Which of the following describes a potential failure method with bar overdentures?

The option regarding the use of improper screws identifies a potential failure method with bar overdentures because the integrity and stability of these restorations heavily depend on the correct use of components. In the context of bar overdentures, screws play a critical role in securing the prosthesis to the implants effectively. If improper screws are utilized, this could lead to inadequate retention, instability, or even mechanical failure of the overdenture.

Using the wrong type of screws, whether it be in terms of size, material, or threading, can compromise the connection between the overdenture and the supporting implants. Therefore, ensuring that the appropriate screws are selected and correctly placed is vital for the longevity and effectiveness of bar overdentures. This aspect directly relates to the mechanical stability of the prosthetic and is a common consideration during the planning and execution stages of treatment.

On the other hand, while poor esthetics, implant rejection, and dental caries could also be concerns in the context of dental restorations, they do not specifically pertain to the mechanical failure aspects associated with the hardware and retention systems of bar overdentures like improper screws do.