Bulletin of Tokyo Dental College最新文献

{"title":"Effects of Cuspal Inclination and Luting Agent on Fracture Load Values in Composite Resin CAD/CAM Crowns.","authors":"Gen Kuroishi, Mamoru Yotsuya, Syuntaro Nomoto, R. Hisanaga, Toru Sato","doi":"10.2209/tdcpublication.2020-0017","DOIUrl":"https://doi.org/10.2209/tdcpublication.2020-0017","url":null,"abstract":"The purpose of this study was to evaluate whether change in cuspal inclination influences the fracture load values of composite resin computer-aided design/computer-aided manufacturing (CAD/CAM) crowns. Abutment teeth and CAD/CAM crowns were prepared as they would be for treating a mandibular first premolar with two cusps. The CAD/CAM crowns were designed so that 1) the principal stress lines would be radially distributed from the two points of contact with the indenter to the occlusal area of the abutment (Type I), or 2) the principal stress lines would pass outside the occlusal area of the abutment (Types II and III). The CAD/CAM crowns were mounted on the abutments using one of two types of resin or polycarboxylate cement. Fracture load values were measured using a universal tester. The Type I CAD/CAM crowns exhibited the highest mean fracture load value, followed by the Type II crowns and then the Type III crowns, with significant differences seen between all types (p<0.05). The luting agent used (resin or polycarboxylate cement) showed no effect on the fracture load value. With the Type II and Type III crowns, significant differences in the fracture load value were observed between the Super-Bond and Hy-Bond polycarboxylate cement groups (p<0.05).","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47240401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New Method of Dental Personal Identification of Disaster Victims Using Oral Scanner.","authors":"Yasutaka Nakamura, N. Kasahara, M. Hashimoto","doi":"10.2209/tdcpublication.2021-0035","DOIUrl":"https://doi.org/10.2209/tdcpublication.2021-0035","url":null,"abstract":"Dentistry plays an important role in the identification of victims in large-scale disasters. The current poor status of and problems with victim identification work were highlighted in the aftermath of the Great East Japan Earthquake of March 11, 2011, in which some 10,000 people lost their lives. The techniques of dental identification therefore need to be improved if they are to cope with the problems associated with identification that will accompany the predicted Tokai earthquake and other unexpected large-scale disasters in the future. The purpose of this study was to determine the effectiveness of applying a digital impression-taking device employed in regular dental care to dental personal identification. The Trophy 3DI pro (Yoshida Dental) was applied to a total of 150 dental models. The diagnosis was accurate in 2,096 teeth from a sample of 2,100 comprising 1,240 non-treated teeth, 670 treated teeth, and 190 missing teeth, yielding a 99.8% level of statistical precision. These results suggest that the level of accuracy offered by this impression-taking device indicates that it would be a useful tool in establishing personal identification in disaster victims.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42400325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Treatment of Chronic Periodontitis with Periodontal Surgery Including Regenerative Therapy Using Recombinant Human Fibroblast Growth Factor-2 and Papilla Preservation Technique: A Case Report with a Two-year Follow-up.","authors":"Saki Nakane-Koyachi, K. Imamura, A. Saito","doi":"10.2209/tdcpublication.2021-0048","DOIUrl":"https://doi.org/10.2209/tdcpublication.2021-0048","url":null,"abstract":"This report describes a case of generalized chronic periodontitis requiring periodontal therapy including periodontal regeneration. The patient was a 59-year-old man who visited the Tokyo Dental College Suidobashi Hospital with the chief complaint of mobility in tooth #47. Periodontal examination at the first visit revealed that 32.1% of sites had a probing depth of ≥4 mm and 32.7% of sites bleeding on probing. Radiographic examination revealed vertical bone resorption in #26 and horizontal resorption in #12, 13, 42, and 43. Based on a clinical diagnosis of severe chronic periodontitis, initial periodontal therapy consisting of plaque control, scaling and root planing, occlusal adjustment, caries treatment, and placement of an occlusal splint was performed. Tooth #47 was extracted due to bone resorption extending as far as the root apex. After reevaluation, surgical periodontal treatment was performed at the selected site. Periodontal regenerative therapy using recombinant human fibroblast growth factor (rhFGF)-2 and papilla preservation technique was performed for #26. To reduce periodontal pockets, open flap debridement was implemented for #12, 13, 42, and 43. After reevaluation, the patient was placed on supportive periodontal therapy (SPT). Periodontal regenerative therapy with rhFGF-2 and modified papilla preservation technique yielded an improvement in angular bone resorption which has been properly maintained for two years. Periodontal therapy with open flap debridement resulted in an improvement in horizontal bone resorption. Continued SPT is needed to maintain a stable periodontal condition.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49254136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Treatment for Chronic Periodontitis with Class II Furcation Involvement: A Case Report with Four-year Follow-up.","authors":"Yurie Kitamura, H. Aoki, A. Saito","doi":"10.2209/tdcpublication.2021-0047","DOIUrl":"https://doi.org/10.2209/tdcpublication.2021-0047","url":null,"abstract":"This report describes a case of generalized chronic periodontitis requiring periodontal treatment including surgery. The patient was a 64-year-old man who visited the Tokyo Dental College Suidobashi Hospital with the chief complaint of pain in tooth #27. An initial examination revealed a probing depth (PD) of ≥4 mm at 38.2% of sites and bleeding on probing at 26.5% of sites. Radiographic examination revealed vertical bone resorption in # 27, 34, and 47, and horizontal resorption in other areas. Based on a clinical diagnosis of severe chronic periodontitis, initial periodontal therapy consisting of plaque control, scaling and root planing was performed. Both #27 and #47 were extracted due to bone resorption extending as far as the root apex. After initial periodontal therapy, sites with a PD of ≥4 mm were observed at 16.7% of sites. Furcation involvement was observed in #16, 17, 36, and 37. The need and options for periodontal surgery based on these findings were explained to the patient. Open flap debridement was implemented for #16, 17, 31, 34, 36, and 37 to reduce periodontal pockets. After reevaluation, the patient was placed on supportive periodontal therapy. The results of the periodontal examination at first visit revealed a periodontal pocket depth of 6 mm and 7 mm in #16 and 17, respectively, and class II furcation involvement in both. Periodontal therapy with open flap debridement resulted in an improvement in horizontal bone resorption where there was class II furcation involvement. This improvement has been adequately maintained over a 4-year period.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47964060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of KnockOut Serum Replacement on Differentiation of Mouse-Induced Pluripotent Stem Cells into Odontoblasts.","authors":"Yuki Furukawa, Ayano Odashima, Tatsuki Hoshino, Shoko Onodera, A. Saito, T. Ichinohe, Toshifumi Azuma","doi":"10.2209/tdcpublication.2021-0042","DOIUrl":"https://doi.org/10.2209/tdcpublication.2021-0042","url":null,"abstract":"Serum serves as a source of rich nutrients during in vitro cell culture, facilitating cell adhesion, growth, and differentiation. When culturing stem cells for transplantation, however, it must be remembered that such culture medium may contain substances potentially harmful to the proposed recipient and may even induce cellular damage. The purpose of this study was to determine whether KnockOut Serum Replacement (KSR), a chemically defined medium supplement, enhanced in vitro differentiation of induced pluripotent stem cells into odontoblasts. Cranial neural crest cells, precursors of odontoblasts, were generated from mouse-induced pluripotent stem cells. They were then cultured in serum-free Dulbecco's modified Eagle's/F12 medium containing fibroblast growth factor 8 with or without KSR. The cells cultured with KSR showed strong proliferation, acquired a spindle-like morphology, and connected with the surrounding cells. KnockOut Serum Replacement also boosted expression of odontoblast markers as measured by qRT-PCR, and increased dentin sialoprotein as assessed by immunostaining. These results confirmed that mouse-induced pluripotent stem cells differentiated into odontoblasts under serum-free conditions, and that KSR enhanced the efficiency of this process.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46645256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Expression Profiles of NOS Isoforms in Dental Pulp and Odontoblasts in nNOS Knockout Mice.","authors":"Y. Ishizuka, Mizuki Yoshida, K. Ambe, J. Sasaki, N. Sugihara, Hiroki Watanabe","doi":"10.2209/tdcpublication.2019-0003","DOIUrl":"https://doi.org/10.2209/tdcpublication.2019-0003","url":null,"abstract":"Active oxygen and free radicals are involved in metabolism in cells and tissues. Immunohistological studies of related enzymes are few, and the morphological dynamics of these enzymes in dental pulp and odontoblasts remain to be elucidated. Nitric oxide synthase (NOS) has 3 isoforms: nNOS, iNOS, and eNOS. The aim of this study was to investigate the profiles of NOS isoforms in the absence of nNOS in dental pulp and odontoblasts. Five-week-old male C57BL/6 and nNOS knockout (KO) mice were sacrificed and expression of nNOS, iNOS, and eNOS determined immunohistochemically. Expression of nNOS was positive, whereas that of iNOS was negative and eNOS weakly positive in the dental pulp and odontoblasts of the control mice. In nNOS KO mice, expression of iNOS was positive in dental pulp and strongly positive in odontoblasts, whereas that of eNOS was stronger in fibroblasts, endothelial cells in the vicinity of blood vessels in the dental pulp, and odontoblasts. Expression of nNOS was negative in the nNOS KO mice. This suggests that iNOS and eNOS compensate for nNOS deficiency in vascular endothelial cells and fibroblasts in the dental pulp and odontoblasts.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2209/tdcpublication.2019-0003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44608506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vertical Displacement in Unilateral Extension Base Flexible Removable Dentures.","authors":"Nobuyuki Horie, T. Ouchi, Rumiko Nishiyama, S. Usuda, S. Morikawa, S. Asoda, T. Nakagawa","doi":"10.2209/tdcpublication.2018-0068","DOIUrl":"https://doi.org/10.2209/tdcpublication.2018-0068","url":null,"abstract":"The need for flexible thermoplastic denture base materials has increased due to patient demand for better esthetic outcomes. Designs aimed at improving esthetic outcomes can cause difficulties for prosthodontists, however, from the viewpoint of function and maintenance. Therefore, the purpose of this study was to investigate vertical displacement in unilateral extension base denture models, comparing that obtained by flexible removable dentures with that by conventional metal clasp dentures. Models of unilateral extension base flexible removable dentures for mandibular defects were prepared. Periodontal ligament and jaw mucosa were simulated using a silicone impression material. Four types of flexible removable denture, with or without a metal rest, and two metal clasp dentures made of acrylic resin as a conventional design were used as dental prostheses. The amount of vertical displacement in the defect areas was measured under a load of 50 N at the first and second molars. Among the 6 types of dentures investigated, the amount of vertical displacement was greater with flexible removable dentures than with metal clasp dentures. This vertical displacement tended to decrease significantly, however, with the use of a metal rest with the flexible removable dentures. Esteshot with a metal rest, in particular, showed the smallest amount of displacement in the flexible removable dentures (first molar, 0.265±0.007 mm; second molar, 0.423±0.008 mm). These results indicate the importance of the application of rests in unilateral extension base flexible removable dentures. It may be useful to employ a metal rest in conjunction with a flexible removable denture to reduce load on the underlying mucosa, as is done with conventional partial dentures.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2209/tdcpublication.2018-0068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43494908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Expression of Cytokeratin in Experimentally Created Inflammatory Cyst in Vivo and in Vitro.","authors":"Ayano Nakauchi, S. Shintani, E. Kokubu, Kei Nakajima, K. Matsuzaka, Takashi Inoue","doi":"10.2209/tdcpublication.2018-0059","DOIUrl":"https://doi.org/10.2209/tdcpublication.2018-0059","url":null,"abstract":"The purpose of this study was to investigate the behavior of epithelial lining derived from Malassez's epithelial rest (MER) cells in experimentally created inflammatory cysts in vivo and in vitro. Porcine MER cells were cultured in vitro with or without interleukin (IL)-1β (1 ng/ml) or IL-6 (1 ng/ml). Cell proliferation was assessed and expression levels of CK19 and CK13 mRNA determined using RT-PCR. In vivo, a cavity was created in the first molar of Sprague-Dawley male rats and tissue repair observed using immunohistochemical methods. In vitro, treatment with IL-1β or IL-6 increased proliferation of MER cells and decreased expression of CK19 mRNA, but increased CK13 mRNA at day 1 (p<0.05). In vivo, at 2 weeks, CK19-positive epithelial cells were observed adjacent to the cementum, in the cystic lesion, and in connective tissue. At 3 weeks, they were only detected in cells adjacent to the connective tissue. Cells positive for CK13 were observed throughout the epithelium, except in cells adjacent to connective tissue at weeks 2 and 3. Exposure to IL-1β and/or IL-6 induced proliferation and differentiation of MER cells.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2209/tdcpublication.2018-0059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42834624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ten-year Clinical Trends among 575 Consecutive Oral Cancer Patients at Tokyo Dental College Oral Cancer Center.","authors":"Shoichi Sekikawa, A. Kozakai, H. Saito, Homare Kawachi, S. Ogane, M. Takano, T. Nomura, A. Katakura, T. Shibahara, N. Takano","doi":"10.2209/tdcpublication.2018-0067","DOIUrl":"https://doi.org/10.2209/tdcpublication.2018-0067","url":null,"abstract":"The facilities comprising Tokyo Dental College (TDC) -the college itself and its medical institutions at Suidobashi, Ichikawa, and Chiba - have been officially recognized as a center for treating oral cancer. The TDC Oral Cancer Center (OCC) was established on April 1, 2006. It provides comprehensive medical care, including that aimed at recovery of postoperative function, such as restoration of stomatognathic function, dysphagia therapy, and placement of maxillary prostheses. The purpose of this study was to investigate patient trends at TDC-OCC over the 10 years following its establishment in order to determine how the safe and high-quality cancer care already provided might be even further improved. Oral cancer patients attending TDC-OCC between April 2007 and March 2017 were investigated. Clinical information was obtained from medical records and analyzed, including that on patient numbers, age, sex, primary site of tumor, clinical stage, and surgery provided. There were 758 new cases, and the number of new cases showed an annual increase. Among the total number of new patients, 575 (75.9%) represented primary cases. The number of operations also showed an increase, which correlated with the increase in the number of patients. The incidence in oral cancer has increased in several countries, including Japan. Oral cancer can be observed macroscopically and touched. In contrast to with cancers at many other sites, and despite various diagnostic devices for early detection having been developed, however, cases are often advanced when first encountered. Many advanced cases were treated at TDC-OCC, and the number of reconstructive operations following progressive cancer also increased over time.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2209/tdcpublication.2018-0067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45002688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Demographics of Postgraduate Training Course at Tokyo Dental College Department of Orthodontics and Alumni Working Trends.","authors":"H. Miyazaki, E. Motegi, K. Sueishi","doi":"10.2209/tdcpublication.2018-0057","DOIUrl":"https://doi.org/10.2209/tdcpublication.2018-0057","url":null,"abstract":"The postgraduate training course at the Department of Orthodontics of Tokyo Dental College, which started in April 1975, comprises a 3-year curriculum aimed at fostering orthodontic specialists. A system of Accreditation for Orthodontists was introduced by the Japan Orthodontic Society in 1990, since which time, this postgraduate training course has also sought to provide the basic training required to obtain such certification. The purpose of this study was to investigate the demographics of the students on this course and the current work status of its graduates by means of a questionnaire-based survey. The results revealed that, when the fortieth intake of students graduated in March 2017, the total number completing the course had reached 326. The annual mean number of students on this course was 8.2, and recent years have seen a marked increase in the number of women enrolling. In total, 37.5% of the questionnaire respondents had opened orthodontic clinics; 14.8% had opened general dentistry clinics; and 42.6% were working as employees. In addition, 46.2% had an additional place of employment other than their principal place of employment, mainly at a general dentistry clinic. Regarding the field of treatment, 82.4% provided solely orthodontic treatment. We believe that this may because all the responders had completed the postgraduate orthodontics course. The rate of earning accreditation as an orthodontist was high (82.4%), with no difference in the rate of acquisition between men and women. The rate of qualification as a Board-certified orthodontist was 17.9%, with the rate of acquisition by women approximately half of that by men. The number of female orthodontists is rising, and no difference was observed between sexes in the rate of acquiring accreditation as an orthodontist. Women were found to be lagging behind men, however, in regard to the rate of advancement to masters/PHD programs; qualifying as a Board-certified orthodontist; opening an orthodontic practice; and number of days worked. These findings suggest that there are differences in regard to the actual working conditions among the alumni of our postgraduate orthodontic training course, and that these differences are sex-based.","PeriodicalId":45490,"journal":{"name":"Bulletin of Tokyo Dental College","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2209/tdcpublication.2018-0057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47968949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}