1990 Volume 1990 Issue Supplement37 Pages 128-133
We reviewed the radiological findings on 47 cases of postoperative maxillary cyst that had been operated on between 1983 and 1988.
Our radiographic classification using p olytomographic frontal section was done according to air containing cavity connected to Pars membranacea, as retraction of lateral sinus wall and inferior extension of the cyst. We classified all cases into four types and found statistical results as follows.
A postoperative c yst located in the lower portion of the maxillary sinus was observed in many cases (20 cases,43%). The type without postoperative exchange of maxillary sinus and the type of cyst with lower extension had a high incidence. In the former type, the period after the first operation due to chronic sinusitis was shortest of all other types. Therefore the cyst was considered to be caused by closure of the internasal opening from the maxillary sinus to nasal cavity. In the latter type, first operative age due to chronic sinusitis was oldest of all other types, therefore we could not disregard the relation between inferior extension of cyst and maxillary growth and root of teeth.
