Precious metal porcelain has been used very rarely, and precious metal porcelain has to calculate the metal cost in real-time prices. The price of gold is changing all the time. Most doctors’ quotations are not very good, so naturally, they use got less.
In terms of physical properties, hardness cannot be used only as a standard. Usually, we talk about the metal used for denture restoration, and the physical properties (generally referred to as mechanical properties) are mainly based on strength/hardness/strain.
Because there are fewer and fewer pure metal crowns at present, the direct contact between teeth and metal is mostly in areas such as occlusal rests of removable dentures. The evaluation of the mechanical properties of metal materials mainly involves the ability to resist impact strength, the ability to resist elastic deformation, the ability to plastic deformation/failure, and the resistance to material fatigue. Dental materials are biological materials, which are mainly considered from three aspects: mechanical properties, chemical properties, and biological properties.
Non-precious metal alloys include cobalt-chromium alloys, nickel-chromium alloys, stainless steel alloys, and titanium alloys.
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Among them, pure titanium materials are currently developing very fast, and it is hoped that the processing machine tools can keep up with it as soon as possible.
At this stage, cobalt-chromium alloys are more common in clinical practice. Also, if it’s all-metal, don’t think about the color. At present, metal porcelain still needs opaque porcelain.
If you mainly need to restore the color, consider the veneer. The thickness of the current veneer can be about 0.1mm, and the light transmittance and color are very beautiful. All-ceramic crowns are also not once and for all in terms of color.
Since the full zirconium crown is integrally formed with a dental zirconia block, the current problem is that the color is still not real enough, it does not have layers, gradients, and the permeability is average. The zirconium porcelain crown is made of porcelain on the basis of the full zirconium bottom crown, which partially solves the problems of hierarchy, gradient, and permeability, but the mechanical properties of the zirconium porcelain crown are not as good as that of the full zirconium crown. It is usually used for anterior teeth and cannot be used for Posterior teeth that do a lot of chewing work (full zirconium crowns are usually used for posterior teeth).
On this issue, there are also solutions for gradient dental zirconia block, but they are still not perfect. We look forward to new material solutions and processing solutions to solve this problem. Prosthodontics has always been a discipline in which materials determine technological development. At this point, I think all prosthodontists should pay tribute to the material researchers and process innovators who silently support us behind us. Only with harmonious and smooth medical-technical communication can patients be provided with better aesthetic restoration solutions.
