Differences between dental implants and natural teeth

Today, more and more dental implants are accepted by ordinary people. Some people think that dental implants are so good that they can completely replace natural teeth. They even think that dental implants are the third tooth of humans. It is undeniable that implants are the best denture after missing teeth, and there is almost no feeling after the teeth are comfortable and beautiful. Unlike active teeth, Jue has a strong foreign body sensation and doesn't like the porcelain bridge grinding her teeth next to it. However, the performance of dental implants is very different from that of natural teeth. The following is divided into three aspects.

one. The difference between bone and bone

There is a periodontal ligament between the natural teeth and the alveolar bone. One end of the main periodontal ligament is embedded in the cementum and the other end is embedded in the alveolar bone, fixing the tooth in the alveolar socket. The teeth are firmly connected to the alveolar bone through the periodontal ligament. The periodontal ligament is very important to the function of the teeth. It has sensory functions. The periodontal ligament is rich in nerves and terminal receptors and is sensitive to pain, pressure and vibration. The periodontal ligament regulates and cushions chewing forces and protects the alveolar bone.

Peripheral receptors in the periodontal ligament may be sensitive to the hardness of food. When the thickness of food reaches 20um, the periodontal ligament can be felt. What is the concept of 20um? The average thickness of hair is 70um, and the thickness of periodontal ligament is 3.5 times the thickness of hair. The periodontal ligament receptors are highly sensitive, so the teeth are well protected. There is no periodontal ligament between the implant and the alveolar bone, and it is directly combined with the alveolar bone, just like steel and cement. The alveolar bone is difficult to implant and has no cushioning effect. Of course, there are no sensors. The feeling of a dental implant is completely created by the surrounding bone. With a thickness of 20um of food, implant teeth are not felt. The minimum thickness of dental implants that can feel food reaches 50um, and natural teeth are 3 times more sensitive than dental implants. Since there is no periodontal ligament around the implant, the feedback protection mechanism of the implant is insufficient. When the chewing force exceeds the range of the implant, the implant does not know the risk, and the implant is prone to accept large chewing force.

two. Differences Between Implants and Natural Teeth.

Since natural teeth have periodontal ligament, natural teeth can sink 25 to 100um in the vertical direction, while dental implants can only sink 3 to 5um.

There is a big difference between horizontal teeth and natural teeth: the horizontal movement of natural teeth can be 56-108um, only 10-50um. The range of horizontal movement of natural teeth is 5 times that of implants.

The difference between movement patterns: Natural teeth can move quickly or gradually, while implants can only move gradually. it

The rotation centers of movement are different: the rotation center of natural teeth is located at the apical 1/3, while the rotation center of implants is located at the top of the alveolar ridge. The rotation axis of natural teeth is long, while the rotation axis of implant teeth is short, and the rotation axis of implant teeth is Poor resistance to rotation.

Loading Difference: The chewing forces are evenly distributed along the natural root, whereas the chewing forces of the implant are concentrated at the top of the alveolar ridge.

Also see the points above: natural teeth move faster, farther and are more resistant to rotation than dental implants. When the chewing force exceeds the implant and natural teeth, the natural teeth are avoided, but the implant response is slow and trauma will be advanced.

three. The difference between the anatomical location of dental implants and natural teeth.

The diameter of the implant is 3.5-5mm, which is much smaller than the diameter of natural teeth. Even if individual teeth are much stronger than implants, the tooth above is an example: the width of the neck of a natural tooth is 6 - 7 mm, which is twice the thickness of an implant. The diameter of the implant is smaller if compared to the posterior teeth, which have more than one root, usually 2-3 roots, some posterior teeth have four roots, and the fork opens in a polygonal shape.

Theoretically, the implant should be placed at the root of the tooth. The direction of the implant is consistent with the direction of the natural teeth, but it is difficult to achieve because the remaining alveolar bones are not evenly absorbed. The alveolar bones of the lips and cheeks are easily absorbed, while the alveolar bones, tongue and palatine bones are not easily absorbed. Plants are usually planted where there are bones. Where there is bone, the placement of the implant is not exactly the same as the position and orientation of the natural teeth.

Dental implants should also avoid some important anatomical structures. The mandibular neural canal, maxillary sinus, etc. also make the orientation of the implant inconsistent with the natural teeth.

These factors make dental implants easy to form. Cause porcelain teeth to loosen and fall off.