In 1997, which implant type was associated with an external hex system?

• A. Tapered implant
• B. Externally threaded implant
• C. Single-piece implant
• D. Internal hex implant

Answer: (B)

The external hex system is primarily associated with externally threaded implants. These implants have threads that extend outside the body of the implant, allowing for the retention of various components, such as abutments, through an external hexagonal connection. This design has been utilized in dental implant systems for many years and was common in the 1990s.

The tapered implant option refers to a design that gradually narrows towards the apical end and may or may not have an external or internal connection type. The single-piece implant consists of both the implant and the abutment in one continued structure, which also doesn't utilize an external hex connection system. Lastly, an internal hex implant features an interior hexagonal connection that secures components within the body of the implant rather than outside.

Thus, the connection style and its historical usage indicate that the externally threaded implant aligns with the external hex system utilized in implants from 1997.