Efficiency Considerations for the Purely Tapered Interference Fit (TIF) Abutments Used in Dental Implants

[+] Author and Article Information
Dinçer Bozkaya, Sinan Müftü

Northeastern University, Department of Mechanical Engineering, Boston, MA 02115

J Biomech Eng 126(4), 393-401 (Sep 27, 2004) (9 pages) doi:10.1115/1.1784473 History: Received October 13, 2003; Revised January 23, 2004; Online September 27, 2004
Copyright © 2004 by ASME
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Various implant-abutment attachment methods are used in commercially available dental implants. (a) screw only; (b) and (c) TIS; (d) TIF type attachment methods
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(a) Definition of the design parameters of the tapered interface. (b) The free body diagram of the tapered abutment depicting the force balance during insertion.
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The distribution of the radial and circumferential stresses in the abutment and the implant at different axial (z) locations
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The insertion depth as a function of work of insertion. Experimental results of O’Callaghan et al. 16 represented by the curve fit formula, Δz=1.55×10−2Wi0.579 are compared with the results of this work calculated for the base parameters of Bicon system.
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The critical insertion depth Δzp, which causes onset of plastic deformation as a function of (a) bottom radius of the abutment rab for different taper angles θ, and (b) implant outer radius b2 for different rab values. The other parameters, which are fixed, are reported in Table 1.
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The variation of the efficiency of the attachment with respect to different parameters. θ, μ and μks are the significant parameters affecting the efficiency of the attachment. The other parameters, which are fixed, are reported in Table 1.
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Variation of pull-out Fp and insertion Fi force with (a) taper angle θ, (b) contact length Lc, (c) coefficient of friction, and (d) ratio of kinetic to static friction coefficient. The other parameters, which are held fixed, are reported in Table 1.
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The pull-out force Fp as a function of insertion force Fi, for different contact lengths Lc and taper angles θ.




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