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?
- 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?
- 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?
- Operating zone or treatment zone, typically the area directly above the patient's mouth.
- What is an impression in dentistry?
- 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.
- Alginate, polyether, and addition silicone (putty and light body).
- What is the most common impression material for preliminary impressions?
- Alginate, because it is quick-setting, inexpensive, and comfortable for the patient.
- How long does alginate typically set after mixing?
- Two to three minutes, depending on the powder-to-water ratio and room temperature.
- What does PVS stand for in impression materials?
- Polyvinyl siloxane, a synthetic rubber impression material also called addition silicone.
- Why is polyether impression material preferred for crown and bridge impressions?
- It is dimensionally stable, hydrophilic, and provides excellent detail and accuracy.
- What is the purpose of a tray in impression taking?
- 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?
- 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?
- To protect the pulp and provide thermal and electrical insulation under a restoration.
- Name three types of dental cements used in restorative dentistry.
- Glass ionomer, zinc oxide eugenol, polycarboxylate, and resin-modified glass ionomer.
- What is zinc oxide eugenol (ZOE) cement primarily used for?
- Temporary restorations, bases, and temporary cements due to its soothing effect on the pulp.
- What is the setting time for composite resin restorations?
- Depends on the curing method: light-cured sets in 20 to 60 seconds with a curing light.