系统综述背景 口腔正畸学关注的是颌骨和面部的生长、牙齿的发育以及牙齿和颌骨咬合的方式。理想情况下，下前牙咬合在上前牙后表面的中间。当下前牙比理想情况下上前牙咬得更远时，这被称为II类咬合畸形。II类2分类咬合畸形的特征是上前牙舌倾（向口腔上颚倾斜）和过度咬合（前牙垂直重叠 ...

Teeth are the hardest thing in the human body. They are not made of bone. They are made of enamel, gum and so on. People use teeth when they eat something or tear something. How many teeth do ...