CST LINK:
PRODUCT PRESENTATION AND CONCEPT
Characteristics of the CST Link
The CST Link system enables rapid and precise recording of the spatial positioning of the implant abutments.

A braid of hybrid glass-resin CST Link can be cured under blue light according to a protocol based on winding around the implant posts.

The CST Link hybrid braid is composed of an external sheath of woven glass threads containing glass threads arranged lengthwise. These threads are composed of an assembly of 9µm long glass fibers with good structural dimensional stability.

The resin wetting each fiber of each thread represents only 6% of the mass of therefore its contraction after polymerization remains extremely slight and undetectable (less than 0.06 %)

Spatial stability tests were carried out on a CST Link type fiber-reinforced structure, coated with translucent silicone and polymerized on four posts, using a profile projector and doubled with 3D camera measurements : an average deviation of gap of 0.07% (between posts 1 and 3) were observed, which correspond to a gap of 19µm. Plaster control keys, built on a model replica remained free of fractures and cracks, demonstrating the perfect passivity of the structures.

CST LINK

Is the structure rigid enough to enable osseointegration ?

Osseointegration occurs when micromotion is between 50 and 150µm but is this motion truly quantifiable between these two values with a stiff unelastic metal connection in a context of complex deformation of bone parts related to the type of bone and the geometry of the bone parts? Has it been proved that an excessive stiffness is not actually harmful in this fluctuating context (dentistry based on proof )?

It is often suggested that a stiff connection would enable better distribution of strain over the implants. However, the word “distribution” is ambiguous : each implant would be under stress from different forces and dependent on the point of application of the force. Furthermore, the amount of effort on each implant would depend on the section of the rigid metal bar (modulus of inertia of the section). In the case of effort on a distal extension, the adjacent implant would be “stamped” on the bone and serve as a “pivot” and the other implants would be under extraction strain by swinging of the bar around the pivot implant.

Mechanically, the bars would not, depending on their profile (some are tall and narrow with a high modulus of inertia-the height has a huge effect), bend or only slightly, but the force on the most distal implant would be the same as for a more flexible CST framework. However, it can be said that the application of forces would be immediate in the case of a stiff system of CST : the overlapping of the braids can be likened to a system of springs (a fiber-reinforced compound cannot suffer permanent deformation) since the resin acts as a shock absorber and the assembly as a whole absorbs the strain (dashpot).