What was a primary reason for switching from external hex to internal hex in dental implants?

• A. Increased cost of production
• B. Less micromovement
• C. Compatibility with more dental tools
• D. Improved aesthetic results

Answer: (B)

The transition from external hex to internal hex design in dental implants primarily aimed to reduce micromovement. Internal hex implants provide a more secure connection between the abutment and the implant body, which minimizes the potential for movement that can occur under functional loading. This reduced micromovement enhances the stability of the restoration, allowing for better osseointegration and a lower risk of complications, such as screw loosening or fractures, that can be associated with greater micromovement in external hex designs.

In contrast, other factors listed, such as cost implications, compatibility with dental tools, and aesthetic results, are secondary considerations. While these aspects may influence implant choice, the increased stability and improved resistance to micromovement were pivotal in promoting the adoption of internal hex designs among dental professionals. This innovation reflects a clear understanding of the mechanical stresses involved in dental restorations and the need for designs that support long-term success.