Digital solutions have introduced significant changes in the manufacturing process of dental prostheses. Traditional techniques of manufacturing crowns, bridges, implants, or complete dentures have been replaced by CAD / CAM technologies. These technologies applied together with intraoral scanners and dental milling machines of small installation dimensions, enable the transfer of dental prostheses production from dental laboratories directly to dental offices. The process has become more simple, faster, and efficient. The patient can get a dental crown or bridge on the same day he comes to the dental office.
A scanner scans the teeth and creates a digital 3D impression. The CAD system processes it and, based on a comparison to the surrounding teeth, generates a proposal for a dental prosthesis, which can be then modified by a dentist or laboratory technician as needed. Subsequently, the CAD / CAM system sends instructions for the production of a dental prosthesis to a computer-controlled milling machine.
Dental prostheses made through CAD / CAM technologies have high durability and a natural appearance. They achieve high surface quality and fit well thanks to high precision scanning and production on modern dental milling machines (DMM).
The final quality of the dental prostheses and the efficiency of the production process significantly depend on the milling machine used, its construction, and components.
One of the key components influencing the basic features of dental milling machines are gearboxes in the rotary axes A and B used to position the table with the dental blank. The quality of the machined surface, the accuracy of production, thus whether the dental prosthesis will fit the patient well, but also the productivity of the machine and the time for which the machine can produce the dental prosthesis will depend on the type of gearbox used.
SPINEA® offers an ideal solution for DMM with TwinSpin® cycloidal gearboxes, which meet all requirements for positioning in the A and B axes and currently represent the best solution on the market in terms of accuracy, rigidity, torque capacity, and installation dimensions.
TwinSpin® gearboxes belong to the category of backlash-free gearboxes, which provide high positioning accuracy essential for the overall accuracy of dental prosthesis production. Thanks to the unique transmission mechanism, high production accuracy, and the use of high-quality lubricants, TwinSpin ® gears keep high positioning accuracy throughout their service life, thus ensuring the long-term quality and accuracy of DMM in which they are used.
Another very important feature of TwinSpin® gearboxes is high torsional and tilting rigidity, which are the key to the quality of the machined surface of dental prostheses. The high rigidity of SPINEA® gears enables higher machining speeds while maintaining excellent surface quality. Therefore, DMM with SPINEA® reduction gears achieves higher productivity and surface quality than machines with other gear mechanisms. High rigidity also allows for the processing of stronger and more durable materials of dental prostheses.
Minimization of machine dimensions represents one of the latest trends in DMM development. SPINEA® gearboxes have high torque density, i.e. the ratio of the rated torque to its dimensions [Nm / cm3]. Compared to, for example, harmonic gear mechanism, SPINEA® offers the gearboxes with more than double the parameter, which allows the machine to use significantly smaller size while maintaining power and thus minimize the machine dimensions, or use similar dimensions and thus increase the power of the drive unit. In addition, SPINEA®also offers DriveSpin® actuators, drive units that combine a servomotor and a precision TwinSpin® gear mechanism into a single compact unit of small dimensions, which simplifies the installation of the drive unit and allows an even higher degree of installation dimensions minimizing.
High overload capacity represents another great feature of TwinSpin®. It is expressed by emergency torque, which is five times the nominal torque value and is reflected in the machine's high reliability and resistance to potential damage, for example, due to incorrect machine operation.
TwinSpin ® high-precision reduction gears meet all requirements of current trends in the development of DMM. They represent the most ideal solution for the gear mechanism of the rotary axis in 5 axes dental milling machines and successfully replace previously used harmonic and planetary gearboxes.