What type of threads do tapered pro conical implants feature for primary stability?

• A. Fine threads
• B. Coarse threads
• C. Deeper buttress threads
• D. Spiral threads

Answer: (C)

Tapered pro conical implants feature deeper buttress threads to enhance primary stability. The design of these deeper buttress threads allows for greater engagement with the bone, providing a more secure fit within the implant site. This design is particularly important in achieving primary stability, as it helps to distribute forces effectively during the initial stages of healing and promotes osseointegration.

Deeper buttress threads are characterized by their more pronounced depth and geometry, which increases their surface area contact with the surrounding bone. This enhances the mechanical interlocking between the implant and bone, thus reducing the chances of micromovement and promoting early loading after placement.

In contrast, other types of threads, like fine or coarse threads, may not provide the same level of stability required for tapered implant designs. Fine threads may not engage enough bone surface, while coarse threads, although they offer additional grip, might not be as effective in the specific tapered design aimed at improving the conical concept in implants. Spiral threads are used primarily for achieving different mechanical properties but do not specifically cater to providing primary stability as effectively as deeper buttress threads in this context.