1, smooth edge and tight fit. This is the most basic and important standard of porcelain teeth, and it is also a place with many problems at present. Accuracy is reflected in the joint between porcelain crown and teeth, which is the "life gate" of porcelain teeth, that is, the weakest point. The smaller the gap, the better. Otherwise, bacteria can easily get in, leading to dental caries and fracture, leading to complete failure. The gap is located below the gum and is usually ignored by patients. This gap will accompany the life of porcelain teeth and determine the fate of natural teeth. This is also the place to test the skills of doctors. Where there is gold content, every step of the treatment process has an impact on the accuracy.

2, the color is realistic, there is no chalk dust and blue, and the porcelain teeth that are in harmony with the color of adjacent teeth and skin are usually composed of inner metal and outer porcelain teeth. In order to cover the color of metal, there must be a certain thickness of porcelain layer. Usually, the thicker the porcelain layer, the better the aesthetic effect. Clinically, if the teeth are not prepared enough, it is easy to appear the phenomenon of white teeth or dim and hypertrophy. However, in pursuit of aesthetic effect, the increase of molars will easily lead to the exposure of teeth nerves and increase the possibility of fractures. Therefore, it is necessary to master accurate tooth preparation skills, which can not only ensure sufficient porcelain layer thickness but also not damage tooth nerves.

3, the shape of the teeth is vivid and coordinated, not fat or dull.

A common clinical mistake is that porcelain teeth become bigger, which leads to discomfort of lips and tongue and thick teeth. At the same time, the face becomes thicker and the shape of teeth is not good, which leads to bad stimulation of gums and swelling of gums. This is due to uneven and accurate cutting. At the same time, it is necessary to have a clear grasp of the characteristics and performance of various porcelain crowns, and make personalized tooth preparation, so as to ensure the minimum grinding amount of tooth tissue under the condition of ensuring sufficient porcelain layer thickness.

4. The gums are not red, congested and discolored.

Gum problems are usually ignored, and most failed medical records have gum problems. You can observe the gums of patients with porcelain fused to metal. If there is no redness, the bleeding is half done. Gingiva is a kind of silent tissue, even if it is injured, it will not cause severe pain, but the health of gingiva is an important indicator of the success of porcelain teeth. Every step of the operation process is not in place and has an impact on gingiva.