BEGO Semados® RSX-Line
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BEGO Semados® RSX Implants are universal and
may be implanted in all regions of the jaw and in all bone qualities.
- In the maxilla and mandible
- With immediate implantation
- With sinus lift surgery to avoid accidental perforation of the sinus membrane
- With narrow anterior gaps (RSX 3.0) to replace the teeth 12, 22, 32-42
- Diameters: 3,0 – 3,75 – 4,1 – 4,5 – 5,5 mm
- Length: 7 – 8,5 – 10 – 11,5 – 15 mm
- Made from Grade 4 commercially pure titanium
- High-purity, homogeneous, blasted/etched TiPurePlus surface
- Conical implant design with rounded apex
- Microstructured shoulder with platform switch
- Microgrooves in bionic design (patent pending) for reduction of stress peaks
Minimal bone loss around a dental implant is one of the fundamental design objectives when developing dental implants. According to Frost‘s theory , which is widely accepted in the field of biomechanics, bone loss is linked to unphysiological overloading at the point where the implant enters the bone. To avoid overloading, the BEGO Semados® RS/RSX-Line boasts a number of design features:
- The implants in the RSX-Line display a conical implant body. The implant body is equipped with a self-tapping, bionic thread. The bionic thread reduces the mechanical loading on the implant
body and is advantageous for the surrounding bone.
- The implant-abutment connection was designed employing the tried-and-tested principle of the 45° cone. The 45° cone allows biomechanically advantageous transmission of forces from the abutment to the implant. At the same time, no micro-gap appears when subjected to physiological loading.
- The RSX implants feature platform switching of 0,25 mm. The platform switching reduces the loading peaks in the bone along the bone margin. However, platform switching is only effective
if the bone is no more than 0.5 mm below the level of the platform switching. If the bone recedes, the platform switching is not biomechanically efficient. To keep the bone loading low in cases of very low bone recession, the implant neck is furnished with bionic microgrooves (patent pending). The microgrooves reduce the stress peaks along the bone margin and along the tips of the microgrooves at the same time. This makes it possible to reduce stress in the bone considerably, even if the bone recedes below the level of the platform switching.
The design features in detail
If the cone angles in the implant-abutment connection are small, the implant body spreads when subjected to masticatory loading. Similar to splitting wood with an axe, a wedge effect develops. This wedge effect results in additional loading in the bone (Fig. 2a). Implant-abutment connections with larger cone angles (e.g., 45°) avoid this wedge effect and bone loading is reduced (Fig. 2b) .
To ensure no bacteria enter the implant-abutment connection,
it is essential to avoid development of a micro-gap between the implant and abutment when subjected to masticatory loading. Trials  and finite element calculations  have shown that no micro-gap forms when a 45° cone is used when subjected to physiological masticatory loading.
The term “platform switching” refers to the difference in diameter
between the abutment where it enters the implant and the external diameter of the implant . If the bone is exactly at the point of the diameter difference, this creates a biomechanically advantageous situation for the bone. The diameter change transfers the force deeper into the bone, which decreases the bone load along the bone margin .
However, the biomechanical effect of platform switching is only effective if the bone is exactly at the level of the platform switching. If, during insertion, a gap of just 0.5 mm appears between the bone and the level of the platform switching or if the bone recedes by the same amount, the biomechanical effect will disappear. To relieve the loading on the bone in cases where the bone is somewhat deeper, the BEGO SEMADOS® RSX implants also feature bionic microgrooves.
The RS/RSX-Line implants have bionic microgrooves in the top
area of the implant (patent pending, not yet published). The microgrooves are designed to reduce the stress directly at the bone margin and reduce the stress at the tips of the grooves at the same time. Compared with implants without microgrooves (microthreads), the reduction in stress is up to 50%.
Figures (3a and 3b) show an implant without microgrooves
(microthreads). High loads appear at the bone margin, which can result in bone loss  (red area in Figure 3b). The bionic microgrooves considerably reduce bone loading. As such, the loads that occur at the bone margin and at the tips of the microgrooves are considerably reduced. The load is distributed more equally throughout the bone (Figures 3c and 3d).
The bionic thread design
Application of Mattheck‘s [3-5] axiom of uniform stress makes
it possible to design the implant‘s threads to cope ideally with loads. The bionic thread structure generates considerably lower stresses in the implant. In addition, stress in the bone can also be reduced.
- Flach, M. / Streckbein, P. (2009): Knochenfreundlicher Kompromiss, Dental Magazin, 27:48-53.
- Frost, H. M. (2003): Bone’s mechanostat: a 2003 update, Anat Rec A Discov Mol Cell Evol Biol, 275:1081-1101.
- Mattheck, C. (1997): Design in der Natur – der Baum als Lehrmeister, Freiburg: Rombach Verlag.
- Mattheck, C. (2003): Kerbspannungen sind Biegespannungen – was sind gute und böse Kerben? Mat.-wiss. u. Werkstofftechnik, 34:427-429.
- Mattheck, C. (2004): Gibt es eine Universalkerbkontur nach dem Vorbild der Natur? Mat.-wiss. u. Werkstofftechnik, 35:582-586.
- Streckbein, P. / Streckbein, R. G. / Wilbrand, J. F. / Malik, C. Y. / Schaaf, H. / Howaldt, H. P. / Flach, M. (2012): Non-linear 3D evaluation of different oral implant-abutment connections, J Dent Res, 91:1184-1189.
- Tabata, L. F. / Rocha, E. P. / Barao, V. A. / Assuncao, W. G. (2011): Platform Switching: Biomechanical Evaluation Using Three-Dimensional Finite Element Analysis, The International Journal of Oral & Maxillofacial Implants, 26:482-492.
- Zipprich, H. / Weigl, P. / Lange, B. / Lauer, H.-C. (2007): Erfassung, Ursachen und Folgen von Mikrobewegungen am Implantat-Abutment-Interface. Implantologie, 15:31-46.