Sybron Diagnostic Unit and Apex Locator
by Dr Anthony Boyden, Anthony Boyden & Associates, Penrith, NSW.
Despite never having too many problems with endodontics, a few years ago my associate and I decided to purchase an apex locator. I’m a 33-year dental graduate and the associate wasn’t too far behind but we thought it would be worth trying to improve our technique. I’m happy to say that’s exactly what has happened.
What’s good about it
When there are anatomical issues, such as overlapping roots or very dense overlying bone such as the zygomatic process and it’s difficult to visualise the apex, the locator is a great benefit. It’s also helpful when the apical foramen doesn’t coincide with the radiographic root apex. The apex locator confirms when you reach the true canal length even though it may look short on the radiograph.
Alternatively, if the root curves in the same plane as the X-ray beam, then the root can radiographically look 17mm long but actually be about 21mm long. This happens because the curve doesn’t show radiographically. In these cases, it would be easy to be well short of the apical foramen. This unit also allows electric vitality testing.
What’s not so good
It can be quite technique sensitive. If metal restorations are present, especially if access is through PFM or all gold crowns or amalgam restorations, it can throw off the reading. There are other technique issues but every once in a while, it gives false readings for no obvious reason. However, for the vast majority of days, it works fine and really complements your usual radiographic techniques.
Where did you get it
Henry Schein Halas.
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