Implant systems are usually classified according to the material, shape and structure, surface structure and connection mode of implants. The clinical practice of oral implantology makes the contemporary oral implant materials and implant morphology tend to be single.
Implants are mainly made of grade 4 commercial pure titanium, and threaded columnar and root implants have become widely accepted implant forms all over the world. Studies have proved that moderately rough surface structure can increase the surface area and bone bonding of implants.
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The main component of a tooth is dentin, which is surrounded by enamel (at the crown) and cementum (at the root). There is also a periodontal membrane composed of fibers outside the cementum to fix the teeth in the alveolar cavity. There is a dental pulp cavity in the center of the tooth, which is filled with dental pulp and rich in blood vessels and nerves.
People have to grow teeth twice in their lives. The first eruption 1 time is called deciduous teeth, with 5 teeth on the left and right sides of the upper and lower jaws, totaling 20 teeth, which fully grow from 6 months after birth to about 3 years old. At the age of 6 ~ 7, deciduous teeth begin to fall off.
The second eruption is called permanent teeth, with 8 teeth on the left and right sides of the upper and lower jaws, totaling 32 teeth. At the age of 6 ~ 7, 1 molars erupted and deciduous teeth began to be replaced. At the age of 13 ~ 14, all deciduous teeth were replaced. But the third molar (also known as "wisdom tooth" or "full head tooth") will not grow until about 20 years old.