Abstract
Thirty six cases of postoperative maxillary cysts closely related to teeth were observed, and divided into three types based on clinical findings. Type I is designated by the term of postoperative radicular cyst.
Based on the clinical findings that roots exposed in cysts are apparently healthy, but actually pulpless teeth, the process of cyst formation is believed to occur in the following manner.
Pulp necrosis causes by apical root injury at the time of radical surgical procedures to the maxillary sinus. The pulp necrosis leads to apical periodontitis, apical granuloma, and finally development of radicular cyst.
Histlogical examinations of the linings of the cysts demonstrated that cyst wall is lined with not so much squamous epithelium characterized by radicular cyst as ciliated columnar epithelium. This cyst is, therefore, distinct from the cyst development associated with the dental caries.
