EFDA Practice Exam 239 Questions and Answers 2025.

EFDA Practice Exam 239 Questions and Answer a= a= a= a= a= a=




s 2025 a=




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




The point or area where approximating teeth in the same arch touch or meet each other is referred to
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as the ________. -
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a= ✅ contact area
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Where are the TWO purposes of contact areas? -
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a= ✅ -to keep food from packing between the teeth
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-help stabilize the dental arches
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Coronal to the actual division into two or more roots is a concavity that extends to or nearly to the CEJ.
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This concavity is called -
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a= ✅ the furrowa=a= a=




What is the HARDEST tissue in the body? -
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a= ✅ enamel a=a=




What cells form enamel? -a= a= a= a= a=




a= ✅ ameloblasts
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The bulk of the tooth is made up of -
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,a= ✅ dentin a=a=




In permanent teeth, the process of enamel formation is completed about ___ years before eruption. -
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a= ✅3 a=a=




What is the composition of enamel? -
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a= ✅ 95% inorganic matter, 5% organic matter and water
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What is the SECOND hardest material in the body? -
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a= ✅ dentin a=a=




What is the composition of dentin? -
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a= ✅ 70% inorganic, 20% organic, 10% water
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The three major types of dentin -
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a= ✅ primary, secondary, reparative
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What type of dentin is a DEFENSE reaction to an area of injury? -
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a= ✅ reparative dentin
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What has the HIGHEST fluoride content of all the materialized tissue? -
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a= ✅ cementum a=a=




The two types of cementum -
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a= ✅ acellular and cellular
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What type of cementum ACTIVELY produces new layers of cementum throughout the life of the tooth
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?- a= a=




a= ✅ cellular a=a=




What teeth have the cusp of Carabelli? -
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, a= ✅ maxillary first molars
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The ridge formed by the union of two triangular ridges -
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a= ✅ transverse ridge
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The spillway provides an escape for food from the _______ surface during the mastication (chewing) p
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rocess. - a= a=




a= ✅ occlusal a=a=




The uncut tooth structure adjacent to the cavity prep -
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a= ✅ cavosurface
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line angle - a= a= a=




a= ✅ two wallsa=a= a=




point angle - a= a= a=




a= ✅ three walls
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A thin soft tissue that is loosely attached to the underlying bone -
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a= ✅ alveolar mucosa
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T or F
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Undue stress continually placed on the body can contribute to lower back pain, circulatory problems,
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muscle aches, and tension - a= a= a= a= a=




a= ✅ True a=a=




When seated, the thighs should be _______ to the floor -
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a= ✅ parallel a=a=




The chair is raised or lowered to achieve ____ to ____ inches distance between the patient's face and t
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he operator's face -
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a= ✅ 12 to 14 a=a= a= a=