HESI DENTAL HYGIENE EXAM TEST BANK 2026 | EXAM QUESTIONS AND CORRECT
ANSWERS (PROFESSOR VERIFIED) | LATEST EDITION (JUST RELEASED)
Question 1
Under which classification of gingival diseases and conditions is puberty-associated gingivitis
found?
A) Non-plaque-induced gingival lesions
B) Gingival diseases modified by systemic factors
C) Plaque-induced gingival diseases modified by systemic factors
D) Periodontitis as a manifestation of systemic disease
E) Chronic periodontitis with systemic involvement
Correct Answer: C) Plaque-induced gingival diseases modified by systemic factors
Rationale: Puberty-associated gingivitis is a localized or generalized inflammation of the
gingiva that occurs during puberty. While dental plaque is the primary initiating factor, the
exaggerated inflammatory response is specifically modified by the rise in sex hormones
(estrogen and testosterone) during this developmental stage, placing it under the category
of systemic factor modification.
Question 2
A patient presents with a short, thick lingual frenum that results in limited tongue movement,
potentially affecting speech and swallowing. Which is the most likely diagnosis?
A) Macroglossia
B) Geographic tongue
C) Ankyloglossia
D) Fissured tongue
E) Bifid tongue
Correct Answer: C) Ankyloglossia
Rationale: Ankyloglossia, commonly known as "tongue-tie," is a congenital anomaly
characterized by an abnormally short or thick lingual frenum. This restricts the tip of the
tongue's range of motion, which can lead to speech impediments, difficulties with oral
hygiene, and challenges with breastfeeding in infants.
Question 3
In the process of tooth development and emergence, when is tooth eruption considered
complete?
A) When the crown first breaks through the gingival tissue
B) When the root has finished developing completely
C) When the tooth has made contact with its antagonists in the opposing jaw
D) When the cementum covers the entire root surface
E) When the dental lamina disappears
Correct Answer: C) Tooth has made contact with its antagonists in opposing jaw
Rationale: Active eruption continues until the tooth meets its functional counterpart
(antagonist) in the opposite arch. Once occlusal contact is established, the tooth has reached
, 2
its functional position, although "passive eruption" (the receding of the gingiva) may
continue throughout life.
Question 4
When does the mixed dentition period typically begin?
A) At the birth of the child
B) With the eruption of the first primary tooth
C) With the eruption of the first permanent tooth
D) When the last primary tooth is exfoliated
E) When the first permanent molar begins to develop in the crypt
Correct Answer: C) eruption of the first permanent tooth
Rationale: The mixed dentition period is defined by the presence of both primary and
permanent teeth in the oral cavity. It officially begins around age 6 with the eruption of the
permanent mandibular first molar or the permanent mandibular central incisor.
Question 5
How many succedaneous teeth are present in the human permanent dentition?
A) 32
B) 28
C) 24
D) 20
E) 10
Correct Answer: D) 20
Rationale: Succedaneous teeth are permanent teeth that replace primary predecessors.
These include the permanent incisors (8), canines (4), and premolars (8), totaling 20.
Permanent molars are NOT succedaneous because they erupt posterior to the primary
dentition without replacing any primary teeth.
Question 6
The junction of a buccal and lingual triangular ridge is a transverse ridge. The oblique ridge of a
maxillary molar is an example of a transverse ridge.
A) Both statements are true
B) Both statements are false
C) The first statement is true, the second is false
D) The first statement is false, the second is true
Correct Answer: C) The first statement is true and the second is false
Rationale: A transverse ridge is formed by the union of two triangular ridges crossing the
occlusal surface from buccal to lingual. However, the oblique ridge (found on maxillary
molars) is unique because it crosses the occlusal surface diagonally from the distobuccal
cusp to the mesiolingual cusp, making it distinct from a standard transverse ridge.
, 3
Question 7
Which factor makes aging enamel less susceptible to caries compared to younger enamel?
A) Increased water content
B) Reduced permeability
C) Increased organic matrix
D) Thinning of the cementum
E) Expansion of the pulp chamber
Correct Answer: B) reduced permeability
Rationale: As enamel ages, it undergoes a process of maturation where it becomes more
highly mineralized and less permeable to fluids and acids. This reduced permeability slows
the diffusion of acids produced by cariogenic bacteria, thereby increasing its resistance to
decay.
Question 8
Which groove is the most identifying characteristic of a three-cusp mandibular second premolar?
A) Central groove
B) Mesiobuccal groove
C) Distolingual groove
D) Lingual groove
E) Buccolingual groove
Correct Answer: D) Lingual groove
Rationale: The three-cusp type of the mandibular second premolar (the Y-pattern) features
one large buccal cusp and two smaller lingual cusps (mesiolingual and distolingual). The
lingual groove separates these two lingual cusps and is a key diagnostic feature of this
specific tooth morphology.
Question 9
Which of the following is true regarding the "height of contour" of a tooth?
A) It is the lowest point of the gingival margin
B) It represents the greatest elevation of the tooth either incisocervically or occlusocervically
C) It is always located at the cementoenamel junction
D) It is found only on the lingual surfaces of anterior teeth
E) It is the point of contact between two adjacent teeth
Correct Answer: B) Greatest elevation of tooth either incisocervically or occlusocervically
Rationale: The height of contour (or crest of curvature) is the point of greatest convexity on
a specific surface of the crown. It is essential for protecting the gingival tissue by diverting
food away from the marginal gingiva during mastication.
Question 10
How many primary and permanent teeth are typically present in a healthy eight-year-old child?
A) 20 primary; 0 permanent
, 4
B) 10 primary; 14 permanent
C) 14 primary; 10 permanent
D) 12 primary; 12 permanent
E) 8 primary; 16 permanent
Correct Answer: C) 14 primary; 10 permanent
Rationale: At age 8, a child usually has the following permanent teeth: 4 first molars and 8
incisors (though the lateral incisors may still be erupting). On average, an 8-year-old has 10
permanent teeth (4 molars, 4 central incisors, 2 mandibular lateral incisors) and 14
primary teeth (canines and molars).
Question 11
Which term describes the junction of two surfaces of a tooth crown?
A) Point angle
B) Line angle
C) Apex
D) Cusp
E) Fossa
Correct Answer: B) line angle
Rationale: A line angle is formed by the junction of two crown surfaces (e.g., mesiofacial). A
point angle is the junction of three surfaces (e.g., mesiofacial-occlusal).
Question 12
According to G.V. Black’s classification of restorations, which class involves the proximal
surfaces of anterior teeth including the incisal edge or angle?
A) Class II
B) Class III
C) Class IV
D) Class V
E) Class VI
Correct Answer: C) IV
Rationale: Class III involves proximal surfaces of anterior teeth NOT including the incisal
edge. Once the incisal angle is involved, it becomes Class IV. Class II involves proximal
surfaces of posterior teeth.
Question 13
Which ridge is a unique anatomical characteristic found only on permanent maxillary molars?
A) Transverse ridge
B) Marginal ridge
C) Oblique ridge
)D) Buccal ridge
E) Lingual ridge
ANSWERS (PROFESSOR VERIFIED) | LATEST EDITION (JUST RELEASED)
Question 1
Under which classification of gingival diseases and conditions is puberty-associated gingivitis
found?
A) Non-plaque-induced gingival lesions
B) Gingival diseases modified by systemic factors
C) Plaque-induced gingival diseases modified by systemic factors
D) Periodontitis as a manifestation of systemic disease
E) Chronic periodontitis with systemic involvement
Correct Answer: C) Plaque-induced gingival diseases modified by systemic factors
Rationale: Puberty-associated gingivitis is a localized or generalized inflammation of the
gingiva that occurs during puberty. While dental plaque is the primary initiating factor, the
exaggerated inflammatory response is specifically modified by the rise in sex hormones
(estrogen and testosterone) during this developmental stage, placing it under the category
of systemic factor modification.
Question 2
A patient presents with a short, thick lingual frenum that results in limited tongue movement,
potentially affecting speech and swallowing. Which is the most likely diagnosis?
A) Macroglossia
B) Geographic tongue
C) Ankyloglossia
D) Fissured tongue
E) Bifid tongue
Correct Answer: C) Ankyloglossia
Rationale: Ankyloglossia, commonly known as "tongue-tie," is a congenital anomaly
characterized by an abnormally short or thick lingual frenum. This restricts the tip of the
tongue's range of motion, which can lead to speech impediments, difficulties with oral
hygiene, and challenges with breastfeeding in infants.
Question 3
In the process of tooth development and emergence, when is tooth eruption considered
complete?
A) When the crown first breaks through the gingival tissue
B) When the root has finished developing completely
C) When the tooth has made contact with its antagonists in the opposing jaw
D) When the cementum covers the entire root surface
E) When the dental lamina disappears
Correct Answer: C) Tooth has made contact with its antagonists in opposing jaw
Rationale: Active eruption continues until the tooth meets its functional counterpart
(antagonist) in the opposite arch. Once occlusal contact is established, the tooth has reached
, 2
its functional position, although "passive eruption" (the receding of the gingiva) may
continue throughout life.
Question 4
When does the mixed dentition period typically begin?
A) At the birth of the child
B) With the eruption of the first primary tooth
C) With the eruption of the first permanent tooth
D) When the last primary tooth is exfoliated
E) When the first permanent molar begins to develop in the crypt
Correct Answer: C) eruption of the first permanent tooth
Rationale: The mixed dentition period is defined by the presence of both primary and
permanent teeth in the oral cavity. It officially begins around age 6 with the eruption of the
permanent mandibular first molar or the permanent mandibular central incisor.
Question 5
How many succedaneous teeth are present in the human permanent dentition?
A) 32
B) 28
C) 24
D) 20
E) 10
Correct Answer: D) 20
Rationale: Succedaneous teeth are permanent teeth that replace primary predecessors.
These include the permanent incisors (8), canines (4), and premolars (8), totaling 20.
Permanent molars are NOT succedaneous because they erupt posterior to the primary
dentition without replacing any primary teeth.
Question 6
The junction of a buccal and lingual triangular ridge is a transverse ridge. The oblique ridge of a
maxillary molar is an example of a transverse ridge.
A) Both statements are true
B) Both statements are false
C) The first statement is true, the second is false
D) The first statement is false, the second is true
Correct Answer: C) The first statement is true and the second is false
Rationale: A transverse ridge is formed by the union of two triangular ridges crossing the
occlusal surface from buccal to lingual. However, the oblique ridge (found on maxillary
molars) is unique because it crosses the occlusal surface diagonally from the distobuccal
cusp to the mesiolingual cusp, making it distinct from a standard transverse ridge.
, 3
Question 7
Which factor makes aging enamel less susceptible to caries compared to younger enamel?
A) Increased water content
B) Reduced permeability
C) Increased organic matrix
D) Thinning of the cementum
E) Expansion of the pulp chamber
Correct Answer: B) reduced permeability
Rationale: As enamel ages, it undergoes a process of maturation where it becomes more
highly mineralized and less permeable to fluids and acids. This reduced permeability slows
the diffusion of acids produced by cariogenic bacteria, thereby increasing its resistance to
decay.
Question 8
Which groove is the most identifying characteristic of a three-cusp mandibular second premolar?
A) Central groove
B) Mesiobuccal groove
C) Distolingual groove
D) Lingual groove
E) Buccolingual groove
Correct Answer: D) Lingual groove
Rationale: The three-cusp type of the mandibular second premolar (the Y-pattern) features
one large buccal cusp and two smaller lingual cusps (mesiolingual and distolingual). The
lingual groove separates these two lingual cusps and is a key diagnostic feature of this
specific tooth morphology.
Question 9
Which of the following is true regarding the "height of contour" of a tooth?
A) It is the lowest point of the gingival margin
B) It represents the greatest elevation of the tooth either incisocervically or occlusocervically
C) It is always located at the cementoenamel junction
D) It is found only on the lingual surfaces of anterior teeth
E) It is the point of contact between two adjacent teeth
Correct Answer: B) Greatest elevation of tooth either incisocervically or occlusocervically
Rationale: The height of contour (or crest of curvature) is the point of greatest convexity on
a specific surface of the crown. It is essential for protecting the gingival tissue by diverting
food away from the marginal gingiva during mastication.
Question 10
How many primary and permanent teeth are typically present in a healthy eight-year-old child?
A) 20 primary; 0 permanent
, 4
B) 10 primary; 14 permanent
C) 14 primary; 10 permanent
D) 12 primary; 12 permanent
E) 8 primary; 16 permanent
Correct Answer: C) 14 primary; 10 permanent
Rationale: At age 8, a child usually has the following permanent teeth: 4 first molars and 8
incisors (though the lateral incisors may still be erupting). On average, an 8-year-old has 10
permanent teeth (4 molars, 4 central incisors, 2 mandibular lateral incisors) and 14
primary teeth (canines and molars).
Question 11
Which term describes the junction of two surfaces of a tooth crown?
A) Point angle
B) Line angle
C) Apex
D) Cusp
E) Fossa
Correct Answer: B) line angle
Rationale: A line angle is formed by the junction of two crown surfaces (e.g., mesiofacial). A
point angle is the junction of three surfaces (e.g., mesiofacial-occlusal).
Question 12
According to G.V. Black’s classification of restorations, which class involves the proximal
surfaces of anterior teeth including the incisal edge or angle?
A) Class II
B) Class III
C) Class IV
D) Class V
E) Class VI
Correct Answer: C) IV
Rationale: Class III involves proximal surfaces of anterior teeth NOT including the incisal
edge. Once the incisal angle is involved, it becomes Class IV. Class II involves proximal
surfaces of posterior teeth.
Question 13
Which ridge is a unique anatomical characteristic found only on permanent maxillary molars?
A) Transverse ridge
B) Marginal ridge
C) Oblique ridge
)D) Buccal ridge
E) Lingual ridge
