ABOMS Oral & Maxillofacial Surgery Exam
2026 | Practice Questions, Verified Answers
& Detailed Rationales | OMS Board
Certification Prep
ABOMS ORAL & MAXILLOFACIAL SURGERY EXAM 2026 | PRACTICE QUESTIONS,
VERIFIED ANSWERS & DETAILED RATIONALES | OMS BOARD CERTIFICATION
PREP
OVERVIEW
• This comprehensive practice exam contains meticulously crafted questions
covering all major domains of the ABOMS certification, including pathology, surgical
techniques, anesthesia, trauma management, implantology, and advanced
reconstructive procedures—designed to strengthen knowledge retention and
clinical decision-making.
• Study this material by reviewing each question carefully, attempting answers
before checking the verified solution, and using the detailed rationales to
understand the clinical reasoning and evidence-based principles behind each
correct answer.
QUESTION 1
Which of the following is the most common odontogenic tumor of the jaws?
A) Ameloblastic fibroma
B) Adenomatoid odontogenic tumor
C) Odontoma
D) Ameloblastoma
E) Keratocystic odontogenic tumor
,✓ CORRECT ANSWER: C) Odontoma
RATIONALE: Odontomas are the most frequently encountered odontogenic tumors,
accounting for approximately 20-30% of all odontogenic tumors. They are benign
hamartomatous lesions that develop from odontogenic epithelium and
ectomesenchymal tissues. Odontomas typically occur in the second and third
decades of life and are often discovered incidentally on radiographs. They are
classified as compound odontomas (which resemble miniature teeth) and complex
odontomas (which show no tooth-like structure). These lesions are non-aggressive,
corticated, and rarely require extensive surgical intervention beyond simple
enucleation. While ameloblastomas are more clinically significant due to their
aggressive nature, odontomas are statistically more common in the population.
QUESTION 2
What is the primary mechanism of action of local anesthetic agents?
A) Inhibition of calcium channel influx
B) Blockade of sodium channel efflux
C) Inhibition of sodium channel influx
D) Enhancement of potassium channel outflow
E) Direct membrane depolarization
✓ CORRECT ANSWER: C) Inhibition of sodium channel influx
RATIONALE: Local anesthetic agents work by blocking sodium channels in the
neuronal cell membrane, preventing the influx of sodium ions. This inhibition
prevents depolarization of the nerve membrane, which is essential for action
potential generation and nerve impulse transmission. By stabilizing the neuronal
membrane and raising the threshold for electrical excitability, local anesthetics
effectively interrupt pain signal transmission. This mechanism applies to all local
anesthetics used in maxillofacial surgery, including lidocaine, articaine, bupivacaine,
,and prilocaine. The blockade occurs from the intracellular side of the sodium
channel, and agents must penetrate the nerve sheath to reach their site of action.
QUESTION 3
A 45-year-old patient presents with a painless swelling over the anterior
mandible. Radiographically, there is a well-defined, unilocular radiolucency
associated with the root apices of non-vital teeth. What is the most likely
diagnosis?
A) Odontogenic keratocyst
B) Radicular cyst
C) Residual cyst
D) Dentigerous cyst
E) Nasopalatine duct cyst
✓ CORRECT ANSWER: B) Radicular cyst
RATIONALE: A radicular cyst is the most common odontogenic cyst, originating from
epithelial remnants (cell rests of Malassez) in the periodontal ligament following the
death of the pulp. It is always associated with a non-vital tooth and typically
appears as a well-defined, unilocular radiolucency at the apex of the affected tooth.
The lesion develops as a consequence of periapical inflammation. Radicular cysts
are usually asymptomatic unless secondarily infected and are most commonly
found in the anterior region of the mandible, particularly around lower incisors.
Treatment typically involves either endodontic therapy with observation or surgical
enucleation. The presence of non-vital teeth is the key clinical finding that
distinguishes radicular cysts from other periapical pathology.
QUESTION 4
, Which fracture classification system is most commonly used for mandibular
condylar fractures in adult patients?
A) Helkimo classification
B) Spiessl and Schroll classification
C) Angle classification
D) Le Fort classification
E) Salter-Harris classification
✓ CORRECT ANSWER: B) Spiessl and Schroll classification
RATIONALE: The Spiessl and Schroll classification is the most widely accepted
system for categorizing mandibular condylar fractures in adults, based on the
anatomical location and displacement of fracture fragments. This classification
divides condylar fractures into: (1) fractures at the condylar head level, (2) fractures
at the condylar neck level, (3) fractures at the subcondylar region, and (4) fractures
involving the ramus and body. This classification system helps guide treatment
decisions and predict functional outcomes. While other classification systems exist,
Spiessl and Schroll provides the most practical and clinically relevant framework for
treatment planning and prognostication. The Helkimo classification relates to
temporomandibular dysfunction, not condylar fractures.
QUESTION 5
What is the maximum recommended dose of lidocaine with epinephrine for a
healthy adult patient during a single appointment?
A) 3 mg/kg (maximum 300 mg)
B) 4.5 mg/kg (maximum 400 mg)
C) 7 mg/kg (maximum 500 mg)
D) 10 mg/kg (maximum 600 mg)
2026 | Practice Questions, Verified Answers
& Detailed Rationales | OMS Board
Certification Prep
ABOMS ORAL & MAXILLOFACIAL SURGERY EXAM 2026 | PRACTICE QUESTIONS,
VERIFIED ANSWERS & DETAILED RATIONALES | OMS BOARD CERTIFICATION
PREP
OVERVIEW
• This comprehensive practice exam contains meticulously crafted questions
covering all major domains of the ABOMS certification, including pathology, surgical
techniques, anesthesia, trauma management, implantology, and advanced
reconstructive procedures—designed to strengthen knowledge retention and
clinical decision-making.
• Study this material by reviewing each question carefully, attempting answers
before checking the verified solution, and using the detailed rationales to
understand the clinical reasoning and evidence-based principles behind each
correct answer.
QUESTION 1
Which of the following is the most common odontogenic tumor of the jaws?
A) Ameloblastic fibroma
B) Adenomatoid odontogenic tumor
C) Odontoma
D) Ameloblastoma
E) Keratocystic odontogenic tumor
,✓ CORRECT ANSWER: C) Odontoma
RATIONALE: Odontomas are the most frequently encountered odontogenic tumors,
accounting for approximately 20-30% of all odontogenic tumors. They are benign
hamartomatous lesions that develop from odontogenic epithelium and
ectomesenchymal tissues. Odontomas typically occur in the second and third
decades of life and are often discovered incidentally on radiographs. They are
classified as compound odontomas (which resemble miniature teeth) and complex
odontomas (which show no tooth-like structure). These lesions are non-aggressive,
corticated, and rarely require extensive surgical intervention beyond simple
enucleation. While ameloblastomas are more clinically significant due to their
aggressive nature, odontomas are statistically more common in the population.
QUESTION 2
What is the primary mechanism of action of local anesthetic agents?
A) Inhibition of calcium channel influx
B) Blockade of sodium channel efflux
C) Inhibition of sodium channel influx
D) Enhancement of potassium channel outflow
E) Direct membrane depolarization
✓ CORRECT ANSWER: C) Inhibition of sodium channel influx
RATIONALE: Local anesthetic agents work by blocking sodium channels in the
neuronal cell membrane, preventing the influx of sodium ions. This inhibition
prevents depolarization of the nerve membrane, which is essential for action
potential generation and nerve impulse transmission. By stabilizing the neuronal
membrane and raising the threshold for electrical excitability, local anesthetics
effectively interrupt pain signal transmission. This mechanism applies to all local
anesthetics used in maxillofacial surgery, including lidocaine, articaine, bupivacaine,
,and prilocaine. The blockade occurs from the intracellular side of the sodium
channel, and agents must penetrate the nerve sheath to reach their site of action.
QUESTION 3
A 45-year-old patient presents with a painless swelling over the anterior
mandible. Radiographically, there is a well-defined, unilocular radiolucency
associated with the root apices of non-vital teeth. What is the most likely
diagnosis?
A) Odontogenic keratocyst
B) Radicular cyst
C) Residual cyst
D) Dentigerous cyst
E) Nasopalatine duct cyst
✓ CORRECT ANSWER: B) Radicular cyst
RATIONALE: A radicular cyst is the most common odontogenic cyst, originating from
epithelial remnants (cell rests of Malassez) in the periodontal ligament following the
death of the pulp. It is always associated with a non-vital tooth and typically
appears as a well-defined, unilocular radiolucency at the apex of the affected tooth.
The lesion develops as a consequence of periapical inflammation. Radicular cysts
are usually asymptomatic unless secondarily infected and are most commonly
found in the anterior region of the mandible, particularly around lower incisors.
Treatment typically involves either endodontic therapy with observation or surgical
enucleation. The presence of non-vital teeth is the key clinical finding that
distinguishes radicular cysts from other periapical pathology.
QUESTION 4
, Which fracture classification system is most commonly used for mandibular
condylar fractures in adult patients?
A) Helkimo classification
B) Spiessl and Schroll classification
C) Angle classification
D) Le Fort classification
E) Salter-Harris classification
✓ CORRECT ANSWER: B) Spiessl and Schroll classification
RATIONALE: The Spiessl and Schroll classification is the most widely accepted
system for categorizing mandibular condylar fractures in adults, based on the
anatomical location and displacement of fracture fragments. This classification
divides condylar fractures into: (1) fractures at the condylar head level, (2) fractures
at the condylar neck level, (3) fractures at the subcondylar region, and (4) fractures
involving the ramus and body. This classification system helps guide treatment
decisions and predict functional outcomes. While other classification systems exist,
Spiessl and Schroll provides the most practical and clinically relevant framework for
treatment planning and prognostication. The Helkimo classification relates to
temporomandibular dysfunction, not condylar fractures.
QUESTION 5
What is the maximum recommended dose of lidocaine with epinephrine for a
healthy adult patient during a single appointment?
A) 3 mg/kg (maximum 300 mg)
B) 4.5 mg/kg (maximum 400 mg)
C) 7 mg/kg (maximum 500 mg)
D) 10 mg/kg (maximum 600 mg)
