Discuss the importance of septa in maxillary sinus during a sinus lift or graft surgery.

Septa, when present in the maxillary sinus will divide it into sections creating separate compartments. These septa will act as additional bone growth regions within the graft helping in bone augmentation. Dense septa also enhance the initial stability for the implants. However, they may create difficulty at the time of surgery. Elevation of the membrane over the sharp webs often results in tear in the membrane.