Teeth are important chewing organs in the human body and have different morphologies and functions, so they can be classified according to different criteria. Here are a few common ways to classify teeth:
1. Classification according to function.
1.Incisors: Located in the front of the mouth, their main function is to cut food, with a flat shape and thick roots. The incisors are divided into central and lateral incisors, usually 4 in the upper and lower jaws.
2.Fangs: Located at the corners of the mouth, their main function is to puncture and tear food. The roots are long and stout, the teeth are sharp, and the crown has a raised cusp on the labial surface. The canines usually have 4 in the upper and lower jaws.
3.Premolars: Located between the canines and molars, they are also known as bicuspids. The main function is to assist the fangs in tearing food and to help the teeth grind and grind the food. The crown of the premolars is large, cuboid in shape, with a distinct developmental groove on the surface. Premolars usually have 8 upper and lower jaws.
4.Molars: Located at the back of the mouth, they are also known as molars. The main function is to grind food to make it easy to swallow and digest. Molars have the largest crowns and are cubic or nearly cube-shaped, with developmental grooves on the surface. Molars usually have 6 molars in the upper and lower jaws, and the third molars are also known as wisdom teeth.
2. Classification according to morphology.
1.Normal teeth: Teeth are aligned and morphologically normal, with no missing or impacted teeth.
2.Misaligned teeth: Misaligned or abnormally positioned teeth, including crowded teeth, sparse teeth, twisted teeth, etc.
3.Missing teeth: Missing teeth due to various reasons can be divided into congenital and acquired missing. Congenital absence refers to the absence of teeth at birth, and acquired absence refers to the loss or extraction of teeth due to illness, trauma, etc.
4.Impacted teeth: Teeth that do not erupt properly due to insufficient bone mass in the jaw or abnormal tooth growth direction, usually seen in wisdom teeth.
Through the above classification methods, teeth can be described and classified in detail, helping us to better understand the structure and function of teeth, and providing protection for oral health. At the same time, for abnormal conditions such as misaligned teeth, missing teeth and impacted teeth, oral ** and correction are required in time to restore the normal function and aesthetics of the teeth.