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Exam (elaborations)

EFDA Practice Questions Questions and Answers 2024/2025

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In the Federation Dentaire International System for numbering, the first number represents a _________, while the second number represents a _________.  quadrant, tooth What is the visible portion of the anatomical crown known as?  the clinical crown The area where the roots divide ...

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  • October 10, 2024
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2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!


EFDA Practice Questions Questions and
Answers 2024/2025
In the Federation Dentaire International System for numbering, the first number represents a

_________, while the second number represents a _________.


 quadrant, tooth


What is the visible portion of the anatomical crown known as?

 the clinical crown


The area where the roots divide

 furcation


The point or area where approximating teeth in the same arch touch or meet each other is

referred to as the ________.

 contact area


Where are the TWO purposes of contact areas?

 -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

 the furrow


What is the HARDEST tissue in the body?

1|Page| GradeA+ | 2 0 0 2 5

,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!

 enamel


What cells form enamel?


 ameloblasts


The bulk of the tooth is made up of

 dentin


In permanent teeth, the process of enamel formation is completed about ___ years before

eruption.


 3


What is the composition of enamel?

 95% inorganic matter, 5% organic matter and water


What is the SECOND hardest material in the body?

 dentin


What is the composition of dentin?

 70% inorganic, 20% organic, 10% water


The three major types of dentin


 primary, secondary, reparative


What type of dentin is a DEFENSE reaction to an area of injury?



1|Page| GradeA+ | 2 0 0 2 5

,2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!

 reparative dentin


What has the HIGHEST fluoride content of all the materialized tissue?


 cementum


The two types of cementum

 acellular and cellular


What type of cementum ACTIVELY produces new layers of cementum throughout the life of the

tooth?


 cellular


What teeth have the cusp of Carabelli?

 maxillary first molars


The ridge formed by the union of two triangular ridges

 transverse ridge


The spillway provides an escape for food from the _______ surface during the mastication

(chewing) process.


 occlusal


The uncut tooth structure adjacent to the cavity prep

 cavosurface


line angle

1|Page| GradeA+ | 2 0 0 2 5

, 2 0 2 4 /2025 | © copyright | This work may not be copied for profit gain Excel!

 two walls


point angle


 three walls


A thin soft tissue that is loosely attached to the underlying bone

 alveolar mucosa


T or F

Undue stress continually placed on the body can contribute to lower back pain, circulatory

problems, muscle aches, and tension

 True


When seated, the thighs should be _______ to the floor

 parallel


The chair is raised or lowered to achieve ____ to ____ inches distance between the patient's

face and the operator's face

 12 to 14


The back of the patient chair is raised until its angle to the floor is ______ degrees

 25-45


The three basic parts of an instrument are

 the working end, shank, and handle


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