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Committed To Developing Into An Excellent Brand Of Dental Materials, Equipment And Dental Digital Solutions.
Article Outline
What are Zirconia Blocks?
Where is it used?
How are zirconia blocks made?
Zirconia block application in dentistry restoration
Which zirconia block is best?
What are the pros and cons of zirconia?
At last: FAQ
1. What are Zirconia Blocks?
Zirconia (ZrSiO4) is a mineral belonging to the silicates class, This results in positive characteristics such as high flexural strength (>1400 MPa*), hardness (1200 HV*), and a Weibull module of 15,84*.
Zirconia blocks are a type of ceramic material used in dentistry to construct crowns, bridges, and dental implants. They are also highly biocompatible, non-toxic, and durable, making them ideal for dental prosthetics. Zirconia blocks are available in a variety of shades to match the natural color of teeth.
Zirconia, or zirconium dioxide, has been used in various industries for many years due to its excellent mechanical properties. However, its journey in dentistry, specifically in the form of zirconia blocks, has been relatively recent and can be summarized as follows:
Present Day: Today, multi-layer zirconia blocks, which feature different levels of color and translucency within the same block, are available. These blocks can provide highly aesthetic results that closely mimic the appearance of natural teeth.
The development of zirconia blocks has revolutionized restorative dentistry, providing an option that combines strength, biocompatibility, and aesthetics. As technology continues to advance, we can expect to see further improvements in the properties and applications of zirconia in dentistry.
In addition to its high resistance, Zirconia is fully biocompatible. That is why it is increasingly used in the medical field (auditory, finger, and hip prostheses) and dentistry (pins, crowns, bridge restorations, implants). In industry, it has already been used for more than 30 years. The basic white color of Zirconia, the possibility of coloring in dentin colors, and its biotechnological characteristics enable the production of biocompatible, high-quality, and esthetical dental and implant reconstructions.
Here are some of the key areas where zirconia finds applications:
Dentistry: Zirconia is widely used in dentistry for restorative and prosthetic purposes. It is used to fabricate crowns, bridges, implant abutments, and even full-arch implant-supported prostheses. Zirconia's excellent mechanical properties, biocompatibility, and tooth-colored appearance make it a popular choice in modern dental treatments.
Ceramics and Glass Industry: Zirconia is extensively used in the ceramics industry for manufacturing high-performance ceramic components. It is used in the production of ceramic knives, grinding media, cutting tools, and wear-resistant components. In the glass industry, zirconia is utilized as a refractory material in glass furnace linings and crucibles.
Aerospace and Defense: Zirconia's exceptional strength, high-temperature resistance, and low thermal conductivity make it valuable in aerospace and defense applications. It is used as a thermal barrier coating in turbine blades, engine components, and heat shields. Zirconia-based ceramics are also employed in ballistic armor and protective shields.
Biomedical and Healthcare: Zirconia is utilized in biomedical applications such as hip replacements, dental implants, and medical tools. Its biocompatibility and resistance to corrosion make it an ideal material for long-term implantation in the human body. Zirconia-based materials are also used in medical imaging equipment, such as X-ray and CT scanner components.
Foundry and Refractory Materials: Zirconia is used in foundries as a mold material due to its ability to withstand high temperatures and thermal shock. It is also used in refractory materials for lining furnaces, kilns, and incinerators where high thermal resistance is required.
In summary, zirconia finds applications in dentistry, ceramics and glass industry, aerospace and defense, biomedical and healthcare, as well as foundry and refractory materials. Its versatility, strength, high-temperature resistance, biocompatibility, and electrical properties contribute to its wide range of uses in different sectors.
Zirconia blocks, used for dental restorations, are produced through a complex process that involves several stages. Here's a general overview of the process:
1. Raw Material Preparation: The process starts with the selection of raw zirconium ore, which is then subjected to a series of purifying processes. The purified zirconium is combined with oxygen to form zirconium dioxide (ZrO2) or zirconia, the base element of zirconia blocks.
2. Powder Preparation: The zirconium dioxide is then processed into a fine powder and mixed with various stabilizers, often yttrium oxide (Y2O3). Mixing with stabilizers prevents the zirconia from transitioning into a less stable crystalline form at room temperature.
3. Isostatic Pressing: The zirconia powder mixture is then placed in a rubber mold and subjected to isostatic pressing. This process involves applying equal pressure from all directions, resulting in a uniformly dense, cylindrical "green body" of zirconia.
4. Pre-Sintering: The "green body" is heated in a sintering oven at a lower temperature (around 1000°C - 1100°C). This process gives the zirconia block its initial solidity, but it remains slightly porous and can be easily milled into the desired shape.
5. Milling: The pre-sintered zirconia block is now ready to be milled into the desired shape of a dental restoration using CAD/CAM technology. The CAD/CAM software designs the restoration based on the digital impressions of the patient's mouth, and the milling machine carves the restoration from the zirconia block.
6. Coloring (optional): Before the final sintering, the restoration can be colored using special coloring liquids if desired. The color penetrates the slightly porous structure of the pre-sintered zirconia.
7. Final Sintering: The milled restoration undergoes a final, high-temperature sintering process. This step gives the zirconia its final hardness and density, shrinking the restoration to its final size.
8. Glaze and Polish: Post-sintering, the restoration is polished and, if required, glazed to enhance aesthetics and to provide a smooth surface that minimizes plaque accumulation.
Remember, the entire process must maintain strict quality control standards. The quality of the raw material, the precision in each processing step, and the overall attention to detail contribute to the final zirconia block's quality and performance.
Zirconia (zirconium dioxide) blocks are extensively used in dental restorations due to their high strength, excellent durability, and favorable aesthetic qualities. Here are some of the primary applications in detail:
Dental Crowns: A crown is a tooth-shaped "cap" that is placed over a tooth to restore its shape, size, strength, and improve its appearance. Zirconia crowns are known for their superior strength and long-term durability, which makes them suitable even for high-stress areas like molars. Zirconia can be shaded to match the color of natural teeth, making the crowns blend seamlessly into the patient's mouth.
Bridges: A bridge is a prosthesis used to replace one or more missing teeth. It's anchored on either side by a crown on a natural tooth or an implant. Given its high fracture resistance and toughness, zirconia is an excellent material for bridges, which need to withstand the forces of biting and chewing.
Implant Abutments: Abutments are the components that connect the dental implant to the artificial tooth. Zirconia is often used as a material for abutments due to its excellent biocompatibility and aesthetic qualities.
Veneers: Even though less common than porcelain for this application, zirconia can be used for veneers in certain cases. Veneers are thin shells that are bonded to the front surface of the teeth, and zirconia veneers are well-tolerated and can offer a high degree of aesthetics.
Inlays and Onlays: Zirconia can be precisely milled to create inlays and onlays, which are indirect restorations used to treat tooth decay or other structural damage. They offer a good middle-ground solution between fillings and crowns.
Full-Arch Restorations: For patients who need to replace all teeth in the upper or lower jaw, high-strength zirconia can be used to create full-arch prostheses.
To fabricate these restorations, dental professionals use CAD/CAM (Computer-Aided Design/Computer-Aided Manufacturing) technology. CAD/CAM technology allows the digital design and direct milling of zirconia restorations, either in a dental lab or, in some cases, directly in the dental office, providing a fast and accurate method for creating high-quality restorations.
When choosing a zirconia block for dental restorations, several factors should be taken into consideration:
1. Biocompatibility: Zirconia's biocompatibility is exceptional. As an inert material, it does not interact chemically with the body or provoke an immune response. This reduces the risk of inflammation, allergic reactions, or rejection, promoting healthier gum tissues around the restoration. Its low thermal conductivity also reduces sensitivity to hot and cold. Moreover, zirconia's smooth surface discourages plaque accumulation, reducing the risk of periodontal disease.
2. Mechanical Properties: The strength and toughness of zirconia are among the highest of all ceramic materials, protecting against fractures and increasing durability. Different types of zirconia (3Y-TZP, 4Y-PSZ, 5Y-PSZ) offer different mechanical properties: 3Y-TZP has the highest strength and toughness, often used for posterior crowns and bridges; 4Y-PSZ and 5Y-PSZ offer better translucency for anterior restorations but at slightly lower strength.
3. Aesthetics: Zirconia's color and translucency can be closely matched to natural tooth enamel, providing superior aesthetic results. High translucent zirconia is available for anterior restorations where aesthetics are critical. However, achieving a perfect match requires skill and artistry from the dental technician, as the opacity of zirconia can pose challenges in blending seamlessly with surrounding natural teeth.
4. Dental Preparation: Zirconia restorations require minimal tooth reduction, preserving more of the natural tooth structure and promoting oral health. This conservative preparation is a significant advantage, especially for patients whose tooth structure is already compromised. However, the preparation must be precise to ensure a proper fit of the zirconia restoration.
5. Longevity: Zirconia restorations can last for many years due to their high strength and fracture toughness. The longevity of zirconia restorations is also influenced by the patient's oral hygiene habits, occlusal forces (forces exerted during biting and chewing), and the accuracy of the restoration's fabrication and cementation. Regular dental check-ups are crucial for monitoring the condition of the restoration and intervening at the first sign of any issue.
6. Skill and Experience of the Dentist: The success of zirconia restorations heavily relies on the dentist's skill and experience. The dentist must accurately prepare the tooth, take precise impressions, and ensure proper fit and cementation. Furthermore, the dentist must understand the properties of zirconia and how to work with it optimally. This includes knowledge of the different types of zirconia and their applications, troubleshooting any problems, and providing patients with appropriate advice on how to care for their zirconia restorations.
Choosing the "best" zirconia block depends largely on the specific needs of the dental case, considering factors such as the type of restoration, the location in the mouth, aesthetic requirements, and the patient's oral condition. Here's a more in-depth look at some of the top zirconia blocks available:
Ivoclar Vivadent's IPS e.max ZirCAD: This zirconia system has a range of blocks with different translucency levels and strengths to accommodate various clinical situations. IPS e.max ZirCAD MT Multi, for instance, boasts a gradient transition of color and translucency, leading to highly aesthetic results. On the other hand, IPS e.max ZirCAD Prime offers exceptional strength and is suitable for monolithic and anatomically designed posterior restorations. Ivoclar Vivadent's blocks undergo a rigorous process to ensure a high level of quality and consistency.
3M's Lava™ Zirconia: Lava Zirconia is recognized for its robustness and durability, making it an excellent choice for posterior restorations. This block has excellent milling properties, leading to precise, well-fitting restorations. It offers a balance of aesthetics and strength, with a natural tooth-like fluorescence and a variety of shade options for a match with natural tooth color.
VITA's YZ Solutions: VITA provides an array of zirconia blocks, including VITA YZ HT for high translucency and VITA YZ ST for extra strength. These blocks are versatile and provide excellent aesthetics. The blocks can be used monolithically or veneered with compatible VITA porcelain.
Zirkonzahn's Prettau® and ICE Zirkon: Known for their exceptional strength and aesthetics, these blocks are often used for full-arch restorations and in areas with high masticatory load. The Prettau zirconia is completely metal-free, highly biocompatible, and resistant to plaque, making it comfortable and safe for patients.
Kuraray Noritake's KATANA™ Zirconia: KATANA zirconia is unique for its multilayered structure with varying translucency, mimicking the natural gradation of a tooth. This makes it especially suitable for anterior restorations, where aesthetic demands are high. KATANA blocks come in a range of translucency levels and color depths to accommodate different needs.
Each of these blocks has their unique strengths and considerations. The final decision should take into account the specific needs of the dental case, including the type and location of the restoration, the dentist's expertise and preference, the compatibility with the milling system in use, and the cost implications. Always consult with a dental professional or a dental lab technician to make the most suitable choice.
Bonus: Yucera
Apart from the dental material and equipment suppliers previously mentioned, Yucera has also become a notable player in the industry, offering unique characteristics that set it apart from other brands. Yucera focuses on providing low-cost but high-quality digital dental solutions, making it an attractive option for buyers mindful of cost and quality.
1. High Strength and Durability: One of the defining characteristics of Yucera zirconia is its high strength. It exhibits excellent fracture resistance, making it suitable for dental restorations, especially in high-stress areas like molars. The durability of this material means that, with correct oral hygiene, the restorations can last for many years. Yucera's focus on producing high-quality zirconia blocks contributes to the strength and durability of the final restorations.
2. Aesthetics: Yucera zirconia offers superior aesthetic results. Its natural tooth-like color and translucency help create restorations that blend seamlessly with the surrounding natural teeth. Yucera provides different types of zirconia blocks, including highly translucent options for anterior restorations, where aesthetics are critical. Multilayer zirconia blocks from Yucera have integrated color gradation, providing life-like, aesthetically pleasing restorations.
3.Biocompatibility: Zirconia's biocompatibility is one of its most significant advantages, and Yucera zirconia is no exception. As an inert material, it does not interact with the body, reducing the risk of allergic reactions or inflammation. It also discourages plaque accumulation, promoting healthier gum tissues around the restoration. This biocompatibility makes Yucera zirconia a safe choice for patients, contributing to the overall success and longevity of dental restorations.
From 43% to 57% gradient for transparency
Strength shows gradient from 700MPa to 1200MPa
Suitable for anterior , crown and 14 unit bridges
From 43% to 57% gradient for transparency
Strength shows gradient from 700MPa to 1050MPa
Suitable for anterior , crown and 7 unit bridges
Multilayer color
No need for further dyeing operation
Suitable for anterior, crown and bridge
Pre-shaded technics
Uniform color
Without post dyeing process
Suitable for full contour crown, bridge and anterior
High translucent
Brilliant bending strength and economical Block
Suitable for coping, framework
Multilayer zirconia block, White zirconia block, Colored zirconia block
The definitions, differences and applications of these three.
1. Multilayer Zirconia Blocks:
Multilayer zirconia blocks are a type of zirconia block that are designed with layers of varying color and translucency, mimicking the natural gradient of a tooth from the more translucent enamel to the darker dentin. This results in a more aesthetically pleasing and natural-looking restoration. The gradation in translucency and color is achieved during the manufacturing process where different layers of zirconia powder, each with a different shade or translucency level, are pressed together and then sintered. They are often used in anterior restorations where aesthetics are highly important.
2. White Zirconia Blocks:
White zirconia blocks, also known as monolithic or uncolored zirconia blocks, are made from a uniformly colored, highly pure white zirconia. These blocks provide exceptional strength and durability but lack the natural look of multilayer or colored zirconia. However, they can be colored after milling but before the final sintering by using coloring liquids. These are often used when strength is the primary concern, such as in posterior crowns or bridges.
3. Colored Zirconia Blocks:
Colored zirconia blocks are similar to white zirconia blocks, but they are pre-colored during the manufacturing process to match the various shades of natural teeth. They provide a good balance of aesthetics and strength, although they might not achieve the same level of aesthetic gradation as multilayer zirconia. These blocks are useful when a specific tooth shade is needed for the restoration, and the color is uniform throughout the block.
In terms of applications, all three types of zirconia blocks can be used for a wide range of restorations, including crowns, bridges, veneers, and implant abutments. The choice between them often depends on the specific needs of the patient, the location of the restoration in the mouth, and the preferences of the dentist and patient for aesthetics and strength.
Zirconia, particularly in dentistry, offers numerous advantages but also has a few potential drawbacks.
Pros of Zirconia:
Aesthetics: It can be stained and glazed to match the color of natural teeth, providing a highly aesthetic result.
Biocompatibility: Zirconia is a biocompatible material, meaning it is not harmful or toxic to living tissues.
Cad&Cam: Computer-aided design and manufacturing processes provide patients with a precise fit, thus reducing the chair time required to adjust and cement these restorations.
Strength and Durability: Zirconia is very strong and resistant to crack and fracture, thus providing longevity to dental restorations.
Less Tooth Removal: Due to its strength, zirconia restorations require less tooth structure to be removed than other materials.
Cons of Zirconia:
The disadvantages of zirconia crowns are minimal. The material's toughness has raised some concerns about friction against the tooth root and wearing down opposing teeth. However, frequent check-ups help reduce the possibility of damaging opposing teeth. Initially, only bone-white substructures could be produced for zirconia crowns, sometimes creating problems in achieving an aesthetically-perfect appearance.
How Does the Aging Process of Zirconia and The Involved Loss of Strength Compare with The Usual Metal Ceramics?
The aging process of zirconia, also known as low-temperature degradation (LTD) or "zirconia disease," has been a topic of interest and research in the dental community. This phenomenon occurs when the crystal structure of zirconia transforms from the tetragonal phase to the monoclinic phase, which can lead to micro-cracking and potential strength degradation. It's usually triggered by moisture and heat over time.
However, in the context of dental restorations, the impact of LTD on the clinical performance of zirconia needs to be clarified. Some studies have suggested that the in-vivo environment (temperature, moisture) may not be severe enough for significant LTD to occur within the lifespan of the restoration. Additionally, dental manufacturers have developed high-translucency zirconia with 'cubic-phase' dominance, which reportedly shows better resistance to LTD.
Conversely, usual metal ceramics (also known as porcelain-fused-to-metal or PFM restorations) don't undergo the same type of aging process. Instead, their longevity can be affected by other factors, such as porcelain chipping or wear, corrosion of the metal substructure, or marginal degradation, leading to secondary caries or periodontal disease.
When comparing the strength:
Zirconia: Even with potential LTD, zirconia restorations are incredibly strong, with flexural strengths typically ranging from 500 to 1200 MPa, depending on the type and brand of zirconia. Its high strength has made it a preferred material for posterior crowns and bridges, which must withstand significant biting forces.
Metal Ceramics: Metal ceramic restorations have stood the test of time with a well-documented history of durability and longevity. The flexural strength of the ceramic portion is much lower than that of zirconia (around 90-100 MPa), but the supporting metal substructure provides the necessary strength for the restoration.
In conclusion, both zirconia and metal ceramics have their pros and cons, and the choice between the two will depend on various factors like the location of the restoration, aesthetic considerations, cost, and the dentist's preference. Contemporary zirconia, with advancements in manufacturing techniques and material properties, provides a reliable and aesthetic alternative to traditional metal ceramics. However, it's always important to remember that successful dental restoration involves not only material choice but also proper treatment planning, preparation, fabrication, and maintenance.
Aesthetics Comparison Zirconia/Metal Ceramics
The aesthetics of dental restorations play a crucial role in patient satisfaction and acceptance. Both zirconia and metal ceramics, or porcelain-fused-to-metal (PFM), are commonly used materials in dental restorations. Here's a comparison of their aesthetic qualities:
Zirconia:
Translucency: One of the primary aesthetic advantages of zirconia is its transparency. Zirconia can be made to closely mimic the translucency of natural teeth, especially high-translucency zirconia. This is particularly advantageous in anterior restorations where aesthetic demands are high.
Color Matching: Zirconia can be color-matched to the patient's natural teeth, and multilayer zirconia blocks even offer gradient color that mimics the natural tooth from cervical to incisal.
Metal-free: Zirconia restorations are metal-free and thus avoid the dark metallic margin that can sometimes be visible in gum recession cases with PFMs. They also provide a solution for patients with metal sensitivities.
Metal Ceramics (Porcelain-Fused-to-Metal or PFM):
Porcelain Aesthetics: The porcelain part of PFM restorations can be aesthetically pleasing due to its color and transparency properties.
Metal Substructure: The metal substructure in PFMs can sometimes impact the aesthetics of the restoration. The opaque layer used to mask the metal can limit the restoration's translucency. In cases of gum recession or thin gingival biotype, the metal margin might become visible, causing a grayish discoloration at the gum line.
Color Matching: While porcelain color can be matched to natural teeth, creating a natural-looking restoration, the presence of the metal substructure might require multiple layers of porcelain to hide, affecting color matching and translucency.
In summary, while both zirconia and metal ceramics can produce aesthetically pleasing results, zirconia often has the edge due to its transparency, ability to mimic natural tooth color, and absence of a metal substructure. However, the final aesthetic outcome can also depend significantly on the dentist's and technician's skills, the quality of the preparation and impression, and the specific patient's oral condition and aesthetic expectations. Always consult with a dental professional to make the most informed decision.
How Does The Durability of Zirconia Frame Structures, Including Veneering, Compare with Porcelain-Fused-to-Metal Crowns?
Zirconia and porcelain-fused-to-metal (PFM) are common materials used in dental restorations, each with its unique properties in terms of durability and longevity.
Zirconia:
Zirconia is known for its high strength and fracture toughness, making it a durable option for dental restorations. This strength has led to the increased use of monolithic zirconia restorations, which are made entirely from zirconia without the need for veneering porcelain.
When zirconia is used as a framework with a porcelain veneer (similar to PFMs), there can be risks associated with chipping or fracturing the veneer porcelain. However, advancements in material science have led to the development of high-translucency zirconia, which can be used monolithically, eliminating the need for a veneer and, thus, the risk of veneer fracture.
Porcelain-Fused-to-Metal (PFM) Crowns:
PFM crowns have a long history with a well-documented track record of durability and longevity. The metal substructure provides high strength, and the fused porcelain gives the crown its tooth-like appearance.
However, PFMs have potential issues. The porcelain veneer can chip or fracture, and while the metal substructure provides strength, it can also rust over time.
Comparison:
Both zirconia and PFM crowns have been successfully used in long-term dental restorations. However, both types of restorations carry the risk of veneer chipping or fracture. Monolithic zirconia crowns eliminate this risk by removing the need for a veneer altogether.
Both materials can cause wear on opposing teeth if the restoration's surface is not properly polished or glazed. Some research suggests that zirconia may cause more wear on opposing enamel than PFM, but this is still a topic of ongoing debate.
Overall, both zirconia and PFMs offer good durability for dental restorations. The choice between the two often depends on a variety of factors, including the location of the restoration, patient preference, cost considerations, and the dentist's experience and preference. It's always best to consult with a dental professional to determine the most suitable choice for each case.
How do The Costs Compare with Metal Ceramics?
The cost of dental restorations can vary significantly based on several factors, including the material used, the complexity of the restoration, dentist fees, lab fees, and regional differences in dental service costs. Here's a general comparison between the costs of zirconia and metal-ceramic restorations:
Zirconia Restorations:
Zirconia restorations tend to be more expensive than metal-ceramic restorations due to several factors:
Material Costs: Zirconia is a more expensive material compared to metal-ceramic.
Laboratory Costs: Fabricating zirconia restorations involves high-technology CAD/CAM processes, which can increase lab costs.
Longevity and Durability: Although initially more expensive, zirconia restorations may offer better long-term value due to their strength, durability, and aesthetic qualities.
Metal-Ceramic (Porcelain-Fused-to-Metal or PFM) Restorations:
Metal-ceramic restorations generally are less expensive than zirconia restorations, due to:
Material Costs: The materials used in metal-ceramic restorations, while still providing good strength and aesthetics, are typically less expensive than zirconia.
Laboratory Costs: The fabrication process for PFM restorations is well-established and generally less expensive, although it still requires skilled technicians for the best results.
Popularity: PFMs have been a popular choice for many years, and this volume has helped keep costs lower.
However, the potential for added costs down the line (like the need for replacement due to porcelain chipping or aesthetic concerns) should also be considered.
In conclusion, while zirconia restorations typically cost more upfront than metal-ceramic restorations, the choice between the two should not be made solely based on cost. Other factors, such as aesthetic requirements, the location of the restoration, patient preferences, and the overall treatment plan, should also be considered. Always consult with a dental professional to discuss the best options for your specific needs.
Experts among dental technicians are able to realize conventionally precious metal-based dental prosthesis constructions in zirconia.
In this connection, Yucera has developed the high-translucent Yucera Zirconia and a colouring technology especially coordinated with it. Thus, aesthetically appealing full Zirconia restorations can be manufactured.
Poor Oral Hygiene: Not properly cleaning the teeth and gums can lead to decay and gum disease, which can undermine the support for the dental bridge.
Physical Trauma: Accidents or injuries can damage the bridge, leading to its breakage. Habits like grinding or clenching teeth can also stress the bridge and cause it to break.
Wear and Tear: With time, the materials used for the bridge can wear down or weaken, making it more susceptible to breakage.
Poor Construction or Placement: If the bridge is not well constructed or improperly placed, it may not fit correctly or distribute bite force evenly. This can cause the bridge to break or fail prematurely.
Underlying Dental Issues: If the teeth supporting the bridge develop issues such as decay or periodontal disease, they can compromise the bridge's stability, leading to breakage.
Diet: Consuming hard or sticky foods can exert undue pressure on the bridge, causing it to break or become loose.
Yes, removable dental prostheses are a common solution for replacing missing teeth. They can be taken out for regular cleaning. Some types are:
Dentures are common removable prostheses that replace some (partial) or all (complete) teeth. They have artificial teeth on a gum-colored base.
Overdentures: Dentures fitting over remaining teeth, implants, or roots for extra support.
Dental Flippers: Temporary dentures replacing one or two teeth while awaiting a permanent solution.
Removable Bridges: Similar to regular bridges, but can be taken out for cleaning.
Though removable prostheses are flexible and often cheaper, they may lack the stability or natural feel of permanent options. The best choice depends on individual needs and circumstances and should be discussed with a dental professional.
Zirconia, a highly durable material often used in dental restorations like crowns and bridges, can last a very long time with proper care. On average, zirconia restorations can last anywhere from 5 to 15 years and, in some cases, even longer.
The lifespan of zirconia restorations depends on several factors, including the patient's oral hygiene practices, the precision of the fit, and the patient's diet and habits (like teeth grinding). Regular dental check-ups and good oral hygiene are crucial to prolong the lifespan of zirconia restorations.
The cost of zirconia teeth can vary widely depending on several factors, including the type of restoration (like a crown, bridge, or implant), the complexity of the procedure, the dentist's expertise, and geographical location.
On average, zirconia crowns can range from $500 to $3,000 per tooth. Zirconia bridges and implants will typically cost more due to the additional work and materials involved.
It's important to note that many dental insurance plans may cover a portion of these costs. Therefore, it's advised to check with your provider to understand what your policy covers. Additionally, the prices can vary, so it's best to consult with your dentist or dental specialist to get an accurate estimate.
While zirconia, like many other natural materials, can contain trace amounts of naturally occurring radioactive isotopes, the zirconia used in dental restorations is carefully processed and purified. This ensures that any potential radioactivity is reduced to negligible levels that are considered safe for use in the human body.
The International Atomic Energy Agency (IAEA) has established strict safety standards for the permissible levels of radioactivity in zirconia and other materials used in medical and dental applications. Dental zirconia manufacturers must adhere to these standards to ensure the safety of their products.
In conclusion, while raw zirconia may contain trace amounts of radioactive elements, the zirconia used in dental restorations is not considered radioactive and is safe for use.
CEREC Zirconia blocks come in a variety of sizes to accommodate different dental restoration needs. The most common dimensions for these blocks are:
14.5 x 19 x 15.5 mm: This size is typically used for single crowns or small bridges.
20 x 19 x 15.5 mm: This size is often used for larger restorations, such as multi-unit bridges.
40 x 19 x 15.5 mm: This size is used for larger or multiple restorations in a single milling process.
The exact dimensions can vary slightly, so it's always important to check the specifications of the particular zirconia block you're using. Always make sure the size of the block is appropriate for the restoration being milled to ensure a successful outcome.
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