QMT Features: December 2009
Multisensor CMM optimizes quality assurance in dental technology
Highly precise production equipment helps to ensure that dental prosthetics fit properly.

Skilled craftsmanship is vital in a dental lab. High-quality materials and precision down to the last detail contribute to health and quality of life. The latest manufacturing techniques guarantee high quality. To ensure this quality, AmannGirrbach, one of the leading companies in dental and dental laboratory technology, offers 500 products, ranging from an articulator to a chewing motion simulator to dental consumables.

A highly precise dental prosthetic, with reduced finishing and reworking, is more important than ever in dentistry. Highly precise production of the equipment used to make models is vital to ensuring that dental prosthetics fit properly. Very exact measurements are required to check the quality of the finished parts.  This, together with changes to the portfolio, increasingly narrowing tolerances and a rising number of freeform surfaces required new approaches in quality assurance.

AmannGirrbach utilizes a Zeiss O-Inspect multisensor measuring machine for optical and contact measurements in addition to a Zeiss Contura G2 coordinate measuring machine, both operating with CALYPSO measurement software. With CALYPSO, the quality of the parts can be checked on both the CONTURA G2 contact coordinate measuring machine and the O-INSPECT optical-contact coordinate measuring machine. Operators use the same interface regardless of the measuring machine or workpiece.

The implementation of a CAQ system (computer-aided quality) also demanded the implementation of reproducible processes. Here, in-depth quality assurance of the finished parts is vital. Mario Fröhle, head of Quality Assurance at AmannGirrbach, emphasizes that “quality assurance shortens and optimizes the manufacturing process, but should not be solely the task of the QA employee. The ease of use of ZEISS coordinate measuring machines is a key element. Inspection has thus become part of everyday work.”

Coordinate measuring machines in quality assurance have considerably shortened the inspection process and lowered the number of rejects. Workpieces which required 10 minutes to inspect in the past can now be checked in around three minutes in a CNC run. However, not only measuring time reduction, but also the increasing number of form and position tolerances demanded flexible methods in quality assurance. This is where the benefits of scanning technology from Carl Zeiss become evident. They enable the evaluation of linear tolerances, and form and position tolerances, in a single measurement. Low quantities and different parts demand frequent changes to the setup of the machines. Here, AmannGirrbach say it is particularly important to have a measuring system able to quickly and reliably provide the machine operator with correction values.
email: rcarlson@zeiss.com
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