Conical Seal Design™ is the original and scientifically documented conical connection of the Astra Tech Implant System™, creating a strong and stable fit between implant and abutment. Below you will find many references that primarily address the technical questions related to Conical Seal Design.
Micro-movements at the implant-abutment interface: measurement7 causes, and consequences
Purpose: Most of two-component or multicomponent implant systems use an implant-abutment connection with a clearance fit. The clinical impact is assumed as high according to the following factors: 1) Implant systems consisting of two or several components are much more widespread than single component systems because they offer a number of wellknown clinical and technical advantages. 2) Unconnected crowns in the posterior region are more susceptible to technical failure of the implant-abutment interface. 3) Crestally or subcrestally placed implant-abutment interfaces are frequently subjected to crestal bone resorption following abutment connection. This in-vitro study examined the dynamic behaviour of different designs of implant-abutment connections
Materials and methods: Abutments were loaded at an angle of 30° with a force of up to 200 N. The distance of the point of force application from the implant platform was 8 mm; the gradation of the force was 0.3 N/ms. The interface of the implant-abutment connection was examined and measured radiographically using a professional high speed digital camera (1,000 images per second).
Result: The results showed that, under simulated clinical conditions, complex mechanisms are responsible for the presence or absence of a micro-motion. All implant-abutment connections with a clearance fit exhibit a micro-motion (implant systems: SIC®; Replace Select®; Camlog®; XIVE®; Straumann synOkta®; Bego-Semados®; Straumann massive conical abutment®). Precision conical connections (implant systems: Ankylos®; Astra Tech) show no micromotion.
Implant
Index
Micro-spalt at 200 N
Astra Tech
dodecagonal
0.0 pm
Ankylos®
non indexed
0.0 pm
Straumann
massive
abutment®
non indexed
0,1-4 |jm
Bego-Semados®
hexagonal
0,1-4 pm
Replace Select®
3-positions
12-16 1 jm
XIVE®
hexagonal
16-20 pm
Straumann synOkta®
oktagonal
20-24 pm
Straumann synOkta®
oktagonal
20-24 pm
SIC®
hexagonal
28-32 pm
Camlog®
3-positions
32-36 pm
Discussion: The potential clinical relevance of these results can at this point only be derived from theoretical considerations. Presumably, the pumping effect caused by the micro-motion plays an important role for crestal bone resorption. It is assumed that the bone is contaminated with liquid contained in the implant.
Astra Tech
BioManagement Complex 
