CDCA OSCE STUDY GUIDE 2025/2026 VERIFIED
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES || 100% GUARANTEED PASS
<UPDATED VERSION>
CDCA OSCE STUDY GUIDE — 100 MCQs (Answers marked with )
Below are 100 practice multiple-choice questions. Each question has four options (A–D) and the
correct option is marked inside the question. No explanations included as requested.
1. What is the recommended handrub time when using an alcohol-based hand rub?
A. 5 seconds
B. 10 seconds
C. 15 seconds
D. 30 seconds
2. Which gauge needle is most commonly used for inferior alveolar nerve block?
A. 25-gauge
B. 27-gauge
C. 30-gauge
D. 18-gauge
3. For pulpal anesthesia during root canal therapy, which anesthetic is typically fastest in
onset?
A. Bupivacaine
B. Articaine
C. Procaine
D. Tetracaine
4. What is the primary purpose of rubber dam isolation?
A. Improve light
B. Prevent patient swallowing of instruments
C. Provide moisture control and contamination prevention
D. Increase salivation
,5. When taking a periapical radiograph, the bisecting-angle technique aims to:
A. Minimize patient discomfort
B. Align the film parallel to the tooth
C. Bisect the angle between film and tooth to project tooth length accurately
D. Increase radiation dose
6. The most common organism implicated in infective endocarditis from dental origin is:
A. Staphylococcus aureus
B. Streptococcus viridans (mutans group)
C. Pseudomonas aeruginosa
D. Candida albicans
7. During an OSCE history-taking station, the first step is to:
A. Start treatment immediately
B. Introduce yourself and confirm patient identity
C. Take blood pressure
D. Ask about allergies
8. A patient reports allergy to penicillin. Which antibiotic is commonly used for prophylaxis
if needed?
A. Amoxicillin
B. Clindamycin
C. Cephalexin
D. Doxycycline
9. The ASA classification for a healthy patient with no systemic disease is:
A. ASA I
B. ASA II
C. ASA III
D. ASA IV
10. Which local anesthetic has the longest duration of action for pulpal anesthesia?
A. Lidocaine
B. Mepivacaine
C. Bupivacaine
D. Articaine
11. When charting caries into a tooth, the term "pit and fissure caries" best describes lesions
located on:
A. Smooth surfaces
, B. Occlusal surfaces of posterior teeth
C. Interproximal areas
D. Root surfaces
12. The working length determination for endodontic treatment is best estimated by:
A. Visualizing radiographic apex only
B. Electronic apex locator combined with radiograph
C. Measuring crown length only
D. Tactile sensation
13. Which suture material is non-resorbable?
A. Polyglactin 910
B. Catgut
C. Nylon
D. Polyglycolic acid
14. A dry socket (alveolar osteitis) most commonly occurs after:
A. Scaling and root planing
B. Simple crown preparation
C. Mandibular third molar extraction
D. Root canal therapy
15. The minimal interincisal opening considered adequate for most dental procedures is
approximately:
A. 10 mm
B. 20–25 mm
C. 40 mm
D. 60 mm
16. During a basic life support (BLS) adult single-rescuer CPR, the compression-to-ventilation
ratio is:
A. 15:2
B. 30:2
C. 20:2
D. 10:1
17. The appropriate immediate management of a small avulsed tooth (milk tooth) in a child
is:
A. Replant immediately if permanent; for primary do not replant
B. Always replant primary tooth
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES || 100% GUARANTEED PASS
<UPDATED VERSION>
CDCA OSCE STUDY GUIDE — 100 MCQs (Answers marked with )
Below are 100 practice multiple-choice questions. Each question has four options (A–D) and the
correct option is marked inside the question. No explanations included as requested.
1. What is the recommended handrub time when using an alcohol-based hand rub?
A. 5 seconds
B. 10 seconds
C. 15 seconds
D. 30 seconds
2. Which gauge needle is most commonly used for inferior alveolar nerve block?
A. 25-gauge
B. 27-gauge
C. 30-gauge
D. 18-gauge
3. For pulpal anesthesia during root canal therapy, which anesthetic is typically fastest in
onset?
A. Bupivacaine
B. Articaine
C. Procaine
D. Tetracaine
4. What is the primary purpose of rubber dam isolation?
A. Improve light
B. Prevent patient swallowing of instruments
C. Provide moisture control and contamination prevention
D. Increase salivation
,5. When taking a periapical radiograph, the bisecting-angle technique aims to:
A. Minimize patient discomfort
B. Align the film parallel to the tooth
C. Bisect the angle between film and tooth to project tooth length accurately
D. Increase radiation dose
6. The most common organism implicated in infective endocarditis from dental origin is:
A. Staphylococcus aureus
B. Streptococcus viridans (mutans group)
C. Pseudomonas aeruginosa
D. Candida albicans
7. During an OSCE history-taking station, the first step is to:
A. Start treatment immediately
B. Introduce yourself and confirm patient identity
C. Take blood pressure
D. Ask about allergies
8. A patient reports allergy to penicillin. Which antibiotic is commonly used for prophylaxis
if needed?
A. Amoxicillin
B. Clindamycin
C. Cephalexin
D. Doxycycline
9. The ASA classification for a healthy patient with no systemic disease is:
A. ASA I
B. ASA II
C. ASA III
D. ASA IV
10. Which local anesthetic has the longest duration of action for pulpal anesthesia?
A. Lidocaine
B. Mepivacaine
C. Bupivacaine
D. Articaine
11. When charting caries into a tooth, the term "pit and fissure caries" best describes lesions
located on:
A. Smooth surfaces
, B. Occlusal surfaces of posterior teeth
C. Interproximal areas
D. Root surfaces
12. The working length determination for endodontic treatment is best estimated by:
A. Visualizing radiographic apex only
B. Electronic apex locator combined with radiograph
C. Measuring crown length only
D. Tactile sensation
13. Which suture material is non-resorbable?
A. Polyglactin 910
B. Catgut
C. Nylon
D. Polyglycolic acid
14. A dry socket (alveolar osteitis) most commonly occurs after:
A. Scaling and root planing
B. Simple crown preparation
C. Mandibular third molar extraction
D. Root canal therapy
15. The minimal interincisal opening considered adequate for most dental procedures is
approximately:
A. 10 mm
B. 20–25 mm
C. 40 mm
D. 60 mm
16. During a basic life support (BLS) adult single-rescuer CPR, the compression-to-ventilation
ratio is:
A. 15:2
B. 30:2
C. 20:2
D. 10:1
17. The appropriate immediate management of a small avulsed tooth (milk tooth) in a child
is:
A. Replant immediately if permanent; for primary do not replant
B. Always replant primary tooth
