Abstract
The purpose of this study was to evaluate the effect of early functional loading to plateaued implants on bone formation and implant stability in a dog model. Early loading (EL), nonloading control, and delayed loading (DL) groups were compared using six beagle dogs under functional loading. The Periotest® values were measured dynamically for 6weeks. Peri-implant bone architecture was evaluated qualitatively by microcomputed tomography (μCT) and analyzed quantitatively by mineral apposition rates (MAR), bone-to-implant contact (BIC), and bone volumes (BV/TV) after the euthanasia at 3 and 6weeks after loading. The EL implants showed poor stability at 1week, but greater stability at 2 and 4weeks after loading compared to DL implants. There was no significant difference between MAR of EL and unloaded implants at both time intervals. The EL implants displayed a significantly higher MAR when compared to DL implants at 3-5weeks. A significantly higher BIC for the DL group was observed when compared to the EL group at 3weeks following loading, however at 6weeks; no significant difference between these groups was observed. The EL group gained a higher BIC than the no-treatment control group at 6weeks. For plateaued implant, the decreased healing time (1week) displays a positive effect on peri-implant bone (re)modeling under functional loading during the early phase. The early application of functional loading on plateaued implants can be used clinically to shorten the course of treatment and improve esthetics.
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