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ADEX
RESTORATIVE FUNCTIONS
MOCK EXAM
2026/2027 EDITION
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Complete Exam-Style Questions with Correct Answers | Graded A+
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,—1—
,Section 1: Introduction
This ADEX Restorative Functions Mock Exam is a comprehensive preparation resource
designed to reflect the current content, format, and clinical rigor of the American Board of
Dental Examiners Restorative Functions examination for dental hygienists. The exam
covers restorative theory, patient assessment, isolation and field control, cavity
preparation across all classifications, restorative materials, matrix and wedge systems,
finishing and polishing, infection control, patient management, ethics, and legal scope of
practice.
Each question is presented in examination format with four answer choices, the correct
answer highlighted in bold cyan, and a detailed clinical rationale that explains the
reasoning and identifies key distractors. The examination is aligned with 2025–2026
evidence-based clinical practice standards and ADEX scoring criteria to support successful
examination performance.
Section 2: The Complete Exam
1. Which permanent tooth has the longest root in the human dentition?
A. Maxillary first premolar
B. Maxillary canine
C. Mandibular canine
D. Maxillary lateral incisor
Rationale: The maxillary canine possesses the longest root of any permanent tooth,
averaging approximately 26–27 mm in length. This provides exceptional anchorage and
makes it a cornerstone of the dental arch; knowledge of root anatomy is essential during
matrix adaptation, wedge placement, and rubber dam clamp selection.
2. The anatomical feature where the enamel of the crown meets the cementum of the root
is termed the:
A. Anatomical crown
B. Dentinoenamel junction (DEJ)
C. Cervical line curvature
D. Cementoenamel junction (CEJ)
Rationale: The cementoenamel junction (CEJ), also known as the cervical line, is the
demarcation where enamel and cementum meet. In health, the CEJ is approximately 1–2
mm coronal to the alveolar crest; Class V preparations frequently involve this region and
require careful margin placement relative to the CEJ.
, 3. In a Class I occlusion according to Angle's classification, the mesiobuccal cusp of the
maxillary first molar occludes with the:
A. Buccal groove between mandibular first and second molars
B. Distobuccal groove of the mandibular first molar
C. Mesiobuccal groove of the mandibular first molar
D. Central fossa of the mandibular first molar
Rationale: Angle Class I occlusion is defined by the mesiobuccal cusp of the maxillary
first molar aligning with the mesiobuccal (central) groove of the mandibular first molar.
This relationship is the reference for normal occlusion and is critical when evaluating
centric stops and adjusting restorations to prevent premature contacts.
4. Which tooth structure provides the greatest resistance to compressive forces during
mastication?
A. Dentin
B. Cementum
C. Pulp
D. Enamel
Rationale: Enamel is the most highly mineralized tissue in the body (approximately 96%
hydroxyapatite) and provides the primary resistance to compressive masticatory forces.
Cavity preparation design must preserve enamel rods supported by underlying dentin to
prevent marginal fracture and restoration failure.
5. The primary occlusal morphology feature that distinguishes a mandibular first molar
from a maxillary first molar is the presence of:
A. A cusp of Carabelli
B. Three buccal cusps and two lingual cusps (5 cusps total)
C. A rhomboidal occlusal outline
D. Four well-developed cusps of approximately equal size
Rationale: The mandibular first molar typically has five cusps: three buccal
(mesiobuccal, distobuccal, distal) and two lingual (mesiolingual, distolingual). The
maxillary first molar usually has four major cusps plus the cusp of Carabelli; recognizing
this anatomy is essential for proper Class I cavity preparation outline form.
6. The centric holding stops that support vertical dimension of occlusion are located
primarily on the:
A. Lingual inclines of maxillary buccal cusps and buccal inclines of mandibular
lingual cusps
B. Tips of functional cusps and corresponding fossae/marginal ridges
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━━━━━━━━━━━━━━━━━
ADEX
RESTORATIVE FUNCTIONS
MOCK EXAM
2026/2027 EDITION
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
━━━━━━━━━━━━━━━━━
Complete Exam-Style Questions with Correct Answers | Graded A+
················· ◆ ◇ ◆
·················· ◆ ◆◆◆ ◆
··················· ◆◆ ◆ ◆◆
,—1—
,Section 1: Introduction
This ADEX Restorative Functions Mock Exam is a comprehensive preparation resource
designed to reflect the current content, format, and clinical rigor of the American Board of
Dental Examiners Restorative Functions examination for dental hygienists. The exam
covers restorative theory, patient assessment, isolation and field control, cavity
preparation across all classifications, restorative materials, matrix and wedge systems,
finishing and polishing, infection control, patient management, ethics, and legal scope of
practice.
Each question is presented in examination format with four answer choices, the correct
answer highlighted in bold cyan, and a detailed clinical rationale that explains the
reasoning and identifies key distractors. The examination is aligned with 2025–2026
evidence-based clinical practice standards and ADEX scoring criteria to support successful
examination performance.
Section 2: The Complete Exam
1. Which permanent tooth has the longest root in the human dentition?
A. Maxillary first premolar
B. Maxillary canine
C. Mandibular canine
D. Maxillary lateral incisor
Rationale: The maxillary canine possesses the longest root of any permanent tooth,
averaging approximately 26–27 mm in length. This provides exceptional anchorage and
makes it a cornerstone of the dental arch; knowledge of root anatomy is essential during
matrix adaptation, wedge placement, and rubber dam clamp selection.
2. The anatomical feature where the enamel of the crown meets the cementum of the root
is termed the:
A. Anatomical crown
B. Dentinoenamel junction (DEJ)
C. Cervical line curvature
D. Cementoenamel junction (CEJ)
Rationale: The cementoenamel junction (CEJ), also known as the cervical line, is the
demarcation where enamel and cementum meet. In health, the CEJ is approximately 1–2
mm coronal to the alveolar crest; Class V preparations frequently involve this region and
require careful margin placement relative to the CEJ.
, 3. In a Class I occlusion according to Angle's classification, the mesiobuccal cusp of the
maxillary first molar occludes with the:
A. Buccal groove between mandibular first and second molars
B. Distobuccal groove of the mandibular first molar
C. Mesiobuccal groove of the mandibular first molar
D. Central fossa of the mandibular first molar
Rationale: Angle Class I occlusion is defined by the mesiobuccal cusp of the maxillary
first molar aligning with the mesiobuccal (central) groove of the mandibular first molar.
This relationship is the reference for normal occlusion and is critical when evaluating
centric stops and adjusting restorations to prevent premature contacts.
4. Which tooth structure provides the greatest resistance to compressive forces during
mastication?
A. Dentin
B. Cementum
C. Pulp
D. Enamel
Rationale: Enamel is the most highly mineralized tissue in the body (approximately 96%
hydroxyapatite) and provides the primary resistance to compressive masticatory forces.
Cavity preparation design must preserve enamel rods supported by underlying dentin to
prevent marginal fracture and restoration failure.
5. The primary occlusal morphology feature that distinguishes a mandibular first molar
from a maxillary first molar is the presence of:
A. A cusp of Carabelli
B. Three buccal cusps and two lingual cusps (5 cusps total)
C. A rhomboidal occlusal outline
D. Four well-developed cusps of approximately equal size
Rationale: The mandibular first molar typically has five cusps: three buccal
(mesiobuccal, distobuccal, distal) and two lingual (mesiolingual, distolingual). The
maxillary first molar usually has four major cusps plus the cusp of Carabelli; recognizing
this anatomy is essential for proper Class I cavity preparation outline form.
6. The centric holding stops that support vertical dimension of occlusion are located
primarily on the:
A. Lingual inclines of maxillary buccal cusps and buccal inclines of mandibular
lingual cusps
B. Tips of functional cusps and corresponding fossae/marginal ridges
