D2L Quiz: Dental Materials Chapter 12

The Brinell Scale ranks materials by their relative resistance to abrasion (T or F)

False; Mohs' Hardness Scale rates materials by their abrasion resistance

Composites are usually polished using disks and rubber cup impregnated with fine pumice.

False; the cup itself does not contain pumice we add that to the cup for example using prophy paste.

Aluminum Oxide is an extremely fine abrasive used for final polishing on enamel and restorations (T or F)

False; used in sandblasting a restoration in preparation for cementation and air abrasion, comes in several grits used to smooth enamel or to finish metal alloys and ceramic materials.

Prophylaxis toothpaste differs from over-the-counter toothpaste in that a. it is less abrasive b. it is more abrasive c. it may contain fluoride d. there is little difference

It is more abrasive

Some of the fluoride rich layer of enamel is removed during ______ ___ _________.

Rubber Cup Polishing

A natural abrasive composed of quartz and silica is ______.

Sand

A synthetic material that produces an extremely hard and efficient abrasive material is ______ _______.

Silicon Carbide

Plastic Sheaths and Ultrasonic Scalers maybe used to remove biofilm without abrading the surface of the implant (T or F)

True

The benefits of a properly finished and polished restoration include deceased biofilm retention and increased resistance to tarnish and corrosion (T or F)

True

The larger the abrasive materials the more effective the of the surface is (T or F)

True