Efficiency Considerations for the Purely Tapered Interference Fit (TIF) Abutments Used in Dental Implants
- 1 August 2004
- journal article
- research article
- Published by ASME International in Journal of Biomechanical Engineering
- Vol. 126 (4), 393-401
- https://doi.org/10.1115/1.1784473
Abstract
A tapered interference fit provides a mechanically reliable retention mechanism for the implant-abutment interface in a dental implant. Understanding the mechanical properties of the tapered interface with or without a screw at the bottom has been the subject of a considerable amount of studies involving experiments and finite element (FE) analysis. In this paper, approximate closed-form formulas are developed to analyze the mechanics of a tapered interference fit. In particular, the insertion force, the efficiency, defined as the ratio of the pull-out force to insertion force, and the critical insertion depth, which causes the onset of plastic deformation, are analyzed. It is shown that the insertion force is a function of the taper angle, the contact length, the inner and outer radii of the implant, the static and the kinetic coefficients of friction, and the elastic modulii of the implant/abutment materials. The efficiency of the tapered interference fit, which is defined as the ratio of the pull-out force to insertion force, is found to be greater than one, for taper angles that are less than 6 deg when the friction coefficient is 0.3. A safe range of insertion forces has been shown to exist. The lower end of this range depends on the maximum pull-out force that may occur due to occlusion in the multiple tooth restorations and the efficiency of the system; and the upper end of this range depends on the plastic deformation of the abutment and the implant due to interference fit. It has been shown that using a small taper angle and a long contact length widens the safe range of insertion forces.Keywords
This publication has 13 references indexed in Scilit:
- Mechanics of the taper integrated screwed-in (TIS) abutments used in dental implantsJournal of Biomechanics, 2005
- Mechanics of the tapered interference fit in dental implantsJournal of Biomechanics, 2003
- A Scale-Dependent Model for Multi-Asperity Contact and FrictionJournal of Tribology, 2003
- Morse-type tapersThe Journal of Arthroplasty, 2002
- U.S. Markets for Dental Implants 2001: Executive SummaryImplant Dentistry, 2001
- Implant abutment screw rotations and preloads for four different screw materials and surfacesThe Journal of Prosthetic Dentistry, 2001
- Application of finite element analysis in implant dentistry: A review of the literatureThe Journal of Prosthetic Dentistry, 2001
- The development of the ITI® DENTAL IMPLANT SYSTEMClinical Oral Implants Research, 2000
- In Vivo Bone Response to Biomechanical Loading at the Bone/Dental-Implant InterfaceAdvances in Dental Research, 1999
- On the Elastic-plastic Shrink Fit with Supercritical InterferenceZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 1990