100+ Free ABOMR Practice Questions
Pass your ABOMR American Board of Oral and Maxillofacial Radiology exam on the first try — instant access, no signup required.
Rectangular collimation compared with round collimation reduces patient effective dose by approximately:
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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ABOMR is the OMFR specialty board (NCRDSCB recognition withdrawn; transitioning to ACBOMR 2026).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 test your ABOMR exam readiness. 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specialists — board still administering Diplomate exams (transitioning to ACBOMR in 2026); NCRDSCB recognition was withdrawn but the credential remains active for OMFR residency-trained dentists.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.
Questions
100 scored questions
Time Limit
Multi-day (per ABOMR)
Passing Score
Per ABOMR (sectional pass/fail)
Exam Fee
Per ABOMR (ABOMR (transitioning to ACBOMR 2026))
ABOMR Exam Content Outline
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
How to Pass 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 fee: Per ABOMR
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
ABOMR Study Tips from Top Performers
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.