The aims of the investigation conducted in the Institute of Glass and Ceramics was to prepare glass-ionomeric materials for otologic surgery. The synthesis of the materials developed on the basis of glass powders belonging to the system Na2O-CaO-SiO2-Al2O3-P2O5-F and setting liquids which were copolymers of acrylic and itaconic acids.
1. Glass-ionomeric cement. Once the components are mixed, a plastic pulp is obtained. It sets in a determined period of time and the process does not provoke temperature increase. The cement shows high formability, good adhesion to wet surfaces so the interface between the cochlear implant and the bone is very resistant. The cement allows the wide range of anatomical reconstructions of bone defects that are result of disease processes or surgical removal. The anatomic reconstruction allows to restore primary and optimal function of the treated tissues.
2. Glass-ionomeric implants made in two sizes provide possibility of reconstruction of ossicular chain. The implants shape corresponds to that of a plate with a stem tapering towards the end. In both sizes the angle between the stem and the plate is of 75o. Implants have smooth surface and rounded edges. The method of manufacturing allows perfect mapping of complicated shapes. Quick and effective, total and partial reconstruction of the ossicular chain is possible. This allows to restore the right function of the middle ear. In many cases application of these implants allows significant reduction in operation time.
3. Granulated glass-ionomeric material is used in two granular ranges: 1,0 - 1,6 mm and 1,6 - 3,2 mm. The method of manufacturing allows to obtain porous material for filling cavities and channels of the temporal bone.
The biological in vitro as well as in vivo tests of these materials were conducted; clinical examination are in course.