NBDE Study Guide 2026
Everything you need to pass the NBDE exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 NBDE Exam Format at a Glance
📚 NBDE Topics to Study (93)
✍️ Sample NBDE Questions & Answers
1. In a patient with poorly controlled hypertension, the maximum recommended epinephrine dose per dental appointment is:
The AHA recommends limiting epinephrine to 0.04 mg (approximately two cartridges of 1:100,000) per appointment in patients with significant cardiovascular disease or uncontrolled hypertension.
2. What is the primary goal of scaling and root planing in the treatment of periodontitis?
Scaling and root planing aims to remove calculus and bacterial biofilm from root surfaces to reduce periodontal inflammation and promote tissue healing.
3. Which of the following clinical scenarios is most indicative of a primary periodontal lesion with secondary endodontic involvement?
A primary periodontal lesion begins with marginal periodontitis. This would be characterized by generalized bone loss and wide pocketing around a tooth that initially tests vital. The infection can then progress apically to involve the pulp via lateral canals or the apical foramen, causing a secondary endodontic lesion where the pulp becomes necrotic. A deep, isolated pocket on a non-vital tooth suggests a primary endodontic lesion draining coronally.
4. Which local anesthetic has the LONGEST duration of action for dental nerve blocks?
Bupivacaine has the longest duration of action among dental local anesthetics, providing 4–12 hours of pulpal anesthesia with a vasoconstrictor.
5. Which disease is characterized by necrosis of the marginal gingival tissue and interdental papillae?
Necrotizing periodontal disease (NPD), including Necrotizing Ulcerative Gingivitis (NUG), is specifically characterized by the rapid onset of necrosis and ulceration of the gingival margins and interdental papillae. This leads to the classic "punched-out" appearance of the papillae, often accompanied by pain, bleeding, and a distinctive fetid odor. Other forms of periodontal disease do not primarily present with tissue necrosis as a defining feature.
6. In adolescents, when minor fractures occur to the permanent teeth, it is prudent to use which type of restoration?
Composite resin restorations are the preferred choice for minor fractures in permanent teeth of adolescents due to their conservative nature and excellent aesthetics. They bond directly to the tooth structure, preserving maximum natural tooth tissue, which is crucial for young permanent teeth that may still have large pulp chambers. Other options like full crowns are more aggressive, and amalgam is less aesthetic.