Porcelain teeth, I believe the public must not be unfamiliar, is a restoration often used in restorative dentistry, to restore normal tooth shape and aesthetics, restoration of missing teeth and root canal treatment to protect the remaining tooth tissue and other roles. But there are many patients who are told that they need to remove metal crowns before doing MRI, so how much impact does the metal used in the oral cavity actually have on MRI? Dental hospital experts said: metal restorations in the oral cavity, in the MRI examination, will indeed have some impact on the accuracy of tissue images. A study shows that the same imaging sequence, gold alloy has the least impact, cobalt-chromium alloy is the next largest, nickel-chromium alloy, and all-ceramic crowns because they do not have a metal component, so there is no adverse image on the imaging examination. So how do we choose the right one for us from the many porcelain teeth? Porcelain teeth are usually divided into inner and outer layers, the inside is metal, the outside is covered with a highly aesthetic ceramic material, due to the different materials used in the production of porcelain teeth, the family of porcelain teeth is also extraordinarily rich in variety. Here’s how to choose the right porcelain teeth for you. Nickel-chromium porcelain alloy Non-precious metal nickel-chromium porcelain teeth are made of nickel-chromium alloy for the inner crown and porcelain for the surface layer. Its material is composed of: nickel, chromium, beryllium, manganese and other metals. Characterized by high strength, low price, and the ability to form a dense oxide layer, the past is one of the most common domestic use of porcelain teeth, in recent years, public hospitals have rarely seen this type of porcelain teeth, because the biggest problem of nickel-chromium alloy is that some patients can develop allergic symptoms. Nickel-chromium porcelain teeth on the person’s biggest irritation and adverse reactions mainly from the nickel metal. Due to the high activity of nickel compared to other metals, there is a free release of the metal, producing free black lines in the gums, and a slight toxic reaction. Foreign data show that 15-20% of women and 1-2% of men who wear nickel-containing hand jewelry have allergies and inflammatory reactions to the skin and mucous membranes, so nickel-chromium porcelain teeth have been eliminated in regular hospital dentistry. Precious metal porcelain alloy The main elements of precious metal porcelain alloy are gold, palladium, platinum, etc. Its outstanding advantage is that it is non-toxic and non-irritating, rarely causes allergies, and the precision of the restorations made is very high. In addition, the gold alloy orange-yellow base color is close to the human teeth and gingival tissue shades, without the problem of gray-black edges, looks beautiful and natural. Precious metal porcelain has been recommended by the industry for its excellent biocompatibility, but due to the high price of precious metal porcelain restorations, it is more difficult for ordinary domestic patients to accept. Cobalt-chromium porcelain alloy Nickel-chromium porcelain alloy has many disadvantages, while the high price of precious metals, ordinary people are difficult to accept, so the middle price of porcelain who can compete? Undoubtedly cobalt-chromium porcelain alloy has advantages, because it does not contain harmful nickel and beryllium elements, safe, reliable and reasonably priced cobalt-chromium alloy has become the patient’s first choice for non-precious metal porcelain restoration. Cobalt-chromium alloy by the more stable nature of the cobalt metal instead of nickel metal, in comparison, the metal is much more stable, the adverse stimulus to people less, and cobalt-chromium metal than nickel-chromium metal hard, wear-resistant, and porcelain powder bonding force is also a little. But it is always a cheap material, not completely prevent bad irritation and gum black line, is not the most ideal restoration material. All-porcelain teeth As the name suggests, is composed of porcelain, no metal crowns, so in the permeability, refractive index, transparency is far from metal porcelain teeth can not be comparable, so all-porcelain teeth than metal porcelain teeth more beautiful, closer to natural teeth, the price is naturally higher. However, because there is no metal inner crown support, it is a little less strong than porcelain teeth, so it is more suitable for aesthetic restoration of front teeth or cases of posterior teeth with a tight bite. Currently, the newly developed zirconium dioxide all-ceramic teeth are a great improvement in strength and are respected by practitioners as an option for patients. In short, in the choice of porcelain dental materials, should be combined with their own economic situation and specific dental conditions, under the guidance of a physician to select the most suitable for their porcelain teeth, so called the perfect treatment experience, so give the following recommendations: 1, cobalt-chromium porcelain has a very small toxicity, its toxicity is far less than nickel-chromium porcelain, almost harmless to the human body, allergic to the population is close to zero, so suitable for economic conditions General population; 2, noble gold porcelain is undoubtedly a better choice today, due to the population suitable for posterior restorations, for one material biocompatible, periodontal tissue and the human body basically no effect, the second is strong enough, the possibility of chipped porcelain low; 3, all-ceramic teeth both aesthetic and biocompatible, and no impact on future MRI examination, so suitable for better economic conditions, high requirements for aesthetic 4, the choice of materials also due to their own physical conditions, if there are chronic systemic diseases of the population, the priority is to choose all-porcelain crowns, followed by precious metal porcelain crowns; In short, a good porcelain teeth can not be separated from the good materials, but also need the doctor’s excellent technology, in order to make the porcelain teeth play the biggest role.