Many of you have commented on the usefulness of the "Assistina how does this thing work" and the "What you should know about highspeed electric handpieces" articles in a past issues. Thanks for the positive feedback. As a result of our conversations, we want to share some new information about both. The issue came up that an office using an Assistina to clean and lube their Kavo 25-LPA was having a high failure rate. As a result, we did some testing and we found, when we put a high speed attachment in the Assistina and ran it for one cycle there was no evidence that the oil had reached the head of the handpiece. It took at least 2 cycles to adequately lubricate and clean the attachment. All of this makes perfect sense when you look at the difference between the air driven high speed and high speed electric attachment (see illustration below).
In the air driven handpiece the air and oil from the Assistina goes directly through the drive air tube to the turbine bearings (of which there are only 2). However in the high speed attachment. The oil and air enter the body of the attachment where it must spread over 6 or more bearings, as well as gears, springs, and drive shafts before it can do its job. The obvious solution is to use multiple cycles to add more lubricant. The Assistina delivers approximately 1cc of oil into the air line when the button is released. If you press and release the button 3 times you have only used 3cc of lubrication which is a small price to pay for a longer lasting attachment. I hope this information will help you and your customers to get a better result from their equipment and your repairs.