Which finger primarily supports the shank in a modified pen grasp?

In a modified pen grasp, the middle finger plays a crucial role in providing stability and support to the instrument's shank. This grasp technique is commonly used in dental procedures, as it offers better control and maneuverability. The middle finger rests against the instrument's shank, allowing the dental professional to articulate more effectively while performing tasks such as coronal polishing.

The placement of the middle finger against the shank helps to stabilize the instrument, which is especially important during precision tasks that require a steady hand. The index finger and thumb are useful for gripping the handle, but they do not provide the support to the shank that the middle finger does. A well-established modified pen grasp, including the position of the middle finger, allows for a more ergonomic approach, reducing hand fatigue and improving overall technique.