Some dental materials may be therapeutic in small quantities or if in contact with tissues for a short period of time. Dental materials may be irritating or toxic with longer or larger doses., Both statements are true., Both statements are false., The first statement is true, and the second statement is false., The first statement is false, and the second statement is true., Normal masticatory forces on the occlusal surfaces of molar teeth can increase to as much as _____ pounds per square inch on a cusp tip, 280, 1000, 10,000, 28,000, _____ force is applied when two surfaces slide against each other in opposite directions., Compressive, Shearing, Tensile, Axial, Stress is the amount of force exerted from within an object, and _____ is the amount of change that the force has produced, strain, tension, compression, chemical bonding, How much force do denture wearers apply as compared to individuals with intact dentitions?, 40%, 50%, 60%, 70%, Which of the following statements is correct about fatigue failure?, It is not a factor for restorative dental materials., It is not dependent on conditions in the oral cavity., It occurs as the result of a large, single-force application., It occurs as the result of microscopic flaws that grow over time., How does force exerted over a large area compare to force exerted over a small area when the same force is applied to each?, Deformation is greater in a small area than in a large area., Compression on objects in the large area are shortened more than in the small area., There is little difference in outcome whether the area is large or small., It will depend on how poorly the force is dissipated over each area., The staining of resins and acrylics from repeated exposure to coffee, tea, and other dyed beverages is due to:, compressive forces., water sorption., galvanism., tarnish., Which of the following dental restorative materials is particularly susceptible to corrosion?, Acrylic, Dental porcelain, Dental amalgam, Composite resin, Which of the following has been suggested to delay formation of surface tarnish on dental amalgams?, Polishing, Undercondensation, Incremental addition, Use of low-copper amalgam, Which of the following is true of galvanism?, It is an electrical current transmitted between two similar metals., It is observed in patients with composite resin but not silver amalgam restorations., Galvanic stimulation will decrease with time as oxides form on the surface of the metal., The salts of the saliva inhibit the movement of electrical current from one type of metal to another., What could excessive expansion of a restorative material result in?, Corrosion, Galvanism, Fracture of cusps, Leakage of fluid and bacteria into the gaps, What is percolation?, The rate at which heat flows through a material, A form of chemical rather than mechanical retention, Something that helps seal the interface between tooth and restorative material, Something that allows the ingress of bacteria and oral fluids and may lead to recurrent caries, staining, and pulpal irritation, Mechanical retention is the result of adhesion whereas chemical retention uses undercuts for retention. When significant tooth structure is lost, undercuts are no longer effective for retention., Both statements are current., Neither statement is correct., Statement 1 is correct; statement 2 is incorrect., Statement 1 is incorrect; statement 2 is correct., Which of the following restorative materials has a coefficient of thermal expansion and thermal conductivity closest to enamel?, Gold, Amalgam, Porcelain, Composite resin, The technique of chemical bonding rather than mechanical means to produce retention requires _____ removal of tooth structure and produces a _____ retentive force between tooth and restoration., more; stronger, more; weaker, less; stronger, less; weaker, Which of the following statements is true for the property of wetting as related to dental materials?, The Teflon surface of cooking equipment has good wetting., A thin film of dental cement is desirable to cement crowns., Liquids generally spread better over low surface energy surfaces., A surface has high surface energy when liquids bead up on the surface., Microleakage into the interface between tooth structure and restorative material is responsible for much of the _____ observed following tooth restoration. 1. recurrent decay 2. marginal staining 3. postoperative sensitivity 4. tarnish, 1, 2, 3, 4, 1, 2, 3, 2, 3, 4, 1, 2, _____ refers to the intensity or strength of the color., Hue, Value, Chroma, Opacity, Which of the following is considered to be the most reliable means of clinical assessment of composite and glass ionomer restorations?, The patient history, Evaluation of radiographs, Use of the air-water syringe, Tactile evaluation of the tooth surface, Which of the 700 microorganisms in the oral cavity are most prevalent?, Fungi, Viruses, Bacteria, Protozoa, Constant bending of a metal wire weakens the wire by compression on the inside surface and tension on the outside surface until the wire breaks. Which type of force has occurred?, Stress, Strain, Tension, Flexure, When an object cannot resist force, _____ occurs, deformation, distortion, deformation and distortion, Torque is a combination of which forces?, Compressive and tensile, Compressive and torsion, Shearing and tensile, Shearing and compressive, Which material listed would show the lowest level of solubility?, Amalgam, Composite resin, Porcelain, Cement, Acidulated topical fluorides can have a negative effect on certain dental materials. Many of today’s dental materials are made to be moisture resistant., Both statements are correct., Neither statement is correct., Statement 1 is correct; statement 2 is incorrect., Statement 1 is incorrect; statement 2 is correct., Contact between two dissimilar metals in the mouth may result in what reaction?, Galvanic shock, Metallic taste, Electrical current, All of the above are possible., Why is the coefficient of thermal expansion significant in dental materials?, It measures the change in volume and length of a restoration., It measures the amount of percolation of the restoration interface., It measures the change in oral temperature related to foods ingested., It measures the amount of stress and strain placed on the restoration., Which of the following is not a good conductor of temperature?, Gold crown, Amalgam restoration, Composite resin restoration, Some materials give off heat when mixed. What is this called?, Chemical reaction, Exothermic reaction, Thermal conductivity, Coefficient of thermal expansion, What causes microleakage?, A poorly placed restoration, A fracture within a restoration, Expansion and contraction of a restoration, All of the above could cause microleakage., Adhesion is the method of _____ retention., chemical, mechanical, dual, The color range of a tooth is usually seen by the human eye as yellow or brown. What is this component classified as?, Hue, Value, Chroma, Which of the following is a concern regarding identification of dental materials in the mouth and why is it important?, Therapeutic agents could erode some materials., Scaling could damage the surfaces of some materials., Both are concerns when materials are identified., What is the thermal conductivity of composite resin?, Similar to tooth structure, Lower than tooth structure, Similar to metal restorations, Does not conduct temperature.

Chapter 2 - MC

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