1. What is the composition of a tooth? 2. What is the term used to describe the area where the crown and root meet? 3

Composition of a tooth:
The tooth is composed of several different layers. The outermost layer is the enamel, which is the hardest substance in the human body. It protects the tooth from decay and damage caused by chewing. Underneath the enamel is the dentin, which is less hard than enamel but still quite durable. Dentin makes up the majority of the tooth structure. The innermost layer of the tooth is the pulp, which contains nerves, blood vessels, and connective tissue. The pulp provides nutrients to the tooth and is responsible for sensing pain or temperature changes.

Term for the area where the crown and root meet:
The area where the crown and root of a tooth meet is called the cementoenamel junction (CEJ). This junction is located slightly below the gumline and can be seen when the gum tissue is pulled back.

Makeup of each individual tooth:
Each tooth consists of three main parts: the crown, the neck, and the root. The crown is the visible part of the tooth above the gumline, while the neck is the narrow area that connects the crown to the root. The root is embedded in the jawbone and holds the tooth in place.

Enamel:
Enamel is the outermost layer of the tooth and is composed mainly of minerals, primarily hydroxyapatite crystals. It is highly mineralized and acts as a protective barrier for the underlying layers of the tooth. Enamel does not contain living cells and cannot regenerate once it is damaged or lost.

Intersection of cementum and enamel:
Cementum, another hard tissue, covers the tooth root and helps anchor it to the jawbone. It meets the enamel at the cementoenamel junction (CEJ), which is slightly below the gumline.

Definition of cementum:
Cementum is a hard, bonelike tissue that covers the root of the tooth. It helps to anchor the tooth to the surrounding bone by providing a surface for the attachment of the fibers of the periodontal ligament.

Dentin sensitivity to pain:
While dentin itself does not have sensitivity to pain, it is innervated by nerve fibers that pass through microscopic tubules. When the dentin becomes exposed, either due to tooth decay or gum recession, stimuli such as hot, cold, or sweet foods can reach the nerves, causing tooth sensitivity or pain.

Contents of the pulp:
The pulp contains blood vessels, nerves, and connective tissue. It supplies the tooth with nutrients and is responsible for transmitting sensory information such as pain or temperature changes.

Supporting structures of the tooth:
The tooth is supported by several structures. The periodontal ligament surrounds the root of the tooth and attaches it to the surrounding bone. The alveolar bone, also known as the tooth socket, holds the tooth in place. The gums or gingiva surround the base of the tooth, providing protection and support.

Пример:
Identify the different layers of a tooth and explain their functions.

Совет:
To understand the composition of a tooth, it can be helpful to study diagrams or models that illustrate the different layers. Additionally, learning key terms such as enamel, dentin, and pulp will aid in comprehension.

Задание для закрепления:
What is the term used to describe the outermost layer of the tooth?