What is the Eastern Time Zone? The Eastern Timezone is an area 5 hours behind Greenwich Mean Time ( GMT-5 ) during the winter months (referred to as EST) and 4 hours behind Greenwich Mean Time ( GMT-4 ) during the summer months (referred to as EDT). From 2 A.M. on the second Sunday in March to 2 A.M. on the first Sunday in November, Daylight Saving Time is in effect.
WHAT ARE SINUSES? Sinuses are air pockets that are located within the bones of the skull and face and are connected to your nasal passages by small tubes or channels, the osteomeatal complex. These channels permit air to flow from the nose into the sinuses and allow drainage of mucous from each sinus into the nose.
Situated just above the roots of the molars in the upper jaw is the maxillary sinus. The sinus is a hollow cavity in the skull. When excess bone recession has occurred in this area, a dental implant cannot be placed without a bone graft. The bone depth in this area can recede to a thickness of just a few millimeters. An implant placed in this area would protrude into the sinus.