An example of an ionic bond in dentistry is:

Question

BlackTom AI · Accepted Answer

In this question, we’re asked to identify an example of an ionic bond in dentistry.
Option 1: hydroxyapatite. This compound is the mineral form of calcium phosphate that makes up the mineral phase of teeth and bone. In its crystal lattice, calcium ions (Ca2+) are bound to phosphate groups (PO4)3− and hydroxide ions through ionic interactions, which is characteristic of an ionic bond network. This option correctly represents ionic-bonding in dental hard tissue.
Option 2: enamel. Enamel is the highly mineralized outer layer of teeth whose structure is dominated by hydroxyapatite crystals, but the statement describes enamel as a material rather than the specific ionic bonds within its crystal lattice. While enamel contains ionic bonds as part of its crystal structure, the option names a substance/structure rather than the specific ionic-bond interaction itself, making it a less precise example of an ionic bond.
Option 3: anesthetic. Dental anesthetics are typically organic molecules bonded covalently to other atoms, not primarily through ionic bonds. The primary bonding in many anesthetics is covalent (and sometimes hydrogen bonding or ionic character in certain salts), but as a general class, this option does not exemplify an Ionic bond in dentistry.
Option 4: nitrous oxide. Nitrous oxide (N2O) is a diatomic molecule with covalent bonds between nitrogen and oxygen atoms. It does not illustrate ionic bonding, so this is not an appropriate example of an ionic bond in dentistry.
Overall, the explanation hinges on recognizing that hydroxyapatite’s solid dental mineral contains ionic interactions within its crystal lattice, whereas the other options refer either to a structure or to bonds that are covalent rather than ionic.

An example of an ionic bond in dentistry is:

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