Related Experiment Video
Updated: Aug 24, 2026

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Influence of implant length and bicortical anchorage on implant stress distribution
Laurent Pierrisnard1, Franck Renouard, Patrick Renault
1Faculty of Dental Surgery Montrouge, University of Paris V, Department of Prosthetics, Paris, France. laurent.pierrisnard@wanadoo.fr
Background:
Short implants present superior failure rates for everybody.
Purpose:
The aim of this theoretic study was to assess to what extent implant length and bicortical anchorage affect the way stress is transferred to implant components, the implant proper, and the surrounding bone.
Materials And Methods:
Stress analysis was performed using finite element analysis. A three-dimensional linear elastic model was generated. All implants modeled were of the same diameter (3.75 mm) but varied in length, at 6, 7, 8, 9, 10, 11, and 12 mm (Brånemark System, Nobel Biocare AB, Gothenburg, Sweden). Each implant was modeled with a titanium abutment screw and abutment, a gold cylinder and prosthetic screw, and a ceramic crown. The implants were seated in a supporting bone structure consisting of cortical and cancellous bone. An occlusal load of 100 N was applied at a 30 degrees angle to the buccolingual plane.
Results:
With the selected model and bone properties, the coronal cortical anchorage was dominating, and the bone stress concentrated to that area.
Conclusions:
The maximum bone stress was virtually constant, independent of implant length and bicortical anchorage. The maximum implant stress, however, increased somewhat with implant length and bicortical anchorage.
Related Concept Videos
Flexural Stress
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
Eccentric Axial Loading in a Plane of Symmetry
Stress: General Loading Conditions
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.
Stress Concentrations
Stress Concentrations
The stress concentration...
Bearing Stress
Due to the intricacy of these microforces, an average value, known as bearing stress, is often used by...
