Hydroxyapatite (Tooth Enamel and Dentin Mineral) (HAp)

Tooth enamel and dentin mineral surfaces are primarily composed of hydroxyapatite [Ca10(PO4)6(OH)2], a crystalline calcium phosphate that provides the structural hardness required for mastication (StatPearls, 2023). These surfaces are dynamic environments that undergo continuous cycles of demineralization and remineralization influenced by oral pH and ion availability (NIH, 2021). In the context of dental caries, bacterial acids dissolve the mineral matrix, while therapeutic agents like fluoride target the surface to catalyze the formation of fluorapatite, which is significantly more resistant to acid dissolution (CDC, 2023). Dentin surfaces also contain microscopic tubules that, when exposed due to enamel loss or gingival recession, can lead to hypersensitivity; treatments often involve the application of minerals to occlude these tubules and reduce hydrodynamic flow (Journal of Clinical Periodontology, 2013). Understanding the physicochemical properties of these mineral surfaces is essential for developing restorative materials and preventive therapies in oral health (Nature BDJ, 2019).

Other names

Dental hydroxyapatiteCarbonated hydroxyapatiteTooth mineral surfaceCalcium hydroxyapatiteEnamel mineralDentin mineral

Therapeutic agents interact with the mineral surface by promoting remineralization through the deposition of calcium and phosphate ions, or by converting hydroxyapatite into fluorapatite, which is more resistant to acid dissolution. In dentin, agents work by physically occluding exposed dentinal tubules to prevent hydrodynamic fluid movement that triggers pain.