What shank type is used for the removal of very tenacious calculus?

The choice of an extra rigid shank for the removal of very tenacious calculus is based on its structural integrity and strength, which allow for effective and efficient scaling of tough deposits. When calculus is especially hard and adheres firmly to the tooth surface, a more rigid instrument provides the leverage needed to break it free.

In contrast, a rigid shank offers some flexibility, but may not provide the necessary force to remove very stubborn calculus effectively. A moderately flexible shank is designed to adapt to contours and reduce trauma to the surrounding tissues, making it less effective against highly resilient deposits. A flexible shank bends easily, which is suited for lighter deposits or for scaling in sensitive areas, but it lacks the strength required for the removal of tenacious calculus.

By employing an extra rigid shank instrument, the dental hygienist can apply more controlled pressure, enhancing the effectiveness of the scaling process and minimizing the risk of instrument breakage that can occur with less rigid options. This ensures better patient outcomes with cleaner tooth surfaces and a reduction in the likelihood of periodontal issues related to retained calculus.