ABDSM FINAL EXAM TEST 2025/2026 LATEST UPDATE COMPREHENSIVE
QUESTIONS AND VERIFIED DETAILED ANSWERS [MOST TESTED QUESTIONS]
CERTIFIED STUDY GUIDE RESOURCES GRADED A+
Question 1
Which of the following statements is true regarding the modified Mallampati classification of the
oropharynx during an OSA screening?
A) Mallampati II allows visualization of only the hard palate.
B) Mallampati III allows visualization of only the hard palate.
C) Mallampati classifications must be taken with the patient sedated and reclined to be accurate.
D) Mallampati Class IV has a significantly greater odds ratio for severe OSA compared to
Mallampati Class I.
E) Mallampati I indicates that the soft palate and uvula are completely obscured.
Correct Answer: D) Mallampati Class IV has a significantly greater odds ratio for severe
OSA compared to Mallampati Class I.
Rationale: The modified Mallampati score is a visual tool used to predict the ease of
intubation and the risk of Obstructive Sleep Apnea (OSA). A Class IV classification—where
only the hard palate is visible and the soft palate is entirely obscured—is strongly
correlated with a high Apnea-Hypopnea Index (AHI). Research indicates that for every
one-point increase in Mallampati score, the odds of having OSA increase by more than
twofold. Class II allows for visualization of the uvula, while Class III only allows the base of
the uvula and the soft palate to be seen.
Question 2
Which 8-item questionnaire was specifically developed and validated to screen for the risk of
OSA in the perioperative and general clinical setting?
A) Epworth Sleepiness Scale (ESS)
B) STOP-BANG Questionnaire
C) Multiple Sleep Latency Test (MSLT)
D) Berlin Questionnaire
E) Stanford Sleepiness Scale
Correct Answer: B) STOP-BANG
Rationale: The STOP-BANG questionnaire consists of four subjective items (Snoring,
Tiredness, Observed apnea, and high blood Pressure) and four objective items (BMI, Age,
Neck circumference, and Gender). It is highly sensitive, particularly for identifying
moderate-to-severe OSA. The ESS (Option A) measures subjective daytime sleepiness but
does not screen for the presence of apnea itself. The MSLT (Option C) is a diagnostic test
for narcolepsy and idiopathic hypersomnia, not a screening questionnaire.
Question 3
In the pathophysiology of Obstructive Sleep Apnea, which of the following factors promotes
airway patency and increases pharyngeal stability?
A) Increased lung volume (Increased FRC)
, 2
B) A shorter, retrognathic mandible
C) Increased parapharyngeal fat deposition
D) High negative inspiratory pressure
E) Reduced pharyngeal muscle dilator activity
Correct Answer: A) Increased lung volume
Rationale: Increased lung volume (Functional Residual Capacity) promotes airway patency
through "caudal traction." As lung volume increases, the trachea is pulled downward,
which increases the longitudinal tension on the pharyngeal walls, making them less likely to
collapse. Conversely, obesity (fat deposition), micrognathia (short mandible), and reduced
muscle tone all decrease the size of the airway or increase its collapsibility.
Question 4
Oral appliance therapy (OAT) is generally NOT considered successful sole therapy for which of
the following complex sleep-related breathing disorders?
A) Primary central sleep apnea
B) Cheyne-Stokes periodic breathing
C) Obesity hypoventilation syndrome
D) Overlap syndrome (OSA combined with COPD)
E) All of the above
Correct Answer: E) All of the above
Rationale: Oral appliances primarily function by physically advancing the mandible to
increase the volume of the upper airway. They are highly effective for Obstructive Sleep
Apnea (OSA). However, they do not address the neurological drive-to-breathe issues found
in Central Sleep Apnea or Cheyne-Stokes breathing. They are also insufficient for
managing the gas exchange deficits (hypercapnia) found in obesity hypoventilation or the
severe lung disease component of Overlap Syndrome.
Question 5
Which of the following is true regarding the relationship between OSA and Hypertension
(HTN)?
A) Ambulatory blood pressure increases in OSA primarily due to salt intake from ghrelin spikes.
B) Blood pressure normally increases in the early morning; this increase is blunted in OSA
patients.
C) The risk of HTN is constant across all severity levels of OSA, including mild cases.
D) The risk of HTN in untreated OSA is driven by intermittent hypoxia, sympathetic over-
activation, and systemic inflammation.
E) Only systolic blood pressure is affected by sleep-disordered breathing.
Correct Answer: D) The risk of HTN in untreated OSA is driven by intermittent hypoxia,
sympathetic over-activation, and systemic inflammation.
Rationale: OSA and HTN are closely linked. Every episode of apnea leads to a surge in the
, 3
sympathetic nervous system as the body fights to wake up and breathe. This leads to
increased levels of catecholamines (epinephrine/norepinephrine), systemic inflammation,
and oxidative stress, which together contribute to sustained hypertension. Furthermore,
OSA patients often lack the normal "nocturnal dipping" of blood pressure, categorized as
"non-dippers," which increases cardiovascular risk.
Question 6
Within the general population, which of the following is statistically the most common sleep
disorder?
A) Restless Leg Syndrome (RLS)
B) Narcolepsy
C) Delayed Sleep Phase Syndrome
D) Insomnia
E) Obstructive Sleep Apnea (OSA)
Correct Answer: D) Insomnia
Rationale: While OSA is highly prevalent, Insomnia remains the most common sleep
disorder, affecting approximately 30-35% of the general population to some degree. OSA
follows as the second most common. Narcolepsy and circadian rhythm disorders like
Delayed Sleep Phase are significantly rarer.
Question 7
Measurements have shown that OSA patients have smaller upper airways than healthy
individuals, yet they manage to maintain an open airway during wakefulness. How is this
achieved?
A) Switching exclusively to mouth breathing.
B) Increased pharyngeal dilator muscle tone during inspiration.
C) Increased blood flow to the soft tissues to stiffen the airway.
D) Frequent bruxing to stabilize the jaw.
E) Maintaining a constant state of hyperventilation.
Correct Answer: B) Increased pharyngeal dilator muscle tone during inspiration.
Rationale: During wakefulness, the body utilizes a compensatory reflex where the
genioglossus and other pharyngeal dilator muscles increase their activity to keep the
"small" airway open. When the patient falls asleep, this neurological compensatory drive is
lost, muscle tone decreases, and the small airway collapses under the negative pressure of
inspiration.
Question 8
Which of the following is a key diagnostic feature of OSA recorded during an in-lab
polysomnogram (PSG)?
A) Increased heart rate during the apnea event
B) Oxygen desaturation (SpO2 drop)
, 4
C) A spike in the nasal pressure signal
D) Significant flailing of the limbs during Stage 2 sleep
E) Continuous alpha wave activity throughout the night
Correct Answer: B) Oxygen desaturation
Rationale: An obstructive apnea event is defined by the cessation of airflow for at least 10
seconds despite continued respiratory effort. This lack of airflow leads to a drop in blood
oxygen levels (desaturation) and usually ends in an arousal from sleep. Heart rate typically
slows (bradycardia) during the apnea and speeds up (tachycardia) upon arousal.
Question 9
In the administrative side of dental sleep medicine, which organization is responsible for
publishing and maintaining the CPT (Current Procedural Terminology) codebook?
A) The Centers for Medicare and Medicaid Services (CMS)
B) The American Medical Association (AMA)
C) The Office of the Inspector General (OIG)
D) The Durable Medical Equipment (DME) Service
E) The American Academy of Sleep Medicine (AASM)
Correct Answer: B) The American Medical Association (AMA)
Rationale: The AMA owns and maintains the CPT code system, which is used by healthcare
providers to report medical procedures and services. While dentists use CDT codes for
general dentistry, they must use CPT codes (e.g., E0486 for OAT) when billing medical
insurance for sleep apnea treatment.
Question 10
A 48-year-old male is treated with an oral appliance for moderate OSA. A repeat sleep test shows
his AHI has dropped to 3 events per hour, and his symptoms have resolved. What is the standard
recommended dental-medical follow-up for this patient?
A) Follow up on an "as needed" basis only.
B) Every 6 months for the first year, then annually.
C) Monthly for the first year, then every 6 months.
D) Every two years to check for device wear.
E) No follow-up is needed if the patient reports feeling well.
Correct Answer: B) Every 6 months for the first year, then annually.
Rationale: Clinical guidelines for dental sleep medicine emphasize the need for long-term
management. Regular follow-up is necessary to monitor for dental side effects (bite
changes, tooth movement), assess the structural integrity of the appliance, and ensure the
patient remains asymptomatic and compliant with therapy.
Question 11
Which of the following clinical findings would generally exclude Oral Appliance Therapy as a
primary treatment option for a patient with OSA?
QUESTIONS AND VERIFIED DETAILED ANSWERS [MOST TESTED QUESTIONS]
CERTIFIED STUDY GUIDE RESOURCES GRADED A+
Question 1
Which of the following statements is true regarding the modified Mallampati classification of the
oropharynx during an OSA screening?
A) Mallampati II allows visualization of only the hard palate.
B) Mallampati III allows visualization of only the hard palate.
C) Mallampati classifications must be taken with the patient sedated and reclined to be accurate.
D) Mallampati Class IV has a significantly greater odds ratio for severe OSA compared to
Mallampati Class I.
E) Mallampati I indicates that the soft palate and uvula are completely obscured.
Correct Answer: D) Mallampati Class IV has a significantly greater odds ratio for severe
OSA compared to Mallampati Class I.
Rationale: The modified Mallampati score is a visual tool used to predict the ease of
intubation and the risk of Obstructive Sleep Apnea (OSA). A Class IV classification—where
only the hard palate is visible and the soft palate is entirely obscured—is strongly
correlated with a high Apnea-Hypopnea Index (AHI). Research indicates that for every
one-point increase in Mallampati score, the odds of having OSA increase by more than
twofold. Class II allows for visualization of the uvula, while Class III only allows the base of
the uvula and the soft palate to be seen.
Question 2
Which 8-item questionnaire was specifically developed and validated to screen for the risk of
OSA in the perioperative and general clinical setting?
A) Epworth Sleepiness Scale (ESS)
B) STOP-BANG Questionnaire
C) Multiple Sleep Latency Test (MSLT)
D) Berlin Questionnaire
E) Stanford Sleepiness Scale
Correct Answer: B) STOP-BANG
Rationale: The STOP-BANG questionnaire consists of four subjective items (Snoring,
Tiredness, Observed apnea, and high blood Pressure) and four objective items (BMI, Age,
Neck circumference, and Gender). It is highly sensitive, particularly for identifying
moderate-to-severe OSA. The ESS (Option A) measures subjective daytime sleepiness but
does not screen for the presence of apnea itself. The MSLT (Option C) is a diagnostic test
for narcolepsy and idiopathic hypersomnia, not a screening questionnaire.
Question 3
In the pathophysiology of Obstructive Sleep Apnea, which of the following factors promotes
airway patency and increases pharyngeal stability?
A) Increased lung volume (Increased FRC)
, 2
B) A shorter, retrognathic mandible
C) Increased parapharyngeal fat deposition
D) High negative inspiratory pressure
E) Reduced pharyngeal muscle dilator activity
Correct Answer: A) Increased lung volume
Rationale: Increased lung volume (Functional Residual Capacity) promotes airway patency
through "caudal traction." As lung volume increases, the trachea is pulled downward,
which increases the longitudinal tension on the pharyngeal walls, making them less likely to
collapse. Conversely, obesity (fat deposition), micrognathia (short mandible), and reduced
muscle tone all decrease the size of the airway or increase its collapsibility.
Question 4
Oral appliance therapy (OAT) is generally NOT considered successful sole therapy for which of
the following complex sleep-related breathing disorders?
A) Primary central sleep apnea
B) Cheyne-Stokes periodic breathing
C) Obesity hypoventilation syndrome
D) Overlap syndrome (OSA combined with COPD)
E) All of the above
Correct Answer: E) All of the above
Rationale: Oral appliances primarily function by physically advancing the mandible to
increase the volume of the upper airway. They are highly effective for Obstructive Sleep
Apnea (OSA). However, they do not address the neurological drive-to-breathe issues found
in Central Sleep Apnea or Cheyne-Stokes breathing. They are also insufficient for
managing the gas exchange deficits (hypercapnia) found in obesity hypoventilation or the
severe lung disease component of Overlap Syndrome.
Question 5
Which of the following is true regarding the relationship between OSA and Hypertension
(HTN)?
A) Ambulatory blood pressure increases in OSA primarily due to salt intake from ghrelin spikes.
B) Blood pressure normally increases in the early morning; this increase is blunted in OSA
patients.
C) The risk of HTN is constant across all severity levels of OSA, including mild cases.
D) The risk of HTN in untreated OSA is driven by intermittent hypoxia, sympathetic over-
activation, and systemic inflammation.
E) Only systolic blood pressure is affected by sleep-disordered breathing.
Correct Answer: D) The risk of HTN in untreated OSA is driven by intermittent hypoxia,
sympathetic over-activation, and systemic inflammation.
Rationale: OSA and HTN are closely linked. Every episode of apnea leads to a surge in the
, 3
sympathetic nervous system as the body fights to wake up and breathe. This leads to
increased levels of catecholamines (epinephrine/norepinephrine), systemic inflammation,
and oxidative stress, which together contribute to sustained hypertension. Furthermore,
OSA patients often lack the normal "nocturnal dipping" of blood pressure, categorized as
"non-dippers," which increases cardiovascular risk.
Question 6
Within the general population, which of the following is statistically the most common sleep
disorder?
A) Restless Leg Syndrome (RLS)
B) Narcolepsy
C) Delayed Sleep Phase Syndrome
D) Insomnia
E) Obstructive Sleep Apnea (OSA)
Correct Answer: D) Insomnia
Rationale: While OSA is highly prevalent, Insomnia remains the most common sleep
disorder, affecting approximately 30-35% of the general population to some degree. OSA
follows as the second most common. Narcolepsy and circadian rhythm disorders like
Delayed Sleep Phase are significantly rarer.
Question 7
Measurements have shown that OSA patients have smaller upper airways than healthy
individuals, yet they manage to maintain an open airway during wakefulness. How is this
achieved?
A) Switching exclusively to mouth breathing.
B) Increased pharyngeal dilator muscle tone during inspiration.
C) Increased blood flow to the soft tissues to stiffen the airway.
D) Frequent bruxing to stabilize the jaw.
E) Maintaining a constant state of hyperventilation.
Correct Answer: B) Increased pharyngeal dilator muscle tone during inspiration.
Rationale: During wakefulness, the body utilizes a compensatory reflex where the
genioglossus and other pharyngeal dilator muscles increase their activity to keep the
"small" airway open. When the patient falls asleep, this neurological compensatory drive is
lost, muscle tone decreases, and the small airway collapses under the negative pressure of
inspiration.
Question 8
Which of the following is a key diagnostic feature of OSA recorded during an in-lab
polysomnogram (PSG)?
A) Increased heart rate during the apnea event
B) Oxygen desaturation (SpO2 drop)
, 4
C) A spike in the nasal pressure signal
D) Significant flailing of the limbs during Stage 2 sleep
E) Continuous alpha wave activity throughout the night
Correct Answer: B) Oxygen desaturation
Rationale: An obstructive apnea event is defined by the cessation of airflow for at least 10
seconds despite continued respiratory effort. This lack of airflow leads to a drop in blood
oxygen levels (desaturation) and usually ends in an arousal from sleep. Heart rate typically
slows (bradycardia) during the apnea and speeds up (tachycardia) upon arousal.
Question 9
In the administrative side of dental sleep medicine, which organization is responsible for
publishing and maintaining the CPT (Current Procedural Terminology) codebook?
A) The Centers for Medicare and Medicaid Services (CMS)
B) The American Medical Association (AMA)
C) The Office of the Inspector General (OIG)
D) The Durable Medical Equipment (DME) Service
E) The American Academy of Sleep Medicine (AASM)
Correct Answer: B) The American Medical Association (AMA)
Rationale: The AMA owns and maintains the CPT code system, which is used by healthcare
providers to report medical procedures and services. While dentists use CDT codes for
general dentistry, they must use CPT codes (e.g., E0486 for OAT) when billing medical
insurance for sleep apnea treatment.
Question 10
A 48-year-old male is treated with an oral appliance for moderate OSA. A repeat sleep test shows
his AHI has dropped to 3 events per hour, and his symptoms have resolved. What is the standard
recommended dental-medical follow-up for this patient?
A) Follow up on an "as needed" basis only.
B) Every 6 months for the first year, then annually.
C) Monthly for the first year, then every 6 months.
D) Every two years to check for device wear.
E) No follow-up is needed if the patient reports feeling well.
Correct Answer: B) Every 6 months for the first year, then annually.
Rationale: Clinical guidelines for dental sleep medicine emphasize the need for long-term
management. Regular follow-up is necessary to monitor for dental side effects (bite
changes, tooth movement), assess the structural integrity of the appliance, and ensure the
patient remains asymptomatic and compliant with therapy.
Question 11
Which of the following clinical findings would generally exclude Oral Appliance Therapy as a
primary treatment option for a patient with OSA?
