This intensive two-day masterclass in Frontal Sinus Surgery will focus on frontal sinus dissection using cutting edge 3D printed anatomical models. Our multi-material models provide different anatomical grades of frontal sinus complexity and therefore enable the participants to approach the frontal sinus in a stepwise approach. This workshop will mainly concentrate on the hands-on-step-by step-surgical dissection performed by the participants with close supervision from world renowned faculty. Each dissector will undertake up to of 5 frontal Dissections and 2 Modified Endoscopic Lothrop / Draf 3 procedures. There will be a focus on powered instrumentation in endoscopic sinus surgery elaborating the advantages and risks of this surgical technique.