and 3 other(s)
Background & purpose: Implant stability is one of the most important factors influencing osseointegration. Using stereolithographical guides for maximizing precision, this study aimed at investigating the relationship between implant stability and bone density derived from CT (Computerized Tomography) analysis. Materials & methods: 195 implants were placed in 48 patients using digitally designed stereolithographical surgical guides. 95 implants were placed using a mucosa supported guide and 100 implants were placed using a bone supported guide. Implant stability was measured by means of Resonance Frequency Analysis (RFA) and damping capacity assessment (Periotest, PTV). Bone density (Hounsfield units) was measured at different ROI (regions of interest) and cortex thickness was measured around each implant. Results: Implant stability correlated significantly with the different ROI. The best correlation for RFA was obtained for the spongious bone ROI (r = 0.64) and PTV best correlated with the coronal cortex density (r = -0.41). Shorter implants (9 mm) had a significantly lower primary stability than longer implants (11, 13, 15 mm). Primary stability was also significantly higher in 4mm diameter implants than in 3.5mm diameter implants. A formula for the prediction of primary stability based on the different variables investigated was developed. Conclusions: Bone density and cortex thickness have a significant influence on implant primary stability. Longer and wider implants reached higher primary stability than shorter and narrower implants. These correlations lose their significance after osseointegration has taken place. Implant stability can be predicted based on an pre-operative analysis of bone characteristics.
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