Magitech Implant Characteristics

Other implants have notably a time consuming inconvenience when placing the implant and present a number of difficulties during the insertion such as the anchoring which became rather difficult because of bone volume and quality.         Besides, these implementation-related difficulties facilitate bone heating and equally influence on implant stability and healing quality. Moreover, as bones become more fragile as does the risk of fracture. In other words, a long surgery with numerous drills implies an overheated bone and hence a more difficult healing. Likewise, proportions of bone volume, especially the width of the bone ridge which is often too narrow, may require a transversal bone expansion using a bone graft and a manual bone expander or contra-angles to lengthen the break time.

INVENTION REPORT

          Magitech Implants – M2I aim to address the disadvantages of the surgical placing of an implant by presenting a dental implant that is capable to assure a reduced break time and an enhanced quality of implantation for all bone types by putting aside the use of bone grafts and other expanding techniques. Altogether, M2I allow for an increased stability of the implant. Because of its      double conical shape:

-     The first relative nominal conicity with a tronconical-shaped anchorage body presents a defined lateral surface such as a tronconical envelope that is delimited by the threads’ summit and which angle is comprised between 1^o and 15^o;

-     The second relative conicity with a tronconical-shaped anchorage body presents a defined lateral surface such a tronconical envelope delimited by the threads’ crests and which angle is comprised between 5^o and 20^o;

 And its narrow apical diameter:

·         The apical part consists of an apex nominal diameter comprised between 1mm and 3mm for an implant diameter comprised between 3.3mm and 5.2mm and a threading which threads are angled between 50^o and 54^o.

          Therefore, such device presents the advantage of being self-tapered and expander at the same time. In fact, this self-tapered effect is due especially to the double conicity of the anchorage body while the expander effect is in part possible due to the angle variations of the threads as well as the important double conicity. This also allows for a much easier insertion of the implant into the bone and hence reducing the time and improving the healing.

The implants also allow for a conspicuously instant stability when in place. It is also possible to correct the direction of an implant during the insertion in the bone to favourably guide it along the prosthetic axis; i.e the axis that is capable of receiving the implant or even better to align it with another implant. In this latter case, a known handle for this technique may be used to assist the placement of this implant in order to align it.

            Beneficially, the threading on the anchorage body comprises an increasing depth of threads as it goes away from the support head and is comprised between 0.6mm and 0.7mm at the apical part. This depth of threads is more precisely defined as the distance between the crests and the summits of these threads.

          Furthermore, according to another characteristic, the support head is relatively cylindrical and includes a fairly circular upper surface and a lateral surface with a stabilizing threading that is capable to stabilize bone expansion after blocking the implant. Threads are separated by a 0.10mm to 0.50mm distance.

          According to a special feature, the implant is composed of a titanium alloy grade V which enhanced its mechanical qualities.

Surgical placement of the Magitech Implant – M2I comprises the following steps:

           -                   First, using a round bur of 0.5mm diameter makes a pre-hole along the desired axis;

           -                   Place the first drill of 1.5mm diameter according to the length of the implant then a second drill of 2mm nominal diameter to finish the implant osteotomy; i.e finish the bone drilling to place the implant. A minimal drilling is sufficient even in case of corticalized bone as the apex diameter is only 1.5mm for an implant of 3.3mm.

           -                   Both implant and titanium implant holder are retrieved from their sterile capsule and placed in the implant site. The use of a handle may eventually be helpful for insertion, especially when the implant must respect a certain alignment.

When inserting the implant into its site, it will easily penetrate it because of its high conicity and allows not only condensation but also bone expansion that is free from the risk of fracturing the external cortical, i.e bone crust.

Beyond its characteristics, the easy insertion into the bone allows such a dental implant to be adaptable to simple or complex clinical situations. It is possible to correct the direction of the implant during its insertion into the bone to guide it more favourably along the prosthetic axis or to align it to other implants. Besides, placing implants in patients with severe resorption, in presence of an insufficient bone width allows a progressive expansion of the vestibular bone surface by modifying the bone elasticity. Then, the implant plays the role of the expander by leverage.

          Finally, another advantage is the gain of time due to a reduced sequence of drills. A minimal drilling less than 2mm from the implant diameter is sufficient to place the implant in the jaw with a very good primary anchorage. Lesser bone heating and an improved bone healing rapidly procure a stabilization of the implant site and facilitate rapid insertion.

When realizing such a process, the implant site needs to be prepared only with the first and second drill of 1.5mm and 2mm, respectively, to place the implant which base has a nominal diameter of 3.3mm or 3.75mm. Nonetheless, other drills may be used. For example, to place an implant with a nominal diameter of 4.2mm, the use of a 2.8mm diameter for the first drill and 3.2mm diameter for the second drill is preferred.

Furthermore, as described, this implant may be inserted with an insertion force higher than 70N/cm without forcing the apical bone. This is the result of a high conicity at the apex allowing it also to reduce bone heating. Particularly, apical osteotomy is reduced by 30% which in other terms mean that bone matter indentation is reduced by 30%.

          It has also been noted that, during the insertion, a cortical expansion and voussure with a horizontal bone gain of 1.5mm to 2mm is necessary to securely place the implant, in case the implant’s base has nominal diameter of 3.3mm. This expansion is stable for a long term even after uncovering the implant.

          If the cortical bone surrounding the implant is less than 1.5mm or in presence of a crack, bone rearrangement by apposition may be necessary, using for example synthetic biomaterials or xenografts or autogenous bone grafts covered with a collagen membrane or platelet derivatives after preliminary blood test.

          Bone healing delay after placing such an implant is about 6 weeks, without filling as it presents a very high primary stability to insertion and motionlessness without any micromouvement which facilitates osteobasltic adhesion at the bone/implant interface. Osteoblasts are young bone cells that participate in ossification and then transform into osteocytes.

CONCLUSION

          This implant is indicated in cases of narrow ridges comprised between 2 and 4mm in which placing an implant in a one-step surgery would be impossible. Magitech S implant acts as a bone expander: it proved its efficacy in highly corticalized mandibular ridges. Its effortless insertion into the bone allows it to be adaptable to any simple or complicated clinical situation. It is possible to correct the direction of a Magitech S imlant during its insertion into the bone to favourably guide it along the prosthetic axis or to align it to other implants. The use of an implant holder handle during the insertion is recommended in this case. Placing a Magitech S implant in patients with severe resorptions, in presence of an insufficient bone width, allows a progressive expansion of the vestibular bone base by modifying bone stability. Magitech S implant plays the role of the expander by leverage.