title: Cytological Kinetics of Periodontal Ligament in an Experimental Occlusal Trauma Model.
abstract: Using a model of experimental occlusal trauma in mice, we investigated cytological kinetics of periodontal ligament by means of histopathological, immunohistochemical, and photographical analysis methods. Periodontal ligament cells at furcation areas of molar teeth in the experimental group on day 4 showed a proliferation tendency of periodontal ligament cells. The cells with a round-shaped nucleus deeply stained the hematoxylin and increased within the day 4 specimens. Ki67 positive nuclei showed a prominent increase in the group on days 4 and 7. Green Fluorescent Protein (GFP) positivity also revealed cell movement but was slightly slow compared to Ki67. It indicated that restoration of mechanism seemed conspicuous by osteoclasts and macrophages from bone-marrow-derived cells for the periodontal ligament at the furcation area. It was suggested that the remodeling of periodontal ligament with cell acceleration was evoked from the experiment for the group on day 4 and after day 7. Periodontal ligament at the furcation area of the molar teeth in this experimental model recovered using the cells in situ and the bone-marrow-derived cells.
authors.affiliation: 1. Department of Oral Health Promotion, Matsumoto Dental University Graduate School of Oral Medicine, Shiojiri, Japan.
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Takaya
authors.affiliation: 1. Department of Oral Health Promotion, Matsumoto Dental University Graduate School of Oral Medicine, Shiojiri, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Mimura
authors.affiliation: 2. Department of Hard Tissue Research, Matsumoto Dental University Graduate School of Oral Medicine, Shiojiri, Japan.
authors.forename: Saeka
authors.initials: S
authors.lastname: Matsuda
authors.affiliation: 2. Department of Hard Tissue Research, Matsumoto Dental University Graduate School of Oral Medicine, Shiojiri, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nakano
authors.affiliation: 3. Department of Life Science, Faculty of Science, Okayama University of Science, Okayama, Japan.
authors.forename: Hidetsugu
authors.initials: H
authors.lastname: Tsujigiwa
authors.affiliation: 4. Department of Oral and Maxillofacial Biology, Matsumoto Dental University School of Dentistry, Shiojiri, Japan.
authors.forename: Mihoko
authors.initials: M
authors.lastname: Tomida
authors.affiliation: 2. Department of Hard Tissue Research, Matsumoto Dental University Graduate School of Oral Medicine, Shiojiri, Japan.
authors.forename: Norimasa
authors.initials: N
authors.lastname: Okafuji
authors.affiliation: 1. Department of Oral Health Promotion, Matsumoto Dental University Graduate School of Oral Medicine, Shiojiri, Japan.
authors.forename: Takeo
authors.initials: T
authors.lastname: Fujii
authors.affiliation: 2. Department of Hard Tissue Research, Matsumoto Dental University Graduate School of Oral Medicine, Shiojiri, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Kawakami
mesh_terms: D000818:Animals; D001854:Bone Marrow Cells / Q000473:pathology; D048430:Cell Shape; D003769:Dental Occlusion, Traumatic / Q000235:genetics / Q000503:physiopathology*; D006801:Humans; D008264:Macrophages / Q000473:pathology; D051379:Mice; D008963:Molar / Q000503:physiopathology*; D010010:Osteoclasts / Q000473:pathology; D010513:Periodontal Ligament / Q000503:physiopathology*
keywords: Green fluorescent protein (GFP); Ki67; Mouse; Occlusal trauma; Periodontal tissue