Yes, you read correctly, we are going to abrade a magazine picture in order to objectively evaluate the machine. If the pattern is good then we will see an evenly abraded pattern on the page shaped exactly like the Application Window of the Handtool. Any hard abrasion will show up as a very white section or small dot within the pattern or a hole drilled completely through the page of the magazine (in some cases I have seen tiny dot holes go through seven pages of a test magazine). How would you like to be the owner of that machine.

Pick a picture with a lot of black ink for our test canvas. You will find that the person who sells this machine probably will not be interested in you doing these kinds of objective tests on their product. You can understand why. This is actual objective analysis of the over all ability of the machine to do a consistent abrasion with no place to hide poor performance in any area of design of any part of the machine.

Start out by abrading a string of stationary abrasion dots. Hold the Handtool on the page for 5 seconds at many different settings of the Treatment Pressure. High pressure will give a heavier abrasion, lower pressure will give a lighter abrasion - keep the time exactly 5 seconds. If the manufacturer has several handtools, or several application caps for the same handtool, use them all. The more you test the more you will know. This test will give you an overall picture of the abrasion pattern of the Handtool. Light or dark places in the abrasion pattern you should be able to explain based on common logic and thought process. If the handtool is held at a 45 degree angle to the page then you can expect a heavier abrasion distally, due to the closer impact of the early crystals and them bouncing up into the path of the later arriving crystals. The hard half moon patterns are typical of 45 degree offset handtools. That is why Bella does not manufacture this device.
Now abrade a line at a high treatment pressure, make the line 4 or 5 inches long. Move the handtool in a slow and constant movement. What you are looking for is light and dark spots in the line. These light and dark spots are caused by the machine crystal injection method not holding a steady stream of crystal injection. This will be exactly the same pattern that will happen on the clients of the owner of this machine. Changing crystal density means an inconsistent abrasion on your client.

A few words on Application Handtool design. Handtools without removable Accelerators are not a good idea. The crystals that flow through these handtools are the second hardest mineral there is. Would you rather replace the accelerator or the complete handtool? Good thought, accelerators are cheap and easy to change.

Incident angle versus 90 degree direct particle. Think about it. Which imparts more energy into the target tissue? Correct, the direct hit will give the best abrasion and the most controllable abrasion, everytime. Evacuation system of the handset, single port or multiple ports, which will allow more interparticle collisions to happen at the abrasion site? Correct, if we can evacuate waste from all around the impact site there will be less interparticle collisions and more abrasion taking place. A clean hit on the tissue for each particle and a clean evacuation of all debris is the best design possible. Multiport evacuation is the best design for Handtools.

Good Luck and Good Selecting, Al Metcalf
Micro Tutorial 3