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Reconstruction of Atrophic Maxillary Ridges Using Mandibular Blocks With and Without Coverage Using Collagen Membrane

Is the use of collagen membrane on top of particulate bone mixture covered by onlay bone block in Maxilla better than the use of mixture of particulate bone covered by onlay bone block without the use of collagen membrane, in terms of bone quality and bone quantity?

External Dead Space in Ventilated COVID-19 Patients

The objective is to investigate the efficacy of volumetric capnography to detect changes in dead space, CO2 elimination and shape factor parameters before and after disconnection of external dead space in ventilated COVID-19 patients.