Fundamentals of Dental Materials and Oral Health

1. Resistance to flow is known as curing density film thickness viscosity 2. Oral biofilm is is a complex organization of microorganisms on oral surfaces and restorations considered normal or healthy when non-pathogens keep harmful microbes in balance. a slick film of mucus that develops on surfaces within the mouth. composed of bacteria only 3. Which of the following statements is true concerning the American Dental Association (ADA) Seal? The ADA Seal is usually awarded for the life of the product. All dental products qualify for the Seal. It helps consumers make informed decisions about the safety and efficiency of products. Once a product has been accepted, it does not need to be reevaluated if its composition changes. 4. The study of dental materials includes knowledge of All of the above the physical reactions of the material the ways to manipulate the material the chemical reactions of the material 5. Susan has just had an MOD amalgam placed on tooth #30. When biting, this tooth is in contact with a gold crown on tooth #3. Susan complains of an electric shock sensation and a metallic taste. This is most likely due to metamerism galvanism tarnish corrosion 6. The correct term for describing the maximal amount of stress a material can withstand without breaking is ultimate strength ductility elasticity toughness 7. Microleakage may be responsible for postoperative sensitivity recurrent decay all of the above marginal staining 8. The leakage of fluids and debris extending along the tooth-restoration interface is called Trituration Microleakage Deformation Metamerism 9. Color shades can vary depending on the incident light or source of light. This effect is called Metamerism Spectrum Meniscus Chroma 10. Colonies of bacteria growing on the teeth are called Dental plaque Principle invaders Parasites Primary intruders 11. Material subject to repeated stresses such as in mastication may be subject to fracture due to flexural stress force exerted over a large area fatigue failure forces stretching an object 12. Which of the following is not a classification of dental materials? restorative biological therapeutic preventive 13. The proper PPE to be worn during handling of dental materials that can generate particulate matter consists of: safety glasses, lab coat or over gown, surgical or special dust mask safety glasses, surgical or special dust mask, heavy-duty utility gloves, and over gloves safety glasses, lab coat or over gown, surgical or special dust mask, and heavy-duty utility gloves lab coat or over gown, surgical or special dust mask, heavy-duty utility gloves, and vinyl examination gloves 14. When one is working with dental materials, the most common work-related health and safety hazards are: exposure to particulate matter, exposure to biological contaminants, exposure to perfume, and exposure to airborne contaminants exposure to mercury, exposure to particulate matter, exposure to perfume, and exposure to airborne contaminants exposure to particulate matter, exposure to biological contaminants, exposure to noise, exposure to perfume, and exposure to airborne contaminants exposure to mercury, exposure to particulate matter, exposure to biological contaminants, and exposure to toxic effects of chemicals 15. Since 2005, the American Dental Association (ADA) Seal of Acceptance is awarded to _____ products. professional but not consumer neither professional nor consumer consumer but not professional both professional and consumer 1. Disinfection solutions need to have the following qualities. must be safe to use be on the EPA N List all of the choices destroy/inactivate COVID & Tuberculosis virus none of the choices 2. Which of the following impression materials can not be poured multiple times? polyvinyl siloxane (PVS) alginate addition silicone condensation silicone 3. what are the advantages of digital impressions? all of the choices are correct Creates pre- and post-operative models Are more accurate than conventional impressions Corrections can be made on the screen prior to sending to the lab. Adjustments can be made virtually 4. Which of the following is not true for hydrocolloids in dentistry? Agar hydrocolloid is not a reversible hydrocolloid Agar hydrocolloid requires the use of any impression trays. When agar powder is mixed with water, it forms a glue-like suspension that entraps the water, making a colloidal suspension called a gel. The main clinical use of reversible hydrocolloid is for impressions for diagnostic casts. 5. Which statement is correct regarding alginate hydrocolloid? Adjusting the powder-to-water ratio is the best way to lengthen or shorten the setting time. Alginate hydrocolloid should be removed slowly to prevent deformation of critical surfaces. Some moisture will be lost from the impression even in 100% humidity. Detail is sufficient for indirect restoration final impressions. 6. Which of the following is true of polyether’s? It can tolerate a little moisture around the preparation They are hydrophobic. It is available in three viscosities: light, monophase, and heavy. Cannot displace moisture on the tooth It flows well but has low tear strength. 7. If an alginate impression is left exposed to the air the water content of the impression will evaporate, causing the impression to shrink. This process is called _______________________________. syneresis hysteresis dehydration imbibition 8. If an alginate impression is submerged in a liquid it will absorb the liquid, causing the impression to enlarge/swell. This process is called ____________________________ syneresis dehydration imbibition hysteresis 9. The completed impression forms a _____ reproduction of the teeth and tissues, and the replica or model forms a _____ replica of the teeth and tissues. negative, positive positive, negative negative; negative positive; positive 10. Elastomer impression materials are popular due to their flexibility. True False 11. How long do you disinfect the alginate impression before it can be poured? 5 minutes 20 minutes 15 minutes 10 minutes 12. Ferric Sulfate is sometimes used as an astringent to control bleeding prior to taking an impression. T True F False 13. Which characteristic should be considered when choosing an impression tray? Be rigid to support the impression material Be large enough to fit all oral structures accurately reproduce vestibules All of the choices are considered. 14. Polyvinyl siloxane materials are hydrophobic. Which of the following is not correct about polyvinyl siloxane? Used in a wet field Moisture causes loss of surface detail Contains a wetting agent Cannot displace moisture on the tooth