ABDSM EXAM 2026-2027 LATEST ACTUAL EXAM
QUESTIONS
AND DETAILED CORRECT ANSWERS
Comprehensive Assessment
Year: 2026–2027 | Total Questions: 150 | 100% VERIFIED
Introduction
The American Board of Dental Sleep Medicine (ABDSM) examination is the definitive board
certification assessment for dental professionals specializing in the management of sleep-
disordered breathing through oral appliance therapy. This comprehensive question bank
covers all key domains of the official ABDSM blueprint: (1) Sleep-Disordered Breathing and
Obstructive Sleep Apnea, encompassing OSA pathophysiology, diagnostic criteria, severity
classification, risk factors, cardiovascular consequences, and screening tools; (2) Oral
Appliance Therapy (OAT) Fabrication and Titration, addressing mandibular advancement
device design, impression techniques, bite registration, titration protocols, side effect
management, and long-term occlusal monitoring; (3) CPAP and Alternative Therapies,
covering positive airway pressure devices, surgical options, positional therapy, weight
management, hypoglossal nerve stimulation, and combination approaches; (4) Sleep
Architecture and Polysomnography Interpretation, including sleep staging, respiratory
event scoring, AHI/RDI calculation, home sleep testing, and MSLT protocols; (5)
Craniofacial Anatomy and Airway Assessment, addressing retropalatal and retroglossal
anatomy, cephalometric analysis, Mallampati and Friedman classification, CBCT imaging,
and drug-induced sleep endoscopy; (6) Dental Sleep Medicine Ethics, encompassing
informed consent, interdisciplinary collaboration, scope limitations, evidence-based
methodology, advertising standards, and professional conduct; and (7) Patient Follow-up,
covering efficacy testing, occlusal change monitoring, TMJ assessment, adherence
evaluation, long-term management, and inter-provider communication. Each of the 150
questions is mapped to a distinct sub-topic within the ABDSM domain blueprint, ensuring
thorough, non-overlapping coverage. Mastery of these domains demonstrates professional
readiness for competent, ethical, and evidence-based clinical dental sleep medicine
execution.
Question 1: The Apnea-Hypopnea Index (AHI) is defined as the number of apneas and
hypopneas per:
A. Per 24 hours of monitoring
, B. Per 100 heartbeats on ECG
C. Hour of sleep recorded during polysomnography
D. Minute of REM sleep only
Correct Answer: C. Hour of sleep recorded during polysomnography
Rationale: AHI = total apneas + hypopneas divided by total hours of sleep. It is not
calculated per 24 hours (A), per minute of REM only (C), or per heartbeats (D).
Question 2: According to AASM guidelines, mild obstructive sleep apnea in an adult is
classified as an AHI of:
A. Less than 5 events per hour
B. 5 to 14 events per hour
C. 30 or more events per hour
D. 15 to 29 events per hour
Correct Answer: B. 5 to 14 events per hour
Rationale: Mild OSA: AHI 5-14. Less than 5 (A) is normal. 15-29 (C) is moderate. ≥30 (D) is
severe.
Question 3: The MOST significant modifiable risk factor for obstructive sleep apnea is:
A. Male sex
B. Family history of OSA
C. Obesity
D. Age
Correct Answer: C. Obesity
Rationale: Obesity is the most important modifiable risk factor; weight reduction can
significantly decrease AHI. Age (A), sex (C), and family history (D) are non-modifiable.
Question 4: Obstructive sleep apnea is caused by:
A. Primary cardiac rhythm disturbances
, B. Chronic obstructive pulmonary disease exclusively
C. Repetitive partial or complete collapse of the upper airway during sleep
despite continued respiratory effort
D. Failure of the central respiratory drive in the brainstem
Correct Answer: C. Repetitive partial or complete collapse of the upper airway during
sleep despite continued respiratory effort
Rationale: OSA involves pharyngeal collapse with ongoing effort. Central respiratory drive
failure (A) causes central sleep apnea. COPD (C) and cardiac disturbances (D) are separate
conditions.
Question 5: The Epworth Sleepiness Scale (ESS) measures:
A. Objective sleep architecture through EEG analysis
B. Nocturnal oxygen saturation levels
C. The number of periodic limb movements per hour
D. Subjective daytime sleepiness by asking the patient to rate their likelihood of
dozing in eight common situations
Correct Answer: D. Subjective daytime sleepiness by asking the patient to rate their
likelihood of dozing in eight common situations
Rationale: ESS is a validated subjective questionnaire. It does not objectively measure sleep
architecture (A), oxygen levels (C), or limb movements (D).
Question 6: Upper airway resistance syndrome (UARS) differs from obstructive sleep
apnea in that UARS patients typically:
A. Never experience daytime sleepiness or fatigue
B. Have an AHI above 30 events per hour with severe desaturations
C. Have exclusively central apneas without any obstructive component
D. Show increased respiratory effort leading to arousals without meeting formal
criteria for apneas or hypopneas, often with a normal AHI
Correct Answer: D. Show increased respiratory effort leading to arousals without
meeting formal criteria for apneas or hypopneas, often with a normal AHI
, Rationale: UARS shows effort-related arousals without frank apnea/hypopnea events. High
AHI with desaturations (A) describes severe OSA. Central events (C) describe CSA. UARS
does cause daytime symptoms (D).
Question 7: Untreated obstructive sleep apnea is independently associated with increased
risk of:
A. Decreased cardiovascular morbidity
B. Systemic hypertension, atrial fibrillation, stroke, heart failure, and motor
vehicle accidents
C. Improved cognitive function over time
D. Enhanced athletic performance
Correct Answer: B. Systemic hypertension, atrial fibrillation, stroke, heart failure, and
motor vehicle accidents
Rationale: OSA significantly increases cardiovascular and accident risk. It does not improve
cognition (A), decrease cardiovascular risk (C), or enhance performance (D).
Question 8: The STOP-BANG questionnaire is a validated screening tool for:
A. Obstructive sleep apnea risk, using criteria including Snoring, Tiredness,
Observed apneas, Pressure (blood pressure), BMI, Age, Neck circumference, and
Gender
B. Periodontal disease staging
C. Depression and anxiety disorders
D. Dental caries risk assessment
Correct Answer: A. Obstructive sleep apnea risk, using criteria including Snoring,
Tiredness, Observed apneas, Pressure (blood pressure), BMI, Age, Neck
circumference, and Gender
Rationale: STOP-BANG screens for OSA risk. It does not screen for mood disorders (A),
caries (C), or periodontal disease (D).
Question 9: The oxygen desaturation index (ODI) in the context of sleep apnea represents:
A. The maximum oxygen saturation achieved during the study
QUESTIONS
AND DETAILED CORRECT ANSWERS
Comprehensive Assessment
Year: 2026–2027 | Total Questions: 150 | 100% VERIFIED
Introduction
The American Board of Dental Sleep Medicine (ABDSM) examination is the definitive board
certification assessment for dental professionals specializing in the management of sleep-
disordered breathing through oral appliance therapy. This comprehensive question bank
covers all key domains of the official ABDSM blueprint: (1) Sleep-Disordered Breathing and
Obstructive Sleep Apnea, encompassing OSA pathophysiology, diagnostic criteria, severity
classification, risk factors, cardiovascular consequences, and screening tools; (2) Oral
Appliance Therapy (OAT) Fabrication and Titration, addressing mandibular advancement
device design, impression techniques, bite registration, titration protocols, side effect
management, and long-term occlusal monitoring; (3) CPAP and Alternative Therapies,
covering positive airway pressure devices, surgical options, positional therapy, weight
management, hypoglossal nerve stimulation, and combination approaches; (4) Sleep
Architecture and Polysomnography Interpretation, including sleep staging, respiratory
event scoring, AHI/RDI calculation, home sleep testing, and MSLT protocols; (5)
Craniofacial Anatomy and Airway Assessment, addressing retropalatal and retroglossal
anatomy, cephalometric analysis, Mallampati and Friedman classification, CBCT imaging,
and drug-induced sleep endoscopy; (6) Dental Sleep Medicine Ethics, encompassing
informed consent, interdisciplinary collaboration, scope limitations, evidence-based
methodology, advertising standards, and professional conduct; and (7) Patient Follow-up,
covering efficacy testing, occlusal change monitoring, TMJ assessment, adherence
evaluation, long-term management, and inter-provider communication. Each of the 150
questions is mapped to a distinct sub-topic within the ABDSM domain blueprint, ensuring
thorough, non-overlapping coverage. Mastery of these domains demonstrates professional
readiness for competent, ethical, and evidence-based clinical dental sleep medicine
execution.
Question 1: The Apnea-Hypopnea Index (AHI) is defined as the number of apneas and
hypopneas per:
A. Per 24 hours of monitoring
, B. Per 100 heartbeats on ECG
C. Hour of sleep recorded during polysomnography
D. Minute of REM sleep only
Correct Answer: C. Hour of sleep recorded during polysomnography
Rationale: AHI = total apneas + hypopneas divided by total hours of sleep. It is not
calculated per 24 hours (A), per minute of REM only (C), or per heartbeats (D).
Question 2: According to AASM guidelines, mild obstructive sleep apnea in an adult is
classified as an AHI of:
A. Less than 5 events per hour
B. 5 to 14 events per hour
C. 30 or more events per hour
D. 15 to 29 events per hour
Correct Answer: B. 5 to 14 events per hour
Rationale: Mild OSA: AHI 5-14. Less than 5 (A) is normal. 15-29 (C) is moderate. ≥30 (D) is
severe.
Question 3: The MOST significant modifiable risk factor for obstructive sleep apnea is:
A. Male sex
B. Family history of OSA
C. Obesity
D. Age
Correct Answer: C. Obesity
Rationale: Obesity is the most important modifiable risk factor; weight reduction can
significantly decrease AHI. Age (A), sex (C), and family history (D) are non-modifiable.
Question 4: Obstructive sleep apnea is caused by:
A. Primary cardiac rhythm disturbances
, B. Chronic obstructive pulmonary disease exclusively
C. Repetitive partial or complete collapse of the upper airway during sleep
despite continued respiratory effort
D. Failure of the central respiratory drive in the brainstem
Correct Answer: C. Repetitive partial or complete collapse of the upper airway during
sleep despite continued respiratory effort
Rationale: OSA involves pharyngeal collapse with ongoing effort. Central respiratory drive
failure (A) causes central sleep apnea. COPD (C) and cardiac disturbances (D) are separate
conditions.
Question 5: The Epworth Sleepiness Scale (ESS) measures:
A. Objective sleep architecture through EEG analysis
B. Nocturnal oxygen saturation levels
C. The number of periodic limb movements per hour
D. Subjective daytime sleepiness by asking the patient to rate their likelihood of
dozing in eight common situations
Correct Answer: D. Subjective daytime sleepiness by asking the patient to rate their
likelihood of dozing in eight common situations
Rationale: ESS is a validated subjective questionnaire. It does not objectively measure sleep
architecture (A), oxygen levels (C), or limb movements (D).
Question 6: Upper airway resistance syndrome (UARS) differs from obstructive sleep
apnea in that UARS patients typically:
A. Never experience daytime sleepiness or fatigue
B. Have an AHI above 30 events per hour with severe desaturations
C. Have exclusively central apneas without any obstructive component
D. Show increased respiratory effort leading to arousals without meeting formal
criteria for apneas or hypopneas, often with a normal AHI
Correct Answer: D. Show increased respiratory effort leading to arousals without
meeting formal criteria for apneas or hypopneas, often with a normal AHI
, Rationale: UARS shows effort-related arousals without frank apnea/hypopnea events. High
AHI with desaturations (A) describes severe OSA. Central events (C) describe CSA. UARS
does cause daytime symptoms (D).
Question 7: Untreated obstructive sleep apnea is independently associated with increased
risk of:
A. Decreased cardiovascular morbidity
B. Systemic hypertension, atrial fibrillation, stroke, heart failure, and motor
vehicle accidents
C. Improved cognitive function over time
D. Enhanced athletic performance
Correct Answer: B. Systemic hypertension, atrial fibrillation, stroke, heart failure, and
motor vehicle accidents
Rationale: OSA significantly increases cardiovascular and accident risk. It does not improve
cognition (A), decrease cardiovascular risk (C), or enhance performance (D).
Question 8: The STOP-BANG questionnaire is a validated screening tool for:
A. Obstructive sleep apnea risk, using criteria including Snoring, Tiredness,
Observed apneas, Pressure (blood pressure), BMI, Age, Neck circumference, and
Gender
B. Periodontal disease staging
C. Depression and anxiety disorders
D. Dental caries risk assessment
Correct Answer: A. Obstructive sleep apnea risk, using criteria including Snoring,
Tiredness, Observed apneas, Pressure (blood pressure), BMI, Age, Neck
circumference, and Gender
Rationale: STOP-BANG screens for OSA risk. It does not screen for mood disorders (A),
caries (C), or periodontal disease (D).
Question 9: The oxygen desaturation index (ODI) in the context of sleep apnea represents:
A. The maximum oxygen saturation achieved during the study
