@article{oai:niigata-u.repo.nii.ac.jp:00026271,
 author = {古沢, 寛},
 issue = {2},
 journal = {新潟歯学会雑誌, 新潟歯学会雑誌},
 month = {Dec},
 note = {Recently microelectrical current for accelerating bone fracture healing and bone remodeling has been employed by many investigators. From the standpoint of bone histomorphometry, this study took aim at clearing the effect of pulsed microelectrical current on mandibular bone under tooth depression. Ten crossbred adult dogs were engaged in this study. Seven were supplied 1 Hz, 10μA pulsed (monophasic) direct current at the right side and mandibular second premolars of both sides were depressd. They were called current groups for investigating the influence of electrical current under tooth depression. The other were supplied no electrical current and only the right second premolars were depressed. They were called depression groups for inspecting the effect of tooth depression. In each mandibular bone of current group, there were placed a intramarrowish cathode (made with teflon-insulated 1.0φ Kirschner wire inserted through cortical bone to marrow cavity) and a subepithelial anode (made with 0.7φcircularized Kirschner wire) at the right side. They were supplied 1 Hz, 10μA pulsed direct current. At the left side, the same procedure was carried out and no current was supplied. Seven days after initiation of current supply, lower second premolars of both sides were depressed 2mm during next seven days and retained until termination of the experiment. In the depression group, seven days after placing depression appliance, only the right second premolar was depressed 2mm during next seven days and retained until termination of the experiment. Every dog was performed tetracycline double labeling as a bone marker. At the time of 2, 3, 6, 9, and 12 weeks after initiation of the experiment, they were killed. Undecalcified transverse thin sections were prepared and, on the each section, cortex area was devided into three portions; buccal, lingual, and basal. Parameters (Ar, osAf, Mo, Sf, Vf, Sfract (r) and Sfract (f); after Takahashi and Frost) were measured and calculated in each portion. In addition to measuring parameters, polygons were drawed about Mo and Sf for investigating their distribution changes. In the depression group, each parameter showed tooth depression might not affect the basal portion. But from the views of polygons of dimentional distribution of Mo and Sf, each portion showed these distributions of depression side tend to be more flat than those of undepressed. This might show Mo and Sf were affected by tooth depression and even basal portion had received the effect of tooth depression. In the current group, comparing current side with another, Vf showed higher value, and in the after-9-week groups, it significantly increased in the all portions. Its principle reason might be the increase of activation frequency. Concerning with the polygons of Mo and Sf in the current group, these distributions tend to become flat by tooth depression and electrical stimulation might intensify this tendency.},
 pages = {9--31},
 title = {歯の庄下に際してパルス波微小定電流(矩形波)が下顎骨のRemodelingに及ぼす影響に関する実験的研究},
 volume = {9},
 year = {1979}
}