- The best solution for dental technology

Hufschmied tool wins the dental technology benchmark of the Augsburg University of Applied Sciences 

Bobingen, Augsburg (Germany), September 1, 2020 - The Faculty of Mechanical and Process Engineering at Augsburg University of Applied Sciences has carried out a scientific comparative test of dental technology tools for zirconia machining. The conclusion: The choice of milling tools has a significant impact on the quality of the results and the efficiency of the machining process. The winner of the benchmark is a tool from Hufschmied Zerspanungssysteme GmbH that has been optimized for this material. Only with the HC720DT-DIP®3S milling tool from Hufschmied the finest structures could be machined effectively. Even in the tool life test it delivered consistently high quality.

The benchmark test of tools for machining zirconium dioxide was carried out by Lena Wieland as part of her bachelor thesis under the supervision of Prof. Dr. Ing. Ralf Goller (process technology for polymer and ceramic fibre composites). Ten manufacturers had provided milling tools for the machining of the ZrO2 ceramic, which is indispensable in dental technology. The benchmark followed the Merlon test, which has proven itself in the industry. In this test, dummy crowns with different wall thicknesses are milled from a ZrO2 blank.

Test procedure
The milling of the blanks was repeated with three tools from each manufacturer. The six tools from the manufacturers with the best results then took part in a further series of tests on tool life behaviour. For this purpose, the machining process was carried out two more times with one milling cutter already in use, so that one of the tools machined a total of three blanks. This shows the tool wear and its effect on the quality of the machining. What is striking is that the performance of uncoated tools drops dramatically from the second blank onwards. Only the Hufschmied tool shows the same high performance in all three runs.

"I congratulate Hufschmied on winning the benchmark for zirconium dioxide machining," says Prof. Dr.-Ing. Ralf Goller, Faculty of Mechanical and Process Engineering at Augsburg University of Applied Sciences." It has been confirmed once again: Material science and material engineering always includes process engineering - in this case material-optimized tools.

"The benchmark of the Augsburg University of Applied Sciences shows objectively how successful we were with the development of a special milling tool for cutting zirconium dioxide in the dental technology. Decisive for the outstanding results in terms of machining quality and tool life are the cutting-edge geometry of the HC720DT-DIP®3S, which is specifically adapted to the material, and our patented diamond coating. Here, dental technology follows the experience with industrial processes: Efficient and process-reliable production in dental technology is only possible with high-quality special tools," says Ralph Hufschmied, Managing Director of Hufschmied Zerspanungssysteme GmbH.

Adaptation to machine is equally important
The test was conducted with the 5-axis milling and grinding centre developed for the dental technology market Sirona inLab MC X5. The second-best result after the Hufschmied tool in the benchmark was achieved by a tool supplied by Dentsply-Sirona. No surprise for the machining specialist Ralph Hufschmied: "In addition to the adaptation of tools to the material to be machined, the consideration of the characteristics of milling machines and machining programs has the greatest effect. A practical consequence of the benchmark: manufacturers of milling machines for dental technology can score points by providing optimized tools. We are happy to offer our know-how in cooperation with them.

For those interested, the company Hufschmied has summarized the procedure and detailed results of the dental benchmark in a whitepaper - including tables of results for the tested tools: https://www.hufschmied-tools.com/en/wp-content/uploads/sites/4/2020/08/20-3253-HFS-Whitepaper-Dental_EN_200818_optimiert.pdf

Image source: Hufschmied Zerspanungssysteme // The images compare the milling tool from the company Hufschmied (left) and one of the uncoated tools (Zz right) after the entire test series.  Here a clear difference in the condition of the tools can be seen. While the tool on the left shows no flaws in the coating or in the geometry, the right picture clearly shows signs of wear (color-coded). The perfect condition of the benchmark winner from Hufschmied explains the consistently high quadratic performance in all three machining cycles.

Image Source: Hufschmied Zerspanungssysteme // With the HC720DTA, these small crowns can be milled without defects. The wall thicknesses can be milled down to 0.1 mm without breaking.

About the Faculty of Mechanical and Process Engineering at the Augsburg University of Applied Sciences
The Faculty of Mechanical and Process Engineering at the Augsburg University of Applied Sciences offers Bachelor's programs in Mechanical Engineering (B. Eng.) and Environmental and Process Engineering (B. Eng.) as well as Master's programs in Applied Research (M. Sc.), Mechanical Engineering (M. Eng.), Environmental and Process Engineering (M. Eng.) and Part-time Technology Management (M. Eng.). The Faculty of Mechanical and Process Engineering understands research as "application-oriented research": Scientific methods are used to generate knowledge in order to create new products and processes or to further develop existing products and processes. This new knowledge should benefit teaching. Research does not serve a purpose in itself, but should benefit society, taking into account human dignity and the aspects of sustainability (resource efficiency). In addition to numerous projects, especially on topics of materials research, there are two cross-departmental projects on simulation in mechanical engineering and on composites in mechanical engineering.

More information available at www.hs-augsburg.de

About Hufschmied Zerspanungssysteme GmbH
Founded in 1991, Hufschmied Zerspanungssysteme GmbH, headquartered in Bobingen near Augsburg, is a manufacturer of high-quality tools for machining production. By concentrating on the machining of plastics, glass fiber materials and carbon fiber at an early stage, Hufschmied has taken a leading position in Europe in the development of solutions for new materials. The company is an established system supplier to renowned machine tool manufacturers. 

Tools and production process consulting from Hufschmied are particularly valued in the automotive and aerospace industries as well as in medical technology. The company is involved in numerous organizations, including Composites United Deutschland e. V. Hufschmied's production facilities are based in Winterlingen in the Swabian Alb.

More information available at www.hufschmied.net

 

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Hufschmied Zerspanungssysteme GmbH

Sybille Schuller

+49 8234 9664-0

www.hufschmied.net

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