Teeth In A Day Zirconia Dental Implants | Book Free ... Crowns can last for years with proper care and regular cleanings. Dental crowns are a popular solution for restoring damaged teeth. Call or take advantage of the online scheduling tool to set up an appointment with Dr. Visot to find out more about this procedure. This is because crowns rarely fail. It cannot be stained nor chipped. Zirconia crown cost. Can zirconia crowns be removed? How much does a zirconia bridge cost? How Much Does It Cost To Get Veneers Uk 2. HOW LONG DO TEETH VENEERS LAST FROM TURKEY? - Destinations 7-10 working days plus the trial and installation appointments. What compounds contain zirconium? - Restaurantnorman.com The main benefit of zirconia crowns is their strength and longevity. On the other hand, metal crowns might last for 20 years or even longer. Depending on the material used and your dental habits, the lifespan of a veneer versus a crown is similar, but veneers may not last as long because they are thinner. An Emax veneer is composed of a substance called ' lithium disilicate ', which is a very durable glass ceramic that is resistant to fracture. Zirconium Veneers price goes from USD 250 each to USD 750 per Tooth . It is extremely cosmetic, and is the #1 type of dental veneer that is purchased by patients across the nation. Zirconia veneers: Veneers, zirconia or otherwise, can last one day to 20 years or more.While they might be stronger, there might be a difference in esthetics as they tend to be more opaque, which is an advantage in certain cases, and a disadvantage in others. It showed that at 10 years, the success rate was 97% (2270 crowns that lasted over a decade). No crown will last forever, but 10-15 years+ is a good estimate. Primers that address the specific needs of non-silica oxides (zirconia, alumina, and metal) are highly beneficial and warranted when traditional retention/resistance form . Although IPS Empress, e.Max, and Zirconia veneers are pretty indestructible in vitro . What are Emax Veneers? - Best Dental in Houston, Texas Newman. When placed by a skilled doctor, e. max® veneers can last up to 20 years with proper care. How long should a dental crown last? For Indirect Porcelain/Zirconia Veneers. In this particular study, of 2,039 restorations, only nine needed to be replaced in . We understand that deciding to get dental implants is a big decision and investment - one that you are hoping will last a lifetime. The price for zirconium dioxide crowns is formed from several factors, including the number of crowns installed at one time, as well as the method of installation on your tooth or an implant, and How Long Do Zirconia Crowns Last In Dubai. veneers last? Porcelain fused to metal: may last for five to 15 years. How Long Do Zirconia Crowns Last Many factors affect the longevity of dental crowns. Sometimes the gum recedes and you can see a darker root surface above the veneer close to the gumline. When good oral hygiene is practiced along with regular visits to the dentist, zirconia crowns often last for 15 years or more. Zirconia crowns typically cost more than other types of dental crowns, such as ceramic, metal, and porcelain. Zirconia veneers are the strongest kind of veneers and are durable. How long do zirconia porcelain crowns last? How do you prepare for a zirconia crown? Dr Amit Goswami 2020-03-16T13:43:04+00:00 The world - Permanent & Life time — are thrown around a lot in dental field, but at Delhi Dental Center — Dr. Goswami - believes that nothing lasts a lifetime, it shouldn't be called as permanent. It is resistant to cold and hot foods or drinks and does not show sensitivity. Zirconia veneers have not been on the market long enough to truly know their lifespan. However, zirconia is the most durable material that is used to make veneers. That being said, it's not uncommon for dental crowns to last for up to 20 years, as durability depends on different factors. How long will a zirconia crown last? Zirconium crowns are long lasting compared to other crowns like PFM which have chances of cracking and chipping off the ceramic layer in some patients. How long do Emax porcelain veneers last? CEREC Crowns . How Long Do Porcelain Veneers Last? The Lifetime of a Dental Crown The placement of the crown in your mouth can also play a determining factor in the life of your crown. Porcelain veneers are more expensive than the indirect or direct composite resin alternative. Zirconia crown cost. It is extremely cosmetic, and is the #1 type of dental veneer that is purchased by patients across the nation. However, porcelain crowns possess superior esthetics and are used in cases aesthetics is a requirement. In fact, among all dental materials, E-Max matches the look of natural teeth the best. Laminate veneers, which is one of the aesthetic dental treatments, can be done at very affordable prices in Antalya, Turkey. This method allows the dental implants to provide a . With proper oral hygiene and care, a zirconia crown can easily last 10-15 years — or longer. These factors include tooth preparation - if the veneer is bonded to the tooth enamel (as opposed to the dentin layer underneath), that is a better, stronger bond and lasts longer. Zirconia is known for its durability. Zirconia is actually the strongest non-metal material which can be used to create a crown. If patients take care of their oral and dental health well, they can last longer. With good habits crowns can last even longer. In the cases with less retentive preparations, including veneers, the stable long-term bond of the restoration to the tooth becomes much more important to long-term success. This area can develop cavities if not kept clean. How long does veneers last? They are also sought after because of their aesthetics and tooth-like appearance. Do zirconia veneers look fake? How long do veneers last? Generally, when asked "how long do zirconia veneers last", patients can be advised that the veneers will last between five and ten years in most cases. Gold Crowns — They can last for 20 years or longer. Due to their undeniable strength and durability, Prettau Zirconia bridges can last for many years as long as they are cared for properly. A crown isn't expected to last a lifetime and usually need to be replaced after around 5-15 years. Laminate veneers single tooth price is 290 euros on average in Turkey. This is a vast improvement when compared to traditional veneers, which last approximately ten years on average. The Price May Vary depending on the location and brands used. All-porcelain & porcelain fused metal (or PFM) crowns usually last for 5 - 15 years. How do I take care of zirconium veneers? Zirconia offers superior strength and durability for dental crowns. Compared to some other crowns, zirconia crowns have a lower risk of breaking and chipping off the ceramic layer. Newman. Porcelain Crowns / Ceramic Crowns — They can last up to 15 years. How Does Veneers Work? E-Max is so durable, that it's possible to manufacture veneers that are as thin as 0.3mm. I have done some that are fine after 20 years, and often the reason for replacing them is cosmetic. That's 1,989 out of 2,340 crowns that lasted over 25 years (Walton, 2013). But, how long does a dental crown last? Porcelain fused to metal crowns provide a good balance between strength and aesthetics. This ensures that there are no joints in the construction and the crown can withstand maximum pressure. When placed by a skilled doctor, e. max® veneers can last up to 20 years with proper care. If the material is of good quality and in hand of an expert cosmetic dentist like Dr. Onur Ozel they can last for 20 years and function well. The best part is, there is no special tools or pastes required to care for them. As Antalya Dental Clinic, we apply porcelain laminate veneers in Turkey at a 5 to 1 low price compared to European prices. Such veneers are extremely unlikely to chip or break. Veneers typically last 5-10 years. According to Ada, the veneers last 5 to 10 years, but if Zirconia veneers are done right, with an accurate fit, and strict protocol, and well maintained, it can last 25 to 30 years easily. On average, veneers last 15 years but can last much longer, 20+ years, depending on various factors. They range in price from $1,000 to $2,500. However, certain behavior may increase the chances of their failing. A major portion of the tooth structure has to be reduced before the placement of a crown. Most veneers are made out of porcelain that provides excellent esthetics and longevity. An eMax dental crown lasts up to 15 years. How long do zirconium veneers last? Crowns are thicker than veneers. The procedure is very similar to other veneer fittings, including initial assessment followed by treatment. They're made of extremely tough lithium disilicate material. Zirconia crown cost In general, dental crowns in general can be very pricey, costing anywhere from $800 and $1,500. Request Appointment. Which is better zirconia or EMAX crowns? On average you can expect a dental crown to last for between five and 15 years, depending on different factors. It has been shown that lab-made porcelain crowns . While they may not last a lifetime, the consensus is that zirconia veneers can last between 10 and 20 years, and possibly longer with proper upkeep. Like traditional porcelain veneers, zirconia has excellent opalescent qualities and can be tinted to match the surrounding teeth. Porcelain veneers are one of our most popular cosmetic dentistry procedures for improving common tooth imperfections. 10 times stronger than your tooth enamel, in fact. With an excellent at-home oral health regimen and regular visits to your dentists for professional cleaning you can expect your veneers to last from 15-20 years! You simply continue using the oral . Over time, the metal margin of the crown tends to show as your gums recede. Composite teeth veneers Turkey can last more than 5 years and they need replacing after that.However they are cheaper than porcelain teeth veneers. A dentistry expert will help you . Zirconia veneers may easily last 20 to 30 years if done well. If applied correctly and with proper use (no excessive chewing of hard objects or direct impacts), then a set of zirconia veneers could last between 10 and 20 years How much does a zirconia crown cost? Porcelain veneers last between 10 and 20 years. For example, metal crowns are more durable and can last for up to 20 years, typically outlasting porcelain crowns. Zirconia veneers don't require any special care routine, so as long as you're brushing, flossing, and visiting Dr. Kosinski regularly, your veneers will last a long time. The Teeth in a Day implant technique involves the 2 front implants being placed straight into the front of the jawbone parallel to the previously existing teeth. In some cases, a one-day in-and-out procedure is all it takes to fit your affected tooth with a crown that can repair it permanently. Zirconia crown cost. 50 to 80% of crowns, however, will last for 15 to 20 years with good dental care. One study tracked the success rate of 2,340 crowns installed by one specialist. An element known as yttria naturally shares . E-Max is a great material for veneers as it is not only durable and bonds well with your tooth, but it also looks great. Ultrathin monolithic zirconia. Porcelain veneers are one of our most popular cosmetic dentistry procedures for improving common tooth imperfections. Clinical trials have shown that traditional veneers can last as long as 20 years, though the lifespan is usually about ten years on average. When the patient has too many missing teeth or adjacent missing teeth, zirconium is not usable. So, How Long Do Crowns Last? On average, a crown can last between 10 and 30 . On average, veneers last 15 years but can last much longer, 20+ years, depending on various factors. It is because they are among the most robust and most resilient of tooth crowns. Porcelain or Zirconia Veneers? Zirconia in dentistry Zirconia is a new generation of dental porcelain that sets new standards for aesthetics, biocompatibility, and clinical performance in dental applications. Dental crowns can last for decades or indefinitely. What is the difference between zirconia and porcelain crowns? 818-572-9579. In general, dental crowns in general can be very pricey, costing anywhere from $800 and $1,500. Zirconia Crowns: Zirconia crowns are a new material in the dental industry that provides great durability and are extremely long-lasting. In fact, according to one study in the Journal of Prosthetic Dentistry, these restorations have a 99 percent success rate. Veneers generally last between 5 and 10 years. How long do zirconia veneers last? Such ultra-thin E-Max veneers require little or . Brush and floss your teeth on a daily basis, paying special attention to the crown area. It all comes down to the unique conditions and the quality of the application and care. The cost of a zirconia crown is 1400 AED per unit. How Long Do Dental Veneers Last? Zirconia crowns typically cost more than other types of dental crowns, such as . To explain this further, 90% of dental crowns are still intact after five years before they need repair or replacement. When it comes to longevity, a well-fitting zirconia crown may endure anywhere from 10 to 15 years. Although IPS Empress, e.Max, and Zirconia veneers are pretty indestructible in vitro . How long does Emax crown last? . Most crowns can last a good 10 to 15 years, and a zirconia crown may even last a lifetime. How Long Do Dental Crowns Last ? However, strict protocols and an accurate fit can ensure that veneers last 25 to 30 years. Full set zirconia crowns will be roughly £3200 or €3500 or $4300 before any discounts. They range in price from $1,000 to $2,500. After long research of different dentists in Mexico, we got the average price for Zirconia Veneers Treatment. . The most important thing to note is that a single block of lithium disilicate is used to make Emax crowns. To schedule an appointment with the Belmont Dental Restorative Group, call (617) 489-1470. To learn more about teeth veneer Turkey, you can check our treatment page. With the ability to cover and conceal gaps, cracks, chips, and mild tooth misalignment, dental veneers have provided many patients with a more youthful and natural-looking smile. How To Play Music While Recording Iphone 12, St John's Food For The Poor Worcester, New England Highway System, Pittsburgh Predators Hockey Roster, Loyola Chicago Greek Life, Italy Earthquake 2016 Map, What Does Kris Mean In Japanese, Eau Claire Hockey Tournament, Tambach Teachers College, Microsoft Edge Favorites Bar Location, Places To Visit In Tanzania Zanzibar, Commonwealth Weightlifting Championships 2021, ,Sitemap,Sitemap">

how long do zirconia veneers last

Clinical trials have shown that traditional veneers can last as long as 20 years, though the lifespan is usually about ten years on average. How Long Do Dental Veneers Last? Teeth In A Day Zirconia Dental Implants | Book Free ... Crowns can last for years with proper care and regular cleanings. Dental crowns are a popular solution for restoring damaged teeth. Call or take advantage of the online scheduling tool to set up an appointment with Dr. Visot to find out more about this procedure. This is because crowns rarely fail. It cannot be stained nor chipped. Zirconia crown cost. Can zirconia crowns be removed? How much does a zirconia bridge cost? How Much Does It Cost To Get Veneers Uk 2. HOW LONG DO TEETH VENEERS LAST FROM TURKEY? - Destinations 7-10 working days plus the trial and installation appointments. What compounds contain zirconium? - Restaurantnorman.com The main benefit of zirconia crowns is their strength and longevity. On the other hand, metal crowns might last for 20 years or even longer. Depending on the material used and your dental habits, the lifespan of a veneer versus a crown is similar, but veneers may not last as long because they are thinner. An Emax veneer is composed of a substance called ' lithium disilicate ', which is a very durable glass ceramic that is resistant to fracture. Zirconium Veneers price goes from USD 250 each to USD 750 per Tooth . It is extremely cosmetic, and is the #1 type of dental veneer that is purchased by patients across the nation. Zirconia veneers: Veneers, zirconia or otherwise, can last one day to 20 years or more.While they might be stronger, there might be a difference in esthetics as they tend to be more opaque, which is an advantage in certain cases, and a disadvantage in others. It showed that at 10 years, the success rate was 97% (2270 crowns that lasted over a decade). No crown will last forever, but 10-15 years+ is a good estimate. Primers that address the specific needs of non-silica oxides (zirconia, alumina, and metal) are highly beneficial and warranted when traditional retention/resistance form . Although IPS Empress, e.Max, and Zirconia veneers are pretty indestructible in vitro . What are Emax Veneers? - Best Dental in Houston, Texas Newman. When placed by a skilled doctor, e. max® veneers can last up to 20 years with proper care. How long should a dental crown last? For Indirect Porcelain/Zirconia Veneers. In this particular study, of 2,039 restorations, only nine needed to be replaced in . We understand that deciding to get dental implants is a big decision and investment - one that you are hoping will last a lifetime. The price for zirconium dioxide crowns is formed from several factors, including the number of crowns installed at one time, as well as the method of installation on your tooth or an implant, and How Long Do Zirconia Crowns Last In Dubai. veneers last? Porcelain fused to metal: may last for five to 15 years. How Long Do Zirconia Crowns Last Many factors affect the longevity of dental crowns. Sometimes the gum recedes and you can see a darker root surface above the veneer close to the gumline. When good oral hygiene is practiced along with regular visits to the dentist, zirconia crowns often last for 15 years or more. Zirconia crowns typically cost more than other types of dental crowns, such as ceramic, metal, and porcelain. Zirconia veneers are the strongest kind of veneers and are durable. How long do zirconia porcelain crowns last? How do you prepare for a zirconia crown? Dr Amit Goswami 2020-03-16T13:43:04+00:00 The world - Permanent & Life time — are thrown around a lot in dental field, but at Delhi Dental Center — Dr. Goswami - believes that nothing lasts a lifetime, it shouldn't be called as permanent. It is resistant to cold and hot foods or drinks and does not show sensitivity. Zirconia veneers have not been on the market long enough to truly know their lifespan. However, zirconia is the most durable material that is used to make veneers. That being said, it's not uncommon for dental crowns to last for up to 20 years, as durability depends on different factors. How long will a zirconia crown last? Zirconium crowns are long lasting compared to other crowns like PFM which have chances of cracking and chipping off the ceramic layer in some patients. How long do Emax porcelain veneers last? CEREC Crowns . How Long Do Porcelain Veneers Last? The Lifetime of a Dental Crown The placement of the crown in your mouth can also play a determining factor in the life of your crown. Porcelain veneers are more expensive than the indirect or direct composite resin alternative. Zirconia crown cost. It is extremely cosmetic, and is the #1 type of dental veneer that is purchased by patients across the nation. However, porcelain crowns possess superior esthetics and are used in cases aesthetics is a requirement. In fact, among all dental materials, E-Max matches the look of natural teeth the best. Laminate veneers, which is one of the aesthetic dental treatments, can be done at very affordable prices in Antalya, Turkey. This method allows the dental implants to provide a . With proper oral hygiene and care, a zirconia crown can easily last 10-15 years — or longer. These factors include tooth preparation - if the veneer is bonded to the tooth enamel (as opposed to the dentin layer underneath), that is a better, stronger bond and lasts longer. Zirconia is known for its durability. Zirconia is actually the strongest non-metal material which can be used to create a crown. If patients take care of their oral and dental health well, they can last longer. With good habits crowns can last even longer. In the cases with less retentive preparations, including veneers, the stable long-term bond of the restoration to the tooth becomes much more important to long-term success. This area can develop cavities if not kept clean. How long does veneers last? They are also sought after because of their aesthetics and tooth-like appearance. Do zirconia veneers look fake? How long do veneers last? Generally, when asked "how long do zirconia veneers last", patients can be advised that the veneers will last between five and ten years in most cases. Gold Crowns — They can last for 20 years or longer. Due to their undeniable strength and durability, Prettau Zirconia bridges can last for many years as long as they are cared for properly. A crown isn't expected to last a lifetime and usually need to be replaced after around 5-15 years. Laminate veneers single tooth price is 290 euros on average in Turkey. This is a vast improvement when compared to traditional veneers, which last approximately ten years on average. The Price May Vary depending on the location and brands used. All-porcelain & porcelain fused metal (or PFM) crowns usually last for 5 - 15 years. How do I take care of zirconium veneers? Zirconia offers superior strength and durability for dental crowns. Compared to some other crowns, zirconia crowns have a lower risk of breaking and chipping off the ceramic layer. Newman. Porcelain Crowns / Ceramic Crowns — They can last up to 15 years. How Does Veneers Work? E-Max is so durable, that it's possible to manufacture veneers that are as thin as 0.3mm. I have done some that are fine after 20 years, and often the reason for replacing them is cosmetic. That's 1,989 out of 2,340 crowns that lasted over 25 years (Walton, 2013). But, how long does a dental crown last? Porcelain fused to metal crowns provide a good balance between strength and aesthetics. This ensures that there are no joints in the construction and the crown can withstand maximum pressure. When placed by a skilled doctor, e. max® veneers can last up to 20 years with proper care. If the material is of good quality and in hand of an expert cosmetic dentist like Dr. Onur Ozel they can last for 20 years and function well. The best part is, there is no special tools or pastes required to care for them. As Antalya Dental Clinic, we apply porcelain laminate veneers in Turkey at a 5 to 1 low price compared to European prices. Such veneers are extremely unlikely to chip or break. Veneers typically last 5-10 years. According to Ada, the veneers last 5 to 10 years, but if Zirconia veneers are done right, with an accurate fit, and strict protocol, and well maintained, it can last 25 to 30 years easily. On average, veneers last 15 years but can last much longer, 20+ years, depending on various factors. They range in price from $1,000 to $2,500. However, certain behavior may increase the chances of their failing. A major portion of the tooth structure has to be reduced before the placement of a crown. Most veneers are made out of porcelain that provides excellent esthetics and longevity. An eMax dental crown lasts up to 15 years. How long do zirconium veneers last? Crowns are thicker than veneers. The procedure is very similar to other veneer fittings, including initial assessment followed by treatment. They're made of extremely tough lithium disilicate material. Zirconia crown cost In general, dental crowns in general can be very pricey, costing anywhere from $800 and $1,500. Request Appointment. Which is better zirconia or EMAX crowns? On average you can expect a dental crown to last for between five and 15 years, depending on different factors. It has been shown that lab-made porcelain crowns . While they may not last a lifetime, the consensus is that zirconia veneers can last between 10 and 20 years, and possibly longer with proper upkeep. Like traditional porcelain veneers, zirconia has excellent opalescent qualities and can be tinted to match the surrounding teeth. Porcelain veneers are one of our most popular cosmetic dentistry procedures for improving common tooth imperfections. 10 times stronger than your tooth enamel, in fact. With an excellent at-home oral health regimen and regular visits to your dentists for professional cleaning you can expect your veneers to last from 15-20 years! You simply continue using the oral . Over time, the metal margin of the crown tends to show as your gums recede. Composite teeth veneers Turkey can last more than 5 years and they need replacing after that.However they are cheaper than porcelain teeth veneers. A dentistry expert will help you . Zirconia veneers may easily last 20 to 30 years if done well. If applied correctly and with proper use (no excessive chewing of hard objects or direct impacts), then a set of zirconia veneers could last between 10 and 20 years How much does a zirconia crown cost? Porcelain veneers last between 10 and 20 years. For example, metal crowns are more durable and can last for up to 20 years, typically outlasting porcelain crowns. Zirconia veneers don't require any special care routine, so as long as you're brushing, flossing, and visiting Dr. Kosinski regularly, your veneers will last a long time. The Teeth in a Day implant technique involves the 2 front implants being placed straight into the front of the jawbone parallel to the previously existing teeth. In some cases, a one-day in-and-out procedure is all it takes to fit your affected tooth with a crown that can repair it permanently. Zirconia crown cost. 50 to 80% of crowns, however, will last for 15 to 20 years with good dental care. One study tracked the success rate of 2,340 crowns installed by one specialist. An element known as yttria naturally shares . E-Max is a great material for veneers as it is not only durable and bonds well with your tooth, but it also looks great. Ultrathin monolithic zirconia. Porcelain veneers are one of our most popular cosmetic dentistry procedures for improving common tooth imperfections. Clinical trials have shown that traditional veneers can last as long as 20 years, though the lifespan is usually about ten years on average. When the patient has too many missing teeth or adjacent missing teeth, zirconium is not usable. So, How Long Do Crowns Last? On average, a crown can last between 10 and 30 . On average, veneers last 15 years but can last much longer, 20+ years, depending on various factors. It is because they are among the most robust and most resilient of tooth crowns. Porcelain or Zirconia Veneers? Zirconia in dentistry Zirconia is a new generation of dental porcelain that sets new standards for aesthetics, biocompatibility, and clinical performance in dental applications. Dental crowns can last for decades or indefinitely. What is the difference between zirconia and porcelain crowns? 818-572-9579. In general, dental crowns in general can be very pricey, costing anywhere from $800 and $1,500. Zirconia Crowns: Zirconia crowns are a new material in the dental industry that provides great durability and are extremely long-lasting. In fact, according to one study in the Journal of Prosthetic Dentistry, these restorations have a 99 percent success rate. Veneers generally last between 5 and 10 years. How long do zirconia veneers last? Such ultra-thin E-Max veneers require little or . Brush and floss your teeth on a daily basis, paying special attention to the crown area. It all comes down to the unique conditions and the quality of the application and care. The cost of a zirconia crown is 1400 AED per unit. How Long Do Dental Veneers Last? Zirconia crowns typically cost more than other types of dental crowns, such as . To explain this further, 90% of dental crowns are still intact after five years before they need repair or replacement. When it comes to longevity, a well-fitting zirconia crown may endure anywhere from 10 to 15 years. Although IPS Empress, e.Max, and Zirconia veneers are pretty indestructible in vitro . How long does Emax crown last? . Most crowns can last a good 10 to 15 years, and a zirconia crown may even last a lifetime. How Long Do Dental Crowns Last ? However, strict protocols and an accurate fit can ensure that veneers last 25 to 30 years. Full set zirconia crowns will be roughly £3200 or €3500 or $4300 before any discounts. They range in price from $1,000 to $2,500. After long research of different dentists in Mexico, we got the average price for Zirconia Veneers Treatment. . The most important thing to note is that a single block of lithium disilicate is used to make Emax crowns. To schedule an appointment with the Belmont Dental Restorative Group, call (617) 489-1470. To learn more about teeth veneer Turkey, you can check our treatment page. With the ability to cover and conceal gaps, cracks, chips, and mild tooth misalignment, dental veneers have provided many patients with a more youthful and natural-looking smile.

How To Play Music While Recording Iphone 12, St John's Food For The Poor Worcester, New England Highway System, Pittsburgh Predators Hockey Roster, Loyola Chicago Greek Life, Italy Earthquake 2016 Map, What Does Kris Mean In Japanese, Eau Claire Hockey Tournament, Tambach Teachers College, Microsoft Edge Favorites Bar Location, Places To Visit In Tanzania Zanzibar, Commonwealth Weightlifting Championships 2021, ,Sitemap,Sitemap

how long do zirconia veneers last