DANB CDA Dental Instruments and Equipment Flashcards

What is the function of an amalgam carrier?

Answer: To transport and dispense amalgam into the cavity

An amalgam carrier is a syringe-like instrument used to pick up freshly mixed amalgam and dispense it directly into the prepared cavity.

Which type of matrix system is most commonly used for posterior composite restorations?

Answer: Sectional matrix system

Sectional matrix systems (such as the Composi-Tight) are preferred for posterior composites because they create tight interproximal contacts and proper contours.

The air-water syringe in a dental unit delivers which combination?

Answer: Air, water, or a combination spray

The air-water syringe (three-way syringe) can deliver air alone, water alone, or a combined air-water spray for rinsing and drying the operative field.

What is the purpose of a dental dam clamp?

Answer: To anchor the dental dam to the anchor tooth

A dental dam clamp (retainer) is placed on the anchor tooth (usually the most posterior tooth in the treatment area) to secure the dental dam in position.

Which handpiece operates at speeds above 100,000 RPM?

Answer: High-speed (turbine) handpiece

The high-speed air turbine handpiece operates between 250,000–400,000 RPM and is used for cutting enamel, dentin, and removing old restorations.

What is the purpose of an explorer in a dental examination?

Answer: To detect decay, calculus, and surface irregularities by tactile feel

An explorer's sharp, thin tip allows the clinician to tactilely detect carious lesions, calculus deposits, overhanging margins, and surface defects.