EFDA Study Guide 2026
Everything you need to pass the EFDA 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.
📋 EFDA Exam Format at a Glance
📚 EFDA Topics to Study (69)
✍️ Sample EFDA Questions & Answers
1. A Class V composite restoration on the facial surface of tooth #9 requires etching of:
Total-etch technique involves etching both enamel and dentin to maximize bond strength, especially at cervical margins where enamel may be minimal.
2. When taking a preliminary alginate impression, the dentist notices voids in the palate area. What is the most likely cause?
Voids in the impression are commonly caused by air bubbles trapped during mixing or when the material fails to flow into all areas during tray placement.
3. When mixing addition silicone (PVS) impression material, what should the clinician avoid?
Sulfur compounds in latex gloves can inhibit the polymerization of addition silicone, resulting in a tacky, unset surface.
4. Which property of dental amalgam is described as the tendency to expand or contract under stress without fracturing?
Creep is the slow plastic deformation of amalgam under sustained compressive load, which can lead to marginal breakdown and ditching over time.
5. When evaluating a completed sealant clinically, which finding would require immediate repair or replacement?
An explorer catching in a void indicates incomplete coverage or air entrapment, creating a site for plaque accumulation and caries initiation under the sealant.
6. Which factor most significantly affects the long-term retention rate of pit and fissure sealants?
Adequate moisture control is the single most critical factor in sealant retention because contamination prevents proper bonding to etched enamel.