooth? - ANS ✔✔cellular
What teeth have the cusp of Carabelli? - ANS ✔✔maxillary first molars
The ridge formed by the union of two triangular ridges - ANS ✔✔transverse ridge
The spillway provides an escape for food from the _______ surface during the mastication
(chewing) process. - ANS ✔✔occlusal
The uncut tooth structure adjacent to the cavity prep - ANS ✔✔cavosurface
, line angle - ANS ✔✔two walls
point angle - ANS ✔✔three walls
A thin soft tissue that is loosely attached to the underlying bone - ANS ✔✔alveolar mucosa
T or F
Undue stress continually placed on the body can contribute to lower back pain, circulatory
problems, muscle aches, and tension - ANS ✔✔True
When seated, the thighs should be _______ to the floor - ANS ✔✔parallel
The chair is raised or lowered to achieve ____ to ____ inches distance between the patient's
face and the operator's face - ANS ✔✔12 to 14
The back of the patient chair is raised until its angle to the floor is ______ degrees - ANS ✔✔25-
45
The three basic parts of an instrument are - ANS ✔✔the working end, shank, and handle
When seated, the lower legs should be _______ to the floor - ANS ✔✔perpendicular
If the operator needs to lean forward, it should be done by bending at the - ANS ✔✔hips or
neck
What will increase visibility to the lingual surfaces of the mandibular anterior teeth? - ANS
✔✔having the patient tilt their chin down
