Dental manipulation is often associated with the placement of implants in patients with partial or complete tooth loss. Before implants are placed, the dental surgeon is most often faced with a bone deficit in the alveolar ridge area. With any technique, the main disadvantage of autologous bone extraction is the additional trauma to the patient. Reducing the invasiveness of the surgical steps is particularly relevant in elderly patients with comorbidities [1, 2, 3]. In this article, the authors propose to use bone blocks of allogenic origin when restoring defects of the alveolar ridge of the jaw bones.
According to the pre-made patterns of 3D-design and prototyping patterns during the experiment, defects of the lateral portion of the ram's lower jaw were created using the piezosurgical technique. The defects were replaced by plastic implants obtained by the method of layer-by-layer melting of FDM-printing (fusing deposition modeling, FDM) and fixing titanium screws to the jaw body. In the time interval, plastic implants are replaced by titanium ones, obtained using SLS technology -selective laser sintering using a 3D-printer. In order to study the processes of reparative osteogenesis, microsamples of tissues of the periimplantation zone were analyzed. As a result, signs of osteo- and fibro-osseointegration were identified. The data obtained are regarded as a prerequisite for further clinical trials of the developed protocols for the sequential replacement of defects of the jaws using 3D-printing.
Various types of techniques increase the volume of the atrophied alveolar ridge are used as bone blocks, ridge splitting, osteoperiostal flap, etc. However, one of the most promising methods to date is the GBR method. The use of bone-substituting materials and isolating membranes gives a reliable and predictable result in dental implantology. Recent studies using the dPTFE (dense polytetrafluoroethylene ) membrane have shown a positive result at the site of regeneration even if the membrane itself is exposed in repaired period. With this type of complication the membrane is removed at a period of 4–6 weeks and replaced with a collagen membrane with subsequent approximation of the edges of the flap by sutures (24, 25). This article shows the possibility of regenerating the bone graft from sole xenogenic material using dPTFE membrane in case wound dehiscence in repaired period but without using the collagen membrane coating step after removing dPTFE and it healing by secondary tension.
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