1
HESI Dental Hygiene Exam Actual Exam
2026/2027 – Complete Exam-Style Questions
with Detailed Rationales | 100% Verified |
Pass Guaranteed – A+ Graded
[SECTION 1: Scientific Basis for Dental Hygiene — Questions 1-50]
Q1: Which of the following bones of the cranium contains the sigmoid sinus and articulates with
the mandible at the temporomandibular joint (TMJ)?
A. Sphenoid bone
B. Ethmoid bone
C. Temporal bone [CORRECT]
D. Zygomatic bone
Correct Answer: C
Rationale: The temporal bone is a complex bone located at the sides and base of the skull. It
houses the middle and inner ear structures and contains the mandibular fossa (glenoid fossa),
which articulates with the condyle of the mandible to form the TMJ. The sphenoid and ethmoid
bones are central cranial bones contributing to the nasal cavity and orbit but do not articulate
with the mandible; the zygomatic bone forms the cheek and arch but is not part of the cranial
base articulation.
Q2: Which muscle of mastication is responsible for protruding the mandible and moving it from
side to side (lateral excursion)?
A. Masseter
B. Temporalis
C. Lateral pterygoid [CORRECT]
D. Medial pterygoid
Correct Answer: C
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Rationale: The lateral pterygoid is the primary muscle responsible for protruding the mandible
and, when acting unilaterally, moving the mandible to the opposite side (contralateral excursion).
The masseter and medial pterygoid are elevators (close the jaw), and the temporalis acts as an
elevator and a retractor. Understanding these functions is critical for identifying muscle
dysfunction in patients with TMJ disorders.
Q3: Which cranial nerve provides motor innervation to the muscles of facial expression and
carries taste sensations from the anterior two-thirds of the tongue?
A. Trigeminal nerve (CN V)
B. Glossopharyngeal nerve (CN IX)
C. Facial nerve (CN VII) [CORRECT]
D. Hypoglossal nerve (CN XII)
Correct Answer: C
Rationale: The Facial nerve (CN VII) is a mixed nerve; its motor component innervates the
muscles of facial expression (including the buccinator and orbicularis oris), and its chorda
tympani branch carries taste sensation from the anterior two-thirds of the tongue. The Trigeminal
(V) provides sensation to the face and motor to muscles of mastication; Glossopharyngeal (IX)
provides taste to the posterior third; Hypoglossal (XII) provides motor to the tongue muscles.
Q4: A patient presents with a "butterfly" rash across the bridge of the nose and cheeks. This area
corresponds to which anatomical region?
A. Mental region
B. Infraorbital region
C. Nasal and Zygomatic regions [CORRECT]
D. Buccal region
Correct Answer: C
Rationale: The "butterfly" rash, often associated with systemic lupus erythematosus (SLE), spans
the bridge of the nose and the cheeks. The nose is the nasal region, and the cheeks are the
zygomatic region. The mental region is the chin; infraorbital is below the eyes; buccal refers to
,3
the cheek area generally but the specific anatomical distribution of the malar rash highlights the
zygomatic bones.
Q5: Which salivary gland secretes primarily serous fluid and has its duct (Stensen's duct) open
opposite the maxillary second molar?
A. Submandibular gland
B. Sublingual gland
C. Parotid gland [CORRECT]
D. Minor salivary glands
Correct Answer: C
Rationale: The parotid gland is the largest salivary gland and secretes a watery, serous secretion
rich in amylase. Stensen's duct opens into the oral cavity near the maxillary second molar. The
submandibular (Wharton's duct) and sublingual (ducts of Rivinus) glands open in the floor of the
mouth under the tongue. Identifying the duct opening is essential for assessing salivary function
and detecting sialoliths.
Q6: Which component of the periodontium connects the cementum of the tooth to the alveolar
bone proper?
A. Gingiva
B. Alveolar mucosa
C. Periodontal Ligament (PDL) [CORRECT]
D. Junctional epithelium
Correct Answer: C
Rationale: The Periodontal Ligament (PDL) is a specialized connective tissue that attaches the
cementum of the tooth root to the alveolar bone (socket). It consists of collagen fibers (Sharpey's
fibers) that withstand the forces of mastication and act as a shock absorber. The gingiva is the
soft tissue covering; alveolar mucosa is the lining of the vestibule; junctional epithelium forms
the attachment to the tooth.
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Q7: The pulp chamber within the crown of the tooth narrows down at the cervix to form the root
canal, which exits at the:
A. Cementoenamel junction (CEJ)
B. Apex
C. Apex [CORRECT]
D. Furcation
Correct Answer: C
Rationale: The root canal is the continuation of the pulp chamber into the root of the tooth. It
terminates at the apex of the root, where blood vessels and nerves enter the tooth through the
apical foramen. The CEJ is the line where enamel meets cementum; the furcation is the area
where the roots divide on multi-rooted teeth.
Q8: Which papillae on the dorsal surface of the tongue contain taste buds and are arranged in a
"V" shape at the back of the tongue?
A. Filiform papillae
B. Fungiform papillae
C. Circumvallate papillae [CORRECT]
D. Foliate papillae
Correct Answer: C
Rationale: Circumvallate papillae are large, dome-shaped structures arranged in a V-shape at the
posterior border of the tongue. They are surrounded by a trench and contain numerous taste buds.
Filiform papillae are the most numerous but lack taste buds (providing friction); fungiform are
scattered mushroom-shaped papillae with taste buds; foliate are located on the lateral sides.
Q9: Which of the following bacteria is strongly associated with the etiology of dental caries due
to its acidogenic and aciduric properties?
A. Porphyromonas gingivalis
B. Streptococcus mutans
HESI Dental Hygiene Exam Actual Exam
2026/2027 – Complete Exam-Style Questions
with Detailed Rationales | 100% Verified |
Pass Guaranteed – A+ Graded
[SECTION 1: Scientific Basis for Dental Hygiene — Questions 1-50]
Q1: Which of the following bones of the cranium contains the sigmoid sinus and articulates with
the mandible at the temporomandibular joint (TMJ)?
A. Sphenoid bone
B. Ethmoid bone
C. Temporal bone [CORRECT]
D. Zygomatic bone
Correct Answer: C
Rationale: The temporal bone is a complex bone located at the sides and base of the skull. It
houses the middle and inner ear structures and contains the mandibular fossa (glenoid fossa),
which articulates with the condyle of the mandible to form the TMJ. The sphenoid and ethmoid
bones are central cranial bones contributing to the nasal cavity and orbit but do not articulate
with the mandible; the zygomatic bone forms the cheek and arch but is not part of the cranial
base articulation.
Q2: Which muscle of mastication is responsible for protruding the mandible and moving it from
side to side (lateral excursion)?
A. Masseter
B. Temporalis
C. Lateral pterygoid [CORRECT]
D. Medial pterygoid
Correct Answer: C
,2
Rationale: The lateral pterygoid is the primary muscle responsible for protruding the mandible
and, when acting unilaterally, moving the mandible to the opposite side (contralateral excursion).
The masseter and medial pterygoid are elevators (close the jaw), and the temporalis acts as an
elevator and a retractor. Understanding these functions is critical for identifying muscle
dysfunction in patients with TMJ disorders.
Q3: Which cranial nerve provides motor innervation to the muscles of facial expression and
carries taste sensations from the anterior two-thirds of the tongue?
A. Trigeminal nerve (CN V)
B. Glossopharyngeal nerve (CN IX)
C. Facial nerve (CN VII) [CORRECT]
D. Hypoglossal nerve (CN XII)
Correct Answer: C
Rationale: The Facial nerve (CN VII) is a mixed nerve; its motor component innervates the
muscles of facial expression (including the buccinator and orbicularis oris), and its chorda
tympani branch carries taste sensation from the anterior two-thirds of the tongue. The Trigeminal
(V) provides sensation to the face and motor to muscles of mastication; Glossopharyngeal (IX)
provides taste to the posterior third; Hypoglossal (XII) provides motor to the tongue muscles.
Q4: A patient presents with a "butterfly" rash across the bridge of the nose and cheeks. This area
corresponds to which anatomical region?
A. Mental region
B. Infraorbital region
C. Nasal and Zygomatic regions [CORRECT]
D. Buccal region
Correct Answer: C
Rationale: The "butterfly" rash, often associated with systemic lupus erythematosus (SLE), spans
the bridge of the nose and the cheeks. The nose is the nasal region, and the cheeks are the
zygomatic region. The mental region is the chin; infraorbital is below the eyes; buccal refers to
,3
the cheek area generally but the specific anatomical distribution of the malar rash highlights the
zygomatic bones.
Q5: Which salivary gland secretes primarily serous fluid and has its duct (Stensen's duct) open
opposite the maxillary second molar?
A. Submandibular gland
B. Sublingual gland
C. Parotid gland [CORRECT]
D. Minor salivary glands
Correct Answer: C
Rationale: The parotid gland is the largest salivary gland and secretes a watery, serous secretion
rich in amylase. Stensen's duct opens into the oral cavity near the maxillary second molar. The
submandibular (Wharton's duct) and sublingual (ducts of Rivinus) glands open in the floor of the
mouth under the tongue. Identifying the duct opening is essential for assessing salivary function
and detecting sialoliths.
Q6: Which component of the periodontium connects the cementum of the tooth to the alveolar
bone proper?
A. Gingiva
B. Alveolar mucosa
C. Periodontal Ligament (PDL) [CORRECT]
D. Junctional epithelium
Correct Answer: C
Rationale: The Periodontal Ligament (PDL) is a specialized connective tissue that attaches the
cementum of the tooth root to the alveolar bone (socket). It consists of collagen fibers (Sharpey's
fibers) that withstand the forces of mastication and act as a shock absorber. The gingiva is the
soft tissue covering; alveolar mucosa is the lining of the vestibule; junctional epithelium forms
the attachment to the tooth.
, 4
Q7: The pulp chamber within the crown of the tooth narrows down at the cervix to form the root
canal, which exits at the:
A. Cementoenamel junction (CEJ)
B. Apex
C. Apex [CORRECT]
D. Furcation
Correct Answer: C
Rationale: The root canal is the continuation of the pulp chamber into the root of the tooth. It
terminates at the apex of the root, where blood vessels and nerves enter the tooth through the
apical foramen. The CEJ is the line where enamel meets cementum; the furcation is the area
where the roots divide on multi-rooted teeth.
Q8: Which papillae on the dorsal surface of the tongue contain taste buds and are arranged in a
"V" shape at the back of the tongue?
A. Filiform papillae
B. Fungiform papillae
C. Circumvallate papillae [CORRECT]
D. Foliate papillae
Correct Answer: C
Rationale: Circumvallate papillae are large, dome-shaped structures arranged in a V-shape at the
posterior border of the tongue. They are surrounded by a trench and contain numerous taste buds.
Filiform papillae are the most numerous but lack taste buds (providing friction); fungiform are
scattered mushroom-shaped papillae with taste buds; foliate are located on the lateral sides.
Q9: Which of the following bacteria is strongly associated with the etiology of dental caries due
to its acidogenic and aciduric properties?
A. Porphyromonas gingivalis
B. Streptococcus mutans
