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G 7881 Dental Disinfector

Consultants’ Comments

  • “I like that it holds a lot of cassettes and that there is space for individual instruments as well. Works well for washing, rinsing and drying.”
  • “I like how shiny and clean the instruments and cassettes look after the cycle.”
  • “This is so much better than dealing with dirty ultrasonic water.”
  • “Lesser quality instruments rust.”
  • “I would love a Clean/Dirty indicator on the outside of the unit.”


The G 7881 Dental Disinfector is a stainless steel, large capacity washer-disinfector with short program durations for processing instruments in a dental office. It is the only instrument cleaning system that also provides high level disinfection. The unit features Multitronic Novo Med 45 controls with five standard cleaning and disinfecting programs, a four-fold filter system, double-skinned construction with insulation for low noise emissions, a flow meter for control of water intake, an electric door lock, program failure check, visual and audible signals for end of program and two spare sensors for temperature monitoring and control. Water quality is essential to the proper function of G 7881 Dental Disinfector (see box). The user may select a wash cycle with or without disinfection and optional drying. Disinfection occurs when the water is held at 200°F (93°C) for 10 minutes. The unit may be permanently installed under the counter like a dishwasher, or it can be free standing or slid into a 24” space. Special detergents, a neutralizer and rinse aid, tested for use in the machine, are required. The liquid detergent and neutralizer are dispensed automatically into the washer via tubing to bulk packages of the products. The G 7881 Dental Disinfector is designed for large loads and holds numerous instrument cassettes. Loose instrument baskets are also available.  The G 7881 Dental Disinfector was evaluated by nine consultants during an eight-month period. It received a 91% clinical rating.


Clinical Note

Good water quality is essential for processing instruments in the G 7881 Dental Disinfector or instrument corrosion may result. Poor water quality consists of, but is not limited to, high concentrations of chlorides (50 ppm or over). High chloride levels will cause even high-quality stainless steel instruments to rust when processed in the machine. Other effects that may be noticed are tarnishing or bluing of instruments due to dissolved minerals in the water. Rinsing the instruments with pure water, generated by either deionization (DI) or reverse osmosis (RO) eliminates these mineral residues and in turn eliminates instrument discoloration, rust and/or corrosion. Miele proactively tests the water quality in every practice either purchasing or considering a purchase of the G7881 Dental Disinfector. When the chloride level tests 50 ppm or greater, a water purification system designed to fix undesirable water chemistry is recommended.

The O-SO Pure HERO Gold (DWS-HERO-RODI) dental water system was installed to supply pure water directly to the G 7881 Dental Disinfector for this clinical evaluation. The HERO Gold also delivers deionized water through a separate faucet for sterilizers or operatory water bottles, eliminating perpetual distilled water purchases. This system produces 8 gallons per hour and includes a 7-gallon central storage tank. A separate 3-gallon tank holds deionized water, for delivery through a red faucet or remote dispensing gun with a15’ reach. With the HERO Gold, water softening is not required to obtain these results.


Clinical Tips

  • Run once after the morning patients and once in the afternoon before leaving for the day.

  • Smaller hygiene cassettes are easier to put in and take out of the top rack if you stand them up instead of laying them sideways.

  • After the drying cycle, allow items to cool before handling.

  • Items that are not suitable for processing in this washer-disinfector include aluminum, carbon steel or chrome-plated instruments; handpieces; burs; endodontic instruments; and plastics that cannot withstand the high temperature.

  • Be prepared for the extra time involved and cost of cleaning agents for the machine.