What is the effect of aluminum chloride in the retraction cord?

Aluminum chloride is an effective hemostatic agent commonly used in retraction cords during dental procedures. Its primary effects are to control bleeding and to shrink the surrounding gingival tissue. When aluminum chloride is applied, it acts by causing vasoconstriction and inducing local tissue shrinkage, which helps to minimize bleeding during procedures like crown preparations. This controlled bleeding is crucial, as it allows for better visibility and access to the tooth structure and ensures that the area remains clean and free from blood during impressions.

While other options may suggest various effects, such as increasing tissue size or expanding the gingival sulcus, these do not align with the established clinical uses of aluminum chloride. The main benefit of aluminum chloride is its ability to effectively reduce bleeding while also compacting the tissue, making it easier for dental professionals to work accurately and efficiently. Therefore, the choice related to controlling bleeding and shrinking tissue accurately reflects the role of aluminum chloride in retraction cords.