We have already highlighted how important the mechanical characteristics of implants are and how much they depend on the elastic modulus of titanium.
From this concept the choice to construct the L-type implant in Titanium grade 4 depends directly. Thus, greater resistance was obtained to the negative factors that occur at the time of a deformation induced by the loads. Now let’s see how a solid reacts (implant, which has a constraint (osseointegration) with the anatomical bone area. Applying an occlusal force, we say “Eulerian critical load” that compression force whose value indefinitely inflects the lean solid it acts, generating instability at peak load.
So the more a plant is deformable, the more sensitive it is to this phenomenon. This should not be considered solely as a geometric deformation but also as a vectorial discharge of the forces that change the starting tension state leading to the typical conoid reabsorption.
We have already said that the critical load produces peak instability that induces the clinically described bone modifications.
The tensions that critically concentrate on the intracortical passage section and on the apex of the implant lead the bone to react in a catabolic sense when they reach values and directions that are not tolerable. The near flexion is the main responsible for this altered tensional state.
We therefore define the buckling at peak load.
The buckling load is a compressive stress applied to the head of a rod, for example a pillar or beam stuck at one end and hinged in the other characterized by considerable slenderness (ratio between length split diameter).
The phenomenon of buckling at peak load, also called Eulerian instability or Eulerian instability, must be avoided with great care, as it is disastrous.
To guard against this phenomenon, project loads and soliciting actions must be correctly predicted, modifying the parameters of the project. For example:
• reducing compression;
• trying to reduce the eccentricity of the load;
• increasing the area of the section;
• reducing the length of the object;
• adding constraints with other nearby auctions
• reducing the free inflection length of the beam
It is evident that our complex implantation system leads the sub-units functional units (plant plus bar) to react totally differently from the single Rootform plants considered as such. We will see in the next chapter how it is possible, through modern methodologies, to find the correspondence to the over-stated principles. The possibility through the calculation method of the finite elements to detect the stress state of the examined structures allows us to appreciate not only the difference but also the superiority of behavior of the solidarized structures in the short but also in the long term.