@article{oai:niigata-u.repo.nii.ac.jp:00026045,
 author = {石井, 史郎 and 関, 玲子 and 野田, 忠},
 issue = {2},
 journal = {新潟歯学会雑誌, 新潟歯学会雑誌},
 month = {Dec},
 note = {In order to attain a satisfactory prognosis after root canal treatment of deciduous teeth, it is necessary to find out the possible extent of root resorption which can not be detected by preoperative X-ray films. The root canal length of deciduous teeth can not be measured exactly by the conventional electronic root canal length measurement using the impedance because of the existence of physiological and/or pathological root resorption. In this study, for that reason, we have measured the root canal length of extracted deciduous teeth by the newly designed electronic root canal length measurement using the relative values. The results obtained were as follows : 1. In extracted deciduous teeth which were resorped more than a half of the supposed original root length, most of the values measured by measurement was shorter than the actual measured values. And in some cases, the value measured by measurement was over 1.5mm shorter. But it was decided no problem clinically. 2. In extracted deciduous teeth except for the former group, the difference between the actual measured value and value measured by measurement was within 1mm., 乳歯の根管治療において､術前のⅩ線写真では発見しにくい吸収を把握することが､良好な予後を得るためには必要である｡しかし､根管長を測定しようとしても､歯根が吸収していると血液や滲出液などが根管内に存在するため､インピーダンスを用いた根管長測定器では測定が困難である｡このため今回相対値を用いた根管長測定器を使用して､抜去乳前歯の根管長測定を行った｡その結果､歯根吸収が根端部より全歯根長の1/2付近まで進行した群では､全体的に短めの値を示し､1mm以上の差もみられたが､臨床的には問題ないと思われた｡また､歯根吸収が歯根長の1/4以下の群においては､実測値と測定値の差は､± 1mm以内であった｡しかし､相対値を用いた根管長測定器は､従来あるインピーダンスを用いた根管長測定器に比べ､取扱い方が異なるため､使用に際し､熟練が必要であると思われた。},
 pages = {31--38},
 title = {乳歯における電気的根管長測定法に関する研究 第１報 乳前歯},
 volume = {21},
 year = {1991}
}