What is the correct position for a U15 instrument when removing cement?

The correct position for a U15 instrument when removing cement being perpendicular to the long axis of the tooth is appropriate because it allows for optimal access and effectiveness in the removal process. When the instrument is positioned this way, it can effectively engage the cement material while minimizing the risk of damaging adjacent tooth surfaces or gingival tissues. The perpendicular position helps to provide leverage and control, which can lead to a more efficient and thorough removal.

In the context of dental procedures, instrument positioning is crucial for ensuring that the practitioner can work safely and effectively, protecting both the patient and the dental work being performed.