Journal Article10.1111/J.1600-0501.2010.01983.X
Initial stability and bone strain evaluation of the immediately loaded dental implant: an in vitro model study
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TL;DR: The initial stability at the time of implant placement is influenced by both the cortical bone thickness and the elastic modulus of trabecular bone; however, these parameters are not totally linearly correlated with ITV, PTV, and ISQ.
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Abstract: Objectives: The aim of this study was to evaluate the effects of cortical bone thickness and trabecular bone elastic modulus on the strain in the bone surrounding an immediately loaded implant. We also examined the correlations between bone structure and the following indices of primary implant stability: insertion torque value (ITV), Periotest value (PTV), and implant stability quotient (ISQ).
Material and methods: The ITV, PTV, and ISQ were measured in 24 artificial jaw bone models representing cortical bone with four thicknesses (0, 1, 2, and 3 mm) and trabecular bone with four elastic moduli (137, 47.5, 23, and 12.4 MPa). Two loading conditions were applied (force of 130 N applied vertically and at 45° laterally), and the strains in the crestal region were measured by rosette strain gauges with a data acquisition system.
Results: When the cortical bone thickness and the elastic modulus of trabecular bone decreased, the bone strains increased by 10.3–52.1% and 39–73.1%, respectively, for vertical loading and by 35–62% and 42.4–56.2% for lateral loading. The cortical bone thickness has a stronger correlation (R2=0.95–0.71) with ITV, PTV, and ISQ than the elastic modulus of trabecular bone (R2=0.89–0.59).
Conclusions: The initial stability at the time of implant placement is influenced by both the cortical bone thickness and the elastic modulus of trabecular bone; however, these parameters are not totally linearly correlated with ITV, PTV, and ISQ. The placement of an immediately loaded implant in cases with thin cortical bone and/or weak trabecular bone can induce extreme bone strains and may increase the risk of implant failure.
To cite this article:
Huang H-L, Chang Y-Y, Lin D-J, Li Y-F, Chen K-T, Hsu J-T. Initial stability and bone strain evaluation of the immediately loaded dental implant: an in vitro model study.
Clin. Oral Impl. Res. 22, 2011; 691–698
doi: 10.1111/j.1600-0501.2010.01983.x
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References
Immediate Occlusal Loading of Brånemark TiUnite™ Implants Placed Predominantly in Soft Bone: 1-Year Results of a Prospective Clinical Study
Roland Glauser,Anna Lundgren,Jan Gottlow,Lars Sennerby,Michael Portmann,Petra Ruhstaller,Christoph H. F. Hämmerle +6 more
TL;DR: The applied immediate loading protocol in combination with a slightly tapered implant and a modified implant surface texture was shown to be a successful treatment alternative even in regions exhibiting soft bone.
Influence of the surgical technique and surface roughness on the primary stability of an implant in artificial bone with a density equivalent to maxillary bone: a laboratory study
TL;DR: A correlation was found between primary stability and bone density of the synthetic bone, implying that in case of an implant site with low bone density, by changing the surgical technique and choosing an implant with an optimal surface roughness, the primary stability can be enhanced significantly.
Critical review of immediate implant loading
TL;DR: From available literature, it may be concluded that anatomic locations, implant designs, and restricted prosthetic guidelines are key to ensure successful outcomes.
Implant stability and histomorphometry: a correlation study in human cadavers using stepped cylinder implants
Emeka Nkenke,Michael Hahn,Konstanze Weinzierl,Martin Radespiel-Tröger,Friedrich Wilhelm Neukam,Klaus Engelke +5 more
TL;DR: The resonance frequency analysis revealed more correlations to the histomorphometric parameters than the Periotest measurements, suggesting that the noninvasive determination of implant stability has to be improved in order to give a more comprehensive prediction of the bone characteristics of the implant site.
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Influence of implant design and bone quality on stress/strain distribution in bone around implants: a 3-dimensional finite element analysis.
TL;DR: The results of this study suggest that cancellous bone of higher rather than lower density might ensure a better biomechanical environment for implants, and longer screw-type implants could be a better choice in a jaw with cancellousBone of low density.