This study was conducted to evaluate bone-to-implant contact (BIC) of loaded and control miniscrew implants (MSI). Using seven skeletally mature male beagle dogs followed over a 110 day period, a randomized split-mouth design compared (1) delayed vs. immediate loading (25g) in the maxilla and (2) 25 vs 50g forces in the mandible. Mobility was evaluated using a 0-3 point scale before the MSIs were prepared for histological analysis. Histomorphometric analyses were performed under light microscopy using Metamorph ® software on undercalcified sections. Percent bone-to-implant contact (BIC) was measured at three levels of the MSI (coronal, middle, and apical). Mobility was detected on 3 of the 56 (5.4%) MSIs. The mobile implants were all unloaded controls and showed no BIC. All of the remaining, stable, MSIs showed BIC. However, variation in BIC was large, ranging from 2.2% to 100%. There were no significant (p>0.05) differences in BIC associated with timing of force application, amounts of force applied, or implant location. There was a tendency for less BIC at the coronal level, but the differences between levels were not statistically significant. Within the limits of this study, we conclude that neither the timing, amount of force, nor location affect BIC. Moreover, it appears that only limited amounts of osseointegration are necessary to ensure implant stability.
|School:||The Texas A&M University System Health Science Center|
|School Location:||United States -- Texas|
|Source:||MAI 46/02M, Masters Abstracts International|
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