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Volume 40 (2002)
- Issue 5 Pages 761-
- Issue 4 Pages 593-
- Issue 3 Pages 441-
- Issue 2 Pages 251-
- Issue 1 Pages 1-
Volume 40, Issue 5
Displaying 1-15 of 15 articles from this issue
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Using OrthopantomogramsYukiko Kato, Miyuki Okamoto, [in Japanese], Motohiro Kikuchi, Masahumi ...2002 Volume 40 Issue 5 Pages 761-767
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIn the development of normal permanent dentition, it is a necessary condition that deciduous teeth and succedaneous permanent teeth change places at a regular period and in normal sequence. However, some succedaneous permanent teeth develop a delay in the eruption period or impact clinically due to various causes.
With Orthopantomographs of ambulatory patients as the material used in the study, the frequency by tooth group of impacted teeth and the crown-root formative status of the delayed eruption of teeth were discussed using a total of 66 subjects in whom impaction was observed 2 SD later or longer than the reference value for the eruption period of Japanese children, and the following conclusions were obtained:
1. The incidence of the delayed eruption of teeth showed no difference based on sex.
2. One tooth was largest in the number of delayed eruptions of teeth per child patient. In the maxilla, the delayed eruption of teeth most often occurred among the central incisors, followed by the canines, lateral incisors. The number was extremely low in the lower jaw compared with the upper jaws.
3. The crown-root formative status was apt to lag behind in the delayed side.
4. Abnormal erupting direction and lack of erupting space caused impaction in many cases.View full abstractDownload PDF (1122K) -
Hiromi Murata, Kenji Arita, Mizuho Nishino2002 Volume 40 Issue 5 Pages 768-774
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of this study was to investigate the frequency of the anginosus group streptococci isolated from apical periodontitis of deciduous teeth.
The pus samples from root canals (3 cases) or from gingival abscesses (4 cases) of deciduous teeth in 7 children who were from 3 years and 1 month old to 9 years 6 months old, were gathered and anginosus group streptococci were isolated using Streptogram®(Wako)a nd 16 S rRNA sequencing.
In 7 cases, S. anginosus was isolated from 3 cases, S. intermedius was isolated from 2 cases, and S. constellatus was isolated from 1 case. Among the samples in 1 case, S. anginosus and S. intermedius were isolated. The anginosus group streptococci were isolated from 5 cases in 7 cases,71.4%.
This is the first report showing isolation of anginosus group streptococci from the apical periodontitis of deciduous teeth using the method mentioned above.View full abstractDownload PDF (1312K) -
(I): A questionnaire survey on dentition/occlusionAyako Asano, Katsuya Ogasawara, Etsuko Nomura, Mizuho Motegi, Reiko Og ...2002 Volume 40 Issue 5 Pages 775-782
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSAs a part of a special project promoting The“8020”Campaign in Yamanashi Prefecture, we carried out a survey on denture/occlusion in children and their parents in a model primary school to promote occlusal guidance from childhood. The following results were obtained.
1. Of the parents,37.5% considered the teeth of their child to be“even”and 39.4% to be“uneven”.
2. As the cause of uneven teeth,“The child does not eat hard foods”was the most frequent reply (35.2%) while“genetic inheritance”was infrequently observed (9.8%).
3. For children who experienced orthodontic treatment, the treatment was initiated most frequently“on the advice of a dentist”(40.9%), followed by“at parent's wish”(34.1%) and“at child's wish”(13.6%).
4. The reason for orthodontic treatment was most frequently“appearance”(46.3%). Aesthetic reasons were more frequently observed than functional ones.
5. The most frequent bad oral habit was“nail biting”(34.9%), followed by“finger sucking”(21.7%).
6.“Stuffed nose”(34.6%) and“mouth breathing”(27.3%) were frequently observed, suggesting an association between otorhinolaryngological disorders and breathing through the mouth.View full abstractDownload PDF (1165K) -
(II): Results of Examination for Stomatognathic FunctionHideyo Iijima, Katuya Ogasawara, Ayako Asano, Mizuho Motegi, Reiko Oga ...2002 Volume 40 Issue 5 Pages 783-789
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSAs a part of an occlusal guidance project promoting the“8020”Campaign, we performed examinations of stomatognathic function and oral habits in a model primary school for occlusal guidance from childhood to obtain better permanent dentures.
The following results were obtained.
1. The maximum occlusal force and the maximum opening range of mandibular increased with age.
2. The incidence of temporamandibular joint noise was 9.3% in all children and high at ages 6 and 12.
3. The incidence of breathing through the mouth. was 27.4% in all children, and that of the mouth opening at rest was 34.4%.
4. The incidence of abnormal swallowing was 18.0% in all children, and that of the tongue thrust habit was 14.5%. Each incidence decreased with age.View full abstractDownload PDF (3318K) -
Jun Sakabe, Ichiro Nakajima, Kazuya Honda, Shoji Nakagawa, Miyako Itoh ...2002 Volume 40 Issue 5 Pages 790-796
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSObjective: The 3 DX Multi Image Micro CT (3 DX) is a novel X-ray CT used limited cone beam. This study has determined the reproducibility among observers and accuracy in measurement of the size of an extracted tooth on the 3 DX images.
Methods: An impacted supernumerary tooth extracted from the median maxilla was the subject of this study. The width and length of the tooth on the 3 DX images were measured 5 times by 5 individual observers. Significant differences in values among the observers in the measuring distance between 2 points on an image without opaque spots (Image 1) were determined by one way ANOVA for examining reproducibility. In addition, the coefficients of validity (CVs) were calculated from the values associated with Image 1 and those associated with the other image with the opaque spots (Image 2). They were compared respectively to the CV obtain as control with a digital caliper (DC) using Wilcoxon's T-test for examining accuracy.
Results: Of the measured values pertaining to Image 1, there was no significant difference among the observers (p>0.05). The CVs associated with both images were significantly higher than the CV associated with DC when the width was measured (p<0.05). On the other hand, the CVs associated with both images were not significantly higher than the CV associated with DC when the length was measured (p<0.05).
Conclusions: High reproducibility was obtained in measuring the size of tooth on the 3 DX image. High accuracy was detected in measuring the length of the tooth. Low accuracy was detected however, in measuring the width of the tooth, suggesting that repeated measurement is necessary to minimize variation of the width of the tooth.View full abstractDownload PDF (4439K) -
Norihito Ishitani, Koki Shigeta, Hiroko Hasegawa, Tomonori Iwasaki, Ta ...2002 Volume 40 Issue 5 Pages 797-802
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSWe investigated clinical data concerning adolescent patients who were referred to the Pediatric Dentistry CLinic in Kagoshima University Dental Hospital for consultation and treatment of TMJ Dysfunction Syndrome during a period of 20 years, from 1982 to 2001. We also examined the difference between the data obtained during the first 10 years and those obtained during the second 10years. The results are as follows.
1. The number of patients during the second 10 years increased compared with that during the first 10years.
2. The ratio of female patients showed a higher frequency than the ratio of male patients for the 20years. Furthermore, it showed a higher frequency during the second 10 years than during the first 10years.
3. The ratio of pains was higher and the ratio of sounds was lower during the second 10 years than those during the first 10 years in the number of the patients categorized by the chief complaint, the number of initial symptoms felt by patients, and the number of clinical symptoms at the first medical examination.
4. The frequency in the use of occlusal treatment decreased greatly and the frequencies in use of physical therapy and drug therapy increased greatly during the second 10 years compared with during the first 10 years.
5. There was no significant difference in the effect obtained by treatment between during the first 10years and during the second 10 years.View full abstractDownload PDF (2088K) -
Michiyo Miyashin, Miho Ebashi, Chiho Kubota, Yuko Matsumura, Hisako Ka ...2002 Volume 40 Issue 5 Pages 803-809
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIn an attempt to evaluate the prognosis of traumatized primary teeth with root fracture, a clinical and radiographical follow-up study was made in 9 child patients with a total of 11 traumatized primary incisors with root fracture, until their permanent successors erupted.
The subjects included children aged 1 to 5 at the first visits, and 7 children (9 teeth) who had their first visit within 2 days of the trauma.
At the initial examination,10 teeth exhibited markedly increased mobility with displacemet and were treated by fixation and tooth cleaning for 43 to 88 days. One tooth exhibited slight mobility with no displacement and was observed only.
Consequences of these primary teeth comprised in this study, all of the teeth survived normally. The coronal and apical fragments were separated by a narrow radiolucent line, and there was evidence of peripheral rounding of the fracture edges and normal root resorption. Ten teeth (91 %) developed pulp canal obliteration after 5 month. Two teeth (18%) showed pulp necrosis and periodontitis within 3 months and 49 months. Eight teeth (73%) showed discoloration. For the permanent successors, a small white spot was observed in one tooth.View full abstractDownload PDF (3440K) -
Hiroko Kidokoro2002 Volume 40 Issue 5 Pages 810-824
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSTo investigate the effects of food hardness on the masticatory muscle activity during mastication in children with Hellman's II A stage dentition, the electromyographic(EMG) activity was recorded using RT, RM, SH, TH. A total of 37 subjects were instructed to chew gelatin samples(gumi candy) of varying hardness. Subjects with normal dentition were selected from patients who visited the Tsurumi University Dental Hospital of Pediatric Dentistry. The results obtained were as follows:
1. In all of the subjects, there were no significant differences in the amplitude of EMG activity for the right anterior temporal muscle(RT) and right masseter muscle(RM. ) when the subjects chewed gumi candy with 10% or 20% in each chewing stage(the early stage is 10 strokes from the start of masstication and the late stage is 10 strokes prior to swallowing).
2. When the amplitudes of RT activity at the early stage were compared among the subjects, it was possible to divide them into two groups. The amplitude of muscle activity for chewing the 20% gumi candy was higher than that for chewing the 10% gumi candy in 26 of the 37 subjects of the increase group. In contrast, the amplitude of muscle activity for chewing the 20% gumi candy was lower than that for chewing the 10% gumi candy in 11 of the 37 subjects of the decrease group.
3. In the increase group, the amplitude of RT activity of the early stage, the number of chewing strokes and chewing time until swallowing increased with the increase in the hardness of the chewing materials.
4. In the decrease group, the amplitude of RT activities decreased at the early stage, while the number of chewing strokes and chewing time increased with the increase in the hardness of the chewing materials. These results suggest that children in the decrease group responded to increments in the hardness of food by chewing strokes and time without the increase jaw-closing muscle activity, which might be caused by everyday eating habits rather than by immature development of the masticatory muscles.View full abstractDownload PDF (2286K) -
Toshiya Endo, Yoshiko Mizutani, Mifumi Kubota, Rieko Ozoe, Koji Kojima ...2002 Volume 40 Issue 5 Pages 825-831
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe relevancy of the outcome of functional examinations to maxillofacial morphology was looked into in patients treated with bionators, along with the usefulness of these functional examinations in bionator therapy. The bionators were applied to those patients who felt compressive forces on the temporomandibular joint (TMJ) and tenderness on the posterior belly of the digastric muscle. Our findings were as follows
1. Maxillofacial morphometry revealed that values representing convexity and SNB were significantly small and that those for SNA, ANB and over jet were significantly large.
2. Skeletal retrusion of the mandible was confirmed morphologically, thus proving that the results of functional examinations were consistent with those of morphological examinations.
3. The distribution of molar relationships showed that bilateral class II malocclusions were predominant, followed by bilateral/unilateral class I malocclusions.
4. Bilateral class II molar relationships were of no use as a yardstick for determining mandibular retrusion.
5. Palpation scores had significantly negative correlations with values for convexity, SNP and Ul to L1, and significantly positive correlations with those for ANB, ramus inclination and overjet.
6. The palpation score went up as the mandibular retraction progressed.
From the above, we concluded that the results of functional examinations of compression on the TMJ and tenderness on the posterior belly of the digastric muscle are useful for clinical diagnosis of mandibular retrusion. The functional examination method we employed also proved useful for determining the application of bionators.View full abstractDownload PDF (1114K) -
Tsuguko Kondo, Kazuhiko Koyama, Yasuo Tamura2002 Volume 40 Issue 5 Pages 832-842
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of the present study was to investigate the development of the masticatory function, the occlusal force and primary canine distance in children with extremely low and very low birthweight (EVLBW).
The subjects were nine children aged 4.3 to 5.8 yrs (mean 5.0 yrs old) who were born with EVLBW and 16 healthy and normal birthweight children as controls with ages matched those with extremely low and very low birthweight. In seven children of the EVLBW the development of mastication had been observed continuously for 1.5 years. Electromyography (EMG) were recorded while chewing from the bilateral temporal and masseter muscles, and the unilateral digastric muscle. The occlusal contact area and the occlusal force were measured using the bite pressure detecting system Dental Prescale®.
The occlusal contact area, occulusal force and bilateral primary canine distance of those with EVLBW were significantly smaller than those with normal birthweight children. However, the muscle activity of those with EVLBW was found to be significantly higher than that of those with normal birthweight children. According to growth and development for 1.5 years, both the values of occulusal contact area and the occulusal force for those with EVLBW significantly increased, whereas muscle activities of those with EVLBW decreased.
In conclusion, it is suggested that the masticatory muscles of those with EVLBW when chewing would be much more activated to compensate for their low occulusal force, but their masticatory function might be caught up in an earlier stage than their general growth.View full abstractDownload PDF (2189K) -
A comparison of the present status with that of 20 years agoTakahiro Funatsu, Hiroki Matsumoto, Mitsuro Tanaka2002 Volume 40 Issue 5 Pages 843-850
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSFor the purpose of analyzing the differences in tooth size of deciduous teeth between the present and twenty years ago, we compared the plaster models in deciduous dentition obtained from 71 children (36 males,35 females) who visited our clinic between 1994 and 2000 and those of 68 children (33 males,35 females) who visited us between 1974 and 1980. The correlation between tooth size and interdental spaces was also investigated.
The mesiodistal width of the deciduous tooth crowns of boys showed no significant change during the last twenty years. In contrast, that of girls was larger for every type of tooth. Statistically significant differences were observed in maxillary deciduous central incisors, mandibular deciduous lateral incisors and mandibular deciduous canines. The same tendency was observed in the buccolingal width.
As for girls, the types and prevalence of interdental spaces in the deciduous dentition of the present generation was similar to those of twenty years ago, but for boys, the ratio of the closed type deciduous dentition decreased during the last twenty years.
The size of the tooth crown in deciduous dentition showed a tendency to be larger in the closed type than in the spaced type.View full abstractDownload PDF (1148K) -
From April 2000 to March 2002Tomoko Kitamura, Keiichiro Tsujino, Kiyoshi Mochizuki, Yumi Ohtawa, Ma ...2002 Volume 40 Issue 5 Pages 851-857
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSGeneral dental treatment for a child is performed with pediatric dentistry, and its contents of dental treatment are various. Recently, there has been a decrease in dental caries of children and the emergence of an ageing society with a diminishing child population, in Japan. Under these influences, it is thought that the contents of dental treatment in pediatric dentistry have changed. We considered it important to understand the contents of dental treatment in the pediatric dentistry.
This survey was performed on the contents of dental treatment for the children who visited the outpatient ward of pediatric dentistry, Tokyo Dental College Suidobashi Hospital for two years from April 2000 to March 2002, and the following conclusions were obtained:
1. In the last five years, the total number of patients and the number of new patients increased from April 1998 to March 2001.
2. The total number of patients and the number of new patients was highest in August, and followed by in March, July, and December.
3. About 40% of the whole involved caries treatment.
4. The percentage of the dental caries treatment was mostly performed for the lower aged children. The percentage of dental caries prevention was performed about equally for those from 6 to 15 years of age. The percentage of orthodontic treatment was at its peak at 10 year olds and 13 year olds.
5. For the recall examination for patients, about 60% involved dental caries prevention and about 20% involved dental caries treatment.View full abstractDownload PDF (3283K) -
Mizuka Yamaoka, Seiji Yamamoto, Jiro Tsubouchi, Yukie Nakai, Noriko Ya ...2002 Volume 40 Issue 5 Pages 858-862
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThis case report describes a 46 month-old boy with a complete impaction of the left second primary mandibular molar. We applied marsupialization and traction treatment and conducted a followup for 9 years and 4 months. The following clinical results were obtained:
1) After the observation period of six months from the initial visit, marsupialization and traction treatment were applied. In this period, it was suspected that based on radiographic examination the tooth germ of the left mandibular premolar was congenitally missing.
2) Two years and 9 months after marsupialization, radiographs showed the tooth germ of the left mandibular second premolar.
3) Nine years and 4 months after marsupialization and traction treatment, the occlusal balance of the left mandibular second premolar was attained.
Because impacted primary teeth may affect the development and eruption of the permanent successors, long-term observation is therefore necessary until the permanent successors erupt.View full abstractDownload PDF (1968K) -
Michitoki Kinehara2002 Volume 40 Issue 5 Pages 863-868
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSTwo cases of fracture of dens evaginatus in children are described.
The first case; a 15-year-old girl was referred to the Division of Dentistry, Chiba Children's Hospital, because of swelling in the right mandibular region. A radiolucent region at the apex of the lower right second premolar was confirmed by radiographic examination, and fracture of dens evaginatus of the premolar was found. Root canal treatment of the tooth was begun, and the root canal was filled with calcium hydroxide two weeks later. The radiolucent area of the root apex gradually expanded in spite of the root canal treatment. So, extraction of the apical lesion, apicoectomy and filling of the root canal with gutta-percha points were performed under general anesthesia 10 months after the initial treatment. A radicular cyst was diagnosed through histopathological examination. One-year postoperative radiographs revealed a complete repair at the periapex of the tooth.
The second case; an 11-year-old girl was referred to the Division of Dentistry, Chiba Children's Hospital, because of swelling in the right buccal region and fever. She was diagnosed with periosteitis due to fracture of dens evaginatus of the right lower first premolar. The inflammatory reaction quickly disappeared with the administration of antibiotics and anodyne.
The radicular pulp was expected to be viable, so the tooth was kept under medical observation without endodontic treatment for several months. The root of the tooth continued developing for four months after the onset, but a fistula adjacent to the tooth occurred. Following completion of endodontic treatment of the tooth, the fistula disappeared.View full abstractDownload PDF (3167K) -
Reishi Seo, Yoshiaki Okamoto, Hirohumi Ishikawa, Takao Miyoshi, Takamo ...2002 Volume 40 Issue 5 Pages 869-875
Published: December 25, 2002
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIt is well known that in childhood the dentigerous cyst, which is the most common of the jaw cysts, develops in association with the apical lesion of the deciduous predecessor, without inflammatory causes.
In this case of an 8 year old boy, the cystic tissue, located at the center of the right upper central and lateral incisors, caused significant disturbance in the eruption and developmental anomaly. After surgical treatment of the marsupialization, occlusal guidance was exerted through the traction of the permanent teeth and orthodontic treatment, which lasted from the commenced eruption of the permanent incisors to the attained eruption of the second permanent molars. This long-term observation, confirmed that a good permanent dentition was obtained in both the functional and aesthetical aspectsView full abstractDownload PDF (6548K)
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