Assessment of the correlation between bone density and implant stability

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The objective of this study was to determine the correlation between bone density and implant stability, using computed tomography (CT) and resonance frequency analysis (RFA). We examined a total of 97 implants in 12 patients. CT was used to determine the bone density at each implant recipient site in Hounsfield units (HU). After implant placement, RFA measurements were immediately performed with an Osstell instrument, and RFA values were recorded as implant stability quotients (ISQ). Bone density values ranged from 328 to 1184 HU. ISQ ranged from 48 to 80. The mean bone densities and RFA values of all 97 implants were 689.61±173.76 HU and 66.08±6.81 ISQ, respectively. A positive correlation between RFA values and bone density was found for all four regions, with the posterior maxilla yielding a correlation of r=0.603, posterior mandible r=0.622, anterior mandible r=0.834, and anterior maxilla r=0.838. Our data confirm the correlation between ISQ and bone density.


Bone density; computed tomography; implant; primary stability

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