The latest interpretation of porcelain fused to metal
2016-05-06
The Puerto Rico feldspar mine, which is produced by the company of the US and the US, is processed by the deep processing, the VITA ceramic powder and its 3D color system almost form a monopoly tendency.
1, Ni Cr alloy porcelain crown (chromelalloyporcelaincrown):
Inside the crown components: nickel: 73.6% ~ 87.6%, chromium: 26.4% ~ 12.4%, the melting point of about 1455 degrees (here refers to the metal melting point, porcelain powder melting point is generally lower than the melting point of the crown). Casting shrinkage rate is 1.8% ~ 2.3%. Another Cu, W, Nb, Si, Ru, Al and Mo and other trace elements. Since nickel can react with saliva in the mouth to produce free nickel, accumulated at the gingival margin, known as black line (dye ash), affecting the appearance and is not suitable for the anterior teeth. The shelter is used for oral tooth loss repair. Said Ni Cr Based PFM crown diverse in the mouth within 20 years the toxicity, in fact, be far less than a minute to exhaust inhalation, a day of fried food (such as two deep fried dough sticks) daily for more than 6 grams of salt intake. Not for the front teeth, is mainly in the 3-5 years after wearing gray staining, and 5% of the rate of allergies. But the common allergy found only in the mouth blisters, or simply bloated lips.
2, titanium porcelain crown:
The titanium casting technology and equipment limitations, can not be titanium alloy material in an inert gas in casting, titanium alloy material in natural air casting (in theory should be in an inert gas atmosphere casting), titanium metal in the air oxidation and volatilization. In addition to the quality of light titanium itself, centrifugal casting, titanium castings can not enter the leap. That is, "titanium porcelain crown" does not conform to the standard of 6% ti. The actual content of titanium and nickel chromium ceramic content below. Is a lack of the middle price, but in the helpless or slightly hidden nature of the crown product, it is not recommended to choose.
3, cobalt chromium (cobalt-chromiumalloyporcelaincrown) in crown kaociya:
58.5%-64.5% 4.5%-7% Co, Mo, Cr 26.5%-30%, it can be seen that the cobalt chromium abandoned the "nickel" add, avoid saliva toxicity of nickel metal, is one of the ideal dental porcelain. Suitable for a variety of situations in any dental porcelain production. With moderate hardness, is the preferred replacement of Ni Cr porcelain. Just from the appearance, even is a doctor, or a mechanic, I is unable to distinguish between the chromium and cobalt chromium metal, usually in the purchase of ingot and casting, differentiates from the ingot shape, from the point of view of the initial texture, cobalt chromium steel slightly bright nickel chromium steel.
4, silver alloy porcelain crown (silverpalladiumporcelaincrown)
The amount of silver in more than 50% of the silver crown KaoCiYa, 20% palladium, 12% gold and 18% bronze. Silver is a low melting point, need ultra low temperature ceramic powder, whether it is the price of raw materials and the manufacturing difficulty are relatively high, the price of gold to the inner crown porcelain. The elasticity is moderate, taste simulation, silver itself has a toxin absorption function, suitable for middle grade anterior teeth, crown protection. As far as possible to avoid tooth span is too large (continuous loss of more than two teeth) crowns. The reason is the strength of silver is relatively weak, easily broken crown and bridge. It is interesting that a lot of places with love to call the silver palladium platinum crown porcelain.
5, pure titanium alloy (puretitaniumporcelaincrown):
99% pure titanium, with excellent biological safety, light quality, high hardness. Performance is the most stable of all medical metals. Is the ideal material in the oral repair materials, pure titanium metal is the only one that does not react with the body of the metal, is the highest biocompatibility of medical metal. Titanium metal hard, not easy to deformation, to make up for the metal and ceramic layer combination. The opinions of the pure titanium metal and ceramic powder with bad, mainly because the pure titanium casting difficulties, high rate of castings crown chlamydia, just porcelain powder casting attached to, this is pure titanium porcelain crown relatively high cost of the root cause of is because the internal failure rate is too high, in order to making the smooth casting, internal need to repeatedly casting. Once the casting is successful, it is still the highest metal porcelain neutral. Suitable for patients with high material safety factors, and their teeth and bone health of the population. The patient is not suitable for the short root and the bone of the jaw bone.
6, gold alloy crown (rhotaniumporcelaincrown):
Many non professional name, such as gold palladium gold porcelain crown, porcelain, gold porcelain etc.. Its gold content in the crown above 84%. Other containing platinum, palladium, to strengthen the intensity, Juenan metal allergies, help organism protein decomposition and absorption, is a precious metal ceramic Jiao Jiao. The only pure yellow, and the combination of ceramic, simulation of natural teeth high index. Used for the front teeth beauty, is a good choice. Its own flexibility, the highest ductility, the package is more rigorous, the buffer capacity of the strongest, very suitable for short root, poor bone repair and beauty of the teeth. But also because of this advantage, the risk of deformation of the gold crown is large, the probability of collapse porcelain is higher than other metals. But the porcelain rare in the anterior, posterior relatively common. So if you choose to do gold palladium porcelain teeth, should choose pure casting porcelain crown. Price will have a certain difference with the use of the weight of gold. Posterior teeth do crown is the most reasonable choice, many people worry about nuclear magnetic resonance would interfere, in fact, is an unnecessary worry, only organic will organic disadvantages. Gold because of its high toughness, that is, the probability of deformation is also high, so the combination of ceramic powder with a slight leakage, that is, the collapse of porcelain. In this regard teeth do porcelain fused to metal crown, regardless of what kind of porcelain fused to metal crown, in fact, are not reasonable, after all, porcelain, how much will affect the upper and lower teeth bite close, should make is pure metal casting crown. Porcelain fused to metal crown itself is used for anterior teeth, which is many people steal for gratitude, all ceramic crown is known as the beauty crown.
7, platinum porcelain crown:
To platinum as advocate material in metal porcelain crown, the domestic oral gold rely on Germany, the United States imports, the material itself useful physiological properties, with gold palladium ceramic
And pure titanium porcelain. The cost is several times of the gold alloy porcelain. Clinical significance is not.
8, gold deposition porcelain crown:
The porcelain fused to metal crown was produced by deposition technology. Expel lost a turn over the mold process, the fabrication error decreases, but due to combined with low degree of Jintang, the collapse of the porcelain base rate is high, is a waiting for the improvement of technology of porcelain crown. To take its excellent cosmetic results and close capacity, designed to belong to the front teeth beauty.
9, all ceramic teeth (all-ceramiccrown):
The ceramic fiber material is used to melt the inner crown, and the shape of the tooth is carved out of the porcelain powder. The biggest difference between all ceramic teeth and metal porcelain teeth is that there is no organic matter. The inner crown is made of transparent skeleton, and then the outer layer is made of porcelain powder. Because all ceramic itself has good transparency, and on the body no irritation, sense of the nature, but the relative brittleness of ceramic itself and is currently designed to anterior teeth beauty. This is also a lot of places called for beauty crown. Not suitable for missing teeth.
10, cast porcelain teeth (castingporcelaincrown):
Divided into two generations (also the third generation penetration porcelain modified products), generation to leucite as internal crown (that is, the above said all ceramic crown), also a flash in the pan casting glass ceramic crown, because performance instability, once out of the market, at present still in the improvement. ; second generation of lithium based ceramic crown is commonly known as the second alumina 95 corundum powder; as for the so-called third generation of cast porcelain currently there is no essential difference between, because the improvement of ceramic powder, certainly more than three generations, our ancestors 18 generations are some. Cast porcelain teeth into integral casting. Cast porcelain porcelain a, full name should be "cast the type of porcelain", and of course cast pressure is actually within the crown part, mainly French Tyszblat1987 invented in production of high strength, low shrinkage of all ceramic crown in Ceram technology is the glass infiltrated alumina kernel. The strength of ceramics is the regular glass ceramic strength 2 ~ 3 times, opaque. Can be used for severe tooth or discoloration of the metal post restoration of anterior teeth. Wolceram alumina crowns are the latest, it adopts ceramic deposition technology revolution, can reach 10 micron precision edge. It is a porcelain, but has improved, the most suitable for clinical teeth but the color is not ideal and restoration of anterior teeth.
11 and two zirconia crowns (zirconiumdioxideporcelaincrown):
Assisted by the whole porcelain piece of computer design, can guarantee the precision and degree of inner teeth. Now CAD/CAM porcelain crown. Clinical referred to as - zirconia ceramic crown. As the computer scanning chamber is connected with the milling machine manufacturing. The strength of resistance to brittle and metal ceramic can be comparable, no invasion of injury to the body, PFM ideal comprehensive performance. Applicable to the posterior, anterior teeth, tooth beauty. Because of the improvement of zirconia technology, medium low crown thickness from 1 mm initial reduced to 0. 8 mm, to grind teeth smaller, enamel loss rate is reduced. It is suitable for any kinds of porcelain production requirements of high-end situation. A sophisticated computer system. The error rate fell to 0.01 micron. But the error rate is said and the model, so in the absence of intra oral scanning technology to model free, before the use of digital data transmission, to produce accurate tooth model is the prerequisite for precision zirconia ceramic crown. At present, the clinical use of zirconia color is pure white, so in order to adapt to the subspecies teeth in red, must be decorated porcelain.
Zirconia crowns analysis through the. Thin see palmprint. But can carry 9 tons of weight per square centimeter. But it also has the weakness of the whole family of porcelain, is more than steel, toughness is not enough, when encountered greater than its pressure, or stress concentration, its overall broken case is not uncommon.
12, porcelain veneer (veneer):
Porcelain veneer suitable for permanent teeth whitening, simple teeth color is not ideal before the porcelain fused to metal products. Ultrathin type almost no molar. Specifications ranging from 0.3 to 1.5 mm. The existence of long-term enamel loss, that will lose luster texture. The thinner the porcelain, the more obvious the phenomenon. Domestic Procera porcelain veneer, CEREC bedside porcelain veneer. Feldspathic porcelain veneer. And so on, at present, more use of Swiss Procera porcelain veneer. Is a neat front teeth, but the best way to have pigmentation.
