Locating Isthmus Areas
![](https://helseus.com/wp-content/uploads/2017/03/Header-Icon-Pulp-Chamber-3-150x150.png)
Ultrasonics makes locating and cleaning Isthmus precise.
Failing to locate and treat canal anatomy can contribute to persistent infection and postoperative sequelae. Isthmuses are narrow anatomic areas that connect two root canals. Vital or necrotic pulp can remain in an isthmus if left untreated. Instrumentation of an isthmus with burs can result in excessive removal of tooth structure and iatrogenic ramifications. The concomitant use of ultrasonics and magnification facilitates precise and selective cleaning of isthmus areas.
![<img src= "Illustrations-Cleaning-Isthmus-4.png" alt="Step 1 in Locating Isthmus Areas">](https://helseus.com/wp-content/uploads/2017/03/Illustrations-Cleaning-Isthmus-4-300x300.png)
1. Canals after instrumentation with files.
![<img src="Illustrations-Cleaning-Isthmus-5.png" alt="Step 2 in locating isthmus areas">](https://helseus.com/wp-content/uploads/2017/03/Illustrations-Cleaning-Isthmus-5-300x300.png)
2. The ultrasonic insert must touch all isthmus walls.
![<img src= " Illustrations-Cleaning-Isthmus-6.png" alt="Step 3 in locating isthmus areas.">](https://helseus.com/wp-content/uploads/2017/03/Illustrations-Cleaning-Isthmus-6-300x300.png)
3. Clean isthmus area.