Dental organic matrix

The dental organic matrix is a complex assembly of proteins, proteoglycans, and lipids that orchestrates the biomineralization and structural integrity of enamel and dentin (George & Veis, 2008). In enamel, the matrix is transient and primarily composed of amelogenins (90%), enamelins, and ameloblastins, which facilitate the organized growth of hydroxyapatite crystals before being largely removed during maturation (Gil-Bona & Bidlack, 2020). Recent studies have also identified the presence of keratins, such as KRT75, which contribute to enamel's mechanical properties and resistance to caries (Duverger et al., 2014). Dentin's organic matrix is permanent and consists of approximately 90% Type I collagen, providing a scaffold for mineral deposition regulated by non-collagenous proteins like dentin sialophosphoprotein (DSPP) and dentin matrix protein 1 (DMP1) (George & Veis, 2008). Pathological degradation of these molecules by host-derived matrix metalloproteinases (MMPs) is a key factor in dental caries and the failure of adhesive restorations (Tjäderhane et al., 2013). Therapeutic strategies include the use of enamel matrix derivatives for periodontal regeneration and MMP inhibitors like chlorhexidine to preserve the dentin-adhesive interface (Miron et al., 2016; Tjäderhane et al., 2013).

Other names

Organic molecules in tooth enamel and dentinTooth organic matrixEnamel organic matrixDentin organic matrixDental extracellular matrixTooth proteins

Therapeutic agents interact with the dental organic matrix through several mechanisms: matrix metalloproteinase (MMP) inhibition to prevent the degradation of collagen fibrils (e.g., chlorhexidine, doxycycline), biomimetic mineralization where protein analogs or peptides nucleate hydroxyapatite crystals (e.g., enamel matrix derivative, P11-4), and chemical cross-linking to stabilize the collagen scaffold and improve the durability of dental bonds (e.g., glutaraldehyde, carbodiimide) (Tjäderhane et al., 2013; Miron et al., 2016).