Stratasys' MED610 clear bio-compatible dental material is rated for up to 24 hours of contact with mucous membranes, and can be used with the Objet30 OrthoDesk printer to make devices such as customized surgical guides for dental surgery. (Source: Stratasys)
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.
A slew of announcements about new materials and design concepts for transportation have come out of several trade shows focusing on plastics, aircraft interiors, heavy trucks, and automotive engineering. A few more announcements have come independent of any trade shows, maybe just because it's spring.
At the JEC Europe 2015 composites show in Paris last month, makers of composite materials, software, and process equipment showed off their latest innovations. This year's show saw some announcements related to automotive applications, but many of the improvements came in the world of aerospace.
The DuPont-sponsored Plastics Industry Trends survey shows engineers want improved performance in a broad range of plastics and better recycling technology. These concerns top even processing enhancements that improve productivity.
Plastics leader SABIC recently announced a global initiative to help its customers take advantage of additive manufacturing (AM) and also advance 3D printing (3DP) technologies in several application areas. The company's plans go way beyond materials, and also include design, processing, and part performance.
A theme that was reflected in several ways at NPE 2015 was the use of 3D printing to assist in, or improve on, injection molding, as well as improvements in 3D printing materials and processes that are making better functional prototypes and end-use parts.
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