This is a good example of how technology is really improving dental equipment so that it can be more affordable and have a smaller footprint with minimal technical training needed. This will allow more dentists to offer a wider range of services within their existing practices and business models, which ultimately benefits the patient also.
Definitely this seems like a good fit for 3D printing by making a painstaking process more affordable and cost effective. It's good to see the little labs being able to take advantage of the innovation.
Once we have a digital "image" of the crown, I would like the data to be fed to a small CNC milling machine which then sculpts the crown out of a modern corrosion proof alloy such as monel or Inconel. This would give a permanent crown without useng over-priced "squishy" metals. At present we use these precious alloys because they are amenable to low temperature casting, yet they are hardly ideal either mechanically nor economically.
The gold used for crowns is actually a very good material. It is very corrosion resistant and best of all it is not too hard. If you make a crown out of a material that is very hard it causes excess wear on the opposing teeth. I would only choose a hard material like porcelain on one of my teeth that is very visible and a color match with adjacent teeth is critical.
Interesting point. Of course if ceramic materials are not too hard (cause erosion of mating teeth) then i can't see why a metal would be. As for corrosion resistance, certainly any of the high-nickel alloys would be far more than adequate. Even the 300-series stainless steels would be fine. Perhaps I should mention that one reason I avoid gold is for ethical reasons, considering the corrupt, polluting and vicious industries that produce most of it.
j-allen, that's an interesting idea. However, I wonder about the bio-compatibility of some of the alloys you mention, Also, newer alloys have been created specifically for making these dental devices, for example, BEGO's Wirconium: http://begousa.com/Wironium_FAQ.wss
Ceramics do cause a lot more wear on opposing teeth. The main reason they are used is because most people don't want to have a gold front tooth. People want a color matched ceramic (porcelain) for cosmetic reasons. The gold is much less likely to chip and is tougher. I'm not sure of the exact composition of the gold alloy used in crowns but I don't think they are even 50% gold.
The article says that in a fully digital operation, impressions are no longer needed. I assume that the patient's mouth would be 3D scanned, correct? If so, what type of 3D scanner would be used for that?
J-allen, Gold is the best metal for implants because it has zero corrosion and absolutly no rejection problems. Stainless steel can have severe corrosion issues in the body, that's why it no longer is used in joints or other critical implants. Many people are allergic to nickel alloys also, even when it is used in jewelry. Have you ever looked at a fitting on a boat or railing and witnessed "stainless Steel" rust stains?
Titanium is another premium medical metal with no rejection or corrosion problems, however if you ever worked with it, it is very difficult to machine. Your average medical lab would have problems with it and would have a steep learning curve.
As the 3D printing and overall additive manufacturing ecosystem grows, standards and guidelines from standards bodies and government organizations are increasing. Multiple players with multiple needs are also driving the role of 3DP and AM as enabling technologies for distributed manufacturing.
A growing though not-so-obvious role for 3D printing, 4D printing, and overall additive manufacturing is their use in fabricating new materials and enabling new or improved manufacturing and assembly processes. Individual engineers, OEMs, university labs, and others are reinventing the technology to suit their own needs.
For vehicles to meet the 2025 Corporate Average Fuel Economy (CAFE) standards, three things must happen: customers must look beyond the data sheet and engage materials supplier earlier, and new integrated multi-materials are needed to make step-change improvements.
3D printing, 4D printing, and various types of additive manufacturing (AM) will get even bigger in 2015. We're not talking about consumer use, which gets most of the attention, but processes and technologies that will affect how design engineers design products and how manufacturing engineers make them. For now, the biggest industries are still aerospace and medical, while automotive and architecture continue to grow.
More and more -- that's what we'll see from plastics and composites in 2015, more types of plastics and more ways they can be used. Two of the fastest-growing uses will be automotive parts, plus medical implants and devices. New types of plastics will include biodegradable materials, plastics that can be easily recycled, and some that do both.
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