What part of the clamp should the rubber dam be stretched over first?

The correct answer emphasizes the importance of starting with the bow of the clamp when placing a rubber dam. The bow is the curved portion of the clamp that is positioned towards the occlusal surface of the tooth. Stretching the rubber dam over the bow first allows for easier manipulation and positioning of the dam around the teeth being isolated. This approach helps to ensure that the dam is properly secured and that the clamp maintains stability.

When the rubber dam is anchored to the bow first, it provides a solid foundation for subsequently stretching it over the other parts of the clamp, allowing for a more effective isolation of the tooth or teeth involved in the dental procedure. Additionally, this technique can help prevent the dam from slipping or becoming dislodged during treatment, which is crucial for maintaining a dry working field and preventing contamination.