Compressed air for CAD CAM systems

The duty cycle of the compressors used in CAD CAM dental technology is significantly longer than it is in normal dental practice operations, and it also requires a higher pressure range – often between 7 and 9 bar. If the pressure drops below the minimum input pressure, this can lead to process interruptions that can get expensive.

Manufacturers all state their own requirements for the required compressed air quality.
The reasons for this are that

• oil and moisture on the blanks can have a negative impact on subsequent shaping and finishing processes, such as colouring, coating or glazing, or they can cause the workpiece to be destroyed during zirconium oxide burning.
• Dry compressed air prevents corrosion of the spindle components.
• Low particle content: no destruction of the spindle bearings due to particles and the mechanical abrasion caused by their presence.

And by the way, DÜRR DENTAL CAD CAM compressors satisfy the requirements for classes 2:4:0 as set out in ISO 8573-1.

In order to avoid pressure fluctuations, we recommend using a separate compressor for the milling machine. The minimum requirement is a separate pipe from the compressor to the milling machine, which must not be below the required dimensions. Otherwise we recommend the use of a buffer tank upstream of the milling machine.

There are several reasons for this. Firstly, a dental milling and grinding machine usually operates with a higher pressure. Although it is possible to increase the pressure setting on the compressor, this increased pressure will then be used for ALL devices in the practice, i.e. also the treatment units or the DAC – but this is not really necessary. Increased pressure always means more work for the compressor – and therefore higher energy consumption and increased wear.
In addition, the dental milling and grinding machine generally requires a great deal of air. Together with the compressed air demands of the other components in the practice, this can cause a significant drop in pressure in the pipes, and the milling machine will switch off. It takes a maximum of 10 seconds to set up the higher pressure range on our Tandem compressors.

❯ Touch the “Standby” button for at least 2 seconds.
❯ Touch the “Service” button for at least 2 seconds.

The blue LEDs in the operating panel flash. They are touch-sensitive and can be adjusted accordingly. The pressure adjustment is performed in 0.5 bar increments by touching the LED.

❯ Touch the first illuminated LED with your finger and drag it to the required switch-on pressure.
❯ Touch the last illuminated LED with your finger and drag it to the required cut-off pressure.
❯ Tap the “Service” button to confirm.

The tank offers additional buffering volume, which helps to stabilise the compressed air supply to the milling machine on compressed air networks with small pipe diameters or long distances between the DÜRR DENTAL CAD CAM compressor and the milling machine.

It provides adaptive and independent control of the units whilst continuously taking into account the compressed air consumption, and it also expands the compressed air range settings from 9 to 9.5 bar. In the case of rapid pressure loss, the 1st unit is started promptly to prevent the pressure from fluctuating below the minimum pressure level. The 2nd unit is additionally switched on as required – but only when needed in order to meet demand. This is smart, innovative and customer friendly. The Smart Power Mode can be retrofitted to existing devices at any time.

• Air quality compliant with ISO 22052
• Membrane drying unit for 100% duty cycle
• Easy adjustment of the pressure range up to 9.5 bar within a very short space of time via the control panel
• Air quality compliant with ISO 22052 (corresponds to class [2:4:0] for particles, moisture and oil in accordance with ISO 8573-1)

• Duo Tandem CAD CAM with two aggregates
• Quattro Tandem CAD CAM with two aggregates
• Quattro P 20 CAD CAM with four aggregates

ISO 22052 specifies requirements for the quality of dental compressed air to ensure the safety and effectiveness of dental equipment. It is applicable in dental practices and clinical facilities where compressed air is used for dental equipment. Our Silver Airline, CAD CAM and Tornado compressors supply air quality that meets the requirements for classes 2:4:0 and therefore even surpass the air quality requirements set out in ISO 22052.

Dental compressed air is defined in ISO 22052 whereas medical compressed air is defined in the European Pharmacopoeia and other standards. The main difference is the water content, which is more strictly defined for medical compressed air. However, this regulation refers to the provision of air in compressed air cylinders and not to the production of compressed air on site (compressor). A dew point of -22°C applies to medical compressed air, while the ISO standard specifies -21°C – so the values are comparable. Medical compressed air defines individual gaseous components that must be taken into account when ventilating patients; these are irrelevant for dental applications.

Manufacturers of dental milling machines have clearly defined requirements for the quality of the connected compressed air supply with regard to particles, oil and water content. Moisture present in the compressed air can cause damage to the milling machine. Oil can also impair the quality of the milling result. Thanks to our membrane drying unit, the bacteria filter and the use of special materials, DÜRR DENTAL CAD CAM compressors generate compressed air that is dry and oil-free – even surpassing the requirements set out in ISO 22052 (classes 2:4:0 in accordance with ISO 8573-1) and thus ensuring an optimised supply of compressed air to your dental milling machine.