Which complication of an implant-retained bridge is least likely to result in loss of the implant?

A fracture of the bridge is least likely to result in the loss of the implant because the bridge itself is a superstructure that is supported by the implants, serving primarily as a prosthetic restoration. While a fracture may compromise the functionality of the bridge and necessitate repairs or replacement, it does not directly affect the stability or integration of the implant within the bone.

In contrast, issues such as loosening of the implant or the presence of a pocket or localized pus are more serious complications. Loosening can suggest issues with osseointegration or mechanical failure of the implant connection, leading to potential loss. Similarly, the presence of a pocket around the implant can indicate periodontal disease or peri-implantitis, which poses a risk of bone loss and could ultimately compromise the integrity of the implant. Localized pus suggests infection, which can also lead to peri-implantitis and subsequent implant loss.

Therefore, while a fractured bridge may require intervention, it does not inherently jeopardize the implant's position, making it the least serious complication in this context.