Which instrument can be used to invert the rubber dam material into the sulcus to ensure a seal around the gingiva?

The instrument with a flat blunt working end is designed specifically for manipulation of rubber dam material. This type of instrument allows the dental assistant to gently invert the rubber dam into the sulcus, creating a secure seal around the gingival margin. This is crucial for preventing moisture from contaminating the operative field during dental procedures, as it helps create a dry and isolated environment.

Inverting the rubber dam material is essential in procedures like restorative work, where moisture control is key to the success of materials such as composite resins or dental cements. The blunt end of the instrument provides adequate leverage without the risk of tissue trauma, making it both effective and safe for the patient.

Other tools, while useful for various tasks in oral surgery and dentistry, do not possess the design or versatility needed to effectively invert and seal the rubber dam in the gingival sulcus. A scalpel, for instance, is primarily used for cutting and could cause injury if used for this purpose. A mirror aids visibility but does not provide the physical action needed to manipulate the rubber dam. Similarly, a periodontal probe is intended for measuring pocket depth and assessing periodontal health, rather than adjusting the dam material for optimal placement.