1. The color of the tooth surface turned brown.
2. Teeth may have banded or dimple depressions.
3. You can see parallel horizontal lines on the tooth surface.
4. The blade has become thinner.
5. The cusp of the posterior teeth is defective or disappeared.
6. Symmetry happened.
7. Multiple defects. According to the degree of the lesion, it is divided into mild, moderate and severe.
2. According to the degree of enamel hypoplasia, we should treat it accordingly. Mild and moderate cases were treated with fluoride or light curing, and severe cases were treated with nail retention or artificial crown.
3. If it is an economical porcelain tooth, it should be a titanium alloy porcelain tooth. The advantages of titanium alloy porcelain tooth are good biocompatibility, corrosion resistance and low thermal conductivity. But because of its high melting point; Difficult casting process; It is easy to be oxidized, the combination between metal substrate and porcelain layer is poor, and the porcelain layer is easy to collapse; Problems such as the need to use special porcelain powder for processing limit its wide application. But it is the precious metal alloy porcelain crown that pays attention to health: the porcelain crown with metal base crown made of precious metal is called precious metal porcelain crown. Precious metals have good chemical inertness, which makes them resistant to oxidation and corrosion. The most commonly used precious metals in dentistry include gold, platinum and palladium. You can decide according to your own situation.