layer also reduces the energy transferred across both layers due to the large difference in modulus, even reflecting some of the incident energy.

Use in medicine

Dentistry

, the use of hydroxyapatite, or its synthetically manufactured form, nano-hydroxyapatite, is not yet common practice. Some studies suggest it is useful in counteracting dentine hypersensitivity, preventing sensitivity after teeth bleaching procedures and cavity prevention. Avian eggshell hydroxyapatite

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