@article{oai:mdu.repo.nii.ac.jp:00001138,
 author = {安田, 英一 and 山本, 昭夫 and 笠原, 悦男},
 issue = {3},
 journal = {松本歯学},
 month = {Dec},
 note = {application/pdf, A maxillary second premolar, which had been treated with pulpectomy of an intact pulp about 8 years ago, flared up suddenly with spontaneous pain and pain on percussion. The condition was diagnosed as acute apical periodontitis of unknown cause. When the root canals were obturated and a radiograph was taken, it became clear for the first time that pulp gangrene in an apical ramification had caused first the acute apical periodontitis, and subsequently, a lateral lesion.},
 pages = {317--321},
 title = {原因が判明し難かった急性根尖性歯周炎の1例},
 volume = {15},
 year = {1989}
}