Abstract. Background: The aim of this study was to investigate the possible use of Polypropylene mesh implant and A-PRF membrane for covering the defects of the lateral and back wall of the maxillary sinus after its traumatic damages. Materials: non-resorbable Polypropylene mesh implant was used in 10 patients as a barrier membrane for prevention of adipose tissue herniation into maxillary sinus. Method: 3 D CT was used for assessment of bone fragments position and volumetric parameters of the maxillary sinus before and after surgical repair. Result: Postoperative 3-D CT after 2 months demonstrated effective reestablishment of anatomical configuration of sinus and its volume, absence of pathological inflammatory changes of the sinus mucosa. Conclusion: Polypropylene mesh implant provides effective barrier between soft tissues and maxillary sinus, due to its strength characteristic and biocompatibility.

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The chin affects facial esthetics and the harmony between frontal and lateral views and is one of the most important anatomic structures of the lower third of the face. Chin osteotomy is aimed at ensuring the harmonization of the facial profile by balancing the size and form of the lower third of the face. It is assumed that the isolated genioplasty surgery will improve the pharyngeal airway space (PAS) by promoting muscle changes, specifically by pulling forward the hyoid bone and decompressing the hypopharynx region. Two patients without obstructive sleep apnea syndrome (OSAS) underwent isolated chin osteotomy for esthetic purposes. Forward movement of the chin by the Pg point was 7 mm in one case and 11 mm in another case. They were evaluated by preoperative and postoperative cone-beam computed tomography scans. The upper airway space was subdivided into retropalatal and retroglossal spaces. After this, the upper airway space was analyzed through the following criteria: 1) three-dimensional, high-altitude, cross-sectional surfaces; 2) transverse and anteroposterior diameter changes. Isolated segmental genioplasty was used after precise virtual planning and resulted in the PAS increase only in one case. There was a relevant correlation between the vertical and horizontal chin change and the hypopharynx. There was an average of a 1.6-fold increase in the total volume of the upper airway space. The retroglossal space was increased 1.5-fold. In another case, there was no relevant correlation between the vertical and horizontal chin change and the PAS. Isolated segmental chin osteotomy provides predictable esthetic results in the correction of different mandible anterior deformities and may contribute to an increased volume and a morphologic airway change. Further studies should be conducted to evaluate the effect of isolated segmental genioplasty on the pharyngeal airway space.

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