Zahnhartgewebe

Zahnhartgewebe refers to the hard tissues that form the structure of a tooth. These tissues are primarily responsible for the tooth's strength and function in mastication. The main types of Zahnhartgewebe are enamel, dentin, and cementum.

Enamel is the outermost layer of the tooth crown. It is the hardest substance in the human body, primarily composed of hydroxyapatite crystals. Enamel's primary function is to protect the underlying dentin and pulp from wear and tear, as well as from chemical and thermal stimuli. It is acellular, meaning it does not contain living cells and therefore cannot regenerate once formed.

Dentin forms the bulk of the tooth's structure, lying beneath the enamel and cementum. It is less hard than enamel but still a strong calcified tissue. Dentin is formed by odontoblasts, which are cells located in the pulp chamber. Dentin contains microscopic tubules that extend from the pulp to the enamel or cementum, which help transmit sensory information and nutrients. It plays a role in the tooth's sensitivity.

Cementum is a specialized bone-like tissue that covers the root of the tooth. It is less calcified than dentin and enamel. Cementum's main function is to provide an attachment surface for the periodontal ligaments, which hold the tooth in its socket. It can be repaired and laid down throughout life, although to a limited extent. Together, these hard tissues form the functional unit of the tooth.