R hinogenous – infection spreads from the nasal cavity. It is the most common way for infection and such sinusitis is the complication of the flu.
O dontogenic – infection spreads from upper teeth. This way is typical only for maxillary sinus. The pathologic process may spreads from 4,5,6 cheek-teeth apex to the inferior wall of the maxillary sinus
There are three main factors lead to the sinusitis development:
The most important factor is the opening of sinus hole . It may be blocked due to different reasons . As a rule , the hole may be blocked by the swollen mucous membrane . The other reason may be an anomaly of anatomical structures . The retain of secret , decrease the pressure of oxygen contribute the bacteria multiplication.
The other important factor is the defect of self-cleaning mechanism of the mucous membrane of sinus. Bacteria, viruses damage the respiratory epithelium and cause the immobility of the cilia.
PATHOGENESIS OF SINUSITIS Changes of secret quality are taken place in the development of sinusitis . Secret becomes more concentrated and stick and therefore it can not be eliminated from the sinus .