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Key Facts: ABOMR Exam
Multi-day
Part 1 CBT
ABOMR
ACBOMR 2026
Transitioning To
Board name change
2.5 mm Al
FDA Filtration >70 kVp
Federal requirement
3 yrs
OMFR Residency
Application requirement
ABOMR is the OMFR specialty board (NCRDSCB recognition withdrawn; transitioning to ACBOMR 2026). Part 1 multi-day CBT MCQ. Master x-ray production (bremsstrahlung + characteristic), HVL filtration (2.5 mm Al >70 kVp), CBCT FOV selection, OKC/dentigerous/ameloblastoma radiographic patterns, MRONJ criteria, TMJ MRI dynamic imaging, and ALARA dose reduction.
Sample ABOMR Practice Questions
Try these sample questions to review concepts for the ABOMR exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.
1Which interaction in the x-ray tube target is primarily responsible for the continuous portion of the dental x-ray spectrum?
2Increasing kVp in a dental x-ray exposure primarily affects which beam characteristic?
3At dental kVps above 70, which photon-tissue interaction predominates and is responsible for most scattered radiation?
4FDA-required minimum total aluminum filtration for a dental x-ray unit operating above 70 kVp is:
5If the source-to-receptor distance is doubled, the radiation intensity at the receptor will be:
6Switching from D-speed (Ultraspeed) to F-speed (Insight) film produces approximately what reduction in patient dose?
7The unit of effective dose, accounting for radiation type and tissue radiosensitivity, is:
8Approximate effective dose for a digital full-mouth radiographic series (FMX) using rectangular collimation is closest to:
9Which biological effect is best described as STOCHASTIC and follows a linear no-threshold (LNT) model in radiation protection?
10Compared with adults, children are more radiosensitive primarily because:
About the ABOMR Exam
ABOMR Diplomate certification for Oral and Maxillofacial Radiology specialists — board still administering Diplomate exams (transitioning to ACBOMR in 2026); NCRDSCB recognition was withdrawn but the credential remains active for OMFR residency-trained dentists. Two-part exam: Part 1 multi-day CBT MCQ; Part 2 MCQ + short answer with radiographic interpretation. Covers radiation physics + biology, radiologic anatomy, intra/extraoral techniques, CBCT and 3D imaging, radiographic pathology, systemic imaging (TMJ MRI, sialography), and radiation protection.
Exam sponsor: ABOMR (transitioning to ACBOMR 2026). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.
Questions
100 questions
Time Limit
Multi-day (per ABOMR)
Passing Score
Per ABOMR (sectional pass/fail)
Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.
Official sources
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.
CBCT & 3D Imaging
CBCT principles, FOV selection, artifacts, MSCT vs CBCT, indications/limitations
Radiographic Pathology
OKC, dentigerous, periapical cysts, ameloblastoma, OFD, osteomyelitis, MRONJ
Radiation Physics & Biology
Bremsstrahlung, HVL filtration, photoelectric vs Compton, deterministic/stochastic effects
Radiologic Anatomy
Mental foramen, IAN canal, max sinus, TMJ, CBCT anatomy landmarks
Intra/Extraoral Techniques
Paralleling vs bisecting, BWX, PA, pano, ceph, occlusal, technique errors
Systemic & Adjunct Imaging
TMJ MRI, sialography, salivary gland imaging, head/neck MRI/CT basics
Radiation Protection & Regulation
ALARA, ICRP, NCRP, FDA, CDC, dose limits
Preparing for the ABOMR Exam
What You Need to Know
- Passing score: Per ABOMR (sectional pass/fail)
- Exam length: 100 questions
- Time limit: Multi-day (per ABOMR)
- Exam / certification fees: Per ABOMR Official sources
Using Our Practice Resources
- Work through all 100 available questions
- Review every answer and explanation
- Track weak areas and revisit them
- Use our AI tutor for tough concepts
ABOMR: Suggested Study Strategy
Frequently Asked Questions
What is the FDA minimum aluminum filtration requirement?
FDA-required total aluminum filtration in dental x-ray tubes: 0.5 mm Al for ≤50 kVp; 1.5 mm Al for 51-70 kVp; 2.5 mm Al for >70 kVp. Filtration removes low-energy x-rays that would be absorbed by patient skin without contributing to image — reduces patient dose without reducing diagnostic quality. Total filtration = inherent (tube + collimator) + added (Al disc).
How do you select CBCT field of view (FOV)?
CBCT FOV selection follows ALARA: use the SMALLEST FOV that captures the region of interest. Small FOV (5×5 cm) — single endo case, single tooth analysis. Medium FOV (8×8 cm) — implant planning quadrant or sextant. Large FOV (16×8 cm or larger) — full max + mand, TMJ bilateral, orthognathic planning, multiple impactions. Larger FOV = higher dose to patient. Document FOV selection rationale.
What distinguishes an OKC from a dentigerous cyst radiographically?
Dentigerous cyst: pericoronal radiolucency surrounding the CROWN of an unerupted tooth, attached at CEJ; most often max canine, mand 3rd molar; corticated borders, expansion. OKC (Odontogenic Keratocyst, now KCOT in older terminology): unilocular OR multilocular radiolucency, may be pericoronal but typically mandibular ramus; expands ALONG the bone axis (anteroposterior > buccolingual) with minimal cortical perforation; high recurrence rate (~30%); associated with PTCH gene mutations in Gorlin syndrome (NBCCS) when multiple.
How should I study for ABOMR Part 1?
Plan 500-1,000 hours over OMFR residency. Master White & Pharoah Oral Radiology: Principles and Interpretation (current edition) cover-to-cover — primary text. Read Mallya & Lam Diagnostic Imaging Oral & Maxillofacial. Study CBCT physics + artifacts (Scarfe textbook). Build a personal radiographic pathology image library: 100+ each of OKC, dentigerous, ameloblastoma, periapical, MRONJ, osteomyelitis. Case logs and publications required for board application.