{"created":"2023-06-19T07:38:06.027196+00:00","id":1071,"links":{},"metadata":{"_buckets":{"deposit":"547259cc-a4f9-4a0c-9b11-d433f96c216c"},"_deposit":{"created_by":3,"id":"1071","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"1071"},"status":"published"},"_oai":{"id":"oai:mdu.repo.nii.ac.jp:00001071","sets":["1:44:87"]},"author_link":["0"],"item_2_alternative_title_1":{"attribute_name":"その他（別言語等）のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Guidelines for Root Canal Preparation"}]},"item_2_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1991-04-30","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"19","bibliographicPageStart":"1","bibliographicVolumeNumber":"17","bibliographic_titles":[{"bibliographic_title":"松本歯学"}]}]},"item_2_description_19":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_2_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"In order to obtain as good a preparation as possible for root canals, which can never be examined directly, appropriate guidelines for mechanical instrumentation are necessary. We conducted a series of experiments to investigate how large the apical portion of the root canal should be prepared during instrumentation in order to assure adequate debridement without risking destruction of the apical portion of the tooth. Anatomical studies, including those we have conducted, have shown that even root canals having a wide, ribbon-like form generally taper to a narrow constriction just short of the apical foramen. Accordingly, instrumentation close to the foramen can be expected to increase the possibility of producing a circular preparation. But the conventional guideline once commonly given for the final size of the preparation was found to be usually inadequate for providing a circular apical preparation, even when instrumentation was conducted to 0.5 mm from the foramen. A set of guidelines for apical enlargement, suggested by Yasuda, advocates a uniform size of enlargement given the type of tooth and canal configuration involved. The suitability of these guidelines, except in instances of severely curved canals, was confirmed through clinical and experimental evaluations of the adequacy of the recommended sizes for various root canal systems. However, it has been observed in experiments with monkeys that instrumentation too close to the foramen increases the risk of periapical complications. We concluded from our experiments with extracted premolars that when instrumentation is conducted to lmm from the foramen, the degree of enlargement specified by Yasuda's guidelines assures an adequate apical preparation, while reducing the risk of extruding debris or destroying the apex, for most of the canal configurations we examined for this type of tooth.","subitem_description_type":"Abstract"}]},"item_2_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"松本歯科大学学会"}]},"item_2_source_id_11":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00232590","subitem_source_identifier_type":"NCID"}]},"item_2_source_id_9":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0385-1613","subitem_source_identifier_type":"ISSN"}]},"item_2_version_type_20":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"笠原, 悦男"},{"creatorName":"安田, 英一"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2012-05-24"}],"displaytype":"detail","filename":"matsumoto_shigaku_17-01-01.pdf","filesize":[{"value":"5.5 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"matsumoto_shigaku_17-01-01.pdf","url":"https://mdu.repo.nii.ac.jp/record/1071/files/matsumoto_shigaku_17-01-01.pdf"},"version_id":"c78a5ae9-5596-4ab2-b177-725b1c6a213e"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"根管形成","subitem_subject_scheme":"Other"},{"subitem_subject":"拡大基準","subitem_subject_scheme":"Other"},{"subitem_subject":"系統的研究","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"journal article","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"根管形成のガイドライン","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"根管形成のガイドライン"}]},"item_type_id":"2","owner":"3","path":["87"],"pubdate":{"attribute_name":"公開日","attribute_value":"2012-05-24"},"publish_date":"2012-05-24","publish_status":"0","recid":"1071","relation_version_is_last":true,"title":["根管形成のガイドライン"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-06-19T08:22:48.157074+00:00"}