Abstract
Tooth enamel is composed of well-crystallized apatite that elongates in the c-axis direction with a highly organized orientation. How do these crystals form? It is still an unanswered question, despite enormous efforts made on answering it.
Chapter 5 briefly reviews the physicochemical studies on clarifying the mechanism of enamel apatite formation. These studies revealed that enamel apatite crystals are formed in a fluid with discrete inorganic and organic compositions. The activity of inorganic ions changes dynamically during the formation process under strict cellular control, and it provides an adequate driving force for nucleation and successive growth. These processes include a dynamic equilibrium of inorganic ions and a transition of unstable intermediates to more stable phases. The composition and solubility of the forming enamel crystals also change dynamically. Because of this complex situation, several formation mechanisms of enamel apatite crystals have been proposed, and researchers have yet to reach a consensus on the subject. Crystal formation takes place in a gel-like enamel matrix, composed of spherical aggregates of amelogenin molecules. Amelogenin is a major component of the enamel matrix and regulates crystal formation by cooperating with enameline (minor matrix protein) and inorganic fluid components. Once enamel formation is initiated, these proteins are degraded into smaller fractions, change the interaction with forming crystals and inorganic ions, and are gradually removed from the matrix, providing space for enamel crystals to grow. The chapter ends with a discussion of unique hard tissues with unusual mineral phases in vertebrate and invertebrates.
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Iijima, M., Onuma, K., Tsuji, T. (2012). Biomineralization: Tooth Enamel Formation. In: Liu, X. (eds) Bioinspiration. Biological and Medical Physics, Biomedical Engineering. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5372-7_5
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