When using a rotary instrument to remove bond, how should the instrument be held?

When using a rotary instrument to remove bond, holding the instrument parallel to the long axis of the tooth is the optimal approach. This technique allows for better control and precision during the bonding removal process, minimizing the risk of damaging surrounding tooth structures and ensuring effective removal of the bond material.

Maintaining the instrument parallel to the long axis helps in adequately aligning the cutting edge with the surface of the tooth, providing an even and efficient removal of the bonding agent without excessive pressure or awkward angulation that could lead to injury or uneven surface texture. It facilitates a more natural and comfortable hand position for the dental assistant or dentist, promoting better ergonomics during the procedure.

The other options would not provide the same level of control or effectiveness. For instance, holding the instrument at a 45-degree angle or angled towards the mesial side could lead to uneven removal or unintended damage to adjacent teeth or tissues. Keeping the instrument perpendicular to the tooth surface might result in less precise removal, possibly leaving residual bonding material or affecting the tooth's surface integrity. Thus, parallel alignment is the best practice in this scenario.