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Dental Materials 164

unit 1 PIMA

QuestionAnswer
Corrosion The roughness and pitting of a metal alloy due to chemical attack, contamination,etc
Wetting The ability of the liquid to flow easily over the surface and to come into contact with all small roughnesses present.
Ductility The ability of a material to withstand permanent deformation under a tensile load without rupture.
Malleability The ability of a material to withstand permanent deformation under compressive load without rupture.
Linear Coefficient of Thermal Expansion The increase in length of a material, per unit length, when the temperature is increased 1° Centigrade.
Adhesion The force which causes attraction between unlike molecules.
Exothermic A chemical reaction that gives off (releases) heat.
Soluble Able to dissolve influence.
Microleakage When fluids, microorganisms, and debris from the mouth penetrate the outer margin of the restoration and progress down the walls of the cavity preparation.
Mechanical Retention How a material is held in place by means such as the shape of the cavity preparation, etching the surface, or placing retentive grooves.
Brittleness The property of being easy to break or rupture.
Force Any push or pull on matter.
Galvanism Small currents created whenever two metals are present in the oral cavity.
Hardness The resistance of a material to indentation or penetration.
Physical condition of the oral cavity which need consideration when a restoration is being placed include: The acidity (pH) in the mouth, which may cause metallic restorations to tarnish or corrode and nonmetallic restorations to deteriorate. Themperature fluctuations. Biting forces during mastication.
TRUE A liquid that does not flow easily and is the consistency of a thick or heavy syrup. A high viscous adhesive will not flow easily and will not be as effective in wetting a surface as would an adhesive of lower viscosity.
The color blue on the chemical warning lable indicates... Health hazard
TorF? The National Fire Protection Association's color and number method is used on chemical warning labels. True
TorF? The higher is number the greater the danger (for red, blue, and yellow) True
TorF? The color red identifies the fire hazard True
TorF? Letters are used to identify the PPE needed True
TorF? The color white identifies the PPE needed True
Which federal agency is concerned with the health and safty of employees? OSHA
What is MSDS? Data that contains safe handling, disposal, and precautions of materials.
The ________ regulates the disposal of hazardous waste... EPA
TorF? When a hazardous chemical is placed in a separate container for use on another day, it must be labeled with a copy of the original label or a new label... True
Inspections of dental facilities relating to workers safety are conducted by... OSHA
A dentist must provide training for employees.. 4 answers Within 30 days of employment. Whenever a new hazardous material is introduced into the workplace. Whenever procedures for safe handling and emergencies are modified. Once per year.
Safety glasses, gloves, and face masks are examples of... PPE
Created by: Urania on 2012-01-12



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