Oro-antral
fistula:
Invasion of the maxillary sinus and establishment of a
direct communication with the oral cavity is referred to as an oro-antral
fistula.
Factors
influencing creation of oro-antral fistula:
Ü Teeth
size and configuration of the roots.
Ü Hypercementosis
and bulbous roots.
Ü Density
of alveolar bone and thickness of sinus floor
Ü Size
of the sinus.
Ü Relation
of sinus to the root of upper teeth.
Ü Rough
extraction and misguided
manipulation.
Ü Apical
pathosis and attached granulomas.
Ü Periodontal
diseases which may erode sinus floor.
Ü Presence
of cysts and neoplasm.
Ü Invasive
surgery e.g. cleft and dental implants placement.
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