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Volume 43 (2005)
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Volume 43, Issue 1
Displaying 1-17 of 17 articles from this issue
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Toshinari Mikami2005 Volume 43 Issue 1 Pages 1-11
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSChewing xylitol gum is thought to be an effective method of caries prevention for children who run a high risk of caries or who cannot brush their teeth very well. To prevent the demineralization of tooth enamel and to promote remineralization with chewing gum containing fluoride, the amount of fluoride which can safely be added to the chewing gum is important. In this study the positive effects on the remineralization of human enamel using remineralizing solution containing 10% xylitol and low various concentrations of fluoride were examined using the CMR method and furthermore the positive effect on remineralization of trial xylitol chewing gum containing fluoride was compared with two commercially available xylitol chewing gums containing remineralizing promoting materials in vitro and in vivo. As a result, it was found that the degree of remineralization with remineralizing solution containing 10% xylitol and less than 0.4 ppm concentraion of fluoride did not show a significant increase compared with the control (0 ppm F), but the degree of remineralization with no less than 0.8 ppm concentraion of fluoride showed a highly significant increase compared with the control and the change in the tendency was obvious. These results suggested that xylitol restrains remineralization when the concentration of fluoride is low. The remineralizing effect of trial xylitol chewing gum containing fluoride(2μg/stick)was between that of two commercially available xylitol chewing gums in vitro, and was almost the same as the lower one in vivo.View full abstractDownload PDF (5385K) -
Xie Xue-Jun, Kumiko Nozaka, Akiko Namioka, Feng Xin-Yan, Yuriko Suruga ...2005 Volume 43 Issue 1 Pages 12-27
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSUsing the plaster models of the primary dentition of Japanese and Chinese infants, we quantifed the dental complex, and compared it between them. The following results were obtained.
1. As regards the upper first deciduous molar, the area of the buccal cusps and the buccolingual diameter were larger in Chinese males than in Japanese males. In contrast, the lingual cusps of Chinese females were smaller than that of Japanese females, but no differences were found in the buccolingual diameter between them. Chinese males and females showed not only a smaller anatomical occlusal surface but also a significantly smaller ratio of the anatomical occlusal surface to the contour of the crown. In addition, Chinese females had a smaller intercuspal distance.
2. Regarding the upper second deciduous molar, the anatomical occlusal surface, the distance between mesial cusps, and the ratio of the anatomical occlusal surface to the contour of the crown were significantly smaller in Chinese males than in Japanese males. Most of the measured parameters were smaller in Chinese females than in Japanese females, suggesting strong miniaturization of the crown in Chinese females.
3. As for the lower first deciduous molar, not only the difference in the intercuspal distance between the mesial and distal cusps but also the portion of the area occupied by the mesiolingual cusp in the crown were smaller in the Chinese subjects than in the Japanese subjects, suggesting a mesial shift of the lingual groove and an increase in the occlusal groove.
4. In the lower second deciduous molar, the cusps located distally were significantly smaller in both Chinese males and females. The distal cusps in particular showed also a smaller ratio in size to the protocone in the Chinese subjects. From these results, we assumed that the degenerative tendency of the dental complex of deciduous molar teeth would be stronger in Chinese subjects, especially in females, than in Japanese subjects.View full abstractDownload PDF (4491K) -
On the Comparison between the Department of Pediatric Dentistry, Our University and the Department of Pediatric Dentistry, at a University in ChinaMie Sonomoto, Shinnya Shirasu, Harumi Ishikawa, Mikio Kato, Michiharu ...2005 Volume 43 Issue 1 Pages 28-34
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSTo discover a difference in the traumatic dental injuries of children in China and Japan, we investigated injured patients who visited the Department of Pediatric Dentistry, Osaka Dental University (ODU) involving 43 patients and 89 teeth and the Department of Pediatric Dentistry, the Stomatological College of the Fourth Military Medical University at Xian, China (FMMU), involving 68 patients and 101 teeth. The study was conducted from November,2003 to August,2004.
1) As for age distribution, the peak ages were 1-2 years of age and 8-9 years of age for both. There were numerous patients in the 1-2 year old, lower age group at ODU, while there were numerous patients in 8-10 year old group at FMMU. The sex ratio was 1.87: 1 at ODU, and 1.92: 1 at FMMU, with the boys being in the majority.
2) The traumatic dental injury occurred at indoors for patients at ODU and at outdoors for patients at FMMU.
3) The most common cause of trauma for the patients on the both countries was falling.
4) There was most Sunday and there were few Monday and carrier wound days of the week in the ODU on Saturday. Tuesday of the FMMU was the most and there were little Monday and it on Wednesday.
5) At the both hospitals the ratio of patients who went for examination within one week of the injury exceeded 70%.
6) The anterior teeth in maxilla were most frequently affected by trauma in both the primary teeth and permanent dentitions.
7) At both hospitals, the most common classification of trauma was Class C 3 for the primary dentition but at FMMU Class A 2 was seen in comparatively more cases. For the permanent dentition, at ODU Class 5 was the most common while at FMMU Class 1 was the most common.View full abstractDownload PDF (1438K) -
Katsumi Miyoshi, Kagumi Uesu, Matsunaga Rie, Moroboshi Hiroyo, Maeda T ...2005 Volume 43 Issue 1 Pages 35-40
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIt is useful for the prediction and the evaluation of the healing process of TMD in the lower age period to study the characteristic of the jaw movement of a child patient with abnormal jaw movement. When you analyze jaw movement using a three-dimensional jaw movement analysis device, the arbitrary hinge axis points of both the right and left sides are ordinarily used. The authors believe that the movement of the arbitrary hinge axis point during jaw movement is not the same as that of the condylar point obtained by tracking. However, the relationship of the position of those points is not clear. The position of the condylar point by tracking is shown as the shortest distance of the condylar point during the jaw movement path from the mouth closing position to the maximum opening position, and the point is named the center point during jaw movement. The distance of the center point and arbitrary hinge axis point during jaw movement were measured. The results were obtained as follows. It was clarified that the center point during jaw movement of hemilateral reduction and hemilateral irreducible jaw movement was away from the arbitrary hinge axis points in children with bilateral joint disk displacement of TMD. Moreover, a minute condylar movement was confirmed by the center point during jaw movement. The center of the jaw movement that is impossible to describe by arbitrary hinge axis points using conventional analysis of jaw movement seemed to be based on the condylar point during the jaw movement examined in this study.View full abstractDownload PDF (1740K) -
Kanako Fukuyama, Tetsuro Ogata, Akane Mizukami, Reiko Tateno, Satoshi ...2005 Volume 43 Issue 1 Pages 41-46
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSPreventive dentistry is particularly important for disabled children. Tooth brushing at home is therefore, essential. However, most of disabled children tend not to be cooperative with respect to tooth brushing at home. Brushing in home would be thereby a great burden on their parents. We have carried out a project of oral health care consisting of oral examination, instruction in tooth brushing, and individual consultation at day care facilities for disabled children twice a year for 17 years. There are two keynotes in this project, that is forming a habit of tooth brushing at home and having a family dentist. To investigate the effect of our oral health care instruction, we made a follow-up survey by sending out a questionnaire through the mail to 144 guardians who had been given oral health care instructions when they went to the day care facility and whose children were within 3 years after leaving the facility. The contents of questionnaire included whether the children brushed teeth every day and the degree of cooperation during tooth brushing, and whether they had a family dentist or not. As the results, the ratio of children who brushed their teeth every day after leaving the facility was 86%, which was almost the same ratio as that during the period of time the facility was visited. In addition, the degree of cooperation during brushing tended to improve after leaving the facility. The ratio of those who had a family dentist after leaving the facility was 81 %, which increased from 57% before leaving the facility. It was therefore concluded that our oral health care instruction from early childhood was effective to some extent. We would like to examine the project refer to the results of this study. Based on the present results, it was found that the habit of tooth brushing was firmly established at the time of leaving the facility, and that the number of people having a family dentist had increased, the significance of oral health instruction.View full abstractDownload PDF (923K) -
Akiko Ryokawa, Makoto Saito, Takeyoshi Asakawa, Hiroki Matsumoto, Rina ...2005 Volume 43 Issue 1 Pages 47-52
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSFor the purpose of investigating the effect of the nitrous oxide inhalation on the cooperation of child patients during dental treatment and on that during the next visit, cooperation was monitored based on the external behavior during dental treatment and during the next visit. The awareness of the child patients and their guardians to this method was examined using a questionnaire.
The effect of nitrous oxide inhalation sedation with respect to improvement of the external behavior had a tendency to increase in accordance with the increase of the age of the patient. It could be applied successfully to even lower age patients. Also, the attitude of the patients who had undergone dental treatment successfully under nitrous oxide inhalation sedation improved during the next appointment.
According to the questionnaire given to the guardians, the desire to have treatment under this method again was a little weaker in comparison with the percentage of favorable response to this method. This reflects the fact that the guardians do not have enough information about the nitrous oxide inhalation sedation and are ill at ease with respect to this method.
As the ordinary people do not have enough information of this method and its safe and comfortable effect is not a common understanding, dentists must explain about the method sufficiently and obtain the informed consent. In addition to this, efforts should be made to improve the recognition of this method among the people.View full abstractDownload PDF (1031K) -
Yoshiaki Ono, Akira Suzuki, Maki Minami, Masachika Sujino, Seika Haku, ...2005 Volume 43 Issue 1 Pages 53-57
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSResin-modified glass ionomer sealant (RMGI) (Fuji III LC®w) as applied under simple exclusion of moisture in 54 children who had been under regular dental care since the primary dentition stage (A group) and 46 children who started since the mixied dentition stage (B group), and the clinical results were investigated. As for the results, the clinical examination showed the cariostatic rate of 98.1% in A group and 98.3% in B group which were under care for 4.6 years and for 5.5 years after application of RMGI, respectively. In order to maintain the high caries-preventive rates, this results indicated the need for both additional application to unerupted fissures and another preventive procedures at the regularly dental check up. In the case of fissure sealant by this material, it was shown that there was no problem, even if it is done under simple exclusion of moisture.View full abstractDownload PDF (753K) -
Kyouko Mizuno, Hiroya Gotouda, Chieko Taguchi, Seigo Kobayasi, Tomomi ...2005 Volume 43 Issue 1 Pages 58-64
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe usefulness of a rapid-immunoassay kit for S. mutans (Tokuyama Dental company-made kit, the TD kit), which was constructed by using an anti-S. nuttans polyclonal antibody, was examined using brushing-plaque samples from university students and school children.
The evaluation levels by the TD kit using the plaque samples from 84 university students and 20school children correlated significantly with S. mutans counts determined by the spiral cultivation method. The spearman's correlation coefficient of the two plaque samples were 0.86(p<0.001)and 0.89(p<0.001), respectively. In addition, sensitivitys, p ecificitya, g reament and kappa value of the TD kit were 0.98,0.95,92%, and 0.90, respectively. Based on these results, it was confirmed that the brushing-plaque the TD kit system is superior to the stimulated-saliva the TD kit system, and suggested that this measuring system would be a useful tool for diagnosing the risk of caries.View full abstractDownload PDF (1037K) -
Akiko Tsubokura, Kaori Kaneko, Keiichiro Tsujino, Kiyoshi Mochizuki, Y ...2005 Volume 43 Issue 1 Pages 65-71
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe objective of this investigation was actual conditions of dental traumatic injury and treatment at the Pediatric Dental Clinic of the Tokyo Dental College Suidobashi hospital from 2000 to 2003.
A clinical statistical study was made of 286 traumatized teeth and 34 soft tissue injuries patients.
The results were as follows:
1) The ratio of the boys and girls was 3: 2 for the primary teeth, and was 2.5: 1 for the permanent teeth, respectively.
2) Maxillary central incisors were most frequently affected both in the primary and permanent dentition.
3) The main causes for trauma were falling and collision.
4) Most of the children with trauma involving the permanent teeth visited our hospital within 24hours of the injury but very few visited with regard to the primary teeth.
5) The types of trauma in the primary teeth were in the order of movements and displacement. The types of trauma in the permanent teeth were in the order of crown fracture, displacement.
6) Observation and irrigation, were the most common type of treatment.
7) The common site of soft tissue injuries was gingival and the most common treatment for the soft tissue was irrigation.View full abstractDownload PDF (1081K) -
Juan Han, Takehiko Shimizu, Kunihiko Shimizu, Rie Matsunaga, Takahide ...2005 Volume 43 Issue 1 Pages 72-78
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSCleft lip with palate (CLP) is a common human birth defect with a complex unknown genetic cause. The "A" mouse has been used as an animal model for understanding the molecular pathogenesis of CLP. Our previous study performed genetic crosses using the A/WySn and C 3 H/He strains of mice. It was suggested that CLP due to cortisone exposure was recessively influenced by autosomal genetic factors. The purpose of the present study was to identify the candidate chromosome causing CLP in the A/WySn mice. We examined the individual genotype of 37 N2 backcross embryos with CLP using 82 polymorphic markers that were distributed throughout the autosomal chromosome. The genotypes of all 37 N2 backcross embryos with CLP were A (A, A/WySn) homozygous at D 11 Mit 10 [genotype ratio of A homozygous: A/C 3 H (C 3 H, C 3 H/He) heterozygous was 37: 0, X2>33.11, p< 0.00001], a highly significant linkage was obtained for chromosome 11. High linkage was also obtained at D 14 Mit 34 for chromosome 14 (genotype ratio of A homozygous: A/C 3 H heterozygous was 29: 8, X2=11.92, p< 0.001). These results suggest that the genetic candidate for CLP by cortisone exposure may involve on chromosome 11 and chromosome 14 in the A/WySn mice.View full abstractDownload PDF (1121K) -
Mifune Kudo, Shoji Takahashi, Nobutaka Isokawa, Tomoko Sato, Naoto Yan ...2005 Volume 43 Issue 1 Pages 79-84
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSChildren with open bite with tongue thrust swallowing have anterior open bite or notable labial inclination of the incisor tooth in the maxilla and mandible. It was expected that children with open bite with tongue thrust swallowing would articulate the alveolar /s/ or /t/ as an interdental, however, there were a few studies using the Acoustic Analysis.
The purpose of this study was to cla rify the acoustical characteristic of the sounds /s/ in open bite patients. The formant frequency of the alveolar was extracted from the speech waveform in patients with open bite and compared to that of patients with normal bite.
We recorded the pronunciation of the short sentence ("ha na ga saita") that was articulated in patients with normal bite and patients with open bite from 3 years of age to 15 years of age. These sounds included the voiceless alveolar fricative /s/. The first and second formant for the voiceless alveolar fricative /s/ was analyzed. The frequencies of the first and second formant in patients with open bite were significantly higher than those in patients with normal bite. Putting the results of patients with normal bite and patients with open bite together, it was found as the alveolar became an interdental, the fricative became an approximant.
This result suggested that in patie nts with open bite the distance between the blade of the tongue and alveolar ridge is farther than in patients with normal bite, and the sound /s/ was not articulated as a fricative but as an approximants. The blade of the tongue came near the open end of vocal tract, and the sound /s/ became an interdental from the alveolar.View full abstractDownload PDF (1542K) -
Masami Takahashi, Mitsuko Nakayama, Masanobu Matsuno, Yuriko Igarashi, ...2005 Volume 43 Issue 1 Pages 85-93
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIn recent years, a number of studies have been atte mpted to explain the increase in tooth size within a considerably short period time. In Japan, although it had been previously reported that the lower first molar erupted at an earlier stage than the lower central incisor, the recent average eruption age of the lower central incisor tends to be earlier than that of the lower first molar. The purpose of the present study was to analyze the difference in tooth size and eruption pattern of permanent teeth between present and past generations in Japan. In order to do so, we compared the plaster models of permanent dentition obtained from 90 children who commuted to Kogasaki Elementary School in Chiba between 1997 and 2002 and those of 135 children who commuted to Asahi Elementary School in Shizuoka between 1975 and 1981.
At Kogasaki Elementary Sch ool, mesiodistal crown diameters of all of the permanent teeth measured were larger than those at Asahi. Furthermore, the eruption times of all of the permanent teeth observed were later in Kogasaki boys and girls than those of the boys and girls in Asahi. These Changes in tooth size seem to be related to the high level of nutrition, particularly, fats from the 1970s to 1990s. The late tooth eruption in Kogasaki seems to be due to enlargement of the tooth size. The lower first molar was the first tooth to erupt in Asahi, while the lower central incisor was the first to erupt in Kogasaki.View full abstractDownload PDF (1230K) -
Hiroshi Sekiguchi, Tatsuro Fukuyama, Tomoko Harada, Hiromi Miyasato, A ...2005 Volume 43 Issue 1 Pages 94-98
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe continuing trend toward the nuclear family, the increasing number of working mothers and the introduction of the five-day school week have produced major changes in the lives of children. As a consequence, changes are also occurring in the time requested for visits of children to a pedodontist. This paper is a study concerning the hours and days of the week that parents and children prefer for pediatric dental appointments. It found that at any grade level Saturday appointments are preferred over weekday appointments. Parents, it seems, do not want to take their children out of school and preschool or interrupt their after-school classes. Further, with the introduction of the five-day school week, Saturdays have become holidays and are greatly preferred by parents and children who are concerned about disruptions to academic performance.
Subsequent study is necessary to understand the considerations of parents and children when they decide which time and day of the week they prefer for appointments. It also appears necessary to consider a revision of Saturday consultation hours.View full abstractDownload PDF (608K) -
Mami Ikuta, Katsuya Moriyasu, Sachiyo Takamizawa, Yutaka Takamizawa, K ...2005 Volume 43 Issue 1 Pages 99-106
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSAnterior open bite in childhood is frequently caused by oral habits, but occasionally by a tumor of the tongue and macroglossia. This paper reports on a rare case of open bite caused by hemangioma of the tongue.
A five-year-old Japanese boy was referred to the Pediatric Dentistry of Tsurumi University with anterior open bite. The patient had a swelling of the cheek, a mass in the tongue and a lower enlarged lip as well as anterior open bite. In his study cast, the over bite and over jet were -6.50 mm and 1.20 mm respectively. The dental arch length and width were longer than the standards in both arches. The MRI and histopathological examination revealed multiple hemangiomas in the tongue, in the surrounding masseter and medial pterygoid muscles and parotid gland. The lesion of the tongue affected over half of the left side.
Steroid therapy was commenced to correct the anterior open bite and the salivation in conjunction with oral surgery starting at the age of 5 years 7 months. The surgical dissecting of the tongue and lower lip with an electric knife under general anesthesia was rendered at the age of 5 years 9 months. Oral treatment involving plaque control and oral health promotion was performed in our pediatric dental clinic. The open bite was corrected, as the hemangioma of tongue was reduced. At the age of 6years 6 months, his over bite and over jet was -2.60 mm and 2.40 mm respectively.
In this case, we achieved a success by team approach with dental pediatricians and oral surgeons.View full abstractDownload PDF (5358K) -
Kensuke Matsune, Reiko Ujigawa, Katsumi Miyoshi, Rie Matsunaga, Kunihi ...2005 Volume 43 Issue 1 Pages 107-112
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSAmelogenesis imperfecta is a disease that shows up as a defect in tooth structure caused by abnormal enamel development during tooth embryogenesis. The authors experienced a patient who was diagnosed as having amelogenesis imperfecta in this supernumerary teeth based on the results of clinical examination. We then examined the supernumerary teeth of this patient, through clinical examination, radiograph examination and histological examination using a scanning electron microscopy.
The results were as follows:
1. Our patient suffered from of amelogenesis imperfecta and the symptom was seen idiopathically.
2. It was a rare case in that our patient with amelogenesis imperfecta had supernumerary teeth.
3. The color of the enamel of the supernumerary teeth was different from the color of the other teeth of the primary and permanent dentition in this patient.
4. Using a scanning electron microscopy was the surface of the enamel of the supernumerary teeth shown to be rough and uneven compared with the supernumerary teeth in normal patients.View full abstractDownload PDF (3382K) -
Class I Open-bite of Mixed Dentition Treated with Maxillary Removable Expansion Plate: A Case ReportKishio Sabashi, Suguru Kondou, Mami Ishihara, Mie Imaizumi, Shigeki Ma ...2005 Volume 43 Issue 1 Pages 113-121
Published: March 25, 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSClass I open bite during mixed dentition has been treated by means of improvement of oral function in many cases. However, Class I open bite has abnormalities in the dental arch forms. Therefore, We tried to treat Class I open bite during mixed dentition using the Maxillary removable expansion plate. Analysis was made by face and intra-oral photograms, mounting casts, cephalograms and The EMG of the jaw closing muscles with The mandibular in the rest position during pre-treatment (6years and 8 months) of age, post-treatment (8 years and 6 months) of age and progress observation (10 years and 6 months) of age. The results were as follows:
1. The Upper and Lower dental arch lengths decreased slightly. The Upper and Lower molar width expanded, and the anterior incisors were aliened.
2. The vertical balance of the facial profile was shortened at the upper lip. and the upper lip retreated and the lower lip protruted.
3. The mandibular position moved to the lower-posterior position from the pre-treatment to the posttreatment observations, and did not move from the post-treatment to the progress observations. The EMG activities of the masseter muscle at the mandibular rest position decreased from the pretreatment to the post-treatment observations, whereas they decreased from the post-treatment to the progress observations slightly. The EMG activities of the temporal muscle in the mandibular rest position decreased from the pre-treatment to the progress observations.View full abstractDownload PDF (4997K) -
2005 Volume 43 Issue 1 Pages 122-173
Published: 2005
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSDownload PDF (13469K)
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