California Registered Dental Assistant (RDA) Written Practice Exam

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A plastic matrix strip is used to adapt the shape of a tooth for a(an)?

Crown
Bridge
Composite
Denture

The correct answer is: Composite

A plastic matrix strip is used to adapt the shape of a tooth for a composite. A composite is a type of dental filling that is used to restore damaged or decayed teeth. It is composed of a plastic and glass mixture and is bonded to the tooth with an adhesive. Option A, a crown, is a tooth-shaped cap that is placed over a damaged tooth to restore its shape, size, strength, and appearance. Option B, a bridge, is a prosthetic device that is used to replace one or more missing teeth by attaching to adjacent teeth. Option D, a denture, is a removable replacement for missing teeth and surrounding tissues. None of these options involve the use of a plastic matrix strip.