The osseointegration stimulatory effect of macrogeometry‐modified implants: a study in the rabbit

Abstract

The modified implant macrogeometry with microthreads in between promoted effect in the femur. However, no statistical differences could be seen in the tibia, suggesting that the modification may be more effective in bone with poor bone quality, such as in the maxillary bone.

Influence of Micro Threads Alteration on Osseointegration and Primary Stability of Implants: An FEA and In Vivo Analysis in Rabbits

“…After 4 weeks, all the implants of the nine rabbits in which ITQ was measured were subjected to RTQ test using an electronic device, with a special connector. A device used for many years as a standard technique and is described in our previous publications . The instrument was connected to the implants, and a fixed rotation rate of reverse torque was applied until failure of the bone‐implant interface occurred.…”

“…A device used for many years as a standard technique and is described in our previous publications. 23,24 The instrument was connected to the implants, and a fixed rotation rate of reverse torque was applied until failure of the bone-implant interface occurred. The peak values of resistance to reverse torque rotation were recorded Ncm.…”

“…In our previous study, a prototype implant with micro threads in between macro threads was designed with turned surface; results showed that micro threads designed in between the macro threads promoted early bone stimulation in the femur. 23 Hence, in order to further enhance osseointegration, the present study was aimed to evaluate the early bone tissue response to micro threads designed to the full length of the oxidized titanium implant between the macro threads, by reducing the depth of the macro threads, thus increasing the initial contact of the micro threads with the bone. In addition, oxidized surface was used to make the implant surface isotropic in this present study.…”

Evaluation of the effect of self‐cutting and nonself‐cutting thread designed implant with different thread depth on variable insertion torques: An histomorphometric analysis in rabbits

“…The shallower the thread depth, the easier the implantation procedure, especially in the high density bone. 9,10 For immediate loading protocols, a high degree of primary stability, postulated to apply an insertion torque of 30 Ncm, 11 A comparison of osseointegration at implants installed with high or low insertion torques has been presented in animal experiments. On the contrary, deep threads increase the functional surface area at the bone-implant interface, which can improve primary stability in the low-density bone or the region with high occlusal load.…”

“…On the contrary, deep threads increase the functional surface area at the bone-implant interface, which can improve primary stability in the low-density bone or the region with high occlusal load. 9,10 For immediate loading protocols, a high degree of primary stability, postulated to apply an insertion torque of 30 Ncm, 11 was considered as a prerequisite. It is considered highly desirable that this level of stability should be as high as possible.…”