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EFDA Study Practice test (Temporaries) 67
Questions and Answers
Which of the following items for custom provisional crown construction needs to be obtained prior to tooth preparation? -Bite registration -Preliminary alginate impression -Measurement of tooth height -Intraoral photograph Preliminary alginate impression During infection control procedures, preformed crowns that have been tried in a patient's mouth are considered which type of item? -Non-critical -Clean -Semi-critical -Critical Semi-critical When restoring a primary tooth that is expected to shed within two years or less, which temporary restorative material is indicated? -Noble -Indirect -Provisional -Intermediate Intermediate
In the infection control process, how is a preformed crown classified after it is tried in a patient's mouth and not used? -Contaminated -Non-critical -Semi-critical -Critical Semi-critical What cement lacking strength and long-term durability can be used for cementation of indirect provisional restorations? -ZOE type I -Zinc phosphate type I -ZOE type II -Zinc phosphate type II ZOE type I What is one advantage of using a bis-acryl composite material for a provisional restoration? -Increased protection of the gingiva -Low cost to produce -High heat and shrinkage -Good tissue biocompatibility Good tissue biocompatibility What type of pressure should be applied to remove a provisional crown or bridge? -Constant -Finger -Incremental -Pinpoint Finger
-Zinc phosphate Reinforced zinc oxide-eugenol Temporary cementation of a cast restoration is recommended -prior to permanent cementation of a denture. -when the cast restoration involves gold or porcelain. -when the tooth exhibits abnormal sensitivity. -prior to permanent cementation of a three-unit bridge. when the tooth exhibits abnormal sensitivity. Which of the following best describes the purposes of provisional crowns? -Hold a fractured tooth together, provide an esthetic appearance, and prevent food impaction -Reduce tooth sensitivity, protect the margins of the preparation, and prevent shifting of adjacent teeth -Bond adjacent teeth to provide stability, aid in speech, and crush food more efficiently -Maintain the function of the tooth, serve as a permanent replacement of missing tooth structure, and hide the buildup material Reduce tooth sensitivity, protect the margins of the preparation, and prevent shifting of adjacent teeth Which of the following home-care instructions is NOT appropriate for the patient who just had a provisional restoration cemented on a tooth? -Refrain from snapping the floss out of the contact. -Immediately call the office if the provisional becomes loose. -Brush the area normally to keep it clean. -Normal function and diet can be resumed once the numbness has gone. Normal function and diet can be resumed once the numbness has gone.
What provisional restorative material generates heat during the polymerization stage and may traumatize the pulp or soft tissues? -Dual-cured composite -Self-cured composite -Light-cured acrylic -Chemical-cured acrylic Chemical-cured acrylic What is one positive effect of a temporary crown that is over-contoured at the gingival margin? -Prevents plaque accumulation at the gumline -Assures adequate retention of the provisional restoration -Helps establish appropriate interproximal contacts -Contributes to plaque removal Contributes to plaque removal For easier removal of a provisional crown or bridge, the operator/assistant could -fill the internal portion of the provisional with temporary cement material. -fill the provisional temporary with a nonstick temporary cement material. -apply a small amount of cement around the internal provisional margins. -add a small amount of fluoride to the temporary cement material when mixing. apply a small amount of cement around the internal provisional margins. Which of the following materials are commonly used to create custom provisional restorations? -Polycarbonate and methylmethacrylate -Bis-acryl and methylmethacrylate -Polycarbonate and bis-acryl -Methylmethacrylate and glass ionomer Bis-acryl and methylmethacrylate
Produces a sedative effect on the pulp The primary purpose of a provisional restoration is to provide -supplemental support to the opposing arch. -permanent replacement of the tooth structure. -transitional resistance and arch realignment. -temporary function and esthetics. temporary function and esthetics. Provisional restorative materials are designed to -serve as a short-term restoration. -fill small pits and fissures in the enamel. -cover the major portion of a clinical crown. -restore primary teeth. cover the major portion of a clinical crown. When placing a temporary restoration into a tooth prepped for an MOL inlay, start by placing and the condensing the material into the -occlusal floor. -distal box. -mesial area. -lingual wall. mesial area. When is excess temporary resin cement best removed? -After drying the involved tooth -After it has fully set
-During the early gel stage -Just before the final setting stage During the early gel stage What temporary cement is used for its sedative effect? -Resin -Hydrocolloid -Polycarboxylate -Zinc oxide-eugenol Zinc oxide-eugenol The maximum space between the margin of the tooth preparation and the trim line of the provisional crown should be no more than -1.0 mm -0.10 mm. -0.5 mm. -0.05 mm. 0.05 mm. Which forceps is used to remove a provisional crown? -Backhaus towel clamp -# -Universal -Orthodontic Backhaus towel clamp If a preformed crown is tried in the mouth and NOT selected for use, it must be
Which of the following statements should be included in home-care instructions for temporary crowns? -Avoid drinking cold beverages -Do not worry if it loosens and falls out -Avoid chewing sticky foods -Floss vigorously Avoid chewing sticky foods When removing temporary cement, the operator should carefully -clean interproximals with plaque removers. -move the instrument in a horizontal direction. -move the instrument in a vertical direction. -clean interproximals with interdental brushes. move the instrument in a horizontal direction. The shell of a preformed provisional crown for anterior teeth is made out of what type of tooth- colored material? -Stainless steel -Porcelain -Glass ionomer -Polycarbonate Polycarbonate Preformed provisional crowns tried in a patient's mouth but not selected for use are considered which category of patient care item by the Centers for Disease Control and Prevention? -Semi-critical items -Non-critical items -Hyper-critical items -Critical items
Semi-critical items Which of the following is a favorable characteristic of a provisional crown? -The provisional crown should have strong, tight contact with adjacent teeth. -The provisional crown margin extends below the margin of the preparation. -The provisional crown should be a different color to distinguish it from the adjacent teeth. -The occlusal surface of the provisional crown does not extend above the occlusal plane of adjacent teeth. The occlusal surface of the provisional crown does not extend above the occlusal plane of adjacent teeth. In order to minimize the loss of water from evaporation when mixing a cement, it is recommended to -place materials on mixing pad before seating the patient. -dispense the powder first. -dispense the liquid first. -place materials on mixing pad 15 minutes prior to use. dispense the powder first. Indirect restorations are also referred to as -castings. -polymers. -provisional. -temporaries. castings Preformed crowns that are tried in the mouth but not selected for use should be -disinfected.
Which type of intermediate restorative material is soothing to the pulp? -Zinc oxide-eugenol -Zinc phosphate -Calcium hydroxide -Copal varnish Zinc oxide-eugenol When fabricating a provisional crown, the crown should resemble the natural tooth in its appearance, contour, contact and -occlusion. -mesial-distal relationship. -color. -buccal-lingual relationship. occlusion. Which of the following preformed crowns is considered the most durable? -Aluminum shell -Polycarbonate -Stainless steel -Celluloid Stainless steel An exothermic reaction is produced when mixing cement that contains -composite resin. -polycarboxylate. -zinc oxide-eugeol. -zinc phosphate. zinc phosphate.
Which ingredient in an intermediate restorative material has a sedative effect on the pulp? -Camphor -Eugenol -Methylmethacrylate -Peroxide Eugenol What provisional restorative material may be applied to a preformed polycarbonate crown to provide a customized internal fit? -Glass ionomer -Polycarboxylate -Intermediate restorative material -Composite Composite When zinc oxide-eugenol has been placed as a temporary restoration, once the pulp has healed, all of it must be thoroughly removed before which type of restoration can be placed? -Stainless steel crown restoration -Composite resin restoration -Amalgam restoration -Gold inlay restoration Composite resin restoration What is considered to be the final check in cementation of a temporary provisional? -Isolation -Occlusion -Sizing
-Assist in plaque prevention -Assist in proper chewing and swallowing -Allow for proper speech and communication Prevent the prepared tooth from drifting When using zinc oxide-eugenol to cement provisional restorations, it is important to -completely fill the provisional. -fill the provisional halfway. -line the margins of the provisional. -line the entire inside perimeter of the provisional. completely fill the provisional. Which of the following is NOT used in a proper setup for seating a stainless steel crown? -Curved scissors -Cleoid discoid -Floss -Contouring and crimping pliers Cleoid discoid Which of the following is a property of bis-acryl provisional material? -Biocompatible with gingival tissue -High shrinkage rate during polymerization -Inexpensive compared to acrylic -High heat during polymerization Biocompatible with gingival tissue When working with provisional restorations, it is important to remember that
-only anterior teeth should be prepped. -the coverage should extend below the margin. -coverage is available for single unit teeth. -the cervical margin should fit loosely. coverage is available for single unit teeth. Which cement is likely to be used for cementation of a temporary provisional restoration? -Zinc oxide-eugenol -Glass ionomer -Polycarboxylate -Zinc phosphate Zinc oxide-eugenol Which cement is classified as temporary? -Zinc oxide non-eugenol -Calcium hydroxide -Glass ionomer -Zinc polycarboxylate Zinc oxide non-eugenol When the provisional crown's margin overextends the margin of the prepared tooth, the result may be -gingival recession. -hyperocclusion. -unintentional diastema. -marginal leakage. gingival recession.
High shrinkage during polymeriza
