In what rotary direction should the bond be removed from the upper right and lower left?

The correct rotary direction for removing the bond from the upper right and lower left is mesial-distal. This approach is important as it aligns with the natural contours and orientation of the teeth. Removing the bond in a mesial-distal direction helps to ensure that the force applied is directed along the long axis of the tooth, promoting effective removal without causing damage to the enamel or surrounding tissues.

In addition, the mesial-distal direction allows for better visibility and access to the bonding material, especially in the posterior sections of the mouth where such procedures commonly occur. This technique can help minimize stress on the teeth and improve the overall efficiency of the bonding removal process.

The other directions may not provide the same level of access or could potentially put undue stress on the structures involved. For example, moving in a distal-mesial direction could complicate the removal process, while an incisal-cervical approach might not be suitable for maximizing effectiveness in these areas. Buckal-lingual movements may also not be appropriate due to the orientation of the bond and the potential for damaging adjacent structures. Thus, mesial-distal is the most appropriate technique in this context.