In physics, a photon is a bundle of electromagnetic energy. It is the basic unit that makes up all light. The photon is sometimes referred to as a quantum of electromagnetic energy. Photons are not thought to be made up of smaller particles. They are a basic unit of nature called an elementary particle. Properties of a Photon. Photons have some basic properties that help define what they are and how they behave.
Rad 270 Paranasal Sinuses. The maxillary sinus is aerated at birth. The other sinuses begin to aerate at 6 y/o. Aeration is completed by age 18. Chronic sinusitis T1 weighted normal sinus w&w/o gadolinium Polyps Multidetector CT scans of paranasal sinus in a patient with deviation of nasal septum. Brem M H et al.
The maxillary sinus is always a consideration when placing dental implants in the posterior upper jaw. Oftentimes the floor of the maxillary sinus scallops around the roots of maxillary molar and premolar teeth. This is particularly true with maxillary first molars (#3 and #14) and maxillary second molars (#2 and #15). As a result, when these teeth are extracted there may not be adequate bone height to support dental implants in the posterior maxilla without grafting.