Comparison Between Porcelain Fused to Metal and Zirconia
A long-lasting tooth repair should improve the function and aesthetics of a patient's decayed or broken teeth without sacrificing durability. Restorations for teeth often use Zirconia or porcelain fused to metals (PFMs). When compared side by side, these two materials do help restore the teeth's functionality and appearance, but they aren't identical. So, which one is more effective? Knowing the benefits and drawbacks of each material will help you choose the best one for your patient's restorations.
Porcelain Fused To Metal Dental Crown- An Overview
Crowns made of a combination of the two materials are the most popular choice, as the name suggests. The porcelain covering gives the teeth a more natural look, while the metal core gives it strength. Chrome nickel, chrome cobalt, and gold are among the most popular metals utilized for porcelain metal crowns. Nevertheless, the most common type is cobalt chrome alloy. What makes them special?
-Strong resistance to the force: Porcelain bonded to metal crowns are known for their customary high level of resistance. Because of the tremendous amount of force exerted when chewing food, molar, and premolar teeth are the teeth that dentists typically recommend using.
-Looks natural: Patients frequently worry that porcelain-fused-to-metal crowns will appear artificial. The truth is that with careful application of these materials, teeth can look very natural and beautiful.
-Reasonable pricing: The price is typically lower than that of other materials, including pure porcelain or zirconium crowns, which is one of the key advantages of this type of crown. Therefore, it is often among the options that patients desire the most.
-Key drawbacks: Porcelain fused to metal crowns have several major drawbacks, including the chance of allergic reactions, an unsightly shadowing appearance, and the possibility that the gums will recede and expose the metal over time. During preparation, the tooth experiences more wear and tear due to the increased space requirements caused by the thicker material.
Zirconium Crowns- An Overview
Here, you can choose between crowns made entirely of zirconium or those in which the zirconium is just the inside and the ceramic is the outside. It all comes down to the patient's needs; both are viable choices. Let’s check out the features:
-Enhanced resistance: They are far more durable than porcelain metal crowns and also give patients greater comfort by reducing the amount of bulk in their mouths. These crowns typically outperform porcelain-fused-to-metal ones by a wide margin.
-No allergy triggers: Porcelain bonded to metal crowns contains metals that, as previously mentioned, might cause allergies and other health issues. Therefore, the fact that dental zirconia is biocompatible and does not cause allergies is its primary benefit.
-A real tooth looks: Zirconium crowns have the quality of appearing lifelike because of their white hue, which mimics the color of natural teeth. Not only is the dental crown more long-lasting, but it also contains no metal.
-Enhanced personal cleanliness: In the absence of regular dental cleanings, dental plaque can corrode dental crowns. Zirconia crowns, on the other hand, mitigate this issue to a lesser extent because zirconium has the property of limiting adherence to tooth plaque.
-No heat is generated: Pain from extreme temperatures is a typical complaint among patients who have porcelain-fused-to-metal crowns. In contrast, zirconium's heat conductivity is modest.
What this means is that patients don't have to worry about the temperature of their favorite meals; they can eat them hot or cold.
Key drawbacks: If we had to pick one drawback with zirconium dental crowns, it would be the slightly higher price tag. However, there are several factors contributing to this, the most significant of which is the high cost of the material and the specific technology needed to craft the crowns.
What Are the Key Differences Between Zirconia and PFM Crowns?
A zirconia crown differs from a PFM crown in terms of the quantity and composition of its material layers. Zirconia crowns contain one high-strength substance, while PFMs contain metal and ceramic layers. The ultimate success of a restoration is heavily dependent on the material composition.
As an example, consider PFMs. Chipping, cracking, and shearing off of the ceramic strata has been a common occurrence in the past. Two main factors contribute to these breaks: To begin with, the material's lack of durability is directly attributable to the thin ceramic layer. Second, the layers expand and contract at different rates during production because the substructure metal and the layering ceramic have different thermal expansion characteristics. The finished restorations will have flaws and weaknesses due to this, particularly at the ceramic-metal junction.
In contrast, zirconia crowns are sintered as finished restorations after being machined from a solid block of zirconia. Due to the material's monolithic structure, all parts of the restoration will have the same material properties, eliminating problems seen in PFMs. With a flexural strength nearly ten times higher than the average feldspathic layering ceramic, zirconia also imparts notable performance characteristics.
Despite zirconia's superior strength compared to ceramics used in PFM crowns, the monolithic material does have one drawback: Bridges made of zirconia that cover vast distances in a compact space may eventually break because the connectors are so tiny. Since the metal substructure of PFM restorations guarantees a longer-lasting solution in those compact regions, Glidewell Dental Lab usually recommends them to dentists for these bridges.
When to Use Zirconia?
Crowns, bridges (up to 16 units), veneers, inlays, onlays, screw-retained crowns and bridges, and full-arch implant prostheses are just a few of the many indications where zirconia shines. Zirconia restorations are ideal for patients who are allergic to metals or who want long-lasting, reasonably priced dental work done. Zirconia restorations now provide aesthetically pleasing results for patients and can address most of the restorative and cosmetic issues that arise in modern dentistry as a result of the material's ongoing development and refinement.
When to Use PFMs?
As zirconia restorations have become the standard, fewer cases still call for PFMs, even though they were formerly the material of choice. Regarding dental restorations, PFMs don't hold a candle to zirconia crowns in terms of performance. However, there are times when they are still the better choice. For example, when a bridge doesn't have enough vertical height for zirconia connectors to work properly, when the restoration needs to match nearby PFMs, or when endodontically treated teeth have crown or root staining that would show through all-ceramic restorations, zirconia connectors are still the best choice.
Having looked at porcelain fused metal vs zirconia, it’s also important to have a look at the best CAD software for dentistry. There are many that are available, but we recommend using SelfCAD. SelfCAD is an easy to use 3D design software that comes with all the necessary tools for cleaning and editing 3D scans of dentistry and even preparing them for 3D printing.
Once you have scanned your dental structure, you can import it to SelfCAD by going to File > Import. SelfCAD supports most of the common 3D file formats and formats for 3D scanners.
After importing the design, you can start modifying it based on your needs. For example, you can fill any gaps or holes in the scans using the various tools of SelfCAD. Feel free to check out our article on 3D printing in dentistry to learn how you can do that. You can also check the 3D scanning for dentistry playlist on YouTube to learn how to use SelfCAD to prepare your files.
SelfCAD also comes with other important tools like the Magic Fix tool that helps clean the meshes, fix any non-manifold meshes, and ensure the design is ready for 3D printing.
After editing and cleaning up your meshes, you can use the built-in online slicer to slice the files and generate the Gcode to send to your 3D printer. The video below shows how to slice your designs in SelfCAD:
SelfCAD is affordable compared to other professional CAD software for dentistry, and you don’t need to install any add-on or extension as all the tools you need can be found on the software. There are also many interactive tutorials and SelfCAD academy that can help you master the software and general 3D modeling with much ease.
Porcelain Fused To Metal vs. Zirconia Crowns—Which is Better?
While PFM crowns are functional, there is a superior alternative available. Zirconia crowns offer several advantages to your practice, including improved strength, better fit, easier fabrication through a digital workflow (by digital labs like Dandy), better aesthetics, and more efficiency. There is also less waiting time after scanning and treatment decisions, which means more chair time to grow your practice.
In any market, there comes a point when advancements in technology make adoption an easy choice. When comparing zirconia crowns milled by a lab with precise digital measurements from an intraoral scan to PFM crowns, the benefits to patients and practices outweigh the tiny cost difference. Because they are easier to implant, these crowns and bridges are stronger, last longer, look better, and serve their intended purpose better.
Enjoy powerful modeling, rendering, and 3D printing tools without the steep learning curve.
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