When you go to the dentist and they ask you to rinse out your mouth, have you ever felt that your teeth and gums were stinging because the water was too cold?
The water rinsing unit (where the patient places a cup that automatically fills up with 80-100 cc of water) is located next to the dental unit where the patient sits. The water reservoir tank contains about two cups of water, which is heated by an attached water heater.
There are different kinds of heaters, such as immersible cartridge heaters and band heaters that are attached externally. Water is continually replenished in the tank, and the heater is controlled by a thermostat that is attached to the outside of the tank. As the heater is designed to heat the water to a lukewarm temperature, the total amount of time that it operates is comparatively short. The heater shuts off after heating the water for about one minute, heating 70ºF (22ºC) water to a temperature of 90–100ºF (32-42ºC) before it is poured into the cup. This prevents patients from feeling that stinging or unpleasant sensation in their teeth when rinsing with cold water.
One of our customers, a dental unit manufacturer, used to have corrosion problems with the immersion heaters that they were using… but after they switched to Kawai Corporation products, they told us that they’ve been free from their troubles. This kind of problem was to be expected, as we’ve proven in many tests regarding corrosion that occurs when metal is used in fluids.
Our customer tells us that they want to do away with the water tank and heat the water as it flows along the water channel, in order to supply even more sanitary water. They are still deciding on a heater. We’re still researching their request, as a high-wattage heater that gets rather hot would be required. It’s not an easy challenge, but we at Kawai Corporation haven’t given up. We continue to work towards finding an even more sanitary method to heat water, to establish as the standard for dental units.