According to Moh’s scale of hardness, fluoride is harder than quartz. True or false?
(A.) True
(B.) False
Mini Boards Reviews for the National + Local Anesthesia Dental Hygiene Boards
Answer: (B.) False
Moh’s scale of hardness compares minerals and their relative ability to scratch another mineral. From hardest to softest:
- Diamond
- Corundum
- Topaz
- Quartz
- Orthoclase
- Apatite
- Fluorite
- Calcite
- Gypsum
- Talc
Therefore, fluoride is softer than quartz.
Diamond is used in dentistry as an abrasive. Other types of abrasives include (from the hardest to the softest): tungsten carbide, aluminum oxide, zirconium silicate, quartz, tin oxide, pumice, chalk, gypsum, and talc.
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