Free Practice Questions for NBDE Part I
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Key Facts: NBDE Part I Exam
July 31, 2020
Last NBDE Part I Date
JCNDE History & Timeline
Aug 1, 2020
INBDE Launch
JCNDE History & Timeline
500
Current INBDE Questions
INBDE Candidate Guide (updated 2025-12-15)
12h
Total Appointment Time
INBDE Candidate Guide (updated 2025-12-15)
$890
Current Exam Fee
INBDE Candidate Guide (updated 2025-12-15)
4
Legacy Foundational Domains
NBDE Part I-style content structure
JCNDE's official timeline states the last NBDE Part I administration was July 31, 2020, and the INBDE launched August 1, 2020. The current candidate guide (updated December 15, 2025) lists a 12-hour appointment, 500 total questions (360 Day 1 + 140 Day 2), and an $890 exam fee. Use this page as a legacy foundational-science bridge aligned to modern integrated board expectations.
Sample NBDE Part I Practice Questions
Try these sample questions to review concepts for the NBDE Part I exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.
1Case 001: A mandibular anesthesia complication is being reviewed after a restorative appointment. Which branch of CN V3 provides primary sensory innervation to the lower lip and chin? (during initial chart review).
2Case 002: A mandibular anesthesia complication is being reviewed after a restorative appointment. Which branch of CN V3 provides primary sensory innervation to the lower lip and chin? (while working through a board-style vignette).
3Case 003: A mandibular anesthesia complication is being reviewed after a restorative appointment. Which branch of CN V3 provides primary sensory innervation to the lower lip and chin? (in a timed foundational-science set).
4Case 004: A mandibular anesthesia complication is being reviewed after a restorative appointment. Which branch of CN V3 provides primary sensory innervation to the lower lip and chin? (during final exam-week consolidation).
5Case 005: A mandibular anesthesia complication is being reviewed after a restorative appointment. Which branch of CN V3 provides primary sensory innervation to the lower lip and chin? (in an integrated clinical-decision scenario).
6Case 006: A third-molar extraction consent discussion highlights lingual-side surgical risk. Which structure is most vulnerable on the lingual aspect of the mandibular third-molar area? (during initial chart review).
7Case 007: A third-molar extraction consent discussion highlights lingual-side surgical risk. Which structure is most vulnerable on the lingual aspect of the mandibular third-molar area? (while working through a board-style vignette).
8Case 008: A third-molar extraction consent discussion highlights lingual-side surgical risk. Which structure is most vulnerable on the lingual aspect of the mandibular third-molar area? (in a timed foundational-science set).
9Case 009: A third-molar extraction consent discussion highlights lingual-side surgical risk. Which structure is most vulnerable on the lingual aspect of the mandibular third-molar area? (during final exam-week consolidation).
10Case 010: A third-molar extraction consent discussion highlights lingual-side surgical risk. Which structure is most vulnerable on the lingual aspect of the mandibular third-molar area? (in an integrated clinical-decision scenario).
About the NBDE Part I Exam
NBDE Part I is a legacy exam, but its core biomedical science domains remain high-yield for modern dental board prep. This bank focuses on anatomic sciences, biochemistry/physiology, microbiology/pathology, and dental anatomy/occlusion for foundational mastery.
Exam sponsor: JCNDE / ADA DTS / Pearson VUE. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Questions
500 questions
Time Limit
12-hour total appointment (current INBDE format)
Passing Score
Legacy NBDE Part I retired; INBDE reports Pass/Fail
Reported exam pass rate: ~95%. first-time from accredited programs (historical; now replaced by INBDE) This describes exam candidates, not OpenExamPrep users or results from using our resources. Exam sponsor website
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Our practice resources: topics covered
We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.
Anatomic Sciences
Head and neck anatomy, neuroanatomy, embryology, and oral histology principles
Biochemistry & Physiology
Metabolism, acid-base regulation, endocrine control, and systems physiology
Microbiology & Pathology
Oral pathogens, host response, inflammation, neoplasia, and lesion triage
Dental Anatomy & Occlusion
Tooth morphology, eruption, occlusal relationships, and prosthodontic occlusal concepts
Preparing for the NBDE Part I Exam
What You Need to Know
- Passing score: Legacy NBDE Part I retired; INBDE reports Pass/Fail
- Exam length: 500 questions
- Time limit: 12-hour total appointment (current INBDE format)
- Exam / certification fees: $890 Official sources
Using Our Practice Resources
- Work through all 200 available questions
- Review every answer and explanation
- Track weak areas and revisit them
- Use our AI tutor for tough concepts
NBDE Part I: Suggested Study Strategy
Frequently Asked Questions
Is NBDE Part I still administered in 2026?
No. JCNDE's official timeline states the final NBDE Part I administration date was July 31, 2020.
What replaced NBDE Part I and NBDE Part II?
The Integrated National Board Dental Examination (INBDE) replaced NBDE Part I and Part II, with implementation on August 1, 2020.
What is the current written dental board format?
The current candidate guide (updated December 15, 2025) lists the INBDE as a 12-hour appointment with 500 total questions: 360 on Day 1 and 140 on Day 2.
What is the 2026 exam fee?
The INBDE candidate guide lists an exam fee of $890.
Why study NBDE Part I topics if the exam is retired?
Because the same foundational sciences still underpin modern integrated board reasoning. Strong anatomy, physiology, pathology, and occlusion fundamentals improve clinical item performance.
How should I use this question bank?
Use mixed timed sets, review rationales deeply, and rotate weak domains every 48-72 hours. Prioritize mechanism-level understanding rather than memorizing isolated facts.