著者

淺井 知宏 三橋 晃 林 誠 坂東 信 古澤 成博 前田 英史

出版者

一般社団法人 日本歯内療法学会

雑誌

日本歯内療法学会雑誌 (ISSN:13478672)

巻号頁・発行日

vol.42, no.3, pp.166-173, 2021 (Released:2021-10-15)

参考文献数

25

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Abstract : Purpose : In 2003, a study was conducted in Japan on the use of a rubber dam during endodontic treatment. As a result, 25.4% of the Japan Endodontic Association (JEA) member group and 5.4% of the general dentists group (JEA non-member group) answered that they routinely use it. On the other hand, with the increasing interest in preserving teeth among Japanese people in recent years, interest in endodontic treatment has increased too, and the equipment and materials used have also made great progress. Therefore, we hypothesized that the frequency of use of a rubber dam might have changed, and examined it in this study. Materials and Methods : The study period was from October 2019 to November 2020, and questionnaires were conducted through workshops and seminars, etc. held by the JEA, and the Internet. The recovery rate of questionnaires was 97.5%, and responses were received from a total of 986, including 463 in the JEA member group, 100 in the endodontist/dental clinical instructor group of the Japan Endodontic Association (JEA endodontist group), and 523 in the JEA non-member group. Results and Discussion : As a result of the questionnaire, 51.5% of the JEA member group, 60.0% of the JEA endodontist group, and 14.1% of the JEA non-member group answered that they would routinely use a rubber dam. The percentages who use it on a daily basis were : 74.0%, 81.1%, and 28.6%, respectively. In addition, 65.3%, 61.1%, and 34.8% of these three groups answered that they would perform pre-endodontic build-up when necessary for root canal treatment. The JEA member group and the JEA endodontist group were aware of the necessity of the rubber dam isolation technique and pre-endodontic build-up, but the JEA non-member group seemed to have a low usage rate due to complexity and economic reasons. Conclusion : Compared to the 2003 study, it was revealed that the frequency of rubber dam use had increased significantly in both the JEA member group including the JEA endodontist group, and the non-JEA member group. In addition, more than half of the JEA member group and JEA endodontist group routinely perform pre-endodontic build-up, and one third in the non-JEA member group also perform it, suggesting increasing awareness of the importance of using a rubber dam in endodontic treatment.

著者

三橋 晃

出版者

神奈川歯科大学

雑誌

若手研究(B)

巻号頁・発行日

2002

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本年度実験の目的は,試作されたペースト/ペーストタイプ光硬化型グラスアイオノマーセメント(GIC)の有用性を調べるために,接着界面の形態学的観察ならびにCa分布,Fの歯質拡散性を計測するとともに,接着強さの測定を行った.実験材料には,レギュラー(FR-100)とフロー(FF-101)の2種類の光硬化型GIC、コントロールとして,粉/液タイプ光硬化型GICのFuji II LC(GC)と従来型GICのFuji Type II (GC)を用いた.接着界面の観察およびCa, Fの測定のために、各セメントを充填したウシ歯冠象牙質試料を37℃精製水中に1日保管後,アルゴンイオンエッチングを施し,EPMA-8705(Shimadzu)にて,接着界面のCaとFの点面分析を行った.剪断接着試験ではウシ歯冠部象牙質を#600の耐水研磨紙にて研磨し,接着面積をφ4.6mmに規定し,各歯面処理後に37℃精製水中に1日,1週,1ヶ月保管後インストロン型万能試験機にて,C.H.S.1mm/minで,剪断接着強さを算出した.接着界面の観察では,Fuji II LCに約1μm弱の明瞭な樹脂含浸層様構造物が観察されたのに対し,ペースト/ペーストタイプGICでは,明瞭な構造物は観察されないもののそれぞれ良好な接合状態を示した.象牙質へのFの平均拡散距離は,1週水中保管後で接着界面からFR-100で8.98μm, FF-101で8.53μmと,Fuji II LCの5.09μmを超える値が示された.ペースト/ペーストタイプGICの剪断接着強さは,粉/液タイプGICに比較し有意に高い値が示され,本材料の操作性及びぬれの良さによる優れた窩壁密着性が接着強さを上昇させる要因になっていることが考えられた.以上の結果から,新規2種ペースト/ペーメトタイプ光硬化型GICは,優れた歯質接着性,フッ化物(F)徐放性,操作性を有する修復材料であることが示された.