Expanded Function Dental Assistant (EFDA) Board Practice Exam

These questions are part of the practice quiz. Start practicing

• True or False: Oblique ridges are found on maxillary first and second molars and involve the ML and DB cusps.
• What is the primary reason for using a mylar strip during a composite restoration?
• When using discs to finish a composite restoration, which of the following is recommended?
• What is an advantage of bevel placement at the margins during a composite preparation?
• Which materials require copal varnish before placement in a tooth?
• What is the primary function of dental floss in oral hygiene?
• Where is the cusp of Carabelli located?
• What type of bond does prime and bond adhesive form with enamel?
• Where is the periodontal ligament (PDL) located?
• What is typically used to refine margins in dental restorations?
• Retention in a Class II preparation is enhanced primarily by which method?
• Which statement best describes the biological response of tissue to calcium hydroxide?
• Which part of the maxillary first molar is the oblique ridge typically formed between?
• Where is the enamel the thinnest?
• Regarding the placement of a large Class IV composite restoration, which statement is true?
• High copper amalgam content results in which of the following?
• When should a dental assistant evaluate the contacts of a restoration?
• In dental anatomy, what is the significance of the cavo-surface margin?
• When preparing to finish and polish, if your exploring point catches as it passes from tooth to restoration, the area is described as?
• Which of the following is true regarding the air inhibited layer on composite resins?
• What do you call the junction of three internal walls in a cavity preparation?
• During the placement of a large restoration, where are pins most effectively placed?
• What should be the primary consideration when deciding to use a base in a restoration?
• Which is the best way to assure tight proximal contacts with class II composite restorations?
• A mesioingual restoration on tooth number 7 is classified as which class?
• Is copal varnish compatible with composite materials?
• What is the primary reason for overfill during the condensation of an amalgam?
• Which anatomical feature must be reproduced in a class V buccal restoration on tooth #21?
• Which of the following factors can influence the success of amalgam restorations?
• Which of the following materials has the same coefficient of thermal expansion as natural tooth structure?
• What is the purpose of the rubber dam in dental procedures?
• Which of the following is a reason for finishing and polishing amalgam restorations?
• Which type of matrix retainer is placed from the lingual?
• Which line angle serves as a retention groove for a glass V posterior amalgam preparation?
• Which of the following statements is not true regarding the occlusion on a Class II restoration?
• Your exploring point catches as it passes from restoration to tooth on the facial surface of your composite. How should this be corrected?
• When preparing for a class II restoration, what is checked to ensure the proper cavity preparation?
• What is the term for where the preparation meets the uncut tooth?
• Does plash result in a stronger amalgam?
• Which tooth surfaces are not normally susceptible to pit and fissure decay?
• During the application of a glass ionomer restoration, what is essential to maintain for optimal bonding?
• What should be done if the 12/13 contact is too tight for a wedge when banding a DOA on tooth 12?
• Which of the following is all organic?
• What is essential to do before placing a matrix band for a posterior restoration?
• On a patient with ideal tooth alignment, which embrasure will you attempt to place the wedge for a class II MO amalgam restoration?
• Where is the contact of posterior teeth typically located when viewed from the buccal?
• What is the correct order of materials to use when performing a deep composite restoration near the pulp?
• Which two materials can combine during trituration to form the Gamma II phase which is NOT desirable?
• Which of the following is not true regarding posterior composite class II placement?
• How does the ratio of mercury to alloy affect the properties of an amalgam?
• What is a benefit of high copper content in some amalgam brands?
• What tool would be used to eliminate gingival overhangs during the finishing of an amalgam restoration?
• Which factor does NOT contribute to the longevity of a bonding agent?
• If you are assisting a left-handed dentist, where do you sit?
• What type of material combines the properties of glass and resin?
• Which of the following is a common property of dental cements?
• Which of the following describes a Class II cavity preparation?
• What is a common instrument used to check for overhangs after finishing an amalgam restoration?
• When placing a wooden wedge during the restoration of a class I restoration, which statement is incorrect?
• What type of bur is best suited for contouring composite restorations?
• The gamma 2 phase of amalgam weakens its strength and is the result of a combination of which two metals?
• What is the purpose of using a matrix band during amalgam restorations?
• Which material is recommended for restoring class V abrasion areas due to its adherence to tooth structure?
• What type of restoration is typically used for teeth with extensive decay?
• What is the primary consideration when restoring a tooth with a large class IV composite?
• Which clamp could you choose to give you increased access to a facial class V on #25?
• In an ideal class II amalgam restoration, what characteristic describes the occlusogingival contact area?
• What is the purpose of using a matrix system in posterior restorations?
• Which concentration of phosphoric acid is used for total acid etch technique with composite?
• What is the primary purpose of a glass ionomer base in dental restorations?
• What can excessive expansion of an amalgam restoration be caused by?
• Which phase of amalgam is associated with higher strength and lower corrosion?
• Which term describes where the unprepared tooth structure meets the preparation?
• What type of bond is formed between prime and bond adhesive and dentin?
• What is a potential risk of using inadequate amounts of mercury in amalgam?
• What is the correct sequence for finishing and polishing a class II amalgam restoration?
• In which scenario would the use of a gingival retractor clamp (#212) be most appropriate?
• Which material is commonly used to fill small cavities?
• Which tooth has five functional cusp tips?
• Which adhesive is commonly used with composite materials?
• Your class V composite restoration is over contoured. Which would not be recommended to contour the anatomy properly?
• Which of the following is not a filler particle found in composite resin?
• On which tooth would you need to replicate an oblique ridge when restoring an MOD?
• From an occlusal view, where is the contact area typically located between posterior teeth?
• Which type of restoration might use glass ionomer as a material?
• What does the term "line angle" refer to in a cavity preparation?
• Which characteristic is NOT true about glass ionomers?
• What is true about a modified preparation for an anterior composite restoration?
• Which tooth has five cusp tips, but not all are functional?
• Proximal caries typically occurs in which location?
• What is the function of a liner in cavity preparations?
• What is the best description of the biological response of tissue to zinc oxide-eugenol cement?
• Which of the following would be recommended to recreate a lingual fossa on a large class III composite?
• What is the primary purpose of using a green finishing stone when finishing amalgam?
• Which finishing stone is suitable for removing a submarginal area in amalgam polishing?
• When a great amount of pressure and strength is required to carve an amalgam, which technique is recommended?
• Which finishing strip is preferred for interproximal surfaces?
• Ergonomic operator positioning includes which of the following?
• Which of the following is a reason for an EFDA, working alone, to choose to use a rubber dam for a composite restoration placement?
• Which anatomical feature would not be placed in a MOD on tooth 29?
• Which mandibular premolar is most likely to have three cusps?
• What will amalgam look like if the capsule did not contain enough mercury?
• Which of the following tools is NOT recommended to remove gingival flash?
• Which material has a monomer of Bis-GMA and fillers that increase strength but are harder to polish?
• Which acid etchant is used for glass ionomer restorations and for what length of time?
• Which tooth is correctly associated with an oblique ridge and its involved cusp?
• Which of the following types of restorations would be taken slightly out of occlusion?
• What is the most important factor to assess when evaluating occlusal adjustments post-amalgam restoration?
• Which of the following materials is most commonly used in direct pulp capping?
• Where would a right handed operator be advised to sit to restore a large class IV restoration on #9 for a patient?
• In amalgam chemistry, which metal is primarily responsible for setting expansion?
• Which of the following is a line angle that would contain a retention feature for you to condense into with a class II amalgam preparation?
• What is the largest embrasure in dental anatomy?
• When placing a rubber dam, which step is not required?
• When should the mercury rich layer of amalgam, known as plash, be removed?
• What characteristic is essential for the success of a composite restoration?
• What is the primary goal of good occlusal adjustment?
• Which dental material is effective for sealing dentinal tubules?
• Which cells are responsible for building reparative dentin, and which dental material stimulates this process?
• What is the term for over drying of dentin?
• Are amalgam restorations designed using conventional preparations?
• The most stable and firm support for a finger fulcrum is the:
• Which material is recognized as a poor thermal conductor and serves as a good thermal insulator?
• What is the primary function of polymerization in dental materials?
• What should be added to amalgam to enhance its strength?
• Which of the following conditions could contraindicate the placement of a posterior composite restoration?
• A contra-angle matrix retainer may be indicated when restoring which of the following MN molar preparations?
• Which tooth structure is approximately 70% inorganic materials and contains tubules?
• What is not a legal duty for an EFDA in Ohio?
• Which composite is known for having a smoother finish due to smaller particle size?
• What is the immediate step after placing the rubber dam while restoring a class III composite resin?
• What is a true statement regarding copal varnish?
• The gingival retractor clamp (#212) is typically used to improve access for which classification of caries?
• After removing the matrix band, you discover your class II amalgam has a large overhang. Which instrument would not be recommended for removing it?
• The most desirable finish of a composite restoration will be achieved by the use of which item?
• When condensing amalgam into an ideal depth MOD preparation, which area should be condensed first?
• Which two anatomical features create an oblique ridge and which cusps are involved?
• When punching holes in a rubber dam for a Class V buccal amalgam preparation, how should the holes be positioned?
• Which characteristic of amalgam is improved by the presence of zinc?
• What could an open margin on a restoration result in?
• Which material in amalgam aids in bonding to mercury?
• How many functional cusps does a maxillary second molar typically have?
• What effect does proper amalgam condensing technique have?
• To reduce mercury contamination in the dental office, which action should be avoided?
• What is the purpose of acid etching enamel before placing a sealant resin?
• What is the purpose of using high-speed handpieces?
• Which material in amalgam is known to slow corrosion?
• A matrix retainer and band properly placed exhibit all of the following EXCEPT:
• Which of the following statements describes the desired occlusion when restoring a class II amalgam?
• Which restorative material is known for its ability to release fluoride over time?
• Why should a floss ligature be tied to a clamp during retraction?
• What is the correct order of steps when placing a class III composite with a rubber dam?
• What is the primary purpose of using a rubber dam in restorative dentistry?
• Enamel, being the hardest body tissue, is composed of:
• What is commonly a consequence of improper amalgam placement?
• The result of moisture contamination when condensing with zinc containing amalgam is?
• Which condition is considered when assessing the quality of amalgam restorations?
• What is the function of burs in the context of finishing amalgam restorations?
• Most amalgam contains approximately what percentage of mercury?
• What is the term for the junction of two internal walls in a cavity preparation?
• When is a prime and bond agent placed on a tooth that will be restored with a glass ionomer liner and composite?
• Which issue can be corrected by finishing and polishing an amalgam rather than replacing it?
• What result does over trituration have on the amalgam mix?
• All of the following are true regarding anatomy and occlusion of a class IV composite restoration on tooth 25 except:
• What classification would be given to an amalgam restoration in the lingual pit of #10?
• Which material is commonly used to temporarily restore a tooth while awaiting a permanent restoration?
• What instrument is primarily used for measuring periodontal pocket depths?
• Which statement is true about the placement of a glass ionomer base in a deep oblique amalgam preparation?
• What is the primary composition of enamel?
• Which type of bur is preferred for finishing composite restorations due to its smooth cutting action?
• What is the primary purpose of using a bevel in cavity prep design?
• True or False: Retention grooves are positioned towards the pulp.
• Conventional composites are characterized by which type of filler particles?
• Where is the enamel the thickest?
• How would you describe and correct a margin where the exploring point only bumps up as it passed from tooth to restoration?
• What is the role of odontoblasts in dental pulp tissue?
• What is the main advantage of using copper in dental amalgams?
• Which instrument would be used for a Class II amalgam preparation but not for a Class V amalgam on tooth #3?
• After etching for 15-30 seconds when restoring with composite, what should be done next?
• In amalgam restorations, the elimination of voids is primarily important for which reason?
• Retention grooves for a Class V amalgam preparation are generally located at which line angles?
• What is the main purpose of applying a bonding agent in adhesive dentistry?
• Which of the following tasks can not be delegated to EFDA's in Ohio?
• Mylar strips are placed __________ acid etch.
• What might be a consequence of unprotected pulp during a dental procedure?
• Which material is commonly used for temporary restorations?
• Which dental material is known for its ability to promote healing in the pulp area?
• Which type of dental cement is typically used for permanent restorations due to its strength?
• Which of the following is not true regarding a properly assembled matrix retainer and band for an amalgam restoration?
• Which dental material is known for chemically bonding to dentin?
• What can be a reason for a restoration to "feel high" to the patient?
• What anatomical structure on the occlusal surfaces of a mandibular second molar connects the mesial, central, and distal fossas?
• What is the main reason for using glass ionomer in restorations?