Shigaku = Odontology; journal of Nihon Dental College最新文献

{"title":"[Dental implants. History and tissue reactions of implants].","authors":"M Katagiri","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Dental implant (oral implant) is totally based on dentistry and the progress in its technology. On this occasion, dental implant are described from the standpoints of experimental pathology and clinical pathology. Demands for improved dental technology have brought significant developments in the dental implant field. Based upon the latest general implant technology, improvements in dental implant technology have primarily taken the form of better materials and designs historically. The object of these developments has been to provide the patients with restored teeth whose structure and function are asymptotically close to those of natural teeth while enhancing recovery of the occlusion function and improving aesthetic quality by means of applying technique of oral surgery (including periodontics) and prosthodontics. The basic structure of the dental implant consists of the substructure buried in the jaw bone, the junction, and the superstructure projected into the oral cavity. These three items correspond respectively to the root, the neck, and the crown of a natural tooth. However, neither the structure nor the function of such an implant body can be identical to those of a natural standing tooth. Physiologic metabolism, which is present in the latter, does not exist in the former. Therefore, it should always be remembered that even modern technology and materials can not reproduce the oral conditions identical to those produced by physiologic tissue and functions which are subject to chronological change. We should bear in mind that this system, unlike those made up by inter-material relations or inter-organic relations is made of an artificial structure, functions apart from the natural organs, and serves only as a substitute. Certain inherently unstable factors are inevitable. For example, radiographic findings confirm that V-shaped radiolucency by bone resorption in the alveolar bone surrounding the tooth neck is always more extensive than in the case of natural teeth. First study: Histopathological Studies of Tissue Reaction for Implant Materials(Fig. 4-10). This study is a basic experiment to help the development of implant materials used in repairing extraction wounds of teeth and bone defects. It is desirable that the materials should be preservable, easy to process, and with high histocompatibility. Examined materials are DCFF or non-DCFF treated bone matrices (grafts) of rats and human, and single crystal ceramics (Al2O3). DCFF treatment is a procedure of decalcifying, defatting and freeze-drying bones and ligaments of animals after fixation in formalin for immunological tolerance (M. KATAGIRI got a patent for this invention in America, West Germany and Japan, Table 1).(ABSTRACT TRUNCATED AT 250 WORDS)</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 SPEC","pages":"1152-61"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633345","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":"Gap measurement between composite fillings and cavity walls in three different cavities.","authors":"Y Katoh,&nbsp;K Shinkai","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Adaptabilities of 8 kinds of resinous restorations on class 5, cervical, and root surface cavities were compared and examined. Human extracted premolars were used as experimental specimens. Restored specimens were divided into two groups: a short storage group stored for 2 weeks and a long storage group for 6 months. After thermal cycling had been undertaken with each group during storage, replicas on vertical section were made to be observed by SEM, the gaps of which were measured on the photographs. These following conclusions were obtained as a result: 1. The appearance and width of gaps between resin and cavity walls were characterized by kinds of cavities. 2. In the class 5 cavity gaps were observed on cavity floor, while almost no gaps were observed in other areas which shows fine adaptability. 3. In the cervical cavity gaps appeared in only cavity floor and on gingival wall. 4. In the root surface cavity the gaps were observed on all cavity walls, whose width was smaller on occlusal wall and especially wider on cavity floor. 5. Clearfil-F and Clearfil-FII showed fine adaptability on all cavities in general, especially on dentinal cavity wall. 6. Isopast without bonding agent and Pile-A as control showed wider gaps than the other adhesive resin. 7. Almost all the materials showed a tendency to form gaps which increased over the passage of time. The difference of width, however, varies depending on the materials; especially stable in Clearfil-F and Clearfil-FII their adhesive power showed no decrease during the experimental period.</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 3","pages":"888-97"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13635574","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":"[Clinical evaluation of the GaALAs laser treatment for hypersensitive dentin].","authors":"M Sato,&nbsp;Y Ozawa,&nbsp;M Masaya,&nbsp;Y Uchikawa,&nbsp;S Tosaka,&nbsp;T Okumura","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The methods available for treatment of hypersensitive dentin include the application of heavy metal salts such as diamine silver fluoride to the tooth, iontophoresis, Hyper-Band patching and restoration with various filling materials following cavity lining. Laser beam therapy, which has recently been used in dental treatment, is also expected to be applied to the treatment of hypersensitive dentin. In the present study, we obtained interesting results from the clinical use of a GaAlAs semiconductor Laser (Semilaser Nanox LX-800, GC Co.). The subjects were 63 patients with hypersensitive dentin: 8 patients without the exposed root, 40 with the exposed root, 21 treated with filling materials, 5 given Hyper-Band treatment, 14 with wedge-shaped defect, attrition or abrasion, and one with primary caries. Twenty-six fell into two or more categories. The effect of treatment was assessed by a single examiner in order to minimize error of estimates. Each lesion was directly irradiated for less than 3 minutes, and assessment of the result was conducted according to the criteria and method of Suzuki and Ishikawa. The results were as follows: The treatment was markedly effective in 44 (69.8%), effective in 12 (19.0%) and not effective in 7 (11.1%) of 63 patients. No case of exacerbation was found. The efficacy rate was 88.9%.</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 3","pages":"813-21"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13635701","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":"[Clinico-statistical study of medical complication in dental patients].","authors":"K Shibasaki,&nbsp;I Mataga,&nbsp;K Tsuchikawa,&nbsp;M Tsuchimochi,&nbsp;J Kato","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Eight hundred and fifty two cases, who were introduced from the Dental Hospital to Department of Internal medicine, Medical Hospital at Niigata, The Nippon Dental University, were examined for medical complications. About one hundred and fifty cases were introduced per year from the Dental Hospital, which consisted of about 15% of the total outpatients in the Department of Internal medicine. The age distribution showed a high incidence of patients in their 50's. The number of patients over 60 years old was 220 (25.8%), and the number of patients over 65 years old was 160 (18.8%). There was then a high percentage of elder patients. The reason for the initial medical examinations was the need for a pre-operative medical examination in 42.6% of the total cases. Concerning medical complications among the patients, the highest incidence was hypertension in 116 cases (13.6%); the second highest was hepato-biliary and pancreatic diseases in 114 cases (13.4%); and heart diseases in 81 cases (9.5%). Eighteen cases of HBs antigen positive (2.1%) were seen among the patients with liver diseases. Among those with blood diseases, anemia showed the highest incidence, and a small number had leukemia and hemophilia. Diabetes mellitus showed up in 39 cases (4.6%), most of them being more than 40 years of age. Mentally and physically handicapped patients accounted for 30 cases. Half of them were from the pre-operative examination area, like tooth extraction.</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 3","pages":"1042-9"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13679407","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":"[Prosthodontic considerations in implant therapy].","authors":"Y Hata","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Numerous factors affect the success or failure of the various intra-osseous implants. In particular, such considerations as the implant materials, properly selected or not, preceded by careful patient screening and thorough analysis of soft and hard tissues, implant insertion conditions, oral hygiene and the overlying prostheses determine the success of the implant therapy. Among these, the final overlying prostheses serve two major purposes of restoring lost masticatory function and esthetic improvement. In addition, due to the intimate relationship with the health and remodeling of the surrounding tissues, the prostheses must be designed with the utmost care. Analyzing this kind of osteointegrated system from the histologic standpoint of the implant/bone relationship, one can roughly classify this system into three types. One is a fibro-osseous integration yielded by enveloping with fibro connective tissue. The other is osseointegration by directly contacting with bone. Lastly, the osteoankylosis form whereby fusion of the implant and bone takes place. Irrespective of the different types and a basic physical principle applied, the function of the final prostheses should be to transmit occlusal force widely to the supporting cortical and basal bones (i.e., jaw bones) via the implant device without creating any undesirable concentrated, rotational or lateral force. Therefore, the final prostheses are not designed independently or after the implant operation. Instead, the prostheses design comes first, followed by careful analysis of the opposing occlusion, proximal dentition and other intraoral structures. Based on the determined existing intraoral environment, the particular type of implant and its form is selected to fit the individual case. Preoperative procedure requires articulator mounted study casts to evaluate the opposing occlusion and implant positioning from which the mesiodistal and buccolingual positioning is determined. Subsequently, the final prosthesis design is prewaxed and the required number of implants and their interspan distances are determined from the wax-up. Next, the Surgical Guide Plate device is employed to help determine radiographically the implant positioning and the anatomical jaw morphology. As mentioned earlier, the purpose of the final prosthesis is to restore the lost masticatory function and esthetic improvement along with presservation of the remaining teeth and harmony with the intraoral soft and hard tissues. Implants serve a critical supportive role of helping the success of the final prosthetic treatment. Intraosseous implants can be used as independent support system or can be combined with remaining natural dentition to support the overlying prosthesis.(ABSTRACT TRUNCATED AT 400 WORDS)</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 SPEC","pages":"1162-72"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633970","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":"[Study of automatic cephalometric analysis by digital image processing].","authors":"I Maizumi","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>In the lateral roentgenographic cephalometric analysis, a certain degree of errors is unavoidable as it involves a lot of manual work in tracing, landmark setting, measurement and registration. To minimize the chances of errors creeping in, efforts have been made toward the mechanization of manual work. For measuring and registering automatically, a roentgenographic cephalometric system using a personal computer is available. Attempts have also been made to automatically obtain landmarks on tracings by the use of a computer. However, tracing still has to be performed by hand. The circumstances are such that the development of a full-scale scanning system that can perform automatic tracing on cephalometric radiographs in being eagerly awaited. The present study concerns the possibility of using a small-size computer mainframe in a small-scale clinical laboratory which cannot afford to install a large one. A digital image processing system using a personal computer was devised to process cephalograms. And a the anatomical complex on the screen was developed. To examine the acuracy of the drawings, comparisons were made between manual tracings and computer-aided tracings. The results were as follows: 1. In both vertical and horizontal components at Pog, Gn and Me points, computer tracings were matched significantly well with manual tracings. 2. At the points of Or, ANS, A and Go, only vertical components were matched significantly well with those obtained by manual tracing. 3. In the program developed for the present study, the computer had a greater tendency than man to draw the borderline along the higher density area when the gray level gradient was not sharp.</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 3","pages":"822-38"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13635571","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":"[Study on thermal pulp testing of immature permanent teeth].","authors":"H Karibe,&nbsp;Y Ohide,&nbsp;H Kohno,&nbsp;H Sugiyama,&nbsp;M Ueno,&nbsp;S Kikuchi,&nbsp;M Takagi,&nbsp;M Miura,&nbsp;E Mizorogi","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The duration of reaction to cool stimulation was investigated in 185 normal maxillary right and left central and lateral incisors from 55 pediatric patients aged from 6 to 15 years, who were brought to the Department of Pedodontics of Nippon Dental University Hospital, and from 9 students aged from 19 to 20 years in the School of Dental Technology and Hygiene affiliated with Nippon Dental University by using Dichloro-Difluoro-Methane coolants [PULPER (G-C Dental Industrial Corp.) and PULPOFLUORANE (Septodont Co.)] in order to determine the efficacy of thermal pulp testing for mature and immature permanent teeth. The results obtained are as follows: 1) The mean duration of reaction to cool stimulation according to the type of teeth was 0.93 sec for the maxillary left lateral incisors, 0.91 sec for the maxillary left central incisors, 0.88 sec for the maxillary right central incisors and 0.95 sec for the maxillary right lateral incisors, showing no statistically significant difference in the duration between the tooth types. 2) The duration of reaction to cool stimulation according to age was shortened with aging except for the 6-year-old patients. 3) The patients were divided into those 10 years old or younger and those older than 10 years because the tooth roots of the maxillary anterior teeth are developed at 10 years of age. The mean duration of reaction to cool stimulation was 1.02 sec in the group with immature permanent teeth, which consisted of patients aged 10 years or younger, while it was 0.82 sec in the group with mature permanent teeth, which consisted of patients aged 11 years or older.(ABSTRACT TRUNCATED AT 250 WORDS)</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 3","pages":"1006-13"},"PeriodicalIF":0.0,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13635697","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":"[Anatomical studies on a supernumerary tooth considered to be a successional tooth of the lower first molar].","authors":"M Takahashi,&nbsp;K Kikuchi,&nbsp;T Eguchi,&nbsp;K Miyata,&nbsp;Y Asami,&nbsp;I Sasagawa,&nbsp;K Maeda,&nbsp;K Nishimura,&nbsp;K Kobayashi","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The purpose of this study is to investigate features of the successional tooth of the lower first molar. Materials investigated in this study deal with a supernumerary tooth formed at the distolingual deep part to the lower right first molar of a male patient aged twenty-four. It was observed with binocular microscopy and under X-ray. The occlusal surface of it was observed with scanning electron microscopy. Horizontal ground sections of it were prepared and observed with polarizing microscopy, fluorescent microscopy, and scanning electron microscopy. It is thought that this supernumerary tooth is a true successional tooth of the lower first molar because it was formed at the distolingual deep part to the lower first molar and the fissure of it is Y-shaped and it has five cusps. It is considered that two impressions at buccal and distal surfaces of it isn't original hereditary features but was accidentally formed by pressures of mesial and distal roots of the lower first molar. The rough form of it has most resemblance to the lower second premolar and distal and lingual parts of it are smaller than that of the lower first molar. But fundamental features of the lower first molar are preserved in it. It is thought that the center of the molarization field of human lower successional teeth lies at the successional tooth of the lower first molar because the form of the occlusal surface of it is more complex and functional than those of the lower first and second premolars.</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 2","pages":"651-62"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13633611","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":"[Stereo architecture of the connective tissue papillae of lips and gingiva in newborn dogs].","authors":"T Asami,&nbsp;K Kitajima,&nbsp;Y Asami,&nbsp;K Kobayashi","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The surface structure of the connective tissue papillae of lips and gingiva of newborn dogs 1 and 4 weeks after birth were observed by scanning electron microscopy. 1. Long term HCl treatment successfully removed the epithelial cell layer from the connective tissue over a large area of fixed material. 2. Connective tissue papillae of labial skin, labial mucosa and alveolar and gingival mucosa were exposed and it became clear that connective tissue papillae were highly developed at the labial margin and just beneath the gingival margin. 3. In the hair growing area of the labial skin, connective tissue papillae became smaller, and some ridge-like structures were found running vertically. 4. On the lining mucosa such as the labial and alveolar mucosa, the surface of the connective tissue papillae showed only ridge-like structures running vertically. 5. From the results of both light and electron microscopy, we concluded that there was a tendency for the area to have a thick epithelial cell layer which contained highly developed connective tissue papillae. This suggested that the blood vessels in the connective tissue papillae can carry nutrients closer to more epithelial cells penetrating deeply into the epithelium thickness.</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 2","pages":"464-71"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13634456","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":"[Anatomical study of the human lingual muscle. Myofibrous organization of the extrinsic muscles].","authors":"A Ohgaki,&nbsp;T Sato","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>The organization and distribution of fibre types in the extrinsic human muscles of 34 males and 19 females were determined by Sudan black B staining. 1) According to our observation, the Genio-hyo-glossus consists of two large bundles; and upper bundle and a lower bundle. The Hyo-glossus is thin, flat and the Stlo-glossus is shorter and smaller. 2) These muscles are composed of small bundles of the fibre which could be seen under microscopic. These contain many small fatty cells. 3) The cross-sectional area (mm2) and the total number of the muscle fibres is highest in the Genio-hyo-glossus. The number of fibres per mm2 is highest in of the Hyo-glossus. The cross-sectional size of muscle fibre (micron) in the Stlo-glossus is generally larger than others. 4) Comparison with other muscles as in sucking show the muscle fibre size in the laryngeal muscles to be greatest. The Cross-sectional area and the total number of muscle fibre is greatest in the Genio-hyo-glossus. 5) Three fibre types of muscle could be discerned in terms of their reaction to pigments and cellular: red muscle fibre a positive reacted positively; white muscle fibres has a weak reaction; intermediate muscle fibres reacted intermediately. White muscle fibres are localized in the external layer, in contrast to red and intermediate muscle fibres which are localized in the inner layer of the extrinsic muscles. The percentage distribution of red muscle fibres in the Hyo-glossus and Stlo-glossus is more than Genio-hyo-glossus. These results suggest that Genio-hyo-glossus acts as a power generating force in contrast to the Hyo-glossus and Stlo-glossus which are fatigue-resisting.</p>","PeriodicalId":76539,"journal":{"name":"Shigaku = Odontology; journal of Nihon Dental College","volume":"77 2","pages":"371-87"},"PeriodicalIF":0.0,"publicationDate":"1989-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"13636685","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}