What improvement was made to the screw design in external hex implants?

• A. Broader head design
• B. Increased length
• C. Increased external hex height
• D. Weaker material

Answer: (C)

The improvement made to the screw design in external hex implants, specifically the increased external hex height, enhances the overall stability and retention of the implant. A higher hex allows for a better fit and engagement with the implant abutment, which can significantly improve the mechanical stability of the restoration. This design adjustment mitigates the risk of screw loosening and enhances the torque distribution, thus providing a more secure connection to the prosthetic component. By increasing the height of the external hex, manufacturers aim to create a more robust and reliable interface between the implant and the superstructure, leading to better clinical outcomes for patients.

In contrast, broader head designs, increased length, or using weaker materials do not contribute to improving the functionality and performance of the implant in the same way. While these factors might be relevant in other contexts or products, the specific focus on enhancing the external hex height directly impacts the stability and efficacy of external hex implants.