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implants - international magazine of oral implantology

research I ingmaterialswithsimilarpropertiesaresoughtafter. One option to overcome these disadvantages of au- togenous bone is the usage of allogeneic bone. The purpose of the following study is to evaluate the use ofallogeneicparticulatecorticalboneforthesurgical elevation of the sinus membrane in order to success- fully install dental implants. The properties of allo- grafts are described and a case report of failure sur- gery is analysed. _Material and methods Patients IntheperiodbetweenJuly2008andOctober2010, 36 patients (19 females and 17 males) with an aver- age age of 54 years underwent surgery at the Dorow Clinic in Waldshut, Germany. All patients suffered fromaseveremaxillaryatrophy(boneheightlessthan four millimetres), making augmentation necessary for successful installation of dental implants. Exter- nal sinus membrane elevation was carried out as ex- clusive surgical technique. Allogeneic particulate cortical bone was used as grafting material in all pa- tients. In each case, implants were installed in a sec- ond intervention. A cone beam computer tomogra- phy (CBCT) was created preoperatively to display the bonystructuresandpreciselyevaluateaugmentative surgeryindications.Inthisstudy,successwasdefined as the ability to install dental implants in the aug- mented sites. Certainly, the desired criterion of suc- cess ought to be the success of the subsequent pros- thetic treatment after years of follow-up. Due to our being only one part of the medical referral chain, we have not been able to keep track of all patients in- volved in this study. Also, not all patients have yet been restored prosthetically. Additionally, we have beenusingallogeneicbonegraftsinourclinicforonly a few years now. As a consequence, the focus of this study lies exclusively on augmentation itself. Graftingmaterial Inallcasesallogeneicbonetransplantswereused. All grafts were obtained from ARGON Medical, the German distributor for allogeneic dental transplants processed by the German Insitute for Cell and Tissue Replacement (Deutsches Institut für Zell- und Ge- webeersatz, DIZG). The DIZG uses a peracetic acid- ethanol sterilisation (PES) procedure on its trans- plants.Thisvalidatedprocedureprovestobeareliable method for the sterilisation of human bone trans- plants.11,15-17 Afterthoroughcleaningofbloodandfat tissue by using sterile water under high pressure, the bone is scoured by chloroform and ethanol. Then the actual sterilisation is performed under low pressure 4.0 x 5.0mm 4.0 x 6.0mm3.0 x 6.0mm5.0 x 5.0mm 6.0 x 6.0mm6.0 x 5.0mm 5.0 x 6.0mm4.5 x 6.0mm Bicon Europe Ltd. Hauptstr. 1 55491 Buechenbeuren Germany Phone +49 (0)6543/81 82 00 Fax +49 (0)6543/81 82 01 germany@bicon.com www.bicon.de.com 5.0 x 5.0mm 4.5 x 6.0mm 5.0 x 6.0mm 5.0 x 6.0mm 6.0 x 5.0mm 6.0 x 5.7mm 5.0 x 5.0mm 6.0 x 5.7mm 6.0 x 5.7mm 7 YEARS 8 YEARS 4 MONTHS 8 YEARS Blood Vessel within Haversian System 6.0 x 5.7mm 14 YEARS AD

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