The Expanded Function Dental Auxiliary (EFDA) certification allows dental assistants to perform advanced clinical procedures that go beyond standard chairside support. Because the scope of practice is defined at the state level, requirements differ across Pennsylvania, Ohio, Virginia, and other states that recognize the EFDA credential. Studying with a practice test PDF gives you a portable, print-ready resource you can use at home, at the clinic, or between patient appointments without needing a device or internet connection.
This page provides a free EFDA practice test PDF covering the major content areas tested in state EFDA examinations. Whether you are preparing for a written board, a state-administered competency exam, or a program exit assessment, the questions in the PDF mirror the clinical knowledge and procedural reasoning those exams require. You can download, print, and annotate the file however works best for your study method.
An EFDA — sometimes called an Expanded Duties Dental Assistant or Dental Expanded Function Auxiliary depending on the state — is a licensed or certified dental assistant who has completed additional clinical training and passed a state-approved examination. The credential authorizes the holder to perform restorative and preventive procedures under the direct or general supervision of a licensed dentist, depending on state law.
States that offer the EFDA credential include Pennsylvania, Ohio, Virginia, Indiana, and others. Each state defines its own list of permitted expanded functions, minimum training hours, and examination requirements. Pennsylvania, for example, requires completion of an approved EFDA program and a practical examination administered through an approved testing agency. Ohio has its own written and clinical competency requirements. Before sitting for any EFDA exam, confirm the specific requirements with your state dental board.
The clinical procedures authorized under EFDA practice typically span restorative dentistry, preventive services, infection control, radiography, and dental materials management. Mastery of the underlying science — tooth anatomy, occlusion, material properties, and aseptic technique — is required alongside the procedural skills themselves. The efda certification practice tests on this site cover all these areas and are free to use online in addition to the printable PDF.
The scope of procedures permitted under EFDA licensure varies by state, but the following functions appear on most state-approved lists. Understanding each procedure in depth is the foundation of exam readiness.
Coronal polishing removes extrinsic stain and soft deposits from coronal tooth surfaces using a rubber cup or brush with polishing paste. The technique requires adaptation of the cup to subgingival margins, controlled speed (slow-speed handpiece), and systematic movement to avoid skipping surfaces. Fluoride application follows coronal polishing in most preventive protocols — varnish application with a microbrush versus fluoride tray delivery are both tested methods.
Sealant placement requires the EFDA to isolate the tooth, apply phosphoric acid etch for 15–30 seconds, rinse and dry thoroughly, apply primer or bonding agent per manufacturer instructions, place the sealant material, and light-cure according to the specified exposure time. Incomplete etching and moisture contamination are the most common sealant failures — both are EFDA exam topics.
Alginate impression taking tests the candidate's knowledge of powder-to-water ratios, water temperature effects on setting time (warm water accelerates set, cold water retards it), and proper tray selection. Distortion caused by early tray removal or delayed pouring is a key failure point candidates must recognize and prevent.
Placing and carving amalgam requires knowledge of Tofflemire matrix band and retainer setup versus sectional matrix systems, condensation technique using overlapping strokes, and carving anatomy that matches the occlusal contacts of the opposing arch. Overhang removal with scalers or finishing burs is a post-carving step frequently tested. Composite placement uses an incremental technique — typically 2 mm layers — with each increment light-cured before the next is placed to minimize polymerization shrinkage and voids.
Additional permitted procedures include placing and removing the rubber dam for moisture control and field isolation, fabricating provisional crowns and bridges using acrylic or bis-acryl composite materials, suture removal following the prescribed healing interval, applying desensitizing agents to treat dentin hypersensitivity, and pulp vitality testing using electronic pulp testing devices or cold stimulus tests with Endo-Ice or ice sticks.
EFDA written examinations are organized around clinical content domains. The proportions differ by state, but the following domains appear consistently across Pennsylvania, Ohio, and Virginia-style examinations.
Restorative Procedures is the largest domain. Questions cover matrix system selection — the Tofflemire universal matrix retainer for Class II amalgam restorations versus sectional matrix systems such as the Palodent or V3 ring for tighter proximal contacts. Condensation technique, incremental composite placement, finishing bur selection by grit and shape, and polishing disc sequencing (coarse through superfine) are all examined. Candidates must also distinguish between polishing amalgam (prophy paste, rubber cups) and finishing composite (polishing discs, flexible discs, pointed silicone polishers).
Preventive Procedures questions test coronal polishing rubber-cup technique, fluoride varnish versus tray delivery, the sealant placement sequence (etch → rinse → dry → prime → bond → cure), and moisture control during sealant placement. Candidates must also know contraindications for sealant placement, including active caries that has broken through enamel and heavy plaque with no ability to isolate.
Infection Control and OSHA questions address sterilization monitoring with biological indicators (spore tests), the correct cycle times and temperatures for autoclave sterilization, personal protective equipment standards, handling and disposal of contaminated sharps, and the correct procedure following a needlestick or splash exposure. Surface disinfection protocols — spray-wipe-spray, contact time requirements — are also tested.
Radiography questions distinguish bisecting angle versus paralleling technique in terms of film or sensor placement, patient positioning, and the types of distortion each produces. Elongation, foreshortening, cone-cutting, and overlapping are the four primary film placement errors candidates must identify from a description or image. Digital sensor handling, radiation protection for patients and operators, and proper exposure settings by patient size are standard topics.
Dental Materials questions test the mixing ratios and working times for zinc oxide eugenol cement, glass ionomer cement, and resin-modified glass ionomer. Candidates must know the powder-to-water ratio for alginate (follow manufacturer instructions, but typically one scoop powder per one measure water), the effect of temperature on setting time, and how to prevent distortion when removing and storing the impression before pouring. Bite registration material properties and the technique for accurate occlusal registration are also examined.
Clinical Support questions address four-handed dentistry principles: the zone of operation (operator and assistant zones), instrument transfer technique using a modified pen grasp and single-hand transfer, high-volume evacuator (HVE) placement to avoid obstructing the operator's field, air-water syringe technique for rinsing and drying, and aspiration technique for moisture and debris control. Candidates must also understand ergonomic positioning and how improper positioning causes repetitive strain injuries over a clinical career.
Print the PDF in its entirety and work through the questions under timed conditions to simulate the exam experience. Set a timer based on the number of questions in the PDF relative to your state exam time limit. If your state exam allows 90 minutes for 100 questions, aim to complete each practice section at the same pace before checking your answers.
After completing each section, review every question — not just the ones you missed. Correct answers you chose by elimination or guesswork should be revisited to confirm the underlying reasoning. EFDA exam questions are clinical in nature, meaning a single question may require you to integrate knowledge from two or three content areas simultaneously. A question about placing a composite restoration, for instance, may combine material handling (incremental technique), infection control (glove integrity, asepsis), and radiography (pre-op film review) in a single clinical scenario.
Use the margins on the printed PDF to annotate explanations in your own words. Translating each correct answer into a brief clinical rationale — why this answer is correct and why each distractor is wrong — reinforces retention more effectively than passive review. Create a personal error log that tracks which content domains produce the most misses. Targeted review of weak domains in the days before the exam is more efficient than re-reading content you already know well.
Pair the printable PDF with the free online EFDA practice tests available on this site. Online testing includes immediate feedback and answer explanations, while the printable PDF builds endurance and mirrors the paper-based format used in some state practical examinations. Together, both formats cover the full range of EFDA exam question styles and difficulty levels.
Dental materials is one of the most detail-heavy domains on EFDA exams, and it is also one of the areas where candidates lose the most points. The properties, manipulation, and clinical indications of restorative and supporting materials appear across multiple question types.
Amalgam is a self-setting alloy of mercury with silver, tin, and copper. The EFDA does not typically mix amalgam (that is done by the dental assistant using a capsule triturator), but the EFDA is responsible for condensation — packing the material into the prepared cavity before it reaches its working time limit. Condensation uses a series of overlapping, parallel strokes with progressively larger condensers. Burnishing the margins before carving adapts the alloy to cavity walls and reduces marginal gaps. Carving follows condensation and must reproduce the natural occlusal anatomy using discoid-cleoid carvers and the hollenback carver for proximal contacts.
Composite resin is a tooth-colored restorative material available in multiple shades matched to the VITA shade guide. Composite is technique-sensitive: contamination by saliva or blood breaks the bond between composite and the etched enamel surface, causing premature failure. The EFDA places composite in increments no thicker than 2 mm, light-curing each layer for the manufacturer-specified time (typically 20–40 seconds with an LED curing light). Shade selection happens before rubber dam placement and isolation, because dehydrated teeth appear lighter than their true shade after prolonged rubber dam use.
Glass ionomer cement and resin-modified glass ionomer (RMGI) are used for base or liner placement, Class V cervical restorations, and cementation of orthodontic bands. Conventional glass ionomer undergoes an acid-base setting reaction and releases fluoride ions into surrounding tooth structure — a benefit for high-caries-risk patients. RMGI includes a resin component that is light-cured in addition to the chemical set, giving it higher strength and moisture resistance. Mixing ratios must follow the manufacturer specification; over-spatulation or under-spatulation both alter the working time and final set strength.
Zinc oxide eugenol (ZOE) cement has a sedative effect on the pulp due to the eugenol component, making it useful as a temporary restoration or base beneath amalgam when the cavity is near the pulp. ZOE is contraindicated under composite restorations because eugenol inhibits polymerization of resin materials, leaving the composite soft and porous. This contraindication is a frequently tested EFDA exam fact.