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Volume 56 (2006)
- Issue 5 Pages 660-
- Issue 3 Pages 220-
- Issue 2 Pages 126-
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Volume 56, Issue 2
Displaying 1-10 of 10 articles from this issue
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ORIGINAL ARTICLE
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Toshikazu UCHIYAMA, Seigo KOBAYASHI, Chieko TAGUCHI, Touru HAYAKAWA, Y ...Article type: Article
2006 Volume 56 Issue 2 Pages 126-131
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSRecently, titanium and its alloy have been widely used in clinical applications such as denture bases, dental implants, crowns, or orthodontic wires, because they have high corrosion resistance, superior chemical stability, and biocompatibility. However, it was reported that the corrosion resistance of titanium and its alloy was decreased in fluoride containing solution, which is clinically used for the prevention of dental caries. But these reports were based on an in vitro study. The purpose of this study was to evaluate the effects of the corrosion resistance of titanium and its alloy in the presence of fluoride close to the clinical condition. Titanium and its alloy (Ti-6Al-4V) were immersed in fluoride prophylactic agents (NaF solution: NEO^<TM>, 9,000ppm F or F-rinse solution: Miranor^<TM>, 450ppm F) and then artificial saliva. After immersion, a differential colorimeter was used to assess the degree of corrosion. Morphological changes in the titanium surface were examined by a scanning electron microscope (SEM). The mean color change values (ΔE) were statistically analyzed by the west at a significance level of p=0.05. There were no significant differences in ΔE values between before and after immersion in F-rinse solution or NaF solution for titanium and Ti-6Al-4V. SEM images demonstrated similar surfaces before and after immersion in F-rinse solution as well as NaF solution for titanium and Ti-6Al-4V. These results indicate that there is no problem in the clinical dental practice whereby titanium and Ti-6Al-4V contact NaF solution or F-rinse solution.View full abstractDownload PDF (980K) -
Katsuhiro KITADA, Masakazu INOUE, Takahiko OHOArticle type: Article
2006 Volume 56 Issue 2 Pages 132-136
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSStreptococcus anginosus group comprises a part of the normal flora in the human mouth and is closely associated with pyogenic infectious diseases in various body sites. It has been demonstrated that various kinds of antibacterial and medicinal ingredients are contained in green tea leaves, and tea extracts have antimicrobial effects against cariogenic and periodontopathic bacteria. Here, we report the antibacterial effects of green tea extracts against S. anginosus group. Against the 18 strains of oral bacteria including S. anginosus group (S. anginosus, 7 strains; S. constellatus, 3 strains; S. intermedius, 4 strains), the antibacterial effects of green tea extracts were tested. Three strains of S. intermedius and one of S. constellatus were sensitive to tea extracts. However, no strains of S. anginosus showed sensitivity to the extracts. Next, we examined whether the effects of the extracts were bactericidal or bacteriostatic using two species of bacteria which showed strong sensitivity. Against the 2 strains of S. constellatus NCTC10708 and S. intermedius K201K, the extracts showed a growth inhibitiory effeet, and the effect was bactericidal.View full abstractDownload PDF (520K) -
Masahiro TAKAHASHI, Mitsuo KISHIArticle type: Article
2006 Volume 56 Issue 2 Pages 137-147
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSTongue coat samples were collected from 292 subjects consisting of 85-year-old individuals, periodontally healthy young adults in their 20^s and middle aged patients who received a regular dental check up for maintenance after periodontal treatment. Four species of periodontopathogens and two species of mutans streptococci were detected from the tongue coat samples using species-specific polymerase chain reaction. Dental plaque samples were also collected from periodontally healthy young adults, and six species were detected similarly. The results were follows: 1. The rate of bacterial detection from dentulous elders was highest in all subjects, on the other hand, that from edentulous elders was lowest in all subjects. 2. There was a significant relationship in that the bacterial species found in the tongue coat were the same as those in the dental plaque. Concerning periodontopathogens except for Treponema denticola, the detection rates from the tongue coat samples were higher than those from the plaque samples. Furthermore, when certain bacterial species were detected from either sample, they were detected from the tongue coat samples in most cases. 3. The detection rate of Streptococcus mutans from the tongue coat samples showed no significant difference. Concerning Streptococcus sobrinus, the detection rate from denture wearing subjects was higher than subjects without dentures. 4. In periodontally healthy young adults, the detection of T. forsythensis, P. intermedia, and S. sobrinus was associated with the amount of tongue coat, which had a strong relationship with a smoking habit From these results, it was suggested that the tongue coat interacted with other niches in the oral cavity, acting as a possible reservoir or receiver, and consequently, it could influence total oral microflora.View full abstractDownload PDF (1265K) -
Hisako SASAHARA, Shinsuke SADAMORI, Kazuhiro TSUGA, Makoto KAWAMURAArticle type: Article
2006 Volume 56 Issue 2 Pages 148-155
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSThe aim of this study was to investigate the present state and progress of temporomandibular disorders in adolescents, and the relationship between the present state, progress and the occlusal condition. The first grades of some universities and vocational schools were asked to complete a questionnaire regarding the condition of the temporomandibular joint. Then one examiner measured their occulusal condition using pressure sensitive sheets, "Dental Prescale^[○!R] 50H, type R" (Fuji Photo Film, Co.). The following results were obtained: 1. The present state and progress of temporomandibular disorders 1) Though about half of the subjects had experienced temporomandibular disorders, few subjects with temporomandibular disorders had problems in daily life. 2) The condition of temporomandibular disorders was mainly good or stable, and it was rare that the condition actually worsened. Only 21 students experienced an improvement of the condition by medical treatment. 2. The relationship between the present state, progress and the occlusal condition 1) The females with better conditions had a larger total occlusal contact area and greater total bite force. 2) The males with better conditions of the temporomandibular joint had a smaller available occlusal contact area (the area with occlusal pressure under 120 MPa, since the Dental Prescale^[○!R] showed 120 MPa, even if the pressure was over 120 MPa.) and greater maximum occlusal pressure. Therefore, it was suggested that temporomandibular disorders were very common in adolescents, patients with advanced disorders were rare, and many patients might recover without medical treatment. About the relationship between the present state, progress and the occlusal condition, more consideration is necessary to account for differences between the sexes.View full abstractDownload PDF (836K) -
Yuko TOYOSHIMA, Toshiyuki SAITO, Yoshihiro SHIMAZAKI, Yoshihisa YAMASH ...Article type: Article
2006 Volume 56 Issue 2 Pages 156-160
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSWe conducted dental, periodontal, and occlusal examinations of 84 professional baseball players to examine the relationship between oral health and occlusal condition. Occlusal force, contact area, pressure, and balance were measured using pressure-sensitive sheets. The occlusal force and contact area decreased as the numbers of decayed and missing teeth increased. The occlusal pressure tended to increase with the numbers of decayed and missing teeth, while the number of severe dental caries was significantly inversely correlated with the occlusal force (p<0.05). When the subjects with dental caries on only one side of the mouth (left or right) were examined, the occlusal force (p=0.02) and contact area (p=0.01) on the side with the decayed teeth were significantly smaller than on the opposite side. Conversely, the maximum (p=0.03) and average (p=0.09) occlusal pressures were greater on the side with the decayed teeth. The results indicate that severely decayed teeth, or a decrease in the number of teeth, influence not only the occlusal force, but also the balance in the occlusal condition between the left and right sides of the mouth.View full abstractDownload PDF (669K) -
Kaichi HASEGAWA, Noriko SATO, Yasuhiro IKEDA, Ken YAEGAKIArticle type: Article
2006 Volume 56 Issue 2 Pages 161-170
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSThe BANA test and Perio Check test utilizing dental plaque were developed to examine periodontal conditions. These tests are very easy to use, with practitioners carrying out simple procedures within their own dental practices. However, such tests provide us with very limited information. We are trying to develop a laboratory test at present for judging periodontal conditions. On the other hand, these tests determine proteolytic activity in plaque. It is difficult to use these tests for epidemiological work because sampling sublingual plaque is not so simple here. Salivary components instead of plaque can provide samples for the examination of periodontal conditions. Furthermore, some peptides in saliva demonstrate specific segmentations during proteolysis in saliva. In this study, we examined the mechanisms of segmentation of Histatin 5 by proteolytic activities of human salivary sediments. We found six peptides: DSHAK, HHSHR, HHGYK, HHGY, GY, and RHHGYKRK, during trypsin digestion. After two hours of incubation with human salivary sediments, five peptides, HHGYKR, HHGYK, HHGY, GY, and RHHGYKRK, were found. After four hours of incubation, Histatin 5 had almost disappeared. HHGYKR, HHGYK, and GY were increased, but HHGY and RHHGYKRK were reduced. We examined fragmentation of the N-terminal peptide, DSHAKR, by the salivary sediments. It was found that 90% of the peptide was digested after two hours incubation, but a small amount of DSHAK was newly produced. Histatin 8, which is a C-terminal peptide of Histatin 5, was completely digested within two hours of incubation. It was suggested that assay of the proteolytic activity of salivary sediments using salivary Histatin 5 should be employed for judging periodontal conditions. Further clinical studies are required.View full abstractDownload PDF (865K) -
Takashi UEKUBO, Tomoko HAMASAKI, Satoko KAKUTA, Kouichi SOGABE, Shuji ...Article type: Article
2006 Volume 56 Issue 2 Pages 171-177
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSThe purpose of the present study was to clarify the prevalence of periodontal disease in the rice-cultivating Yayoi people of ancient Japan. The cementoenamel junction-alveolar crest (CEJ-AC) distance was examined in 295 ancient human bodies, excavated from 57 archaeological sites considered to belong to the Yayoi period in Japan (ca. 500 B.C. -300 A.D.). They were categorized by age into the adolescent group (12-39 years old, n=140), elderly group (40-70 years old, n=147), and unknown (n=8). The severity of periodontal disease was mild in the adolescent group, whereas it was aggravated in the elderly group, who also showed marked alveolar bone loss. Periodontal disease tendency was most remarkably observed in the first molar. Periodontal disease tended to become aggravated with aging in Yayoi people. We concluded that there was a higher prevalence of severe periodontal disease in the present study population as compared to reports of other ancient human peoples.View full abstractDownload PDF (641K) -
Takuo ISHII, Mahito OKADA, Yoshikazu OKAWA, Yutaka WATANABE, Chika KUR ...Article type: Article
2006 Volume 56 Issue 2 Pages 178-186
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSIn Japan, many dependent elderly people living in long-term care insurance (LTCI) facilities nave acute histories of cerebrovascular accident. The purpose of this study was to investigate the current status and management of oral health care for elderly people residing in LTCI facilities. We selected 15,722 LTCI facilities through the internet homepage "U-raku", which is a welfare information network, using four key phrases: "Welfare facilities for elderly people requiring nursing care", "Health facilities for elderly people requiring nursing care", "Medical institutions for recuperation through nursing care", and "Group home". A random sampling of 1,000 facilities was carried out for each category of institution. A questionnaire was then mailed to 4,000 LTCI facilities to be returned by mail (n=1,713, response rate=42.8%). The results showed that 91.4% of fundamental care plans in LTCI facilities included oral health care; however, an actual check on how oral health care was being implemented revealed a rate of approximately once per month in the majority of facilities. A large number of care personnel in LTCI facilities were in charge of checking on oral health care. The LTCI facility staff, however, had received little education on oral health and related issues in their training. The response to a question on oral health care showed that the number of patients receiving treatment from visiting dentists was about the same as the number of residents visiting dental clinics. The results of this study suggest that dental health personnel should work together with care personnel to provide regular oral health care for elderly people in LTCI facilities.View full abstractDownload PDF (1038K) -
Eiji NIIHARA, Masako MORIKAWA, Yasuhiro IKEDA, Ken YAEGAKIArticle type: Article
2006 Volume 56 Issue 2 Pages 187-191
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSNitrite, which is carcinogenic to the digestive organs, is produced through the metabolic activities of oral microorganisms. Most nitrite in the stomach is believed to originate from the oral cavity. It was reported that reducing nitrite production in saliva by antibiotics decreased the cancer incidence rate, and that nitrite was never produced without salivary components. Controlling these salivary factors may reduce the nitrite concentration in the oral cavity, and might result in a reduced cancer risk. Therefore, we investigated salivary components producing nitrite in this study. The factors required for nitrite production were found in the fraction of MW 500 or less, and these factors showed a low polarity. Thiocyanate and hydrogen peroxide did not demonstrate any nitrite production, but the mixture of thiocyanate and hydrogen peroxide did. Glucose, fructose, maltose and sucrose were also found to produce nitrite. Therefore, carbohydrate or hydrogen peroxide might be an important factor for nitrite production in saliva. Hence, improving oral hygiene and/or decreasing carbohydrate presence by oral health activities might reduce cancer risk in digestive organs.View full abstractDownload PDF (584K) -
Yoshihiro SHIMAZAKI, Toshiyuki SAITO, Yoshihisa YAMASHITAArticle type: Article
2006 Volume 56 Issue 2 Pages 192-197
Published: April 30, 2006
Released on J-STAGE: March 23, 2018
JOURNAL FREE ACCESSThis study examined the effectiveness of the Community Periodontal Index (CPI) for detecting periodontal pockets during oral examinations for periodontitis based on the health law for the elderly. The subjects were patients in the Department of Preventive Dentistry at Kyushu University Hospital who had 20 or more teeth. We examined the concordance rate of detecting patients with periodontal pockets (one or more teeth with a periodontal pocket≥4mm) between the CPI and full mouth periodontal examination on the basis of probing pocket depth at six sites around every tooth. The concordance rate with full mouth examination was 97.2% when CPI code 3 was used for detecting patients with periodontal pockets in the examination of 10 representative teeth of the CPI. The concordance rate between periodontal examination based on the health law for the elderly and full mouth examination was 88.9%. When every second molar was targeted to simplify the examination, the concordance rate for detecting patients with periodontal pockets was 93.1 %. When we examined the relationship between the number of sextants with CPI code 3 or 4 and the number of teeth with periodontal pockets (≥4mm), the number of teeth with periodontal pockets increased as the number of sextants with CPI code 3 or 4 increased, suggesting the degree of spread of periodontitis. These results suggest that detecting patients with periodontal pockets using the CPI has a high concordance rate with full mouth examination. When time is limited, the CPI can be simplified with little loss in efficiency.View full abstractDownload PDF (647K)
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