Written Questions and Answers for RDA (Dentistry) Exam A+ Graded and Verifie d What type of wax is used to form a wall around a preliminary impression when it is poured? Correct Answer -boxing wax To extend an impression tray, what type of waxed is use? Correct Answer -rope/ utility wax What type of material is used to take a patient's bite? Correct Answer -bite registration material What is placed to prevent a tray from seating too deeply onto the arch or quarter? Correct Answer -spacers Where would you commonly find the dental laboratory in a dental office? Correct Answer -in a separate space away from patient care What type of specialty practice might have a more extensive laboratory? Correct Answer -fixed prosthodontics and orthodontics An example of a contaminated item commonly found in the dental laboratory would be a (n) Correct Answer -impression What piece of lab equipment is used to grind away plaster or stone? Correct Answer -Model trimmer What piece of laboratory equipment does the dentist use to determine centric relation from a diagnostic model? Correct Answer -articulator What dental material is used to fabricate dental models? Correct Answer -gypsum hydro - means Correct Answer -water Another name for irreversible hydrocolloid is Correct Answer -alginate how is irreversible hydrocolloid mixed? Corr ect Answer -mixing bowl Elastomeric materials are selected for what type of impression? Correct Answer -final How are elastomeric materials supplied? Corr ect Answer -paste, cartridge, putty Which viscosity of final impression material is applied first to the teeth Correct Answer -light body what does the dentist use to express light body impression material around a prepared tooth? Correct Answer -syringe What system accomplishes the mixing of final impression material for the assistant? Correct Answer -Auto -mix ______ is most commonly used for taking a bite registration. Correct Answer -bite registration material What tray type is most commonly selected when zinc oxide -eugenol (ZOE) bite registration paste is used? Correct Answer -Gauze tray Baseplate wax is ______ prior to placement in the patient's mouth for a bite registration. Correct Answer -warmed A preliminary impression is ______ prior to transport to the lab to pour up. Correct Answer -rinsed, disinfected, wrapped in a moist paper towel, and placed in a precautionary bag If increments in the powder of dental materials vary, which size is commonly brought into the liquid first/ Correct Answer -half of the material How do you load a crown with permanent cement? Correct Answer -line the interior surface. How is polycarboxylate cement liquid supplied? Correct Answer -tube or squeeze bottle How should polycarboxylate cement appear after the mixing process? Correct Answer -Glossy Can glass ionomer cements be used as a restoration? Correct Answer -yes What ingredient in the powder of glass ionomer cement helps in inhibiting recurrent decay? Correct Answer -calcium Can resin cements be used under metal casting? Correct Answer -yes The purpose of dental liners is to Correct A nswer -protect the pulp from any type of irritation On what tooth structure is calcium hydroxide placed? Correct Answer -dentin Which is not a unique characteristic of calcium hydroxide? Correct Answer -replaces the needs for dentinal sealer
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