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Q1: Who does the delivery of dental materials most often fall to? A1: The dental assistant Q2: The first acceptable amalgam formula was developed by ______ in
A2: G. V. Black Q3: What is today's approach to dental care referred to as? A3: Evidence-based dentistry Q4: In history, the earliest recorded mention of restorative dentistry occurs when? A4: 600 BC Q5: Silver paste was first mentioned as a restorative material for the teeth by the: A5: Chinese Q6: Which of the following is not a classification of dental materials? A6: Biological Q7: What is Dr. Frederick McKay credited with? A7: Noting dental fluorosis in Colorado Springs Q8: Dental materials considered devices, as well as over-the- counter products sold to the public, are subject to control and regulation of the _____ Center for Devices and Radiological Health. A8: Food and Drug Administration Q9: Which of the following is the best thermal conductor? A9: Gold
Q10: Some materials give off heat when mixed. What is this called? A10: Exothermic reaction Q11: Which term describes the thicker or thinner a material is? A11: Viscosity Q12: Which of the following has been suggested to delay formation of surface tarnish on dental amalgams? A12: Polishing Q13: The staining of resins and acrylics from repeated exposure to coffee, tea, and other dyed beverages is due to: A13: Water sorption Q14: Microleakage into the interface between tooth structure and restorative material is responsible for much of the _____ observed following tooth restoration. A14: Marginal staining, postoperative sensitivity, recurrent decay Q15: Which of the following dental restorative materials is particularly susceptible to corrosion? A15: Dental amalgam Q16: Match the items with the correct description: Corrosion: Deterioration of the metal due to moisture and acid present in the oral cavity Tarnish: Discoloration due to oxidation of the metal's surface Galvanism: Electrical current between two dissimilar metals Thermal conductivity: The rate at which heat flows through a material
Q24: Which material listed would show the lowest level of solubility? A24: Porcelain Q25: Of the three types of forces, which is most concerned with the stretching of a material? A25: Tensile force Q26: _____ refers to the intensity or strength of the color. A26: Chroma Q27: What could excessive expansion of a restorative material result in? A27: Fracture of cusps Q28: Normal masticatory forces on the occlusal surfaces of molar teeth can increase to as much as _____ pounds per square inch on a cusp tip. A28: 28, Q29: The color range of a tooth is usually seen by the human eye as yellow or brown. What is this component classified as? A29: Hue Q30: Why is the coefficient of thermal expansion significant in dental materials? A30: It measures the change in volume or length of a restoration. Q31: Torque is a combination of which forces? A31: Compressive and tensile
Q32: Which of the following restorative materials has a coefficient of thermal expansion and thermal conductivity closest to enamel? A32: Porcelain Q33: Dental plaster begins with ____ components. A33: Water and powder Q34: Which of the following is an example of a secondary rather than primary bond? A34: Hydrogen bond Q35: _____ time is the time permitted to manipulate the material in the mouth. A35: Working Q36: Metals that can withstand dimensional change without breaking are: A36: Ductile Q37: A _____ material will flow more easily under mechanical pressure. A37: Thixotropic Q38: Which of the following is true concerning initial and final setting times? A38: Moisture and pressure controls are frequently important during the initial set. Q39: In general, _____ temperature and _____ humidity will accelerate the reaction of the material. A39: High; high
Q47: Through which medium is dust generated and inhaled? A47: Particulate matter Q48: If eyes are exposed to acids used during manipulation of various dental materials, how long is it recommended for the exposed individual to use the nearest eye wash station and flush the eyes with water? A48: 15 minutes Q49: Which of the following is essential to prevent severe injury if phosphoric, hydrofluoric, or hydrochloric acid is splashed on the skin, eyes, or clothing during manipulation of various dental materials? A49: Flushing with water Q50: A hazardous chemical is any substance that what? A50: Is corrosive or toxic, can react or explode when mixed with other substances, and can catch fire. Q51: Which of the following is true for control of a mercury spill? A51: A mask and utility-type gloves should be worn whenever cleaning a mercury spill. Q52: Exposure to chemicals over a prolonged period of time is _____ exposure. A52: Chronic
Flashcard 1 Q: Chemically, gypsum is known as: A: Calcium sulfate dihydrate Flashcard 2 Q: High strength dental stone is produced by boiling gypsum in a 30% solution of: A: Calcium chloride Flashcard 3 Q: The water/powder ratio for unimproved dental stone would be: A: 32/ Flashcard 4 Q: A dental assistant would most likely use _________ to construct a cast for fabricating a mouth guard or a bleaching tray. A: Unimproved dental stone Flashcard 5 Q: Calcination is: A: The process of converting mined gypsum into a fine powder Flashcard 6 Q: An assistant can clinically note __________ by the "loss of gloss" in the mix. A: Initial set of the mix Flashcard 7 Q: Air may be produced in the mixture by: (select all that apply) A: Rapidly whipping the mix A: Adding powder too rapidly
Flashcard 14 Q: The chemical reaction that occurs after plaster or stone has been mixed with water is called: A: Exothermic reaction Flashcard 15 Q: Slump test refers to: A: Measuring of mix consistency Flashcard 16 Q: Which of the following would retard the setting time of gypsum? A: Borax Flashcard 17 Q: Which of the following would be considered an accelerator in the setting of gypsum? (select all that apply) A: Slurry water A: Potassium sulfate Flashcard 18 Q: When the maxillary and mandibular models are trimmed and in occlusion, their overall height should be approximately: A: 2 1/2 inches Flashcard 19 Q: Which type of expansion do you get when water is absorbed from the air? A: Hygroscopic Flashcard 20 Q: A "die" would be: A: A working model of a tooth or teeth that can be removed from the main model to construct a crown or bridge.
Flashcard 21 Q: A gypsum material that is classified as type III would be: A: Unimproved dental stone Flashcard 22 Q: A diagnostic cast is primarily used: A: As a guide to determine necessary treatment Flashcard 23 Q: To assure a complete set of the gypsum product, it is recommended that the study model harden for _________ before separating the impression from the model. A: 45-60 minutes Flashcard 24 Q: When changing the water/powder ratio we compromise the: A: Both the strength and abrasive resistance Flashcard 25 Q: The anatomical portion of your model should be: A: 2/3 of its height Flashcard 26 Q: Which of the following statements is true: A: Because high-strength/high expansion stone is mixed with the least amount of excess water, it is the strongest of the gypsum materials Flashcard 27 Q: A chemical modifier which is added to a gypsum product to shorten the setting time is: A: Accelerator
Flashcard 36 Q: The anterior cuts on the maxillary model should be approximately ________ degrees. A: 25- Flashcard 37 Q: The heels of both models are ____ inch in length. A: 1/ Flashcard 38 Q: Paraffin waxes are obtained primarily from: A: Minerals Flashcard 39 Q: Carnauba wax is derived from: A: Plant Flashcard 40 Q: Beeswax is derived from: A: Insects Flashcard 41 Q: A pattern wax might be used to: A: Form the general size and contour of a restoration Flashcard 42 Q: ________ wax is hard and brittle. It is heated to form the initial base in processing dentures. A: Baseplate wax
Flashcard 43 Q: To reduce residual stress, one can: A: Soften the wax uniformly for 15 minutes before using Flashcard 44 Q: The wax most often used to prepare a partial denture framework is: A: Casting wax Flashcard 45 Q: The flow characteristic relies on what property? A: Temperature Flashcard 46 Q: This wax can help hold a broken denture together while the dental auxiliary repairs it. A: Sticky wax Flashcard 47 Q: The wax most often used to form a box around an edentulous impression is: A: Boxing wax Flashcard 48 Q: If it is necessary to store a wax pattern or bite registration, it should be stored: A: In a cool, dry place Flashcard 49 Q: A wax pattern is invested and burned out in the lost wax procedure. Which property of the inlay wax is most important? A: Excess residue
