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International Poster Journal of Dentistry and Oral Medicine



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Int Poster J Dent Oral Med 11 (2009), No. 4     15. Dec. 2009

Int Poster J Dent Oral Med 2009, Vol 11 No 4, Poster 472

External validity of clinical study results - the German Astra Bone Level Study

Language: English

Prof. Dr. Dr. Bilal Al-Nawas, Nabil Benabadji, Prof. Dr. Dr. Wilfried Wagner,
Klinik für Mund-, Kiefer- und Gesichtschirurgie, Universität Mainz
Dr. Dr. Tilo Johannes Barth,
Praxis und Praxisklinik für Mund-, Kiefer- und Gesichtschirurgie, Mannheim
Dr. Wolfram Eisenblätter,
Praxis, Karlstadt
Dr. Heinreich Hindelang,
Praxis, Nürnberg
Dr. Siegfried Hoelzer,
Praxis, Königsbach-Stein
Dr. Om Jangra,
Praxis, Alfeld/Leine
Dr. Christopher Köttgen,
Praxis, Mainz
Dr. Franz-Werner Krieger,
Praxis, Idar-Oberstein
Dr. Florian Müllner,
Praxis, Rosenheim
Dr. Anders Nordlund,
Praxis, Würzburg
Dr. Dr. Maximilian Ohneis,
Praxis, Abensberg Hallertau
Dr. Michael Pampel,
Praxis, Coburg
Dr. Alfred Rau,
Praxis, Wiesbaden
Prof. Dr. Ernst-Jürgen Richter,
Poliklinik für Zahnärztliche Prothetik, Universität Würzburg
Prof. Dr. Dr. Torsten E. Reichert,
Klinik und Poliklinik für Mund-, Kiefer- und Gesichtschirurgie, Universität Regensburg
Prof. Dr. Dr. Dr. Robert Sader,
Klinik für Mund-, Kiefer- und Plastischen Gesichtschirurgie, Universität Frankfurt am Main
Dr. Martin Ullner,
Praxis, Hochheim am Main
Dr. Stefan Ullrich,
Praxis, Weiden

September 18-20, 2008
European Association for Osseointegration 17th Annual Scientific Meeting
Warsaw, Poland


The aim of this study was to evaluate marginal bone resorption at two different implant shapes focussing on differences between high recruiting implant centers and low recruiting implant centers.

Fig. 1: Situation prä-OP Fig. 2: Insertion of Astra Tech® standard implant
Fig. 3: Situation post-OP Fig. 4: AstraTech®-Implant
Fig. 5: Post-OP
Fig. 6: After 24 months

Material and Methods

4 university clinics and 14 single practices took part. Inclusion criteria were two missing teeth in the lower jaw distal of the incisor. No augmentation procedures and a planned fixed restoration. In all patients one straight Astra implant (3.5 or 4.0 mm) and one conical Astra (4.5 or 5.0 mm) were inserted. 125 patients with 318 implants were included. Panoramic X-ray images were taken at 5, 12 and 24 months.

Fig. 7: Measuring specification
Fig. 8: Distance between implants and teeth


- One implant was lost.
- The median implant length was 11 mm with a diameter of 4 mm.

Fig. 9: Depth of the insertion Fig. 10: Marginal bone resorption in high and low recruiting centers
Fig. 11: Marginal bone resorption conserning the implant form


Conical or straight implant shape did not lead to different bone resorption. There was also no difference between high and low recruiting centers. Thus the result show a high external validity.

This Poster was submitted by Prof. Dr. Dr. Bilal Al-Nawas

Correspondence address:
Prof. Dr. Dr. Bilal Al-Nawas
Klinikum der Johannes Gutenberg-Universität Mainz
Klinik für Mund-, Kiefer- und Gesichtschirurgie
Augustusplatz 2
55131 Mainz