Q: According to Moh’s scale of hardness, fluoride is harder than quartz. True or false?
dental material, moh's scale of hardness, dental hygiene exam prep

Q: According to Moh’s scale of hardness, fluoride is harder than quartz. True or false?

According to Moh’s scale of hardness, fluoride is harder than quartz. True or false?

(A.) True
(B.) False

dental material, moh's scale of hardness, dental hygiene exam prep
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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Written by
Claire Jeong, RDH, MS

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