When Is It Time to Replace Instruments?

Dear Maureen, Whether instruments are new or old, the need for sharpening is based on use and is not related to the sharpening method. From what you describe as the practice setting, I''m not surprised by your need to sharpen frequently. Several things can be occuring such as:

1. If the instruments are not rotated back to the same operatory or same hygienist, you may be sharpening the other hygienists instruments along with yours. Also if the other hygienists are not sharpening their instruments on a regular basis, then it does require a significant reduction in metal to get an extremely dull instrument sharp.
2. Some of the older metals may have dulled slightly during the sterilizing process, but I don''t think that is the case as your instruments are fairly new.
3. Green burs sharpen instruments quickly and can reduce the working end much quicker than hand held stones if too much pressure is applied. However it sounds like you are aware of your technique and keep the pressure to a minimum.

Unfortunately, there is no single formula for the need to sharpen or replace instruments as it will vary from practice to practice and is soley based on use. Examine your instruments carefully to see if they are thinning across the face of the blade or thinning from face to back. As instruments thin in those areas, the risk of breaking becomes greater. One suggestion I can make is to investigate the new blade technology that is being used by some instrument companies. There is a process during manufacturing that keeps the edge sharp for a longer period of time. It will cost a few more dollars per instrument, but it may save money in the long run as you may not need to replace instruments as frequently. I feel your frustration, yet there is no easy answer. I guess instruments can be like shoes... wear depends on frequency of use!