2. Root: the part of the tooth below the neck and buried in the alveolar bone. It is also the supporting part of teeth, and its shape and number change with function and change. The front teeth are mainly used to cut food, so they are single, and the molars undertake the main chewing function. The root bifurcates into 2 ~ 3 roots to enhance its stability.
3. Neck: The joint between the crown and the root of the tooth shows an arc curve, which is called the neck of the tooth, also known as the neckline or neck curve.
Extended data:
The normal dentition of healthy adults contains 32 permanent teeth, which are divided into four areas: upper, lower, left and right. According to the shape and function of teeth, they are divided into incisors, bicuspids (premolars) and molars, with *** 16 pairs. The left and right teeth with the same name have the same anatomical shape.
Located in the middle of bicuspid teeth. The most important functional teeth in the oral cavity, especially the first molar (six-year-old teeth), are also the most prone to dental caries. Premature molar defect will lead to the decline of masticatory function, even affect temporomandibular joint, resulting in abnormal facial development, occlusal pain and other symptoms. The impacted third molar (wisdom tooth) often leads to pericoronal abscess, dental caries of the second molar and other consequences, which should be treated as soon as possible.