All (full) ceramic crowns
The increase in aesthetic requirements in dentistry in recent years has played a major role in the development of all-ceramic restorations. The most important reason why all ceramic restorations are preferred by patients and physicians is that they are very aesthetic as well as tissue-friendly. Since the presence of a metal substructure in metal-supported ceramic crowns prevents the passage of incoming light, it is very difficult to obtain a natural appearance due to the opaque ceramic layer applied to cover the color of the metal substructure.
Full ceramic restorations, on the other hand, have excellent esthetics since there are no unnatural reflections and metal banded appearance. Since there are no optical events such as reflection and scattering of the incoming light, the incoming light can pass through the crown to a large extent, so it has an aesthetic similar to the natural tooth. Corrosion due to metal alloy, toxic and allergic effects and gray coloration of the gingiva are not seen in all ceramic crowns.
In what situations is it applied?
Decayed, worn, broken and discolored teeth
In cases where aesthetics becomes the most important element and there is sufficient distance in closing
In cases where tooth structure and periodontal health must be protected, all ceramic crowns can be applied.
In what situations is it not applicable?
In cases where the closing distance after tooth cutting is less than 1mm.
In very short teeth where post-cut retention will be less
It is not preferred for individuals who have a strong and active muscle demand, use a pipe or have some professional habits.
What are the disadvantages?
All-ceramic crowns are more aesthetic than metal-supported ceramics, but they are not as durable. They can break more easily than metal-supported ceramics when faced with excessive pressure movements such as bruxism, clenching or trauma.
They are economically more expensive.
They require the physician and the laboratory to be much more meticulous and careful.
Zirconia ceramics
The use of zirconium in dentistry has come to the fore due to its durability and corrosion resistance. The usage areas of full ceramics, which have a disadvantage such as brittleness, are limited. The zirconia infrastructure, on the other hand, can be used successfully in anterior and posterior tooth deficiencies with its high fracture strength and hardness.
Zirconium is a gray-white metal in room conditions and is not found as a free metal in nature. The mineral state used in dentistry is zirconium oxide. The introduction of zirconium oxide (ZrO2) ceramics has led to the development of computer aided design and production technologies (CAD-CAM).
The white color of the infrastructure metal in zirconia ceramics has eliminated the aesthetic concerns experienced in other metal-supported porcelains. It takes its place in the first place in today’s dentistry by eliminating the possibility of breakage in full ceramic coatings with the durability created by its metal formation.
There are no restrictions limiting its use, but the cost is higher than other restoration materials.
