Dental material handling, impression taking, and four-handed chairside technique concepts for dental assistants.
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- What is the primary goal of four-handed chairside technique?
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Maximize efficiency and productivity by allowing the dentist to focus on treatment while the assistant manages the field, instruments, and materials.- In four-handed technique, where should the dental assistant be positioned relative to the dentist?
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At the 9 o'clock position for a right-handed dentist, seated slightly higher than the patient's mouth.- What is the term for working in the same visual field as the dentist in four-handed technique?
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Operating zone or treatment zone, typically the area directly above the patient's mouth.- What is an impression in dentistry?
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A negative reproduction of the teeth and tissues used to make a positive model for fabricating restorations.- Name three common impression materials used in dentistry.
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Alginate, polyether, and addition silicone (putty and light body).- What is the most common impression material for preliminary impressions?
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Alginate, because it is quick-setting, inexpensive, and comfortable for the patient.- How long does alginate typically set after mixing?
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Two to three minutes, depending on the powder-to-water ratio and room temperature.- What does PVS stand for in impression materials?
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Polyvinyl siloxane, a synthetic rubber impression material also called addition silicone.- Why is polyether impression material preferred for crown and bridge impressions?
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It is dimensionally stable, hydrophilic, and provides excellent detail and accuracy.- What is the purpose of a tray in impression taking?
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To hold and shape the impression material and carry it into the patient's mouth.- What is the difference between a custom tray and a stock tray?
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A stock tray is pre-made in various sizes, while a custom tray is individually fabricated to fit a specific patient.- What is the primary purpose of a dental base or foundation cement?
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To protect the pulp and provide thermal and electrical insulation under a restoration.- Name three types of dental cements used in restorative dentistry.
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Glass ionomer, zinc oxide eugenol, polycarboxylate, and resin-modified glass ionomer.- What is zinc oxide eugenol (ZOE) cement primarily used for?
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Temporary restorations, bases, and temporary cements due to its soothing effect on the pulp.- What is the setting time for composite resin restorations?
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Depends on the curing method: light-cured sets in 20 to 60 seconds with a curing light.
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