ADEX CSCE OSCE EXAM 200 ACTUAL QUESTIONS AND
CORRECT ANSWERS LATEST 2026 ALREADY GRADED A+
This comprehensive 200-question bank for the ADEX CSCE OSCE exam
covers the full spectrum of clinical dentistry, including diagnosis, treatment
planning, pharmacology, radiology, periodontics, endodontics, prosthodontics,
oral surgery, pediatric dentistry, and emergency medicine. Each multiple-
choice question presents a realistic clinical scenario, followed by four plausible
options. A correct answer is provided alongside a detailed, evidence-based
rationale that explains the underlying pathophysiology, clinical reasoning, or
treatment protocol. The questions test higher-order thinking, including
patient management, complication recognition, radiographic interpretation,
and systemic disease interactions. No two questions repeat any diagnosis,
drug, anatomical structure, radiographic finding, treatment principle, or
clinical scenario, ensuring comprehensive content coverage.
1. A 52-year-old patient with type 2 diabetes (HbA1c 8.2%) has probing depths of
5–7 mm, clinical attachment loss of 4–5 mm, and radiographic bone loss of 30–
50% on six teeth. Three teeth have been lost due to periodontitis. What is the most
appropriate AAP/ADA periodontitis diagnosis?
A) Stage II, Grade B
B) Stage III, Grade C
C) Stage IV, Grade C
D) Stage III, Grade B
Answer: B
Rationale: Stage III is defined by CAL ≥5 mm, bone loss extending to middle third
of root, and possibility of tooth loss (≤4 teeth). Grade C indicates rapid
progression, associated with HbA1c >7% (uncontrolled diabetes). Stage IV would
involve more extensive tooth loss or masticatory dysfunction.
2. During a crown preparation, the patient asks, "Will this treatment definitely
work for 20 years?" The most appropriate ethical response is:
A) "Yes, with modern materials, crowns last a lifetime."
B) "No dental procedure can be guaranteed, but crowns have a high success rate if
you maintain good oral hygiene."
C) "I guarantee 20 years if you sign this waiver."
,D) "Let's discuss that after the procedure is done."
Answer: B
Rationale: Informed consent requires truthfulness and avoiding unrealistic
guarantees. Option B provides realistic expectations while acknowledging
individual variability. Guarantees (A, C) are unethical and legally problematic.
Delaying (D) violates patient autonomy.
3. A patient on rivaroxaban 20 mg daily needs a simple extraction of a mobile
tooth. According to current guidelines, what is the recommended management?
A) Stop rivaroxaban 48 hours before extraction.
B) Continue rivaroxaban; use local hemostatic measures.
C) Bridge with enoxaparin.
D) Check INR; if >1.5, postpone.
Answer: B
Rationale: Direct oral anticoagulants (DOACs) like rivaroxaban do not require
interruption for simple extractions when used at standard doses. Local measures
(gauze, tranexamic acid, sutures) are sufficient. INR is not relevant for DOACs.
Bridging increases bleeding risk without benefit.
4. Which bur is specifically designed to create a reverse curve for a dovetail in a
Class II amalgam preparation?
A) 330
B) 245
C) 557
D) 701
Answer: A
Rationale: The #330 bur, with its conical shape and rounded end, is ideal for
creating the occlusal dovetail and reverse S-curve in a traditional Class II amalgam
preparation. #245 is for proximal box divergence; #557 is a straight fissure bur;
#701 is for slot preparations.
5. A patient reports severe, lingering pain to cold that lasts over 60 seconds after
the stimulus is removed. The tooth has a deep carious lesion. What is the most
likely diagnosis?
A) Normal pulp
B) Reversible pulpitis
C) Irreversible pulpitis
D) Pulp necrosis
Answer: C
,Rationale: Irreversible pulpitis is characterized by lingering pain (typically >10–30
seconds) after stimulus removal. Reversible pulpitis pain ceases immediately.
Normal pulp has mild/no pain. Necrosis gives no response.
6. A patient has multiple non-carious cervical lesions (NCCLs) with minimal
dentin exposure and high esthetic demand. Which material offers the best
combination of adhesion, fluoride release, and esthetics?
A) Amalgam
B) Resin-modified glass ionomer (RMGI)
C) Conventional glass ionomer
D) Composite resin without adhesive
Answer: B
Rationale: RMGI bonds chemically to tooth structure, releases fluoride, has
acceptable esthetics, and requires minimal preparation. Conventional GI has poorer
esthetics and wear resistance. Composite requires etching and bonding but lacks
fluoride release. Amalgam is unaesthetic.
7. A 35-year-old has a 1.5 cm well-defined unilocular radiolucency at the apex of
#19. The tooth tests vital. The patient is asymptomatic. Most likely diagnosis:
A) Periapical granuloma
B) Radicular cyst
C) Periapical cemento-osseous dysplasia (PCOD)
D) Traumatic bone cyst
Answer: C
Rationale: PCOD is a benign fibro-osseous lesion that typically occurs in the
anterior mandible of middle-aged women, with vital teeth. Periapical
granuloma/cyst (A/B) would involve non-vital teeth. Traumatic bone cyst (D) is
not typically periapical.
8. During local anesthetic administration, the patient becomes pale, diaphoretic,
and reports nausea. BP 80/50, pulse 50 bpm and weak. Immediate first action:
A) Administer epinephrine 0.3 mg IM.
B) Place patient supine with legs elevated (Trendelenburg).
C) Administer oxygen 15 L/min via non-rebreather.
D) Check blood glucose.
Answer: B
Rationale: These are classic signs of vasovagal syncope (bradycardia,
hypotension). The priority is to increase cerebral perfusion by lowering the head.
Epinephrine is for anaphylaxis. Oxygen is secondary. Glucose check is not first
step unless diabetic suspected.
, 9. During root canal treatment, the electronic apex locator reads "0.5" on tooth #8.
The radiograph shows the file is 2 mm short of the radiographic apex. What should
you do?
A) Accept the radiograph as correct.
B) Trust the apex locator and prepare to that length.
C) Subtract 1 mm from the apex locator reading.
D) Remeasure with a different apex locator.
Answer: B
Rationale: Modern electronic apex locators are more accurate than radiographs
(accuracy >90% within 0.5 mm of the apical foramen). Radiographic apex may not
coincide with the apical foramen. The working length should be at the apical
constriction (0.5–1.0 mm short of the foramen).
10. A 3-year-old has moderate early childhood caries. The parent asks about
fluoride varnish. What is the recommended frequency?
A) Once at the initial visit only.
B) Every 3–6 months.
C) Every 12 months.
D) Only if water is non-fluoridated.
Answer: B
Rationale: AAPD guidelines recommend fluoride varnish application every 3–6
months for children at high caries risk, regardless of water fluoridation. It
remineralizes enamel and arrests early lesions.
11. Which of the following is not considered a critical instrument requiring
sterilization?
A) Periodontal scaler
B) High-speed handpiece
C) X-ray film holder
D) Surgical forceps
Answer: C
Rationale: Critical instruments penetrate soft tissue or bone and must be sterilized.
X-ray film holders are semicritical (contact mucous membranes) and require high-
level disinfection or sterilization. Scalers, handpieces, and forceps are always
critical.
12. On a panoramic radiograph, a radiopaque line extending below the mandibular
canal in the premolar region most likely represents:
A) Mylohyoid ridge
CORRECT ANSWERS LATEST 2026 ALREADY GRADED A+
This comprehensive 200-question bank for the ADEX CSCE OSCE exam
covers the full spectrum of clinical dentistry, including diagnosis, treatment
planning, pharmacology, radiology, periodontics, endodontics, prosthodontics,
oral surgery, pediatric dentistry, and emergency medicine. Each multiple-
choice question presents a realistic clinical scenario, followed by four plausible
options. A correct answer is provided alongside a detailed, evidence-based
rationale that explains the underlying pathophysiology, clinical reasoning, or
treatment protocol. The questions test higher-order thinking, including
patient management, complication recognition, radiographic interpretation,
and systemic disease interactions. No two questions repeat any diagnosis,
drug, anatomical structure, radiographic finding, treatment principle, or
clinical scenario, ensuring comprehensive content coverage.
1. A 52-year-old patient with type 2 diabetes (HbA1c 8.2%) has probing depths of
5–7 mm, clinical attachment loss of 4–5 mm, and radiographic bone loss of 30–
50% on six teeth. Three teeth have been lost due to periodontitis. What is the most
appropriate AAP/ADA periodontitis diagnosis?
A) Stage II, Grade B
B) Stage III, Grade C
C) Stage IV, Grade C
D) Stage III, Grade B
Answer: B
Rationale: Stage III is defined by CAL ≥5 mm, bone loss extending to middle third
of root, and possibility of tooth loss (≤4 teeth). Grade C indicates rapid
progression, associated with HbA1c >7% (uncontrolled diabetes). Stage IV would
involve more extensive tooth loss or masticatory dysfunction.
2. During a crown preparation, the patient asks, "Will this treatment definitely
work for 20 years?" The most appropriate ethical response is:
A) "Yes, with modern materials, crowns last a lifetime."
B) "No dental procedure can be guaranteed, but crowns have a high success rate if
you maintain good oral hygiene."
C) "I guarantee 20 years if you sign this waiver."
,D) "Let's discuss that after the procedure is done."
Answer: B
Rationale: Informed consent requires truthfulness and avoiding unrealistic
guarantees. Option B provides realistic expectations while acknowledging
individual variability. Guarantees (A, C) are unethical and legally problematic.
Delaying (D) violates patient autonomy.
3. A patient on rivaroxaban 20 mg daily needs a simple extraction of a mobile
tooth. According to current guidelines, what is the recommended management?
A) Stop rivaroxaban 48 hours before extraction.
B) Continue rivaroxaban; use local hemostatic measures.
C) Bridge with enoxaparin.
D) Check INR; if >1.5, postpone.
Answer: B
Rationale: Direct oral anticoagulants (DOACs) like rivaroxaban do not require
interruption for simple extractions when used at standard doses. Local measures
(gauze, tranexamic acid, sutures) are sufficient. INR is not relevant for DOACs.
Bridging increases bleeding risk without benefit.
4. Which bur is specifically designed to create a reverse curve for a dovetail in a
Class II amalgam preparation?
A) 330
B) 245
C) 557
D) 701
Answer: A
Rationale: The #330 bur, with its conical shape and rounded end, is ideal for
creating the occlusal dovetail and reverse S-curve in a traditional Class II amalgam
preparation. #245 is for proximal box divergence; #557 is a straight fissure bur;
#701 is for slot preparations.
5. A patient reports severe, lingering pain to cold that lasts over 60 seconds after
the stimulus is removed. The tooth has a deep carious lesion. What is the most
likely diagnosis?
A) Normal pulp
B) Reversible pulpitis
C) Irreversible pulpitis
D) Pulp necrosis
Answer: C
,Rationale: Irreversible pulpitis is characterized by lingering pain (typically >10–30
seconds) after stimulus removal. Reversible pulpitis pain ceases immediately.
Normal pulp has mild/no pain. Necrosis gives no response.
6. A patient has multiple non-carious cervical lesions (NCCLs) with minimal
dentin exposure and high esthetic demand. Which material offers the best
combination of adhesion, fluoride release, and esthetics?
A) Amalgam
B) Resin-modified glass ionomer (RMGI)
C) Conventional glass ionomer
D) Composite resin without adhesive
Answer: B
Rationale: RMGI bonds chemically to tooth structure, releases fluoride, has
acceptable esthetics, and requires minimal preparation. Conventional GI has poorer
esthetics and wear resistance. Composite requires etching and bonding but lacks
fluoride release. Amalgam is unaesthetic.
7. A 35-year-old has a 1.5 cm well-defined unilocular radiolucency at the apex of
#19. The tooth tests vital. The patient is asymptomatic. Most likely diagnosis:
A) Periapical granuloma
B) Radicular cyst
C) Periapical cemento-osseous dysplasia (PCOD)
D) Traumatic bone cyst
Answer: C
Rationale: PCOD is a benign fibro-osseous lesion that typically occurs in the
anterior mandible of middle-aged women, with vital teeth. Periapical
granuloma/cyst (A/B) would involve non-vital teeth. Traumatic bone cyst (D) is
not typically periapical.
8. During local anesthetic administration, the patient becomes pale, diaphoretic,
and reports nausea. BP 80/50, pulse 50 bpm and weak. Immediate first action:
A) Administer epinephrine 0.3 mg IM.
B) Place patient supine with legs elevated (Trendelenburg).
C) Administer oxygen 15 L/min via non-rebreather.
D) Check blood glucose.
Answer: B
Rationale: These are classic signs of vasovagal syncope (bradycardia,
hypotension). The priority is to increase cerebral perfusion by lowering the head.
Epinephrine is for anaphylaxis. Oxygen is secondary. Glucose check is not first
step unless diabetic suspected.
, 9. During root canal treatment, the electronic apex locator reads "0.5" on tooth #8.
The radiograph shows the file is 2 mm short of the radiographic apex. What should
you do?
A) Accept the radiograph as correct.
B) Trust the apex locator and prepare to that length.
C) Subtract 1 mm from the apex locator reading.
D) Remeasure with a different apex locator.
Answer: B
Rationale: Modern electronic apex locators are more accurate than radiographs
(accuracy >90% within 0.5 mm of the apical foramen). Radiographic apex may not
coincide with the apical foramen. The working length should be at the apical
constriction (0.5–1.0 mm short of the foramen).
10. A 3-year-old has moderate early childhood caries. The parent asks about
fluoride varnish. What is the recommended frequency?
A) Once at the initial visit only.
B) Every 3–6 months.
C) Every 12 months.
D) Only if water is non-fluoridated.
Answer: B
Rationale: AAPD guidelines recommend fluoride varnish application every 3–6
months for children at high caries risk, regardless of water fluoridation. It
remineralizes enamel and arrests early lesions.
11. Which of the following is not considered a critical instrument requiring
sterilization?
A) Periodontal scaler
B) High-speed handpiece
C) X-ray film holder
D) Surgical forceps
Answer: C
Rationale: Critical instruments penetrate soft tissue or bone and must be sterilized.
X-ray film holders are semicritical (contact mucous membranes) and require high-
level disinfection or sterilization. Scalers, handpieces, and forceps are always
critical.
12. On a panoramic radiograph, a radiopaque line extending below the mandibular
canal in the premolar region most likely represents:
A) Mylohyoid ridge
