Entwicklung und Eigenschaften eines resorbierbaren Implantatstabilisators zur Sinusliftoperation

To obtain a sufficient primary stability of implants in the lateral maxillary area, a bone thickness of minimum 4 mm is necessary, but often additional osteoplastic operations are required. Regarding this, several sinus lift techniques are known. In this case, the use of an implant stabilizer made of resorbable synthetic material reduces the operation invasivity. For this purpose, a polylactate implant stabilizer with appropiate shape and function has been developed. The following material's characteristics, such as the material's hydrolysis, the reduction of the molecular weight and the mechanical retention on the implant have been analysed in vitro. Hydrolysis has been performed following ISO/TC 150 SC 1 standard, and its effects have been documented by SEM images and illustrated with degradation curves. The mechanical properties are defined by the stabilizer's traction forces in the direction of the implant shaft. Before hydrolysis, the median traction force is 118 [N], one month after, it is reduced to 94 [N] and three months after hydrolysis, the complete absence of any retention force is achieved. The stabilizer has been inserted in the subperiostal tissue of a Goettingen mini pig's frontal bone. Four months later, the material has been removed. The presented histological preparation shows the osteo-inductive properties of the stabilizer. Keywords: resorbable, implant stabilizer, sinus lift