Microthread Concept in Dental Implants

One of the most important issues affecting the success of the dental implants is to preserve the bone around the implant fixtures. There are many investigations made by researchers or manufacturing companies to ensure that the stress occurred around the implant could be distributed to the bone in most favorable manner. For this purpose macro and micro thread designs of the implants have been altered. An implant design should reduce the stress in the bone as well as should serve as a stimulant for bone regeneration. Excessive stress may cause bone resorption around the implants, on the contrary, lack of stress may lead to bone tissue atrophy around the fixtures. The collar of the implants are generally designed as not to carry loads but to reduce plaque accumulation and to transmit the forces to the implant body by acting as an interface. However, recently many authors concurred that the use of micro-threads in the neck region of the implants could be an efficient way to organize the transmitted stress through the cortical bone. Comparing with the standard threads, micro threads are accepted to increase axial stiffness of the implant and to decrease shearing stresses in the cortical bone