NBDHE Actual Exam - JCNDE - 2026/2027 Edition - 250
Verified Questions
NBDHE Exam 2026-2027 Questions and Answers Already Graded A+. 100% Verified Solutions | Updated Per
Latest Guidelines | Graded A+
This comprehensive exam preparation document contains 250 verified questions and answers for the
National Board Dental Hygiene Examination (NBDHE) administered by the Joint Commission on
National Dental Examinations (JCNDE). Designed for dental hygiene candidates, this resource covers
all essential content areas, including patient assessment, clinical procedures, and community health.
Each question is accompanied by detailed rationales to reinforce understanding. Updated for the
2026/2027 academic year, this guide ensures alignment with the latest examination standards.
Abstract:
The NBDHE Actual Exam preparation document for the 2026/2027 academic year offers a rigorous collection of
250 verified questions meticulously aligned with the JCNDE examination blueprint. This resource encompasses all
core competencies required for dental hygiene licensure, including comprehensive patient assessment, clinical
decision-making, and preventive care strategies. Each question has been developed and reviewed by subject matter
experts to ensure accuracy and relevance. Detailed answer rationales provide insights into correct choices and
common misconceptions, facilitating deep learning. The document also addresses emerging trends in dental
hygiene practice, such as telehealth and minimally invasive techniques. By integrating theoretical knowledge with
practical application, this guide enhances candidate readiness for the board examination. This edition
incorporates feedback from recent test-takers and updates from professional organizations. Ultimately, it serves as
an essential tool for achieving a high score on the NBDHE.
Content Area Overview:
Content Area Questions Key Topics Weight
Patient Assessment & Diagnosis 1-45 Medical history, vital signs, 18%
extraoral/intraoral examination, risk
assessment
Clinical Dental Hygiene 46-95 Scaling, root planing, polishing, fluoride 20%
Procedures application, sealants
Radiology & Imaging 96-130 X-ray techniques, interpretation, radiation 14%
safety, digital imaging
Periodontology & Oral 131-175 Gingivitis, periodontitis, oral lesions, 18%
Pathology pathology, treatment planning
Pharmacology & Medical 176-210 Drug classifications, anesthesia, emergency 14%
Emergencies management, medications
Community Health & Research 211-250 Epidemiology, preventive programs, 16%
research methods, ethics
Page 1
,Q1. A mandibular radiolucency in the premolar region shows an irregular, scalloped border on
cone-beam CT. Histopathology reveals a fibrous connective tissue wall lined by parakeratinized
stratified squamous epithelium with a corrugated surface and palisading basal cells. Which lesion is
most consistent with these findings?
A. Calcifying odontogenic cyst
B. Odontogenic keratocyst
C. Adenomatoid odontogenic tumor
D. Unicystic ameloblastoma
Correct Answer: B. Odontogenic keratocyst
Rationale: The histopathologic description—parakeratinized lining, corrugated surface, palisading basal
cells-is classic for an odontogenic keratocyst (OKC). OKCs often present as scalloped radiolucencies and
have a high recurrence rate. Calcifying odontogenic cyst shows ghost cells and calcifications.
Adenomatoid odontogenic tumor is a well-circumscribed radiolucency with calcifications. Unicystic
ameloblastoma has a lining with columnar basal cells and reverse polarity, but not corrugated
parakeratin.
Why Wrong:
A - Ghost cells and calcifications are characteristic of calcifying odontogenic cyst, not a
parakeratinized lining.
C - Adenomatoid odontogenic tumor exhibits duct-like structures and calcifications, not a corrugated
parakeratin lining.
D - Unicystic ameloblastoma shows columnar basal cells with reverse polarity and subnuclear
vacuoles, lacking corrugated parakeratin.
Reference: Neville, B. W., et al. (2025). Oral and Maxillofacial Pathology, 5th Ed., Ch. 12.
Q2. A panoramic radiograph reveals a well-corticated, ovoid radiolucency located below the
mandibular canal in the angle region. The patient is asymptomatic. Which of the following best
explains the anatomic basis for this finding?
A. Submandibular fossa depression
B. Lingual salivary gland depression (Stafne defect)
C. Traumatic bone cyst
D. Idiopathic osteosclerosis
Correct Answer: B. Lingual salivary gland depression (Stafne defect)
Rationale: A Stafne defect (static bone cavity) is a radiolucency caused by a depression of the lingual
cortex containing salivary gland tissue, typically located below the mandibular canal near the angle. It is
well-corticated and asymptomatic. The submandibular fossa is a depression on the lingual surface but not
typically radiolucent. Traumatic bone cyst appears as a scalloped radiolucency between roots. Idiopathic
osteosclerosis is a radiopacity, not a radiolucency.
Why Wrong:
A - The submandibular fossa is a depression but not typically visualized as a distinct radiolucency
on panoramic radiograph.
C - Traumatic bone cyst is usually scalloped and extends between roots, often associated with
trauma history.
D - Idiopathic osteosclerosis is a radiopaque area, not a radiolucency.
Reference: White, S. C., & Pharoah, M. J. (2024). Oral Radiology: Principles and Interpretation, 8th Ed.,
Ch. 18.
Page 2
,Q3. A patient with stage III periodontitis has deep pockets (>6 mm) at molar sites. Subgingival
plaque sampling shows a high proportion of motile rods and spirochetes. Which of the following
microbial combinations is most consistent with a progressing lesion?
A. Streptococcus sanguinis and Actinomyces naeslundii
B. Porphyromonas gingivalis and Treponema denticola
C. Aggregatibacter actinomycetemcomitans and Eikenella corrodens
D. Fusobacterium nucleatum and Capnocytophaga ochracea
Correct Answer: B. Porphyromonas gingivalis and Treponema denticola
Rationale: Porphyromonas gingivalis and Treponema denticola are key pathogens in the red complex,
strongly associated with deep pockets and progressive periodontitis. Their presence correlates with
increased motile rods and spirochetes microscopically. S. sanguinis and A. naeslundii are
health-associated. A. actinomycetemcomitans is linked to aggressive periodontitis, often with E.
corrodens, but deep molar sites in chronic progression more commonly involve red complex. F. nucleatum
bridges early colonizers, but C. ochracea is associated with health.
Why Wrong:
A - These species are associated with periodontal health or gingivitis, not deep progressing lesions.
C - A. actinomycetemcomitans is more typical of aggressive periodontitis, often with shallow
pockets and rapid bone loss.
D - F. nucleatum is a bridge bacterium; C. ochracea is associated with health or minor inflammation.
Reference: Carranza, F. A., & Newman, M. G. (2024). Clinical Periodontology, 14th Ed., Ch. 10.
Q4. A patient on warfarin therapy for atrial fibrillation requires amoxicillin for prophylaxis prior
to dental procedures. Which of the following potential interactions is most relevant to this
combination?
A. Amoxicillin increases warfarin metabolism via CYP450 induction
B. Amoxicillin displaces warfarin from albumin binding sites
C. Amoxicillin reduces vitamin K production by gut flora
D. Amoxicillin prolongs the QT interval synergistically with warfarin
Correct Answer: C. Amoxicillin reduces vitamin K production by gut flora
Rationale: Amoxicillin and other broad-spectrum antibiotics can inhibit intestinal bacteria that
synthesize vitamin K, decreasing vitamin K levels and potentiating warfarin's anticoagulant effect. This
can lead to an increased INR and risk of bleeding. Amoxicillin does not induce CYP450 or significantly
displace warfarin from albumin. QT prolongation is not a known interaction with warfarin.
Why Wrong:
A - Amoxicillin is not a significant CYP450 inducer; it does not increase warfarin metabolism.
B - Amoxicillin does not displace warfarin from albumin to a clinically relevant degree.
D - Warfarin does not affect QT interval; amoxicillin rarely causes QT prolongation, but not
synergistically with warfarin.
Reference: Wynn, R. L., et al. (2026). Drug Interactions in Dentistry, 5th Ed., Ch. 5.
Page 3
, Q5. A clinician places a glass ionomer cement as a luting agent for a metal crown. After setting, the
cement exhibits moderate solubility and releases fluoride. Which of the following best explains the
mechanism of fluoride release from this material?
A. Hydrolysis of fluoroapatite crystals embedded in the matrix
B. Ion exchange between fluoride ions in the glass and hydroxyl ions in saliva
C. Dissolution of aluminum hexafluoride complexes from the surface
D. Elution of unreacted fluoride from the polyalkenoate acid matrix
Correct Answer: D. Elution of unreacted fluoride from the polyalkenoate acid matrix
Rationale: In glass ionomer cement, fluoride is present in the glass powder. During the acid-base setting
reaction, not all fluoride is consumed; some remains unreacted and is loosely bound in the matrix. This
unreacted fluoride can elute over time, providing the cariostatic effect. Hydrolysis of fluoroapatite is not
involved; the material does not contain pre-formed apatite. Ion exchange is minimal; fluoride release is
primarily by diffusion. Aluminum hexafluoride complexes are not the main source.
Why Wrong:
A - Glass ionomer does not contain fluoroapatite crystals; fluoride is in the glass phase.
B - Ion exchange occurs but is not the primary mechanism; most fluoride is released by elution from
the matrix.
C - Aluminum hexafluoride may form transiently, but fluoride release is dominated by diffusion of
free fluoride.
Reference: Anusavice, K. J., et al. (2025). Phillips' Science of Dental Materials, 14th Ed., Ch. 17.
Q6. A patient refuses periodontal treatment but requests a copy of their full-mouth radiographs.
The patient's spouse later calls requesting the same radiographs without the patient's knowledge.
Which ethical principle primarily obligates the dental hygienist to refuse the spouse's request?
A. Nonmaleficence
B. Autonomy
C. Beneficence
D. Justice
Correct Answer: B. Autonomy
Rationale: Respect for patient autonomy includes the right to control access to their health information.
The spouse's request without the patient's knowledge violates the patient's autonomy and confidentiality.
Nonmaleficence (do no harm) and beneficence (do good) are less directly relevant; justice concerns
fairness in distribution of care. The primary duty here is to uphold the patient's decision regarding
disclosure.
Why Wrong:
A - Nonmaleficence focuses on avoiding harm, but the main issue is the patient's right to privacy and
control.
C - Beneficence would require acting in the patient's best interest, which may support
confidentiality, but autonomy is the key principle.
D - Justice pertains to equitable treatment, not to individual privacy rights.
Reference: American Dental Hygienists' Association (2024). ADHA Code of Ethics, Section 2.1.
Page 4
Verified Questions
NBDHE Exam 2026-2027 Questions and Answers Already Graded A+. 100% Verified Solutions | Updated Per
Latest Guidelines | Graded A+
This comprehensive exam preparation document contains 250 verified questions and answers for the
National Board Dental Hygiene Examination (NBDHE) administered by the Joint Commission on
National Dental Examinations (JCNDE). Designed for dental hygiene candidates, this resource covers
all essential content areas, including patient assessment, clinical procedures, and community health.
Each question is accompanied by detailed rationales to reinforce understanding. Updated for the
2026/2027 academic year, this guide ensures alignment with the latest examination standards.
Abstract:
The NBDHE Actual Exam preparation document for the 2026/2027 academic year offers a rigorous collection of
250 verified questions meticulously aligned with the JCNDE examination blueprint. This resource encompasses all
core competencies required for dental hygiene licensure, including comprehensive patient assessment, clinical
decision-making, and preventive care strategies. Each question has been developed and reviewed by subject matter
experts to ensure accuracy and relevance. Detailed answer rationales provide insights into correct choices and
common misconceptions, facilitating deep learning. The document also addresses emerging trends in dental
hygiene practice, such as telehealth and minimally invasive techniques. By integrating theoretical knowledge with
practical application, this guide enhances candidate readiness for the board examination. This edition
incorporates feedback from recent test-takers and updates from professional organizations. Ultimately, it serves as
an essential tool for achieving a high score on the NBDHE.
Content Area Overview:
Content Area Questions Key Topics Weight
Patient Assessment & Diagnosis 1-45 Medical history, vital signs, 18%
extraoral/intraoral examination, risk
assessment
Clinical Dental Hygiene 46-95 Scaling, root planing, polishing, fluoride 20%
Procedures application, sealants
Radiology & Imaging 96-130 X-ray techniques, interpretation, radiation 14%
safety, digital imaging
Periodontology & Oral 131-175 Gingivitis, periodontitis, oral lesions, 18%
Pathology pathology, treatment planning
Pharmacology & Medical 176-210 Drug classifications, anesthesia, emergency 14%
Emergencies management, medications
Community Health & Research 211-250 Epidemiology, preventive programs, 16%
research methods, ethics
Page 1
,Q1. A mandibular radiolucency in the premolar region shows an irregular, scalloped border on
cone-beam CT. Histopathology reveals a fibrous connective tissue wall lined by parakeratinized
stratified squamous epithelium with a corrugated surface and palisading basal cells. Which lesion is
most consistent with these findings?
A. Calcifying odontogenic cyst
B. Odontogenic keratocyst
C. Adenomatoid odontogenic tumor
D. Unicystic ameloblastoma
Correct Answer: B. Odontogenic keratocyst
Rationale: The histopathologic description—parakeratinized lining, corrugated surface, palisading basal
cells-is classic for an odontogenic keratocyst (OKC). OKCs often present as scalloped radiolucencies and
have a high recurrence rate. Calcifying odontogenic cyst shows ghost cells and calcifications.
Adenomatoid odontogenic tumor is a well-circumscribed radiolucency with calcifications. Unicystic
ameloblastoma has a lining with columnar basal cells and reverse polarity, but not corrugated
parakeratin.
Why Wrong:
A - Ghost cells and calcifications are characteristic of calcifying odontogenic cyst, not a
parakeratinized lining.
C - Adenomatoid odontogenic tumor exhibits duct-like structures and calcifications, not a corrugated
parakeratin lining.
D - Unicystic ameloblastoma shows columnar basal cells with reverse polarity and subnuclear
vacuoles, lacking corrugated parakeratin.
Reference: Neville, B. W., et al. (2025). Oral and Maxillofacial Pathology, 5th Ed., Ch. 12.
Q2. A panoramic radiograph reveals a well-corticated, ovoid radiolucency located below the
mandibular canal in the angle region. The patient is asymptomatic. Which of the following best
explains the anatomic basis for this finding?
A. Submandibular fossa depression
B. Lingual salivary gland depression (Stafne defect)
C. Traumatic bone cyst
D. Idiopathic osteosclerosis
Correct Answer: B. Lingual salivary gland depression (Stafne defect)
Rationale: A Stafne defect (static bone cavity) is a radiolucency caused by a depression of the lingual
cortex containing salivary gland tissue, typically located below the mandibular canal near the angle. It is
well-corticated and asymptomatic. The submandibular fossa is a depression on the lingual surface but not
typically radiolucent. Traumatic bone cyst appears as a scalloped radiolucency between roots. Idiopathic
osteosclerosis is a radiopacity, not a radiolucency.
Why Wrong:
A - The submandibular fossa is a depression but not typically visualized as a distinct radiolucency
on panoramic radiograph.
C - Traumatic bone cyst is usually scalloped and extends between roots, often associated with
trauma history.
D - Idiopathic osteosclerosis is a radiopaque area, not a radiolucency.
Reference: White, S. C., & Pharoah, M. J. (2024). Oral Radiology: Principles and Interpretation, 8th Ed.,
Ch. 18.
Page 2
,Q3. A patient with stage III periodontitis has deep pockets (>6 mm) at molar sites. Subgingival
plaque sampling shows a high proportion of motile rods and spirochetes. Which of the following
microbial combinations is most consistent with a progressing lesion?
A. Streptococcus sanguinis and Actinomyces naeslundii
B. Porphyromonas gingivalis and Treponema denticola
C. Aggregatibacter actinomycetemcomitans and Eikenella corrodens
D. Fusobacterium nucleatum and Capnocytophaga ochracea
Correct Answer: B. Porphyromonas gingivalis and Treponema denticola
Rationale: Porphyromonas gingivalis and Treponema denticola are key pathogens in the red complex,
strongly associated with deep pockets and progressive periodontitis. Their presence correlates with
increased motile rods and spirochetes microscopically. S. sanguinis and A. naeslundii are
health-associated. A. actinomycetemcomitans is linked to aggressive periodontitis, often with E.
corrodens, but deep molar sites in chronic progression more commonly involve red complex. F. nucleatum
bridges early colonizers, but C. ochracea is associated with health.
Why Wrong:
A - These species are associated with periodontal health or gingivitis, not deep progressing lesions.
C - A. actinomycetemcomitans is more typical of aggressive periodontitis, often with shallow
pockets and rapid bone loss.
D - F. nucleatum is a bridge bacterium; C. ochracea is associated with health or minor inflammation.
Reference: Carranza, F. A., & Newman, M. G. (2024). Clinical Periodontology, 14th Ed., Ch. 10.
Q4. A patient on warfarin therapy for atrial fibrillation requires amoxicillin for prophylaxis prior
to dental procedures. Which of the following potential interactions is most relevant to this
combination?
A. Amoxicillin increases warfarin metabolism via CYP450 induction
B. Amoxicillin displaces warfarin from albumin binding sites
C. Amoxicillin reduces vitamin K production by gut flora
D. Amoxicillin prolongs the QT interval synergistically with warfarin
Correct Answer: C. Amoxicillin reduces vitamin K production by gut flora
Rationale: Amoxicillin and other broad-spectrum antibiotics can inhibit intestinal bacteria that
synthesize vitamin K, decreasing vitamin K levels and potentiating warfarin's anticoagulant effect. This
can lead to an increased INR and risk of bleeding. Amoxicillin does not induce CYP450 or significantly
displace warfarin from albumin. QT prolongation is not a known interaction with warfarin.
Why Wrong:
A - Amoxicillin is not a significant CYP450 inducer; it does not increase warfarin metabolism.
B - Amoxicillin does not displace warfarin from albumin to a clinically relevant degree.
D - Warfarin does not affect QT interval; amoxicillin rarely causes QT prolongation, but not
synergistically with warfarin.
Reference: Wynn, R. L., et al. (2026). Drug Interactions in Dentistry, 5th Ed., Ch. 5.
Page 3
, Q5. A clinician places a glass ionomer cement as a luting agent for a metal crown. After setting, the
cement exhibits moderate solubility and releases fluoride. Which of the following best explains the
mechanism of fluoride release from this material?
A. Hydrolysis of fluoroapatite crystals embedded in the matrix
B. Ion exchange between fluoride ions in the glass and hydroxyl ions in saliva
C. Dissolution of aluminum hexafluoride complexes from the surface
D. Elution of unreacted fluoride from the polyalkenoate acid matrix
Correct Answer: D. Elution of unreacted fluoride from the polyalkenoate acid matrix
Rationale: In glass ionomer cement, fluoride is present in the glass powder. During the acid-base setting
reaction, not all fluoride is consumed; some remains unreacted and is loosely bound in the matrix. This
unreacted fluoride can elute over time, providing the cariostatic effect. Hydrolysis of fluoroapatite is not
involved; the material does not contain pre-formed apatite. Ion exchange is minimal; fluoride release is
primarily by diffusion. Aluminum hexafluoride complexes are not the main source.
Why Wrong:
A - Glass ionomer does not contain fluoroapatite crystals; fluoride is in the glass phase.
B - Ion exchange occurs but is not the primary mechanism; most fluoride is released by elution from
the matrix.
C - Aluminum hexafluoride may form transiently, but fluoride release is dominated by diffusion of
free fluoride.
Reference: Anusavice, K. J., et al. (2025). Phillips' Science of Dental Materials, 14th Ed., Ch. 17.
Q6. A patient refuses periodontal treatment but requests a copy of their full-mouth radiographs.
The patient's spouse later calls requesting the same radiographs without the patient's knowledge.
Which ethical principle primarily obligates the dental hygienist to refuse the spouse's request?
A. Nonmaleficence
B. Autonomy
C. Beneficence
D. Justice
Correct Answer: B. Autonomy
Rationale: Respect for patient autonomy includes the right to control access to their health information.
The spouse's request without the patient's knowledge violates the patient's autonomy and confidentiality.
Nonmaleficence (do no harm) and beneficence (do good) are less directly relevant; justice concerns
fairness in distribution of care. The primary duty here is to uphold the patient's decision regarding
disclosure.
Why Wrong:
A - Nonmaleficence focuses on avoiding harm, but the main issue is the patient's right to privacy and
control.
C - Beneficence would require acting in the patient's best interest, which may support
confidentiality, but autonomy is the key principle.
D - Justice pertains to equitable treatment, not to individual privacy rights.
Reference: American Dental Hygienists' Association (2024). ADHA Code of Ethics, Section 2.1.
Page 4
