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Toyoji Hieda
1989 Volume 27 Issue 4 Pages
821-830
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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For modern medical care, social background may be an essential factor, and medical care through out the indivisual's life time appears to have significant meaning.
From this point of view, total dental care throughout childhood is being carried out in the field of pediatric dentistry.
It can be stated that we pedodontists have a degree of farsight in the treatment of traumatic injuries to the teeth regarding children (the theme of the lecture), since the injured teeth are treated not only as items to be restored but also as a part of the growing body with careful consideration on the effects with regard to orlo-facial growth.
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-The Effect of Viscosity of the Sealants and Type of the Applicators on the Administration Time and the Sealed Area-
Kazuhiko Yao, Osamu Kohara, Yutaka Shimoda, Humiko Konishi, Toyoji Hie ...
1989 Volume 27 Issue 4 Pages
831-840
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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From the standpoint of the durability of the sealants, it is assumed that the sealants should be applied only to the bottom part of the pit and fissure to avoid marginal fracture and wear of the materials.
Because of this, a minimum area for the sealant to be applied is required for a stable prevention of dental caries.
The purpose of this study was to investigate the effect of viscosity of the sealants and various applicators in the techniques for minimum-area-sealing.
Three sealants with various degrees of viscosity were applied to the stone models of a lower first molar by means of four types of applicators.
Three operators conducting the experiment were a dentist with two years of experience, a dentist with one year of experience and a student.
The time required for administration and the area of sealed pits and fissures were evaluated.
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Naotake Shibui, Motoko Suda, Katsumasa Suzuki, Rikiya Ishikawa, Kazuo ...
1989 Volume 27 Issue 4 Pages
841-853
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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here are various restrictions on the root canal filling of deciduous roots after root canal treatment unlike in the case of permanent teeth, because deciduous molars undergo physiological root resorption with aging. Among the restrictions, it is most important that the root canal filling material be similarly absorbed and disappear along with the deciduous root so that it does not prevent the eruption of the permanent successors. Hardly any of the root canal filling materials currently on the market, however, are suitable for deciduous molars because some of them disappear earlier than the deciduous root without becoming indurated in the root canal, while some delay tooth replacement because they are resorbed with great difficulty, and continue strongly to stimulate the surrounding tissue of the root apex. Root canal filling materials utilizing α-TCP and hydroxyapatite with excellent biocompatibility have recently been put on the market by Sankin Kygyo Co. Type-III, in particular, contains only 5% iodoform, causing only very slight stimulation, and is a relatively good product from a practical standpoint, i. e., filling the root canal using a lentulo.
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Yoshikiyo Ito, Masayuki Kaga, Haruhisa Oguchi
1989 Volume 27 Issue 4 Pages
854-863
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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This study was undertaken to compare the relative cytotoxicity of light cured composite resins, and the cytotoxic reduction of light cured composite resins by illumination time by means of in vitro cell culture test.
Light cured composite resins (P-30, Silux, Occlusin, Graft LC, Litefil A, Photo Clearfil A, Palfique light and Herculite XR) were filled into glass tubes (4mm inner dia.×1mm high), then illuminated for 0,10,20,30,40,50 and 60seconds through a matrix strip with direct contact ot an Optilux light source (3M), just before testing.
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Masamichi Ide, Emi Matsumoto, Ikuo Ohmori
1989 Volume 27 Issue 4 Pages
864-875
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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Two primary teeth with enamel hypoplasia from two cerebralpalsied children were subjected to histological examination. One primary tooth was B and the other was C. The location of enamel hypoplasia in these teeth was considered to coincide with the neonatal line reaching the enamel surface.
The purpose of this study was to examine the location of the enamel hypoplasia in these teeth in relation to the neonatal line, and to detail the histological structure of the teeth. They were examined morphologically as well as histologically, by using a stereoscopic microscope, SEM, a light microscope and a microradiogram.
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Masaaki Ishikawa, Masayo Kawasumi, Toshiyuki Noma
1989 Volume 27 Issue 4 Pages
876-883
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The purpose of this study was to investigate the morphological variation of teeth of the partial anadontia with anhydrotic and hypohydrotic ectodermal dysplasia. Qualitative and quantitative observations were made for the upper central incisor and upper first molar in the anadontia of 18 patients. Moreover, some phylogenetic consideration was taken on the variability of the shapes.
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Toru Takarada, Guadalupe Alvarado Larrinaga, Fumihiko Nishida, Mizuho ...
1989 Volume 27 Issue 4 Pages
884-894
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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For the investigation of the functional change of the masticatory muscles along with growth and development, the frequency analysis of the EMG power spectrum was carried out. The subjects were 6 children (5 males and 1 female) with full deciduous dentition(Hellman's dental age IIA)aged 4.5±0.2 years and 6 adults(4 males and 2females)with full permanent dentition aged 27.7±3.8 years. EMG signals were recorded bilaterally by means of bipolar silver surface electrodes from the anterior temporal and masseter muscles when the subjects were chewing chewing gum or performing maximum clenches in the intercuspal position. A fast Fourier transform (FFT) algorithm was used to obtain the power spectrum of the EMG signal. As the total power value from 62.5 to 1000 Hz was 100 per cent, the mean frequencies at 25,50,75 and 90 per cent of the cumulative power were calculated.
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Guadalupe Alvarado Larrinaga, Toru Takarada, Fumihiko Nishida, Mizuho ...
1989 Volume 27 Issue 4 Pages
895-906
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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For the investigation of the functional change of the masticatory muscles along with growth and development, electromyographic evaluation was carried out.
The subjects were 6 children (5 males and 1 female) with full deciduous dentition(Hellman's dental age IIA)aged 4.5±O.2 years and 6 adults(4 males and 2 females)with full permanent dentition aged 27.7±3.8 years. EMG signals were recorded bilaterally by means of bipolar silver surface electrodes from the anterior temporal and masseter muscles when the subjects were chewing chewing gum or performing maximum clenches in intercuspal position.
The cumulative power values from 62.5 to 1000 Hz in the EMG power spectrum during chewing or clenching were calculated as the muscle action potential. The ratio of the action potential of each muscle to the total action potential of four muscles were analyzed. Masticatory rhythm during chewing was analyzed by means of the time parameter (duration, interval and cycle) and their coefficients of variation.
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I: Metal Requirement
Katsura Arai, Kie Aoki, Mari Miura, Haruhisa Oguchi
1989 Volume 27 Issue 4 Pages
907-914
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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Many of micro-organisms under aerobic conditions showed oxygen tolerance caused by the induction of several oxygen-derived free radical scavengers. In the present study, we tried to clarify the changes of active oxygen metabolism of streptococcus mutans (sobrinus) B13 under aerobic conditions.
Aerobic and anaerobic culture of streptococcus mutans (sobrinus) B13 was made in normal, metal chleted, and metal supplemented medium. Superoxide dismutase (SOD) activity and bacterial proliferation were determined on the cultured cells. We obtained the following results.
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-The View of Early Stages?
Hiroshi Nobuke, Yujiro Miyake, Shigeru Kidokoro, Nobuo Nagasaka
1989 Volume 27 Issue 4 Pages
915-921
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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Eugenol has such effective anti-corrosion and pain-killing properties that it is widely used for dentistry clinically. We focused our attention on eugenol and made agents for pulpotomy which were mixtures of calcium hydroxide, eugenol and polyethylene glycol 4000 for a base. We attempted to use them for the pulpotomy of primary teeth of young dogs and observed the healing progress of the treated teeth during the early stages.
The experiment utilized four young dogs whose primary teeth were pulpotomized by the usual method. Agents of the pulpotomy were mixed calcium hydroxide (1.0 g), eugenol (0.8 ml) and polyethylene glycol 4000 (1.2 ml). After 3 days and 7 days, these teeth were taken out to be made into histopathological specimens. We inspected them microscopically.
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-In fluence of the Ground Depths of the Enamel and Etching Times (I)-
Yumiko Hosoya, Noriko Nakamura, Hiromi Shinagawa, George Goto
1989 Volume 27 Issue 4 Pages
922-935
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The purpose of this study was to investigate the influence of the ground depths of the enamel and etching times on the adhesion of the resin on the ground enamel.
Seventy-five extracted and frozen bovine mandibuler young permanent incisors were used. The etchant used in this study was 40% phospholic acid gel and the etching times were 0,10,20,30 and 60 seconds. All of the specimens were washed with an air water spray for 30 seconds after etching. The bonding agent and composite resin used in this study were Photo Bond and Photo Clearfil A (Kuraray Co. ). Shear bond strengths to the outer enamel layers and inner enamel layers of the same teeth were measured. After the shear bond strength test, all the test surfaces of the enamel and resin specimens were observed using the SEM.
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Osamu Fukuta, Noriko Ohishi, Yoshiko Suzuki, Hiromi Maruyama, Hiroshi ...
1989 Volume 27 Issue 4 Pages
936-944
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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Behavior-therapeutic training was applied to patients who were not cooperative in dental surroundings and could not be managed for dental treatment. The training was continued from the first to the final visit and also at periodical checkups. The clinical effects of training were evaluated. The subjects were 150 handicapped child patients who visited the pedodontic clinic of Aichi-Gakuin University. The patients were classified into two groups according to the degree of cooperation regarding dental treatment during the first visit; 1) the slightly uncooperative group and 2) the uncooperative group.
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Kenji Kikuchi, Mayumi Miki, Sachiko Miyamoto, Kenji Arita, Mizuho Nish ...
1989 Volume 27 Issue 4 Pages
945-951
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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In a previous article we reported that mastication played an important role in the development of submandibular glands in male mice. Submandibular glands contain epidermal growth factor (EGF) which stimulates the proliferation of various cells in developing animals.
In this study, the effects of the hypotrophy of submandibular glands caused by reduction of mastication and the removal of the glands on the growth ability of isoproterenol (IPR)-stimulated parotid glands and other tissues were investigated.
The animals in the experiment were male mice and they divided into three groups, a control group fed a solid diet, a group fed a paste diet and a group with removed submandibular glands fed a solid diet.
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-Research of Various Factors Affecting the Frequency of Training by Multivariate analysis-
Sachiko Kobayashi, Midori Takagi, Shohachi Shimooka
1989 Volume 27 Issue 4 Pages
952-972
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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A Search was made using quantification methods of the first and second type to discover the factors affecting the frequency of training, and to estimate it.
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Syousaburo Toyoshima, Takanobu Morinushi, Hisaki Shimizu, Takeshi Oku, ...
1989 Volume 27 Issue 4 Pages
973-984
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The factors which determine the situation of continuation in malocclusion treatment and characteristic of patient with malocclusion in pediatric dentistry were estimated from the status and the trend of patients undergoing denture guidance at the outpatient clinic for pediatric dentistry. The following results were obtained.
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Takanobu Morinushi, Mayumi Fukushima, Shoko Doti, Hiroko Kitami
1989 Volume 27 Issue 4 Pages
985-992
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The aim of this study was to confirm the effectiveness of a screening test on the cooperation of Autistic children in the dental clinic which was proposed by a former report. The subjects were composed of 55 autistic children making their first visit and other patients. The following results was obtained from this study.
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Part 1: Relationship between the Mothers' Behavior and the Image to Dental Environment and Self-consciousness
Yoshiko Suzuki, Noriko Ohishi, Hiroshi Yanase, Yukari Yamada, Osamu Fu ...
1989 Volume 27 Issue 4 Pages
993-1001
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The purpose of this study was to find out factors by which mothers of handicapped children chose whether to be with their children while receiving dental treatment or not. The questionnaires from mothers of 42 handicapped children were examined.
Factors on the part of the mothers such as their views on the dental environment, their egogram, and the reasons of the mothers' behavior were surveyed.
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Part 1 Biting Pressure and Masticatory Efficiency for 3, 4 and 5 Years Old Children
Takahide Maeda, Urara Imai, Takeshi Saito, Naoto Higuchi, Morito Akasa ...
1989 Volume 27 Issue 4 Pages
1002-1009
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The purpose of this study was to investigate the biting pressure and masticatory efficiency of 3,4 and 5 year old children.
Some of them had trouble regarding their feeding behavior, either saying that they were not able to bite hard food or that they didn't want to bite hard food.
A new method using A. T. P. (Adenosine Triphosphate) granules introduced with rubber finger protectors was used for measurement of the masticatory efficiency.
69 healthy 3,4 and 5 year old children who had normal occlusion and were caries free were the subject.
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Takahiro Minami, Tadahiro Miki, Taku Fujiwara, Shigetada Kawabata, Aki ...
1989 Volume 27 Issue 4 Pages
1010-1017
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The caries-inducing activity of Isomaltooligosugar (IMOS: a isomaltose rich sugar mixture) was examined in in vitro and in vivo experiments. Strains of Streptococcus mutans MT8148R and Streptococcus sobrinus 6715 fermented IMOS and produced acids. IMOS inhibited the glucan synthesis from sucrose by glucosyltransferases from both of S. mutans and S. sobrinus. Furthermore, IMOS inhibited sucrose-dependent adherence of those mutans streptococci. IMOS was found to induce significant but minimal caries SPF Sprague-Dawley rats infected with either MT8148R and 6715. However, IMOS did not inhibit the caries which was induced by sucrose.
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Akira Izumitani, Taku Fujiwara, Takahiro Minami, Seiji Suzuki, Takashi ...
1989 Volume 27 Issue 4 Pages
1018-1024
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The caries inducing activity of maltitol was examined in in vitro and animal experiments.
Fifteen strains of oral streptococci were not able to ferment maltitol. Also, maltitol inhibited the glucan synthesis from sucrose by GTases from mutans streptococci. However, the inhibition of growing-cell adherence was not so marked with the addition of maltitol to sucrose culture.
In the animal experiments, maltitol did not induced dental caries in rats infected with mutans streptococci. Furthermore, maltitol significantly inhibited the sucrose-induced dental caries in rats infected with S. sobrinus 6715. However, there was no significant difference in rats infected with S. mutans MT8148R.
These results indicated that maltitol is useful as a non-cariogenic sucrose substitute.
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Kazuhiko Ogihara, Masami Uehara, Noriharu Itoh, Eiji Mizorogi, Katsuma ...
1989 Volume 27 Issue 4 Pages
1025-1034
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The purpose of this study was to evaluate the condylar changes induced by Bionator therapy.
The pre and post treatment Cephalometric, tomographic, and dental cast record were evaluated.
An 11-Year,8 month-old boy with malocclusion class II div.1 was referred to the Pedodontic clinic of the Nippon Dental University Hospital with a chief complaint of Brxism and Protrusion. The medical history was non-contributory. The period of the observation was 3 years 2 months.
Normal permanent occlusion was obtained after treatment. The cephalometric findings showed a favorable relationship between the results of the skeletal and dental changes.
Also the results showed an effect on the maxilla and mandible stimulation, class II skeletal correction.
Favorable changes in the mandibular condylar position using the Bionator were observed in tomographic records before and after treatment.
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Yoshihiro Tanabe, Yo Tauchi, Tadashi Noda, Akira Oguro, Kin-ichi Horii
1989 Volume 27 Issue 4 Pages
1035-1046
Published: December 25, 1989
Released on J-STAGE: January 18, 2013
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The purpose of this study was to learn about the prevalence of dental caries in mentally retarded individuals and to follow up the treatment of the caries.
The study group comprised 144 severely retarded individuals (79 males and 65 females) aged 6-19 at the time of their admission to the Institute. Following results were oftained by analyses of their dental examination over a period of records in 15 years from 1973 to 1987 and of their treatment charts over a period of 8 years from 1980 to 1987.
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