{"_buckets": {"deposit": "0e9ea128-404e-4b7d-ab96-9cc0e2b8f3f6"}, "_deposit": {"id": "25891", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "25891"}, "status": "published"}, "_oai": {"id": "oai:niigata-u.repo.nii.ac.jp:00025891"}, "item_7_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Two Cases of Severely Affected Hypoplastic Maxillary Primary Incisors with Exposed Pulp"}]}, "item_7_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1997-12", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "2", "bibliographicPageEnd": "48", "bibliographicPageStart": "43", "bibliographicVolumeNumber": "27", "bibliographic_titles": [{"bibliographic_title": "\u65b0\u6f5f\u6b6f\u5b66\u4f1a\u96d1\u8a8c"}, {"bibliographic_title": "\u65b0\u6f5f\u6b6f\u5b66\u4f1a\u96d1\u8a8c", "bibliographic_titleLang": "en"}]}]}, "item_7_description_4": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "Hypoplasia of primary teeth is rare compared with that of permanent teeth, and the hypoplastic lesions are usually localized within the enamel and dentin layer. This report describes two cases of severely affected hypoplastic maxillary primary incisors with exposed pulp. The patients were a 1-year-11-month-old boy (case1) and a 2-year-11-month-old boy (case2). In case 1, the labial cervical gingiva of the maxillary right primary central incisor was swollen and extended to the hypoplastic labial surface. After the swollen gingiva was removed surgically, the hypoplastic labial surface appeared with the exposed pulp. The central incisor was treated by vital pulpotomy. Histological examination of the removed gingival tissue revealed there were formation of many pieces of dysplastic tooth elements in granulation tissue at the connecting part with the exposed pulp. The findings suggested that pulp exposure resulted from focal dental hypoplasia not from resorption of the tooth. In case 2, the maxillary left primary lateral incisor had started to erupt at the age of 2 years 11months. Most of the crown was defective and covered with gingival tissue. After the gingival tissue overlying the crown was removed surgically, small pulp was exposed and the incisor was treated by vital pulpotomy. Histological examination of the removed gingival tissue revealed granulation tissue. 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