Micromovements at the Implant-Abutment Interface: Measurement, Causes, and Consequences

Zipprich, Holger / Weigl, Paul / Lange, Bodo / Lauer, Hans-Christoph

Abstract

Most of two-component or multi-component implant systems use an implant-abutment connection with a clearance fit. The clinical impact is assumed as high according to the following factors:

  • Implant systems consisting of two or several components are much more widespread than single component systems because they offer a number of well-known clinical and technical advantages.
  • Unconnected crowns in the posterior region are more susceptible to technical failure of the implant-abutment interface.
  • 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. 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 radiologically using a professional high speed digital camera (1,000 images per second).

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 micro-motion.

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.

Link to article

The paper has been published in the german journal Implantologie. (Vol. 15,2007 Issue 1, p. 31-46)

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further results




Contact

Dipl.-Ing. Holger Zipprich
Poliklinik für zahnärztliche Prothetik, Sektion Werkstoffkunde
Theodor-Stern-Kai 7 / Haus 29, D-60590 Frankfurt am Main
Tel: +49 (0)69/6301-4714, eMail:zipprich@em.uni-frankfurt.de

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