RESUMO
PURPOSE: The aim of this study was to evaluate the in vivo effect of TAK-778 on osseointegration of titanium implants. MATERIALS AND METHODS: Mandibular premolars were extracted from 8 dogs. After 3 months, 2 titanium implants were bilaterally placed, and each implantation site randomly received 1 of the following treatments: sustained-release microcapsules of TAK-778, placebo microcapsules, or no treatment. At 8 and 12 weeks after implantation, the hemi-mandibles containing the implants were removed, and processed for morphologic and histomorphometric analysis. Data were submitted to 2-way analysis of variance. RESULTS: The histologic sections of the 3 experimental groups at 8 and 12 weeks did not show morphologic differences related to applied treatment. The percentage of bone-implant contact, mineralized bone matrix between implant threads, and mineralized bone matrix within mirror area were not affected either by treatments or evaluated periods. CONCLUSIONS: No effect of TAK-778 was observed on osseointegration of titanium implants, which most likely occurred because microcapsules may not be retained and, therefore, available at the implant sites. An alternative is the manufacture of a release system, which can be immobilized on implant surface, ensuring the drug permanence in the implant site at least at the initial periods of bone formation.
