fa Measurement of mini-implant stability using resonance frequency analysis ارتودنسی Orthodontics پژوهشي Research <p> <strong>Objective:</strong>   </p><p> To investigate whether resonance frequency analysis (RFA) is suitable to measure orthodontic mini-implant stability. Implant size significantly affects the level of resonance frequency. Regarding the operating mode of RFA, it has to be proven whether the resonance frequency of mini-implants in bone fits the range of frequency emitted by the Osstell ISQ device. </p><p> <strong>Material and Methods:</strong>   </p><p> For this purpose the SmartPegs in the Osstell ISQ device were modified to fit with the inner screw thread of orthodontic mini-implants, and 110 mini-implants were inserted into porcine pelvic bone. RFA was performed parallel and perpendicular to the run of superficial bone fibers. A suitability test, Periotest, was also performed in the same directions. Compacta thickness was measured using cone-beam computed tomography. Correlation tests and linear regression analysis were carried out between the three methods. </p><p> <strong>Results:</strong>   </p><p> The RFA showed a mean Implant Stability Quotient value of 36.36 ± 2.67, and the Periotest mean value was −2.10 ± 1.17. The differences between the two directions of measurement were statistically significant (P > .001) for RFA and the Periotest. There was a high correlation between RFA and the Periotest (r  =  −0.90) and between RFA and compacta thickness (r  =  0.71). The comparison between the Periotest and compacta thickness showed a correlation coefficient of r  =  −0.64. </p><p> <strong>Conclusion:</strong>   </p><p> The present results suggest that RFA is feasible as a measurement method for orthodontic mini-implant stability. As a consequence, it could be used for clinical evaluation of current stability and allow stability-related loading of mini-implants to reduce the failure rate. </p><hr><p></p><p> <strong>Source: </strong>The Angel Orthodontists</p><p> <a href="http://www.angle.org/doi/abs/10.2319/043012-354.1" target="_blank"><font color="#0000cc">Full Text</font></a></p> Orthodontics, Skeletal anchorage, Implant stability, Resonance frequency analysis 0 0 http://idai.ir/browse.php?a_code=A-10-32-1937&slc_lang=fa&sid=1 Manuel Nienkemper Manuel.Nienkemper@uni-duesseldorf.de 10031947532846009086 10031947532846009086 Yes Department of Orthodontics, Heinrich-Heine-University, Düsseldorf, Germany Benedict Wilmes 10031947532846009087 10031947532846009087 No Department of Orthodontics, Heinrich-Heine-University, Düsseldorf, Germany Agamemnon Panayotidis 10031947532846009088 10031947532846009088 No Department of Orthodontics, Heinrich-Heine-University, Düsseldorf, Germany Alexander Pauls 10031947532846009089 10031947532846009089 No Department of Orthodontics, Heinrich-Heine-University, Düsseldorf, Germany Vladimir Golubovic 10031947532846009090 10031947532846009090 No Department of Oral Surgery and Admittance, Heinrich-Heine-University, Düsseldorf, Germany Frank Schwarz 10031947532846009091 10031947532846009091 No Department of Oral Surgery and Admittance, Heinrich-Heine-University, Düsseldorf, Germany Dieter Drescher 10031947532846009092 10031947532846009092 No Department of Orthodontics, Heinrich-Heine-University, Düsseldorf, Germany