Evaluation of Osseointegration of Dental Implant with and without Primary Stability: An Experimental Study of Sheep

Diyar Maghdid Kheder

Hawler Medical University



Primary implant stability is regarded as a prerequisite for reaching and maintaining osseointegration. the objective for doing this study was to check the amount of osseointegration of the dental implant when placed with and without primary stability, clinically, radiological, adn histologically.



The experimental study includes four male sheep wwith a weigth mean of 40 to 60 kgs in weight and 2 to 4 years old. forty implant placed, divided into two groups, 20 implants without primary stability. after intramuscular sedation and local anesthesia, the implant site performed in the inferior border of the basal bone of mandible drilling to 4.3 mm in diameter and 8 mm in length. Forty implants were inserted, 20 implants in the study group (3.3 mm diameter and 8 mm length) and 20 implants placed in a control group (4.3 mm diameter and 8 mm length), after 4 months the 4 sheep were sacrificed and universal torque ratchet and perio test was used to measure the stability of the implanys clinically. Radiologically Cone Beam Tomography (CBCT) was taken using ImageJ software for measuring density in both groups. Histologically also ImageJ software used for measuring thread width, the distance between threads and amount of cortical bone at bone-implant contact.


Non-significant difference between both groups. Fort implants succesfully tolerated a 30N/cm reverse torque test and the results of the perio test were non-significant. Cone Beam Tomography (CBCT) showed no sign of bone radiolucency, and the density result was non-significant. Histological evaluation confirmed the formation of bone around dental implants in both groups and ImageJ software measurement showing no significant difference between study and experimantal groups in depth of threads, the distance between threads and amount of cortical bone in the area of bone-implant contact.



Dental implans had the same chance to ossseointegrate in the absence of primary stability at three months follow up.



  • AIM Academy - Always Implantology
    Rue Mercerie 12
    CH-1003 Lausanne
  • Phone : +41 78 721 27 40
    E-Mail :