ABDSM Final Exam Review: 300
Board Practice Questions And Well
Graded Solutions With Rationales
Updated 2026 2027
Pass your ABDSM Final Exam with this definitive study guide containing 300
board-style multiple-choice questions. Covers all high-yield blueprints: upper
airway anatomy, polysomnography (PSG/HSAT) interpretation, oral appliance
therapy (OAT) titration, titration mechanics, managing side effects, and
medical billing codes. Each question includes verified correct answers and
detailed rationales. Perfect for both Traditional and Mastery Track candidates
aiming for Diplomate status.
Question 1: Which of the following landmarks is most critical when evaluating a
patient’s airway during an initial clinical sleep screening?
A) The position of the hyoid bone relative to the clavicle
B) The length of the mandibular condyle
C) The Mallampati classification score
D) The width of the attached gingiva on mandibular molars
Rationale: The Mallampati score provides a direct visual assessment of the space
between the tongue and the soft palate, helping clinicians gauge potential upper
airway crowding and risk for collapse.
1|Page
,Question 2: What is the primary mechanism of action by which a custom mandibular
advancement device successfully treats obstructive sleep apnea?
A) Rigidly locking the temporomandibular joint to prevent mouth opening
B) Forward advancement of the mandible to pull the tongue and epiglottis
away from the posterior pharyngeal wall
C) Direct mechanical suppression of the uvula and soft palate tissues
D) Increasing lateral expansion of the hard palate through skeletal forces
Rationale: Advancing the mandible anteriorly stretches the palatoglossus and
genioglossus muscles, widening the velopharyngeal and oropharyngeal airway
spaces to keep the airway patent during sleep.
Question 3: A patient exhibits severe periodontal bone loss around the mandibular
incisors. How does this finding impact the planning for oral appliance therapy?
A) It serves as a relative contraindication, requiring periodontal stabilization
and potential appliance modifications to redistribute forces
B) It is an absolute contraindication, requiring the patient to use CPAP therapy
exclusively
C) It has no impact on therapy because appliances only exert force on posterior
teeth
D) It requires immediate referral for a full-mouth dental extraction protocol
Rationale: Mandibular advancement appliances place reciprocal posterior-directed
forces on the anterior teeth. Compromised periodontal support requires structural
stabilization and force redistribution across healthier teeth before or during device
wear.
Question 4: Which parameter on a polysomnography report specifically measures
the average number of pauses in breathing per hour that last at least 10 seconds
and are accompanied by an oxygen desaturation of 3% or more?
A) Respiratory Disturbance Index (RDI)
B) Apnea-Hypopnea Index (AHI)
C) Oxygen Desaturation Index (ODI)
D) Total Sleep Time (TST)
Rationale: The AHI is the universally accepted standard metric that tallies the
combined total of apneas (complete airflow cessation) and hypopneas (partial airflow
reduction) per hour of sleep.
Question 5: During a 1-month titration follow-up, a patient reports persistent daytime
sleepiness despite wearing the appliance for 7 hours nightly. The bed partner notes
that snoring has completely stopped. What should be the clinician's next logical
step?
A) Instruct the patient to immediately advance the appliance another 3mm
B) Inform the patient that oral appliance therapy has failed and discontinue treatment
C) Order an objective efficacy sleep study with the appliance in place to verify
actual AHI reduction
D) Assume the sleepiness is entirely unrelated to sleep apnea and refer to a
neurologist
Rationale: The resolution of snoring does not always guarantee that silent
obstructive hypopneas or micro-arousals have been eliminated. An objective sleep
study (HSAT or PSG) is required to evaluate actual therapeutic efficacy.
Question 6: Which medical condition is most frequently associated with untreated,
chronic obstructive sleep apnea due to constant sympathetic nervous system surges
2|Page
,during sleep?
A) Osteoarthritis
B) Chronic obstructive pulmonary disease
C) Drug-resistant systemic hypertension
D) Type 1 diabetes mellitus
Rationale: Frequent nighttime arousals and hypoxic episodes trigger repetitive
surges in adrenaline and cortisol, heavily contributing to persistent elevated blood
pressure that resists standard drug therapies.
Question 7: A patient experiences severe, sharp bilateral pain in the preauricular
region every morning upon removing their mandibular advancement device. The
pain lingers for more than three hours. What is the most appropriate modification?
A) Reduce the amount of mandibular protrusion and verify the use of a
morning alignment guide
B) Advance the device further forward to aggressively stretch the pterygoid muscles
C) Increase the vertical dimension of the appliance by 4mm immediately
D) Instruct the patient to wear the appliance only every other night
Rationale: Sharp, long-lasting morning TMJ pain indicates excessive strain on the
retrodiscal tissues or masticatory muscles. Backing down the protrusion reduces this
mechanical stress while maintaining a safer level of airway support.
Question 8: Which screening questionnaire is specifically designed to assess a
patient's subjective daytime sleepiness across eight distinct daily scenarios?
A) STOP-BANG Questionnaire
B) Epworth Sleepiness Scale (ESS)
C) Berlin Questionnaire
D) Pittsburgh Sleep Quality Index (PSQI)
Rationale: The Epworth Sleepiness Scale scores a patient's self-reported likelihood
of nodding off or falling asleep during routine daytime activities like sitting and
reading or watching television.
Question 9: What type of sleep apnea is characterized by a temporary cessation of
airflow accompanied by a complete absence of respiratory effort from the diaphragm
and chest wall?
A) Obstructive Sleep Apnea
B) Central Sleep Apnea
C) Positional Sleep Apnea
D) Upper Airway Resistance Syndrome
Rationale: Central sleep apnea occurs due to a transient loss of ventilatory drive
from the central nervous system, meaning the brain temporarily stops sending the
signal to the respiratory muscles to take a breath.
Question 10: When billing for a custom fabricated oral appliance under medical
insurance guidelines, which Healthcare Common Procedure Coding System
(HCPCS) code must be utilized?
A) D9944
B) E0601
C) E0486
D) CPT 95810
Rationale: Code E0486 is the specific durable medical equipment (DME) code
designated for a custom-fabricated mandibular advancement device that is cleared
by the FDA for the treatment of obstructive sleep apnea.
3|Page
, Question 11: Which structural component of normal sleep architecture is primarily
characterized by the presence of K-complexes and sleep spindles on an EEG?
A) Stage N1
B) Stage N2
C) Stage N3
D) REM sleep
Rationale: Stage N2 light sleep takes up the largest percentage of total sleep time
and is defined electroencephalographically by sleep spindles and K-complexes,
which help shield the brain from outside noises.
Question 12: A patient presents with a history of severe bruxism and has destroyed
multiple acrylic nightguards. Which material choice is most appropriate when
constructing their mandibular advancement device?
A) Thermoplastic lining with a soft vinyl outer shell
B) Milled PMMA or 3D-printed medical-grade polymer with heavy-duty metal
linkages
C) Light-cured composite resin matrix without dual-lamination
D) Standard soft EVA athletic mouthguard material
Rationale: Patients with heavy bruxism exert intense lateral and vertical forces
during sleep. Milled PMMA or high-durability printed resins provide the necessary
structural strength to prevent fracturing the appliance.
Question 13: What constitutes the minimum number of healthy, structurally sound
teeth required in each arch to successfully support a standard custom mandibular
advancement device?
A) 4 maxillary and 4 mandibular teeth
B) 6 maxillary and 6 mandibular teeth
C) 10 maxillary and 10 mandibular teeth
D) A full complement of 14 teeth per arch without exception
Rationale: General consensus guidelines in dental sleep medicine dictate that a
patient needs at least 10 structurally sound teeth per arch to distribute the reciprocal
forces safely and avoid severe tooth movement.
Question 14: Which index calculated during a sleep study includes the total number
of apneas, hypopneas, and respiratory effort-related arousals (RERAs) per hour of
sleep?
A) Apnea Index (AI)
B) Oxygen Desaturation Index (ODI)
C) Respiratory Disturbance Index (RDI)
D) Hypopnea Index (HI)
Rationale: The RDI is a more comprehensive metric than the AHI because it
incorporates RERAs—subtle airway limitations that do not meet full hypopnea
criteria but still trigger micro-arousals.
Question 15: During a clinical exam, you note that a patient's mandible deviates
severely to the left upon wide opening, and they exhibit a maximum lateral excursion
of only 4mm to the right. What does this suggest?
A) Hypermobility of the left condyle
B) An internal derangement or restriction within the left temporomandibular
joint
C) Bilateral hypertrophy of the lateral pterygoid muscles
D) Normal structural variation with no clinical relevance to oral appliance titration
4|Page
Board Practice Questions And Well
Graded Solutions With Rationales
Updated 2026 2027
Pass your ABDSM Final Exam with this definitive study guide containing 300
board-style multiple-choice questions. Covers all high-yield blueprints: upper
airway anatomy, polysomnography (PSG/HSAT) interpretation, oral appliance
therapy (OAT) titration, titration mechanics, managing side effects, and
medical billing codes. Each question includes verified correct answers and
detailed rationales. Perfect for both Traditional and Mastery Track candidates
aiming for Diplomate status.
Question 1: Which of the following landmarks is most critical when evaluating a
patient’s airway during an initial clinical sleep screening?
A) The position of the hyoid bone relative to the clavicle
B) The length of the mandibular condyle
C) The Mallampati classification score
D) The width of the attached gingiva on mandibular molars
Rationale: The Mallampati score provides a direct visual assessment of the space
between the tongue and the soft palate, helping clinicians gauge potential upper
airway crowding and risk for collapse.
1|Page
,Question 2: What is the primary mechanism of action by which a custom mandibular
advancement device successfully treats obstructive sleep apnea?
A) Rigidly locking the temporomandibular joint to prevent mouth opening
B) Forward advancement of the mandible to pull the tongue and epiglottis
away from the posterior pharyngeal wall
C) Direct mechanical suppression of the uvula and soft palate tissues
D) Increasing lateral expansion of the hard palate through skeletal forces
Rationale: Advancing the mandible anteriorly stretches the palatoglossus and
genioglossus muscles, widening the velopharyngeal and oropharyngeal airway
spaces to keep the airway patent during sleep.
Question 3: A patient exhibits severe periodontal bone loss around the mandibular
incisors. How does this finding impact the planning for oral appliance therapy?
A) It serves as a relative contraindication, requiring periodontal stabilization
and potential appliance modifications to redistribute forces
B) It is an absolute contraindication, requiring the patient to use CPAP therapy
exclusively
C) It has no impact on therapy because appliances only exert force on posterior
teeth
D) It requires immediate referral for a full-mouth dental extraction protocol
Rationale: Mandibular advancement appliances place reciprocal posterior-directed
forces on the anterior teeth. Compromised periodontal support requires structural
stabilization and force redistribution across healthier teeth before or during device
wear.
Question 4: Which parameter on a polysomnography report specifically measures
the average number of pauses in breathing per hour that last at least 10 seconds
and are accompanied by an oxygen desaturation of 3% or more?
A) Respiratory Disturbance Index (RDI)
B) Apnea-Hypopnea Index (AHI)
C) Oxygen Desaturation Index (ODI)
D) Total Sleep Time (TST)
Rationale: The AHI is the universally accepted standard metric that tallies the
combined total of apneas (complete airflow cessation) and hypopneas (partial airflow
reduction) per hour of sleep.
Question 5: During a 1-month titration follow-up, a patient reports persistent daytime
sleepiness despite wearing the appliance for 7 hours nightly. The bed partner notes
that snoring has completely stopped. What should be the clinician's next logical
step?
A) Instruct the patient to immediately advance the appliance another 3mm
B) Inform the patient that oral appliance therapy has failed and discontinue treatment
C) Order an objective efficacy sleep study with the appliance in place to verify
actual AHI reduction
D) Assume the sleepiness is entirely unrelated to sleep apnea and refer to a
neurologist
Rationale: The resolution of snoring does not always guarantee that silent
obstructive hypopneas or micro-arousals have been eliminated. An objective sleep
study (HSAT or PSG) is required to evaluate actual therapeutic efficacy.
Question 6: Which medical condition is most frequently associated with untreated,
chronic obstructive sleep apnea due to constant sympathetic nervous system surges
2|Page
,during sleep?
A) Osteoarthritis
B) Chronic obstructive pulmonary disease
C) Drug-resistant systemic hypertension
D) Type 1 diabetes mellitus
Rationale: Frequent nighttime arousals and hypoxic episodes trigger repetitive
surges in adrenaline and cortisol, heavily contributing to persistent elevated blood
pressure that resists standard drug therapies.
Question 7: A patient experiences severe, sharp bilateral pain in the preauricular
region every morning upon removing their mandibular advancement device. The
pain lingers for more than three hours. What is the most appropriate modification?
A) Reduce the amount of mandibular protrusion and verify the use of a
morning alignment guide
B) Advance the device further forward to aggressively stretch the pterygoid muscles
C) Increase the vertical dimension of the appliance by 4mm immediately
D) Instruct the patient to wear the appliance only every other night
Rationale: Sharp, long-lasting morning TMJ pain indicates excessive strain on the
retrodiscal tissues or masticatory muscles. Backing down the protrusion reduces this
mechanical stress while maintaining a safer level of airway support.
Question 8: Which screening questionnaire is specifically designed to assess a
patient's subjective daytime sleepiness across eight distinct daily scenarios?
A) STOP-BANG Questionnaire
B) Epworth Sleepiness Scale (ESS)
C) Berlin Questionnaire
D) Pittsburgh Sleep Quality Index (PSQI)
Rationale: The Epworth Sleepiness Scale scores a patient's self-reported likelihood
of nodding off or falling asleep during routine daytime activities like sitting and
reading or watching television.
Question 9: What type of sleep apnea is characterized by a temporary cessation of
airflow accompanied by a complete absence of respiratory effort from the diaphragm
and chest wall?
A) Obstructive Sleep Apnea
B) Central Sleep Apnea
C) Positional Sleep Apnea
D) Upper Airway Resistance Syndrome
Rationale: Central sleep apnea occurs due to a transient loss of ventilatory drive
from the central nervous system, meaning the brain temporarily stops sending the
signal to the respiratory muscles to take a breath.
Question 10: When billing for a custom fabricated oral appliance under medical
insurance guidelines, which Healthcare Common Procedure Coding System
(HCPCS) code must be utilized?
A) D9944
B) E0601
C) E0486
D) CPT 95810
Rationale: Code E0486 is the specific durable medical equipment (DME) code
designated for a custom-fabricated mandibular advancement device that is cleared
by the FDA for the treatment of obstructive sleep apnea.
3|Page
, Question 11: Which structural component of normal sleep architecture is primarily
characterized by the presence of K-complexes and sleep spindles on an EEG?
A) Stage N1
B) Stage N2
C) Stage N3
D) REM sleep
Rationale: Stage N2 light sleep takes up the largest percentage of total sleep time
and is defined electroencephalographically by sleep spindles and K-complexes,
which help shield the brain from outside noises.
Question 12: A patient presents with a history of severe bruxism and has destroyed
multiple acrylic nightguards. Which material choice is most appropriate when
constructing their mandibular advancement device?
A) Thermoplastic lining with a soft vinyl outer shell
B) Milled PMMA or 3D-printed medical-grade polymer with heavy-duty metal
linkages
C) Light-cured composite resin matrix without dual-lamination
D) Standard soft EVA athletic mouthguard material
Rationale: Patients with heavy bruxism exert intense lateral and vertical forces
during sleep. Milled PMMA or high-durability printed resins provide the necessary
structural strength to prevent fracturing the appliance.
Question 13: What constitutes the minimum number of healthy, structurally sound
teeth required in each arch to successfully support a standard custom mandibular
advancement device?
A) 4 maxillary and 4 mandibular teeth
B) 6 maxillary and 6 mandibular teeth
C) 10 maxillary and 10 mandibular teeth
D) A full complement of 14 teeth per arch without exception
Rationale: General consensus guidelines in dental sleep medicine dictate that a
patient needs at least 10 structurally sound teeth per arch to distribute the reciprocal
forces safely and avoid severe tooth movement.
Question 14: Which index calculated during a sleep study includes the total number
of apneas, hypopneas, and respiratory effort-related arousals (RERAs) per hour of
sleep?
A) Apnea Index (AI)
B) Oxygen Desaturation Index (ODI)
C) Respiratory Disturbance Index (RDI)
D) Hypopnea Index (HI)
Rationale: The RDI is a more comprehensive metric than the AHI because it
incorporates RERAs—subtle airway limitations that do not meet full hypopnea
criteria but still trigger micro-arousals.
Question 15: During a clinical exam, you note that a patient's mandible deviates
severely to the left upon wide opening, and they exhibit a maximum lateral excursion
of only 4mm to the right. What does this suggest?
A) Hypermobility of the left condyle
B) An internal derangement or restriction within the left temporomandibular
joint
C) Bilateral hypertrophy of the lateral pterygoid muscles
D) Normal structural variation with no clinical relevance to oral appliance titration
4|Page
