The Journal of Nihon University School of Dentistry

Journal Information
ISSN / EISSN : 0029-0432 / 1884-2984
Published by: Nihon University School of Dentistry (10.2334)
Total articles ≅ 841
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Satoshi Kohakura, Kazutaka Kasai, Isamu Ohno, Eisaku Kanazawa
The Journal of Nihon University School of Dentistry, Volume 39, pp 71-77; https://doi.org/10.2334/josnusd1959.39.71

Abstract:
A study was conducted to evaluate the relationship between morphological characteristics of vertical sections of the mandibular body and dentopfacial morphology. Cortical bone thickness, tooth inclination and bone inclination of the mandible were investigated. Among skeletal components, ANSMe distance was associated with the buccal cortical bone thickness of the P2 (second premolar) section. Gonial angle, SN to mandibular angle, and palatal to mandibular angle were negatively correlated with the buccal cortical bone thickness of P2 and M1 (first molar) sections. SNA and SNB which indicated the protrusion of the upper and lower jaws were positively correlated with the buccal cortical bone thickness of the M1 section. Among denture components, lower and upper incisor positions showed a significant negative correlation with the buccal cortical bone thickness of the P2 section. The interincisal angle was associated with the basal cortical bone thickness of the M2 (second molar) section. In summary, there were significant and complex relationships between the structures of the mandibular body and maxillofacial morphology. Facial types which relate to masticatory function are associated with the cortical bone thickness of the mandibular body.
Yohko Fukuta, Morio Totsuka, Yasunori Takeda, Hirotsugu Yamamoto
The Journal of Nihon University School of Dentistry, Volume 39, pp 86-88; https://doi.org/10.2334/josnusd1959.39.86

Abstract:
A case of a central tubercle on the lingual surface of the upper lateral incisor in a 61-year-old Japanese male is reported. The morphologic form of the central tubercle was similar to that of dens evaginatus frequently found in premolars. It was completely distinguishable from a talon cusp, which is a protrusion of the lingual cingulum. Radiographically, the present case was also complicated by dens invaginatus. We also review the Japanese literature on central tubercles of the incisal region.
, Mine Üçtasli, Hülya Can, , Mukadder Can
The Journal of Nihon University School of Dentistry, Volume 39, pp 123-127; https://doi.org/10.2334/josnusd1959.39.123

Abstract:
Fluoride release from six light-activated restorative materials, including two resinmodified glass-ionomers, two composites, and two compomers, was evaluated and compared with one conventional acid-based glass-ionomer cement. The amount and rate of release varied among the tested materials. Both resin-modified glass-ionomers and the conventional acid-base glass-ionomer cements released more fluoride then the composites and compomers (p < 0.05). Additionally, composite materials released less fluoride than compomer materials (p < 0.05). Release of fluoride by the tested materials showed a significant decrease after all the tested time intervals.
Kaoru Kusama, Shinkichi Iwanari, Kunio Aisaki, Masahiko Wada, Jun Ohtani, Kentaro Itoi, Ken-Ichi Hanai, Kouji Shimizu, , Itsuro Kudo, et al.
The Journal of Nihon University School of Dentistry, Volume 39, pp 128-132; https://doi.org/10.2334/josnusd1959.39.128

Abstract:
From 1970 to 1996, 129 cases of intraoral minor salivary gland tumors were diagnosed at the Department of Pathology, Nihon University School of Dentistry. The diagnosis of each case was based on the 1991 WHO classification. Eighty benign and 49 malignant minor salivary gland tumors were found in the approximately 9, 300 oral biopsies submitted during the 27-year period. Pleomorphic adenomas were the most commonly histologic type of the benign tumors identified and 51 % of the malignant tumors were diagnosed as mucoepidermoid carcinoma. The most common primary location of the tumors was the palate. Sixty percent of all tumors occurred in females and the peak age for incidences of all tumors was found in the third, fourth, sixth and seventh decades. These results were compared with those of the studies in different world population groups.
, Hirotsugu Yamamoto
The Journal of Nihon University School of Dentistry, Volume 39, pp 147-153; https://doi.org/10.2334/josnusd1959.39.147

Abstract:
The histologic features of normal and hyperplastic epithelia of the extra-glandular excretory ducts of human minor salivary glands were studied, and their pathologic significance evaluated. Normal duct epithelium consisted of two layers: inner columnar cells, and basal cubical or squamous cells. A few goblet cells were present among the inner cells. Hyperplasia of the duct epithelia occurred focally or entirely, and was classified into the following histologic types: (1) simple hyperplasia, and (2) metaplastic hyperplasia, which were divided into (a) mucous cell hyperplasia, (b) oncocytic hyperplasia and (c) squamous cell hyperplasia. Squamous cell hyperplasia was subdivided into (i) acanthotic type and (ii) reserve cell-like type with or without dysplasia. Simple or metaplastic epithelial hyperplasia of the extra-glandular excretory ducts of minor salivary glands may be induced by chronic inflammation or other types of irritation, and proliferating cells of such regenerating tissue sometimes exhibit features reminiscent of a neoplastic process. Furthermore, it is suggested that metaplastic epithelial hyperplasia of the excretory minor salivary gland ducts could be the site of origin of tumor development, i.e., some oral squamous cell carcinomas may arise from primary lesions in the hyperplastic epithelium of the extraglandular excretory minor salivary gland ducts.
Naoyuki Sugano, Hajime Tanaka, Koichi Ito, Seidai Murai
The Journal of Nihon University School of Dentistry, Volume 39, pp 154-155; https://doi.org/10.2334/josnusd1959.39.154

Abstract:
Fibronectin (Fn) is a multifunctional adhesive protein found on cell surfaces as well as in plasma. It is also believed to play an important role in bacterial adherence to host tissues. Molecular analyses of Fn have shown that the amino acid triplet arginine-glycine-aspartic acid (RGD) sequence functions as a binding site. We examined the role of the RGD sequence on bacterial adherence to Fn. The pretreatment of Streptococcus mitis with synthetic RGD-containing peptide reduced the number of bound bacteria to the Fn coated plates by 76%. In contrast, a control peptide containing the RGE sequence showed no inhibition. These data indicate that synthetic RGD peptides may be useful for the inhibition of bacterial adherence to Fn on host cell surfaces.
Ricardo Della Coletta, Silvio Sanches Veiga,
The Journal of Nihon University School of Dentistry, Volume 39, pp 176-181; https://doi.org/10.2334/josnusd1959.39.176

Abstract:
Rabbit polyclonal antibody against mouse EHS laminin was used to investigate the distribution and composition of laminin in the rat first molar tooth germ. Immunohistochemical analysis showed that laminin is expressed in the inner and outer epithelia of the enamel organ and in small blood vessels in the dental papilla and strellate reticulum. Immunoblots revealed that tooth germ laminin differs from EHS laminin. Tooth germ laminin contains beta chains, while the alpha 1 chain is substituted by a 300-kDa chain. Two-dimensional electrophoresis analysis of tooth germ extract showed that beta chains appeared as four spots with approximate pI values of 6.6, 7.5, 7.8 and 8.5. These results indicate that more than-one type of laminin isoform is present in the first molar tooth germ. Additionally, we have shown that despite the early degradation of tooth germ basement membrane, the laminin molecule is still intact at the time of birth.
Kazutaka Kasai, , Hirofumi Aboshi, Lindsay C. Richards, Masanobu Matsuno
The Journal of Nihon University School of Dentistry, Volume 39, pp 196-201; https://doi.org/10.2334/josnusd1959.39.196

Abstract:
The purpose of this study was to provide information about arch shape variations among South Pacific populations. The application of Fourier transforms, Y(phi i) = ao/2 + sigma (aicos phi i + bisin phi i) was used to separate two components of variation; size and shape. Dental arch size can be described by one coefficient (ao), while the shape can be summarized by the first three harmonics (amp1-3) in the Fourier series. The materials used in this study were dental casts of South Pacific populations (Fiji, Western Samoa and Kiribati), Australian Aboriginals and Japanese. Fijians, Western Samoans and Kiribati people have larger upper and lower dental arches than that of Japanese. These populations were separated by the arch size and first Fourier amplitudes which showed the arch depth/width ratio. The Fijian upper and lower dental arches were significantly larger than those found in other populations and was characterized by a wide posterior arch breadth. The Western Samoan and Kiribati arch shape was more similar to the Japanese arch shape than the Fijian. Distribution patterns of arch shape characteristics in these populations showed the same tendencies in the upper and lower arches.
, Tetsuya Ogoshi, Hidenori Ogawa, Akira Muto, Kantaro Suzuki, Kichibee Otsuka
The Journal of Nihon University School of Dentistry, Volume 39, pp 31-33; https://doi.org/10.2334/josnusd1959.39.31

Abstract:
Seven dental cyst epithelia were cultured in vitro and the conditioned media were analyzed for periodontal ligament fibroblast collagenase production. All the cyst epithelium-conditioned media stimulated fibroblast collagenase production, indicating that dental cyst epithelium, which is considered to be identical to the cell rests of Malassez, might play a role in periodontal pocket formation.
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