Tomographic and Histologic Assessment on the Influence of the Use of a Collagen Membrane to Protect the Antrostomy After Maxillary Sinus Floor Augmentation.

Surgical technique for increasing the vertical bone height of the posterior maxilla an antrostomy of about 5 mm in height and 10 mm long will be prepared using a diamond insert mounted on a sonic-air surgical instrument. The Schneiderian membrane will be elevated and clinical measurements will be performed using an UNC 15 probe. The space obtained underneath the sinus mucosa will be filled with the xenograft and a resorbable collagen membrane will be placed to cover the antrostomy only at the randomly selected control sites.