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-C hanges of Blood Flow in the Gingiva of the Upper Primary Incisors before and after Dental Prophylaxi s-
Mikio Kato, Koji Nakai, Tomoko Hagihara, Shiro Omichi, Nobuyuki Ishii, ...
2000 Volume 38 Issue 3 Pages
481-487
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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We conducted research to find whether the blood flow in the gingiva of children affected the condition of the gingiva. The results were as follows;
1. The blood flow between maxilary primary central incisors increased more than between primary central incisors and lateral incisors.
2. The blood flow of male children increased more than that of female children.
3. The blood flow decreased with dental prophylaxis of the gingiva.
4. The blood flow decreased more when it bled during dental prophylaxis.
The measurement of the blood flow in the gingiva seems to be useful for the clinical study of children in order to grasp the health status of the gingiva and judge the improvement of the gingivitis. Key words: Children, Gingiva, Blood Flow, Laser Doppler Flowmeter, Dental Prophylaxis
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Hiroko Yunoki, Atsushi Miyagi, Takako Nakamura, Chiho Itadani, Toshiko ...
2000 Volume 38 Issue 3 Pages
488-493
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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The present study was conducted to examine the relationships between the caries activity in mothers and caries prevalence of their children as well as the life style of the children and the status of their caries. The subjects were 98 pairs of mothers and children who participated in all of the dental health examinations at three-months, six-months, nine-months, twelve-months, eighteen-months, twenty-four-months, thirty-months, and thirty-six-months. The following results were obtained.
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Examination of the Change in Growth of the Mandible Size and Detection of the Micro Satellite Marker with Polymorphism between two Inbred Mice
Atsushi Dohmoto, Yasunori Miura, Masaru Yamazaki, Kazuhisa Okamoto, Yo ...
2000 Volume 38 Issue 3 Pages
494-501
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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To predict the changes in the shape of the mandibular while it continues to develop is quite valuable for clinics of pediatric dentistry. The genes determined mandibular shape, but it is not clear how this is in humans.
Mice having a higher homology than humans are a useful model for genetic research, and especially inbred mice with almost 100% homology at every allele are suitable to genetic crossing.
When research the genes to establish mandibular shape, we had to obtain one's size in each inbred mouse mandible as the phenotype.
It was also necessary to find out the micro-satellite markers with polymorphism between two strains of mice for linkage analysis which is useful in detecting the position of the gene on their chromosomes.
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Hitoshi Nakamura, Yoshinobu Asada, Takahide Maeda
2000 Volume 38 Issue 3 Pages
502-508
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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We have recently reported that the EL(epilepsy-like disorder) mouse is one of the most useful models for studying the development of the tooth germ. The oral manifestation of the EL strain is characterized by the high frequency of a missing third molar and non-significant localization (bot h lower and upper jaws being equally affected). The purpose of this study was to determine whether the absence of the third molars in EL mice is controlled by genetic factor(s). As an initial approach to investigate the cause of the missing teeth(MT), we performed classical genetic crosses using three inbred strains of mice, EL/sea, C 3 H/HeJ and MSM/Msf.
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Michitoki Kinehara, Kenichi Sato
2000 Volume 38 Issue 3 Pages
509-513
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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The purpose of this investigation was to determine the type and prevalence of oral injuries in children. Clinicostatistical observation was performed on 80 cases of oral injuries of children under 15years of age treated from October 1988 to September 1999 at the Division of Dentistry of Chiba Children's Hospital.
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Mitsuko Seki, Toshiko Terajima, Fumiyuki Karakama, Tetsunori Ozaki, Sh ...
2000 Volume 38 Issue 3 Pages
514-520
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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This study was performed to determine the effectiveness of two caries activity tests, these being the Site strip method (SS) and the Strip mutans method (SM), for screening adults with a high risk of dental caries, and also to evaluate the prevalence level of mutans streptococci in three statuses of different tooth surfaces involving restored, decayed, or sound tooth surfaces, using SS. Caries examination on a tooth-surface basis, collection of paraffin-stimulated saliva for SM, and plaque sampling from four specific approximal tooth surfaces of each individual for SS were performed in 125 adults, ranging in age from 21 to 25 (average age of 22 years 8 months). After that two kinds of samples were incubated for 48 hours at 37°C, in the standard MSB broth, and the prevalence level was evaluated, being given a score between 0 and 3.
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Hirotoshi Baba, Daisuke Matsui, Shohachi Shimooka
2000 Volume 38 Issue 3 Pages
521-535
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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Cases of dental caries have tended to become less and less serious throughout Japan. The same istrue of Niigata Prefecture. Since 1973, our department has conducted surveys of elementary and juniorhigh school children in a rural community of the prefecture to grasp the state of health in theiroral environment The annual surveys have also found the same tendency.
Our research in the same village focused on children who were born between from 1983 and 1986to study the incidence of dental caries. Based on the results obtained up to 1998, we examined thecaries incident in the permanent dentition according to the types of teeth, and at the same time analyzedthe correlation between the scores on the Cariostat test at the time of permanent tooth eruptionand the caries incident in the permanent dentition.
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Katsumasa Suzuki, Naotake Shibui, Hideya Shimizu, Koei Ojima
2000 Volume 38 Issue 3 Pages
536-541
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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The status of inhibition of plaque adhesion 24 hours after polishing was investigated in volunteers in order to determine how smoothened surfaces of teeth after surface polishing with Polishing Paste No.1® and Polishing Paste No.3® differed from the non-polished rough surfaces of teeth. The results obtained are as follows:
1) Plaque scores after treatment significantly differed between polished and non-polished surfaces, with a 0.01% differnce in significance.
2) Plaque scores also significantly differed between post-treatment days 1 and 2.
3) The data were not biased between of the subjects more and less skillful hands or between right and left sides.
From these results, it was confirmed that plaque adhesion can be significantly inhibited by thorough polishing of teeth surfaces with Polishing Paste No.1/No.3, compared with non-polished surfaces, even in the oral cavity of the same subject.
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Toshiomi Shirase, Hiroyuki Karibe, Kiyokazu Ogata, Tomomi Kawakami, Sa ...
2000 Volume 38 Issue 3 Pages
542-547
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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Although it is said that patients with the chief complaint of temporomandibular disorders (TMD), such as pain in the temporomandibular joint (TMJ) and/or masticatory muscles and functional abnormalities, have recently increased in number, there have been no established guidelines on routines for examination, diagnosis, or treatment of TMD.
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Shin Kitamura, Hideki Saka, Yoshinobu Ide
2000 Volume 38 Issue 3 Pages
548-561
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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The aim of this study was to elucidate the details of root resorption of deciduous teeth, such as changes in the length of the root and the resorption morphology and to investigate the relationship between root resorption and the developmental status of permanent teeth.
The study involved 159 mandibular second deciduous molars. The teeth which were examined had been extracted from children. The length of the roots was measured and divided into four classes, depending on the degree of resorption of the two roots. The degree and morphology of resorption were investigated. The mandible from dry skulls classified into four eruption stages of deciduous and mixed dentition were observed with soft radiography.
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Yoshio Itoh
2000 Volume 38 Issue 3 Pages
562-575
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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Experimental fluoride-releasable polyurethane elastomers were prepared and evaluated for their selected properties as a tooth separation device for orthodontic treatment. Two different polyurethane elastomers (E 580 and E 880) which have higher mechanical strengths were selected as the base composition. Inorganic fluoride compounds (NaF: 1.25 wt% and SnF2: 1.25-5.0 wt%) as the fluride release sources were dispersed into these base elastomers. The results were as follows:
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-About the tendency in mastication and the background factors of 3 years old infants-
Mitsuko Akimoto, Masao Ozaki, Ayako Sumiyoshi, Shigeko Watanabe, Shuit ...
2000 Volume 38 Issue 3 Pages
576-583
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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It is said that good masticatory habits are acquired during babyhood and form food intake pattern for life. However, there are few reports on methods to test the actual condition of masticatory habits during babyhood. We attempted to make a test for screening of masticatory habits during the dental examination of 3 year old infants. We also examined a the masticatory habits and the background factors. The following results were obtained.
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Tomohide Takahash, Yutaka Takamizawa, Ikuo Ohmori
2000 Volume 38 Issue 3 Pages
584-588
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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The aim of this study was to investigate whether the area covered by the acquired pellicle could be distinguished by scanning electron microscope (SEM) observation from the uncovered area and the remineralized area of the surface enamel.
The enamel surface was polished with emery paper (-#1,500) and divided into four areas. A quarter of the surface covered by plastic tape (Scotch
TM) was subjected to the control. The remainder of the surface was etched with 65% phosphoric acid for 30 sec. and the second quarter of the surface was also covered by plastic tape. The remaining half of the surface was exposed for 2 hrs to the supernatant of the centrifuged saliva to get the acquired pellicle.
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Shouji Hironaka, Kenji Kinoshita, Rieko Yokoyama, Yoshiko Hattori, Mic ...
2000 Volume 38 Issue 3 Pages
589-594
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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A clinic for eating disorders was established in May 1991 in the section of the Special clinic for Specific Disorders in the Dental Hospital of Hokkaido University. In this study, we evaluated eating functions of all of the patients who visited our clinic during 7 years and 7 months (from establishment to 1998, July) at the time of first visit.
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- Analysis of Extracted Lower Central Incisors and the Examination of Questionnaires-
Shoko Yahata, Mina Hirose, Takashi Tange, Changzhi Gao, Seiji Igarashi
2000 Volume 38 Issue 3 Pages
595-604
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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Fluoride profiles of enamel surfaces of eleven extracted lower central incisors obtained from Beijing Medical Univ. Hospital were examined in order to clarify the site differences of fluoride concentrations in the enamel. The labial and lingual sites were determined at 6 different depths (1,3,5,10,20,30μm), using the acid etched micro-sampling technique. Fluoride concentration was measured with a fluoride ion electrode.
We then compared the fluoride concentrations in the enamel among the subjects residing in Beijing with those subjects residing in Sapporo (twenty-one lower central incisors) and made inquiries about the fluoride histories as well as about the drinking habits in order better to understand the relationship between environmental factors such as drinking water or oral hygiene habits as well as the condition of the existing tooth enamel.
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Yasushi Ogasawara
2000 Volume 38 Issue 3 Pages
605-614
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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Odontoclasts are morphologically quite similar to osteoclasts but details on the difference of both cells is still not clear. There have also been no report on the cultivation of human odontoclasts. The purpose of this study was to cultivate the cells obtained from the resorbed root surfaces of the human deciduous teeth with the serum obtained from low calcium-diet rabbits, One hundred and fifty-two human deciduous teeth in physiologic root resorption were used in this study. The cells were cultivated on bone slices with serum obtained from normal-diet rabbits, serum obtained from low calciumdiet rabbits, or serum obtained from low calcium-diet rabbits containing 10-8mol salmon calcitonin. After the cultivation, tartrate-resistant asid phosphatase (TRAP) activity was detected using a light microscope. The resorption lacunae on bone slices were examined with a scanning electron microscope.
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Yoshihide Okazaki, Tomohiro Higashi, Koji Tanaka, Yasuhiro Okamoto, To ...
2000 Volume 38 Issue 3 Pages
615-621
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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This study was conducted to investigate the relationship between salivary flow rate test and salivary buffer test with caries status in 344 junior high school students.
The following results were obtained;
1. The caries prevalence, mean DF-tooth of the subjects was 91.0%,5.02, respectively.
2. The salivary flow rate test did not correlate to the caries status.
3. The salivary buffer test showed highly significant correlation with DF-tooth (p<0.001).
4. When the salivary buffer test was divided into three groups (low risk/middle risk/high risk), the mean DF-tooth group showed a significant difference among the three groups (ANOVA p<0.001). Furthermore, the distribution of caries prevalence and mean DF-tooth for the second-molar showed a significant difference among the these groups (Chi-square test, ANOVA p<0.001). From these results, it was suggested that the salivary buffer test was useful for clinical application. Key words: Salivary buffer test, Caries activity test, Dental caries
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Yoshihide Okazaki, Tomohiro Higashi, Koji Tanaka, Yasuhiro Okamoto, At ...
2000 Volume 38 Issue 3 Pages
622-628
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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The present study was to investigate the relationship between the caries activity test (Cariostat®)at 1 year-6 months of age (caries free) and the caries status at 3 years,6 years of age in 557 children. Furthermore, to investigate the relationship between the combination of Cariostat score at 1 year-6months of age and 3 years of age with caries status at 6 years of age.
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Hidenori Yoh, Yoshiyuki Ohide, Mayuri Kaneko, Takako Tsunoda, Kazuhiko ...
2000 Volume 38 Issue 3 Pages
629-638
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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The purpose of this study was to investigate the effect of the pulp in replanted immature incisors on periodontal tissue. The materials were 6 beagle dogs (5-6 month old) whose maxillary left and right second incisors were extracted, replanted and physiologically (semi-rigid) splinted. Root canal treatment (pulp extirpation and calcium hydroxide filling) was performed only on the right side incisor one weekp ost-replantationO. n the same day, the splints were removed on both the left and right. The animals were given subcutaneous injections of calcein on the day of the replantation and achromycin one week and 3,5,7 weeks post-replantationD. uring a period of 15 weeks to 25 weeks postreplantation, the animals were sacrificed by perfusion under deep anesthesia 24 hours after the final labeling (calcein). The upper jaws, including incisors, were dissected and then processed into resinembedded ground sections (100μm thick). The replanted incisors and periodontal tissues of all of the sections were examined using microradiograms, fluorescent microscopy and polarizing microscopy.
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Seize Tanase, Sayoko Yasui, Tsuguko Kondo, Wataru Otsuji, Jun Yao, Sug ...
2000 Volume 38 Issue 3 Pages
639-648
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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Regional odontodysplasia is a relatively rare condition of undertermined etiology, involving a small group of adjacent teeth in both deciduous and permanent dentitions and characterized by the defective formation of both enamel and dentin. A boy aged 3 years,1 month was diagnosed as having regional odontodysplasia with a lesion of the maxillary left molars. The affected primary second molar showed severe hypoplasia, and had a periapical abscess. The distal alveolar bone was noticeably absorpted vertically. The maxillary left primary second molar was extracted after the diagnosis. Histopathological findings showed wide interglobular dentin and pulp stone or denticles. The maxillary left first molar revealed a symptom of severe perception hypersensitiveness immediately after eruption. The affected first molar was extracted because the root was malformed. The beginning of calcification of the maxillary left second premolar was seen at age of 6 years,9 months. The tooth crown of the second premolar was malformed, while the tooth root formation seemed to be sufficient. The affected second premolar erupted at the age of 14. The maxillary left second molar erupted on the medial and paratal side, and showed a cross-bite with the lower first molar as the opposing tooth. Orthodontic treatment was performed. The affected second premolar was restored with a chrome-steel crown as temporising restoration. The distal alveolar bone of the second premolar still showed diffused radiolucency on the X-ray. The root of the second premolar formed regularly.
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Hideki Iwahori, Ichiroo Yamazaki, Hiroshi Iwasaki, Naoto Osuga, Yoshik ...
2000 Volume 38 Issue 3 Pages
649-656
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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e diagnosed a child with chief complaints of mobility and premature exfoliation of the deciduous incisors as having hypoalkaline-phosphatasia, based on clinical laboratory tests and obtained the following findings.
1. Decrease in alkalne posphatase (ALP) activity and excretion of phosphothanolamine (PEA) in the urine were detected in clinical laboratory tests.
2. No abnormal findings related to general growth were observed.
3. Intraoral clinical findings showed non-inflammatory mobility and exfoliation of the teeth.
4. X-ray findings showed resorption of the alveolar bone, whereas no resorption of the root apex was noted.
5. Partial defects of cementum were observed in the extracted teeth based on SEM.
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Ibuki Sato, Takehiko Shimizu, Eirou Oikawa, Jirou Oikawa, Kazuhisa Oka ...
2000 Volume 38 Issue 3 Pages
657-665
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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This syndrome was originally described in 1933 by Cornelia de Lange and till now, several case have been reported. This case report shows a 4-year,8-month-old female who experienced dental treatment and feeding training.
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Yuko Kuniyosi, Junko Ohasi, Masashi Sato, Noboru Yamashita, Mitsuko In ...
2000 Volume 38 Issue 3 Pages
666-673
Published: June 25, 2000
Released on J-STAGE: January 18, 2013
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It has been reported that dentinogenesis imperfecta is a disease of the dentin formation based on an inherited disorder, generally, followed by osteogenesis imperfecta.
We had an opportunity for dental clinical examination of two siblings, an elder sister and a younger brother, who had deciduous teeth with dentinogenesis imperfecta, Although we felt that the two siblings might not show three characteristic disorders in osteogenesis imperfecta. In this study, we reported the results by clinical and X-ray examinations and also by histological and physicochemical investigations on their exfoliated teeth.
Clinically, all of the erupted deciduous teeth of the two siblings gray-bluish in color, showed a remarkable attrition and had partially chipped enamel. X-ray photography revealed that the dental pulp cavities of all the deciduous teeth in the two siblings had been constricted. Moreover, X-ray lucent areas were seen in the roots of all the four teeth of the first deciduous molars and the lower-right second deciduous molar in the younger brother.
Histologically, the exfoliated deciduous teeth of the two siblings showed a flat structure at the dentin-enamel junction. In some of the teeth, the mantal dentin attached with the enamel showed hypocalcification. Tomes' granular layer-like structures associated with short dentinal tubules were observed in the dentin. The dentinal tubules in most areas of the circumpulpal dentin were, however, extremely loose in density and the dental pulp cavities were remarkably constricted as reported previously. Statistically, the dentin showed a lower calcification than the normal dentin with energydispersive X-ray microanalysis. In addition, the dentin of younger brother showed a significantly softer than normal dentin under the Vickers' microhardness test. We thus consider that these basic findings suppout the clinical and X-ray photographic observations.
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2000 Volume 38 Issue 3 Pages
675-722
Published: June 25, 2000
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2000 Volume 38 Issue 3 Pages
724-725
Published: June 25, 2000
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2000 Volume 38 Issue 3 Pages
726-727
Published: June 25, 2000
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