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Three critical size circumferential defects were prepared in the ilium of six sheep. Three dental implants were placed into the centre of each defect and the 3.25?mm circumferential gap was filled with (a) blood clot alone; (b) ��-TCP; (c) rhPDGF-BB (0.3?mg/ml) with ��-TCP. All the defects in each group were covered with a Bio-Gide? resorbable barrier membrane. The sheep were sacrificed at 2 and 4?weeks and histological and histomorphometric analyses were performed to determine the percentage of new mineralized bone formation and residual ��-TCP graft particles in [http://www.selleckchem.com/products/incb28060.html Protein Tyrosine Kinase inhibitor] the defects. Defects filled with rhPDGF-BB/��-TCP showed the highest rate of bone formation after 2 and 4?weeks with limited degradation of the ��-TCP particles over 4?weeks. Defects filled with ��-TCP showed the least bone fill after 2 and 4?weeks, and faster degradation of the ��-TCP particles over 4?weeks compared with defects filled with rhPDGF-BB/��-TCP. Percentage of new mineralized bone was comparable in defects to blood clot alone and ��-TCP after 4?weeks of healing, but there was a collapse in the defect area in defects with blood clot alone. In comparison, the space was maintained when ��-TCP was used in defects at 4?weeks. Defects which had ��-TCP alone showed an inhibition in bone healing at 2 and 4?weeks; however, [http://www.selleckchem.com/products/gdc-0068.html http://www.selleckchem.com/products/gdc-0068.html] the combination of rhPDGF-BB with ��-TCP enhanced bone regeneration in these peri-implant bone defects at the same time intervals. ""The purpose of this animal study was to radiologically measure the influence of abutment disconnection on bone resorption and to compare this influence on platform-switched vs. non-platform-switched implants. The study design included extraction of all mandibular premolars in five canines . After 2 months, six implants were placed in each dog. Four of them were platform-switched (PS) implants and two were non-platform-switched (NPS) implants. Some or all of the abutments connected to the implants were disconnected at pre-ordained post-surgical intervals. Radiographs were taken at the time of implant placement and at every handling. The values for mesial (horizontal and vertical) and distal (horizontal and vertical) bone resorption were taken and compared for each implant at every abutment dis/reconnection. The average vertical bone resorption around NPS implants after four [http://en.wikipedia.org/wiki/Isotretinoin Isotretinoin] dis/reconnections was 1.09?mm (SD 0.25?mm), and the average horizontal bone resorption was 0.98?mm (SD 0.27?mm). The average vertical bone resorption around PS implants after four dis/reconnections was 0.24?mm, (SD 0.08?mm) and the average horizontal bone resorption was 0.24?mm (SD 0.13?mm). The difference of the average horizontal and vertical bone resorption around NPS (site D) and PS (site A) implants was statically significant (P?