-
Miho Daito, Mikio Kato, Michiharu Daito
2002 Volume 40 Issue 1 Pages
1-9
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
This study aimed at grasping the influence which treatment during the primary dentition period exerts on the root resorption and shedding of the mandibular primary first molar, calcification and eruption stage of successional permanent teeth (mandibular permanent first premolar). To a certain the relationship of this, we reviewed clinical records, plaster models, orthopantomography, dental X-ray films of treated deciduous teeth of 4,5,6 year-old outpatients who had come to the Department of Pediatric Dentistry, Osaka Dental University. As a result we observed following conclusions.
1) The root resorption of the mandibular primary first molars made slower progress in the order of the root canal filled ones after infected root canal treatment, root canal filled ones after pulpectomy under local anesthesia, ones vital pulp amputation, restored ones with normal roots, and normal primary molars.
2) The shedding of the deciduous teeth was in the same order.
3) When it come to the calcification of successional permanent teeth, though calcification of the germs of successional permanent first premolars temporally increases, different effects between the cases of root canal filled deciduous teeth after infected root canal treatment and those of early exodontias were not found.
4) As far as the eruption time is concerned, early exodontias causes eruption of successional premolar earlier and late exodontias causes early eruption. The trends in the effect of other treatments were same as for root resorption deciduous roots.
View full abstract
-
the acid resistance and the hardness of enamel
Mika Isogai, Yu Matsumura, Kouji Arai, Haruo Nakagaki, Takahisa Toyama ...
2002 Volume 40 Issue 1 Pages
10-18
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
Although many investigations concerned with the influence of irradiation using the Er: YAG laser on the subsurface of enamel use high-energy irradiation, few studies use low-energy irradiation.
Therefore, we examined enamel subsurfaces irradiated with low-energy in order to use the Er: YAG laser in fissure sealants.
The energy level was set at 50 mJ/pulse. The longital sections were analyzed using a polarized light scope and scanning electron microscope (SEM), and furthermore the cross sections were analyzed for acid resistance and the hardness.
The following results were obtained;
1. The white-blue layer was observed in the subsurface of irradiated enamel using a polarized light scope, and using SEM the layer with the difference in contrast was found surrounding the defects in the irradiated enamel.
2. The acid resistance of the irradiated enamel significantly increased.
3. The hardness of the irradiated enamel decreased significantly in the-depths of 20μm,40μm and 60μm, except 80μm.
Considering the circumstances mentioned above, it was concluded that low-energy irradiation using the laser caused not only morphological changes, but also changes in the structural and physical properties in the enamel. Key words: Er: YAG laser, Enamel subsurface, Acid resistance, Hardness
View full abstract
-
Tetsuya Iida, Hideki Saka, Yoshinobu Ide
2002 Volume 40 Issue 1 Pages
19-31
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
The aim of this study was to elucidate the details of the root resorption of deciduous teeth, including morphological changes and the relationship between root resorption and the developmental state of permanent teeth.
The mandibles from dry skulls classified into five eruption stages of deciduous and mixed dentition were observed using Micro-CT, and the distances between the root surface and bony crypt were measured.
The bony crypts of the mandibular incisors at the lingual side of the preceding deciduous teeth grew toward the upper direction as the dental eruption stages progressed, and root resorption was evident at the deciduous dentition stage. Resorption proceeded to the root and root canal at the eruption of the first molar. It is suggested that there is a close relationship between the growth of the bony crypt of the central incisors and root resorption in the mesial surface of the latelal deciduous incisors. Distances became shorter between the root of deciduous incisors and the following bony crypt and between the root of the lateral deciduous incisors and the bony crypt of the central incisors with the advancing of the developing stages.
View full abstract
-
EMG Activities of Peri-oral Muscles and Tooth Eruption
Kazuo Hayashi, Yoshihiko Nakaoka, Kazuhiko Koyama, Yasuo Tamura
2002 Volume 40 Issue 1 Pages
32-45
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
The purpose of the present study was to investigate the development of the masticatory function in infants from sucking or weaning to adulthood with maturated chewing, by evaluating the changes in the EMG activities of the peri-oral muscles (TM: temporal, MM: masseter, OM: orbicular oris and SM: suprahyoid muscles). A total of ninety-one subjects were divided into the following seven groups, the sucking group (G 0: as a control, mean age 3.7 month), G 1 (early weaning stage,7.1months), G 2 (middle weaning stage,9.1 months), G 3 (late weaning stage,10.8 months), G 4 (completion of weaning,1.2 years), G 5 (3.8 years) and G 6 (adults,25.1 years). The transition of the EMG activities of the muscles while ingesting cooked rice as a test food were analyzed.
1) When the four muscles were grouped into three according to their function such as the TM and MM for the jaw closing muscles, the OM for the facial muscles, and the SM for the jaw opening and tongue moving muscles, characteristic changes in the EMG activities were found.
2) The muscle activities of the TM and MM increased from the initiation of weaning, whereas no change was found in the activity of the SM except for G 5.
3) The total muscle activity (TM+ MM+ SM: TMA) increased from G 0 to G 2 and once decreased in G 3, but after that it significantly increased again.
4) The ratio (%) of the TM to the TMA increased significantly in G 1 and it significantly increased after G 3 again, whereas the ratio of the SM significantly decreased in G 1 and increased in G 3, and then it decreased continuously to G 6.
5) The masticatory function developed from the G 1 to G 4, but there was no significant relationship between the tooth eruption and the EMG activities of the muscles in G 1 and G 4. However, EMG activities of the jaw closing muscles increased greatly in G 5 which exhibited completion of the primary teeth occlusion.
These findings suggest that there is a turning point in the masticatory function during weaning in infants of G 3 and this point is suggested to be the start of the matured type mastication pattern.
View full abstract
-
Reiko Hibino, Keiko Miyauchi, Yasuo Kuwabara, Shigehisa Kuwabara, Keik ...
2002 Volume 40 Issue 1 Pages
46-53
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
The purpose of the study was to investigate differences in the occlusal force, height, body weight and maximum mouth opening range between Japanese and Chinese children with different social environment and foods. Subjects participating in the study included 546 Japanese children from Gifu prefecture and 237 Chinese children from Shanghai city aged 7,9,11 and 12 years old. The results obtained were as follows
1. The occlusal force of Japanese boys were significantly stronger than that of Japanese girls in every age group and that of Chinese boys significantly stronger than that of Chinese girls in the 11 and 12year old group. The occlusal force of Chinese girls was significantly stronger than that of Japanese girls in every age group.
2. The physical development (height, body weight) of Chinese children was significantly higher in value than that of Japanese children in both genders.
3. The mouth opening range of Japanese boys was significantly wider than that of Japanese girls in the 11 and 12 year old group and that of Chinese girls was significantly wider than that of Chinese boys in the 7 year age group. Furthermore, that of Japanese boys was significantly wider than that of Chinese boys in the 7,11 and 12 year old group, and Japanese girls was significantly wider than Chinese girls in the 11 and 12 year old group.
4. Though the occlusal force showed a positive correlation with the age in the children or both countries, no significant correlation between the occlusal force and physical development (height, body weight) in each age group was found.
These findings suggest that the increase of occlusal force may be influenced by the circumstances in which the children have grown up.
View full abstract
-
Reiko Nomura
2002 Volume 40 Issue 1 Pages
54-63
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
Asada et al. reported that EL/Sea (EL) mice having 97% incidence rates of absence of all of the third molars and showing no significant difference between sexes were useful models for studying the cause of the absence of the third molars. Nakamura et al. performed the genetic crosses using two strains of mice, EL with absence of the third molars and MSM/Msf (MSM) with the normal complement of teeth. It was suggested that the absence of the third molars in EL mice was strongly controlled by genetic factor(s), and was recessively influenced by autosomal genetic factors. The cause of this abnormality, however, was still unclear. The purpose of the present study was to identify the candidate chromosome and to detect the region that included causative gene(s) causing absence of the third molars in EL mice. To screen the linkages between candidate gene and DNA markers, in formative markers were selected from polymorphisms between EL and MSM. Over fifty selected markers Nomura et al. obtained were distributed throughout the autosomal genome. In the present study, all chromosomes were, therefore, examined by the individual genotyping of the 10 F 2 intercross mice [(EL×MSM)F1×F1] with absence of the third molars. In rough mapping, high linkage was obtained at D 3 Mit 141 (genotype ratio of EL homozygous: EL/MSM heterozygous: MSM homozygous 9: 0: 1, χ
2=22.8, p<0.0001). Based on the results, there possibility was found that a candidate gene causing absence of the third molar might exist on chromosome 3. Therefore linkage analysis was performed in detail on chromosome 3. The gene causing absence of the third molars in EL mice was mapped in the region from D 3 Mit 125 to D 3 Mit 17 (genotype ratio 9: 1: 0, χ
2=22.6, p<0.0001) and from D 3 Mit 141 to D 3 Mit 290 (genotype ratio 9: 0: 1, χ
2=22.8, p<0.0001).
View full abstract
-
Mari Takahashi, Yoshiharu Mukai
2002 Volume 40 Issue 1 Pages
64-76
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
We analyzed lip and buccal pressure, and lip movement for the typical command motion in indirect training of swallowing therapy and oral myofunctional therapy to study the mutual correlation and reached conclusions as follows.
1. Lip and buccal pressure, tracing length from apical position of upper lip to one-side point of angulus oris, displacement values of X EY EZ axes of an upper lip position and an angulus oris position, lip width, and lip length change ratio varied depending on the type of command motions.
2. Duration of lip motion was short relative to the acting duration of lip and buccal pressure. For the finishing time, the action of the angulus oris was sooner than those of upper lip and buccal pressures.
3. Lip and buccal pressure did not correlate to lips motion significantly in the command motions such as pulling of the angulus oris, protruding of the lips, and puffing up of the cheeks.
4. In the command motions such as lip contracting and lip pulling and lip puffer, there was significant correlation between the pressure of lips and cheeks, and lip motion.
These findings revealed that lip and buccal pressure, and lip motion varied depending on the type of command motion. suggesting the usefulness of combined command motion. Furthermore, our study showed that it is highly important to assess the motion and intensity of lips when conducting command motion.
View full abstract
-
Yoshihide Okazaki, Keiko Hirano, Tomohiro Higashi, Seiji Yamamoto, Ji ...
2002 Volume 40 Issue 1 Pages
77-83
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
Abstract The subjects of the study were 71 children from 1 to 5 years of age during the primary dentition period. The Cariostat test(CAT 21 test) was examine before the caries treatment and after. The effect was taken from the results based on caries treatment, and was investigated.
1. Before the treatment, the mean d-teeth were 6.13, the mean df-teeth were 7.68, the mean CSI score was 18.4. After the treatment, the mean d-teeth were 0, the mean df-teeth were 7.68, and the mean CSI score were 9.73.
2. Before the treatment,35.2% the CAT score was 2.5 or higher,32.4% the CAT score was 2.0, There was no instance of 0.5 or lower in the CAT score.
3. After the treatment,29.6% the CAT score was 1.0,26.8% the CAT score was 1.5, however,0.5the CAT score increased 9.8%.
4. After the treatment,88% children showed improvement at CAT 2.5 or higher before the treatment, and 60.9% children showed improvement at CAT 2.0.
5. The CAT scores before the treatment highly correlated with all of the caries score(p<0.001). However, after the treatment, no correlation was found between them.
This study suggested that it is important to keep low caries activity in order to prevent new caries based on a periodic recall system after the dental treatment.
View full abstract
-
Part 1. Survey on the visitors
Masato Futatsuki, Misako Inoue, Shin-ichiro Kashiwagi, Minoru Nakata
2002 Volume 40 Issue 1 Pages
84-92
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
“The Dental Health Promotion Class for Infants and Parents”is one of the services at Fukuoka Health Promotion Center. The class is aimed at infants and their parents in the city of Fukuoka, and provides dental examination, dental health education, and topical fluoride application for the children. Visitors are recommended to have family dentists to manage and promote their dental health after the class.
In the present study,436 pairs of visitors were surveyed to evaluate the class and to discuss the future policy.
The standard age of the infants was 2.15 years old, and the rate of first-born children was high at 81.9%. The information about the class was mainly obtained from the campaign at 1.5 year-old medical and dental examinations performed at the health and welfare centers followed by the city newsletters. For most visitors, their purpose was to receive topical fluoride application, indicating general interest in fluoride application among population. Many questions were asked concerning tooth brushing, which showed the importance of tooth brushing instruction for the young visitors to the class.43.9% of the infants were found to have snacks irregularly, which indicated the importance of diet instruction as well. The data of df teeth of the infants was much lower than the standard values in the city of Fukuoka. The results suggest that the parents were highly interested and motivated with respect to dental health. However, most of their children had never received fluoride applications and never visited dental offices. Through this class, parents and children can therefore modify their behavior concerning dental health, and visit dental offices to have family dentists. By further developing this type of projects more domestically, comprehensive dental health promotion including caries, occlusion, gingivitis, periodontitis can be dealt with by family dentists.
View full abstract
-
Tomoko Hagihara
2002 Volume 40 Issue 1 Pages
93-102
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
Quite recently, the number of pediatric patients with temporomandibualr disorders (TMD) seems to be increasing. The reasons for the disorders, however, are still unknown. The bony structures constructing the temporomandibular joint (TMJ) may influence an occurrence of the disorders. The aim of this present study was to analyze the changes of the glenoid fossa during pediatric period using computed tomography (CT) data obtained from selected patients who were imaged for other diagnostic purposes over the maxilla and/or mandible regions. The patients consisted of 72 joints in 36 patients (18 males and 18 females) whose age was between 7 and 12 years. None of the patients had growth abnormalities, such as facial growth disturbance. CT three-dimensional images (3 D images)were constructed according to the so-called“Volume Rendering Technique”. Five subjects were established to analyze the changes of the glenoid fossa; in the vertical dimension, in the anterior to posterior dimension, in the medial to lateral dimension, the location in the axial plane and the angle of the glenoid fossa. To represent the 5 subjects, measuring values were calculated in the 3 D images where axial, coronal and saggital aspects can be observed. For statistical analysis, Spearman's correlation coefficient was used to analyze the correlation between age and the measuring values. Simple linear regression was also done to obtain a linear regression model between them. Of these values, almost all showed significant correlation coefficients with age whereas the values in the anterior to posterior dimension did not. Of the values obtained with significant coefficients, the values in the vertical dimension did not obtain significant linear regression models whereas the remaining values did. The results from the present study suggested that the changes of the glenoid fossa during the pediatric period varied in three dimensions and that further studies are needed to specify the normal growth pattern with other statistical methods, such as logistic regression analysis.
View full abstract
-
Yasuhide Suzuki, Mitsuo Iinuma, Sayoko Yasui, Maki Takata, Yoshie Mine ...
2002 Volume 40 Issue 1 Pages
103-113
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
The object of this study was to investigate the influence of tooth absence on the general growth, progression of aging and longevity in mice. Sixty-eight senescence accelerated mice (SAM P-l Ta)were employed in the study. The animals were partitioned into four experimental groups consisting of the control group (pellets food), the upper molar extraction group (pellets food), the lower molar extraction group (pellets food) and the upper and lower extraction group (pellets food). Body weight, food consumption, grading score of senescence, locomotor activity, amiloidosis of the tongue and life span for each group were measured.
No differences among the groups were found in body weight and quantity of food consumption. The grading score of senescence for the tooth absence groups became higher 20 weeks after birth than those of the control group. There were no differences however, among the three tooth absence groups. Locomotive activity, amiloidosis and life span for the tooth absence groups were found to show the same tendency.
From these results, it was suggested that the tooth absence affects the senescence and life span of the SAM mice.
View full abstract
-
Hideyo Iijima, Seiko Miura, Akiko Aoki, Zenzo Miwa, Yuzo Takagi
2002 Volume 40 Issue 1 Pages
114-118
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
The purpose of this study was to clarifyd the habitual chewing side during primary dentition and examine how it change follow by facial growth and development.46 Children (19 boys,27 girls) in Hellman's dental age IIA, aged from 3 yrs 4 ms∼5 yrs 11 ms, were examined. The chewing cycle of chewing a gummy jelly (masticatory-jelly) was recorded with a record device of the mandibular movement of young children and the recorded data was analyzed:
1. 69.6% of the subjects had their habitual chewing side at right side and 30.4% was at left side.
2. The changes of habitual chewing side correlate with the chronological age: it was difficult to clarifyd the habitual chewing side for the 3-years-old children, though the children older than 5 years came to have their preferred chewing side.
View full abstract
-
Changes in Water Content, Pulverization and Texture of Food Bolus
Toshie Fukushima
2002 Volume 40 Issue 1 Pages
119-131
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
To study the fundamental aspects of normal mastication, we investigated changes in water content, particle size distribution and the texture of a food bolus.
Electromyography (EMG) activity record from the skin over the masseter and mylohyoid muscles during mastication was also measured. Six adults with normal dentition chewed until just before swallowing. The chewing time of the one mouthful of food for each subject was divided into three parts, and the analysis of food bolus and EMG were done at the time of 1/3,2/3 and 3/3 parts for the chewing time of one mouthful of food.
The value of one mouthful of food and the chewing time for each subject were regularly changed, and the fluctuation of these values was small. The pulverization increased regularly during mastication and it depended on the activity of the mylohyoid muscle. The water contents of the food bolus also increased with time, and the mean water content of the boluses for each subject at the swallowing showed regular values. The textures property, hardness, adhesion and gumminess changed drastically at 2/3 chewing time of one mouthful of food, and showed regular values at swallowing irrespective of the sample of food mastication.
These results suggested that pulverization and water contents of the food bolus affect the change in the textural property, and it seemed the measuring of the textural property was one of the important factors in the decision to swallow.
View full abstract
-
Part 2. Behavior modification through the class
Masato Futatsuki, Misako Inoue, Yoshie Iwao, Shin-ichiro Kashiwagi, Mi ...
2002 Volume 40 Issue 1 Pages
132-139
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
“The Dental Health Promoti on Class for Infants and Parents” is one of the services at Fukuoka Health Promotion Center. The class is aimed at pre-school children and their parents in the city of Fukuoka, and provides dental examination, dental counseling, dental health education, and topical fluoride application for the children. Visitors are recommended to have family dentists to manage and promote their dental health after the class.
The part 1 survey revealed the den tal background of the visitors as well as the information about the age, purposes of visit, and dental counseling etc. Based on that data, the contents of the class were re-evaluated, and the future direction of the class was discussed.
The questionnaires were sent to 1007 parents who partic ipated the class to survey the behavior modification on dental health after the class.348 answers received were analyzed. The results showed an improvement in homecare such as tooth-brushing habit and dietary habit among class participants.78.7% of the class participants who answered the questionnaire visited dental offices with the purposes of topical fluoride application, recall check-up, and fissure sealant etc. Also, most of those visited within 6 months after the class. The children who visited pediatric dental offices (64.2%) were found to obtain more positive and multiple preventive approaches when compared to those who visited general-pediatric dental offices. The dental health behavior of the parents was also improved through the class.
It was eva luated that the dental health education in the class was sufficiently effective to improve the dental health behavior of the participants, and the class could be the start of having family dentists.
View full abstract
-
Part 2: Effectiveness on Caries Screening with Combination of the CAT 21 test and the CAT 21 Buf test
Yoshihide Okazaki, Tomohiro Higashi, Tomo Murakami, Yasuhiro Okamoto, ...
2002 Volume 40 Issue 1 Pages
140-147
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
This study was conducted to investigate the relationship of the Cariostat test (CAT 21 test)and salivary buffer test (CAT 21 Buf) to caries status in 173 preschool children.
The effectiveness of combination both tests was also investigated.
The following results were obtained; The caries prevalence and the mean df-teeth of the preschool children aged 6-years was 64.2% and 3.69, respectively.
2. The CAT 21 test and CAT 21 Buf test showed a significant correlation with the df-tooth (p<0.05).
3. The CAT 21 test score did not correlate to the CAT 21 Buf test.
4. When the CAT 21 test score was divided into two groups (low risk/high risk), the mean df-tooth showed a significant difference among the two groups (ANOVA p<0.001).
5. When the CAT 21 Buf score was divided into two (low risk/high risk), the mean df-tooth showed a difference between the two groups (ANOVA p<0.05).
When the CAT 21 test score and the CAT 21 Buf score were combined, the low-low risk group showed the lowest mean df-tooth. On the other hand, the high-high risk group showed the highest mean df-tooth (ANOVA p<0.01).
Based on these results, it is suggested that the CAT 21 test and the CAT 21 Buf test is useful for clinical application of preschool children. Futhermore, when the CAT 21 test and the CAT 21 Buf test were combined, a higher correlation was shown with the carious status.
View full abstract
-
Haruyo Imamura, Keiichiro Tsujino, Kiyoshi Mochizuki, Yumi Ohtawa, Mas ...
2002 Volume 40 Issue 1 Pages
148-154
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
The Japanese Society is now rapidly becoming a aged society with a decreasing number of children. In the age of quick transition, the role of pedodontics is becoming more important with the lowering of the birthrate. The local medical demand is also changing in metropolitan areas where the permanent population is decreasing. Factors surrounding pedodontics are changing.
This survey investigated how the role of pedodontics at a university hospital is changing with time. In this survey, there were 870 children who were brought to the outpatient ward of the pedodontic clinic at Tokyo Dental College Suidobashi Hospital for the first time between April 1996 and March 1999. The subjects were surveyed regarding ages, motives for visiting the clinic, residing areas, and presentation of the letters of introduction. The results were compared with those of the past survey.
Among the first dental examinations, infants, those in early childhood less than six years old and elementary school children accounted for about 40% each, junior and senior high school students accounted for about 15% in total. The number of patients visiting the clinic for dental caries treatment decreased.
An increasing number of cases involved traumatized teeth in young children, malocclusion and abnormal direction of erupting teeth among children with mixed dentition. Many children referred to the clinic for abnormal numbers of teeth, swelling, abnormal direction of erupted teeth, abnormal frenulum and gingivitis.
View full abstract
-
Investigation using Ultrasonography and Electromyogram
Takayuki Suzuki, Hiroyuki Haishima, Yoshiharu Mukai, Seiji Igarashi
2002 Volume 40 Issue 1 Pages
155-165
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
It is known that patients with abnormal swallowing, ex, Down's syndrome, extrude the tongue tip to the outside of his or her mouth. Changing the position of the tongue tip however may effect the tongue movements. There are no reports about this influance. This examination was planed to measure the effects of the tongue position on the tongue movements and the activities of the masseter muscle and supra hyoid muscles. The results as are below:
1. As the tip of tongue extrudes, the depth of the bolus formation on the tongue blade may be decreased, and the width may be increased.
2. As the tip of tongue extrudes, the activities of supra hyoid muscles may be increased.
3. There were no tendencies on the activity of masseter muscle due to changes in the position of the tongue.
4. A time lag between the peaks of masseter muscle and supra hyoid muscles were significant due to decreases, from 100 meec to 20 msec.
5. There were no tendencies toward a time lag between the tongue and palatal contact timing and the peak of supra hyoid muscles, but dispersion of time became greater.
We concluded that when tongue extrudes forward, it may be possible to observe abnormal tongue movement and muscle activity for swallowing that cannot be seen normally.
View full abstract
-
Seiji Yamamoto, Jiro Tsubouchi, Yukie Nakai, Takako Nakato, Seishi Mat ...
2002 Volume 40 Issue 1 Pages
166-170
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
An external dental fistula on the mentum caused by dens in dente is reported. The patient was an 8year old boy who had swelling on the mentum. Oral examination showed no caries on the right mandibular central incisor. A radiolucent image was found at the apical region of this tooth with a radiographic examination. A dens in dente was also recognized in this tooth rediographicaly. Root canal treatment was conducted with a diagnosis of external dental fistula caused by dens in dente. After that, two years of observation continued without any symptoms being revealed.
View full abstract
-
Arisa Sugano, Kunihiko Shimizu, Yoshinori Arai, Kouji Shinoda, Takahid ...
2002 Volume 40 Issue 1 Pages
171-176
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
We found a dens invaginatius radiographically derived in a ten-year, ten-month old girl who was referred to the pediatric dental clinc, Nihon University School of Dentistry at Matsudo with spontaneous pain of the maxillary left lateral incisor, and we surmisd that the dens invaginatus induced periapical periodontitis.
The patient had a fever of 38.0°C, diffuse swelling around the left nosewing and pulsating pain. The number of leukocytes was 1.2×10
3/μ
l at the time of her first medical examination. The radiographic examination showed a radiopaque invaginations extending from the cingulum to the root in the affected tooth, and a periapical radiolucent lesion. Based on the above examinations, we diagnosed her having periapical periodontitis with dens invaginatus of the maxillary left lateral incisor. We conducted an examination of the tooth using 3 DX® (Morita Co. ) in order to confirm the complicated morphology of the dens invaginatus before dental treatment. As a result of images from 3 DX®, we found that the part of invagination was extended from the top of the tooth crown to a distance,19mm into the root (tooth size was 21 mm) in the maxillary left lateral incisor. The direction of the invagination turned toward the mesial site and the apical of invagination did not correspond to the root apex of the lateral incisor. We found two holes in the root canal of the teeth when endodontic treatment was performed with the information from the 3 DX®. One root canal showed a vital response with breeding and pain, and the necrosis contents were observed from another root canal. The root canal treatment and root canal filling with the gutta-percha point therefore were performed on the necrotized root canal. The patient had no symptoms after treatment, and the maxillary left lateral incisor still had a positive response to sensitivity testing.
The 3 DX® images were useful for the diagnosis and treatment of dens invaginatus with complicated morphology.
View full abstract
-
Norihito Ishitani, Koki Shigeta, Hiroko Hasegawa, Tadashi Ogura
2002 Volume 40 Issue 1 Pages
177-182
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
We report the case of a 12-year-old female who came to the Pediatric Dentistry Department of Kagoshima University Dental Hospital with pain in the right TMJ and masseter muscle when opening and closing her mouth. Symptoms of pain were relieved by splint therapy. Subsequently, the appearance of anterior disk displacement without reduction, joint sound and pain in the left TMJ were observed. The symptoms disappeared temporarily with splint therapy supplemented by physical therapies, but reappeared shortly thereafter. We regarded the continuation of these symptoms as attributable to an overload of the retrodiscal tissue (that is, the posterior attachments) by the head of the mandible due to bilateral anterior disk displacement without reduction. We reconsidered a treatment strategy based on the hypothesis that the overload should be mitigated by moving the head of the mandible to the front lower part. A mandibular anterior repositioning splint was therefore applied. Joint sounds, movement, and oppressive pain subsequently resolved. Splint therapy continued in order to observe the progress after resolution of the symptoms. Progress was so satisfactory that occlusal treatment to construct a new mandibular position was undertaken. In this case, a new centric occlusion was constructed by passive eruption of the molars. Six months later, after termination of the occlusal treatment, the condition of the patient's TMJ is good. The results of the present case suggest that occlusal treatment may represent a superior means of effecting a cure in certain types of cases.
View full abstract
-
Toshie Fukushima, Kazunori Takamori, Yoshiaki Ono, Kenichi Suse, Yoshi ...
2002 Volume 40 Issue 1 Pages
183-188
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
drooling and feeding disabilities. In order to examine the cause of the abnormality of the chewing function, a developmental test, chewing test, salivary flow rate, lip pressure, electromyography(chewing cycle, muscle activity), Dental Prescale®test(occlusaclo ntact area, biting strength, occlusal pressure) were used.
The results of these examinations showed that the resting and stimulated saliva was in the normal range and the rip closing pressure was greater than the normal range. However, the occlusal contact area and biting strength, occlusal pressure and masticatory efficiency were smaller than the normal range. These findings revealed that the chewing ability of the patient was inferior to the normal range and it took a long time to create the state of swallowing for the properties of food bolus. Sinusitis causes lip closing failure and drooling.
These results of the physiological examination seemed to be effective for the diagnosis of the feeding disabilities.
View full abstract
-
Zhou Jing, Hiroaki Kobayashi, Naoko Kannari, Yo Taguchi, Toshikazu Asa ...
2002 Volume 40 Issue 1 Pages
189-197
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
Eruption disturbance of the second permanent molar is rare in clinical pediatric dentistry. In the present case, the patient had four cystic lesions adjacent to the upper and the lower bilateral permanent second molars at 13 years 10 months of age. Out of them, three molars were delayed in erupting. In the mandible, the left second permanent molar impacted horizontally and the crown was included in the cystic lesion. Fourteen months after surgical exposure of the impacted molar and the lesion, the radiolucent area of the cyst was abolished and replaced by new bone. Thereafter, the second molar was guided for eruption and aligned properly within the dentition. On the other side, the cystic legion adjacent to the erupted right second permanent molar was surgically exposed and healed 3 months later. In the maxilla, cystic legions were detected bilaterally over the crowns of the unerupted second molars. Although the right second molar erupted spontaneously at the age of 14 years 9 months, the left one was surgically exposed at the age of 16 years 1 month because of non-eruption and swelling.
The main causes for the eruption disturbance of the three permanent second molars were presumed to be pressure of the cystic lesion and/or abnormal eruptive direction of the tooth germ. It seems to be quite rare for the four cystic lesions to occur adjacent to all of the second molars. Although the present patient is not suspected to have a basal cell nevus syndrome, careful observation will be important in her case to be carried out from puberty to around 35 years of age when the disease often appears.
View full abstract
-
Keiichiro Tsujino, Kiyoshi Mochizuki, Yumi Ohtawa, Masashi Yakushiji, ...
2002 Volume 40 Issue 1 Pages
198-203
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
It is rare that the epulis occurs in pediatrics patients, and epulis is subdivided into several types. Among them, epulis fibrosa osteoplastica is relatively rare.
We reported two cases of epulis fibrosa osteoplastica on the maxillary deciduous second molar region in a 7-year-old male and on the maxillary lateral incisor region in a 9-year-old male.
Case 1: The patient came with tumefaction of the gingival as his chief complaints. It occurred in the gingiva in the maxillary left deciduous second molar region, and the maxillary left deciduous second molar was extracted, the maxillary left second premolar not having come out yet. The tumor was removed surgically under local anesthesia. The second premolar came out soon after surgery.
Case 2: The patient came with tumefaction of the gingival as his chief complaints. It occurred in the gingiva in the maxillary right lateral incisor region. The tumor appeared just after right deciduous lateral incisor fell out. The tumor was removed surgically under local anesthesia.
Histopathologically, both cases were epulis fibrosa osteoplastica.
In both cases, the prognoses of have been good and no recurrence has been observed to date.
View full abstract
-
2002 Volume 40 Issue 1 Pages
204-244
Published: March 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL
FREE ACCESS
