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Volume 45 (2007)
- Issue 5 Pages 571-
- Issue 4 Pages 451-
- Issue 3 Pages 377-
- Issue 2 Pages 207-
- Issue 1 Pages 1-
Volume 45, Issue 1
Displaying 1-19 of 19 articles from this issue
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Part II: Differences among foodsYoshihiro Nishida, Hiromi Nakahara, Naonori Saito, Shinobu Hasegawa, Y ...2007 Volume 45 Issue 1 Pages 1-7
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of the present study was to obtain fundamental data concerning about the tongue movements while swallowing in order to establish in objective evaluation for tongue movements using the simultaneous recording system with the tongue pressure changes to the palate and the masticatory muscles activity.
Seven subjects who were diagnosed to have normal deglutition participated in the study. For measurements of tongue movements, the artificial palatal plate was prepared, in which three strain gauges for measuring tongue pressure were installed at three positions in the mid line of the palate, frontal, middle and rear parts of the palate antero-posteriorly. The tongue pressure changes and the masticatory muscles activity were measured while swallowing 5 ml of water,5 g of pudding and 5 g of gummy jelly, respectively. The measurements were performed at 3 days later after putting on the artificial palatal plate. The onset of the deglutition was so defined that the larynx rose up to the anterior direction.
Onset and offset of the tongue pressure differed significantly among the test foods. A double-peak pattern and a single-peak pattern were seen from the tongue pressure tracings. The 1st peak was detected at each sensor in the order of frontal, middle and rear, and 2nd peak roughly simultaneously.
It was suggested that the 1st peak was associated with transport of a bolus to the posterior direction in the oral cavity, and that the 2nd peak was associated with the act of swallowing. Key words: Swallowing, Food differences, Tongue pressure changes, Masticatory muscles, ElectromyogramsView full abstractDownload PDF (3036K) -
Kumiko Shimizu, Kentarou Tsuruyama2007 Volume 45 Issue 1 Pages 8-15
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIn this study, we focused on the relationship between the presence of the joint effusion and the morphological features of the temporomandibular joint (TMJ) on MR images in youngsters. The categories of the absence of the joint effusion included no fluid and the presence of the joint effusion included minimal fluid moderate fluid, marked fluid and extensive fluid on TMJ sagittal MR images. Multivariate analysis was used to determine the etiological factors of the presence of the joint effusion on MR images.
The results of this study indicated that the presence of the joint effusion on MR images related to the severe and intermediate anterior disc displacement, deformed articular eminence, anterior disc displacement without reduction and biplanar disc configuration. This study concluded that the presence of the joint effusion on MR images highly correlated to TMJ internal derangement such as disc configuration and morphological feature of the articular eminence.View full abstractDownload PDF (2128K) -
Kei Ogawa2007 Volume 45 Issue 1 Pages 16-28
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIn this article, the author examined the difference in the susceptibility to tooth attrition between C 57 BL/6 and C 3 H mice. These mice,21 days old, were divided into 4 groups as follows, the solid standard chow, the powdered standard chow, the solid high-cholesterol diet and the powdered highcholesterol diet groups. Mandibular bones were obtained at 150 days or 240 days after commencement of the experiment. Attrition in the molars was observed using Micro-CT and compared among the four groups. The degrees of attrition were evaluated according to areas of dentin exposure on the occlusal surface and the volume of the crown. In all of the groups, C 3 H mice showed a higher level of attrition compared with C 57 BL/6 mice. C 3 H mice fed with a powdered high-cholesterol diet for 240 days showed significant attrition among all of the C 3 H groups. The author therefore concluded that C 57 BL/6 mice were less susceptible to attrition than C 3 H mice. The purpose of this study was to examine the inheritance factor affecting attrition. Two mice strains F 1 (8) and F 2 (16) were fed with high-choresterol diet for 240 days. The levels of susceptibility to attrition between the two strains were then evaluated using methods mention above.
The results showed that all F 1 (8) mice were in the low group, while F 2 mice were di vided into high and low groups (7 mice were in the high group and 9 mice were in the low group).
According to the results, C 3 H mice were more susceptible to attrition than C 57 BL /6 mice. The author seemed to obtain model mice strains with high and low susceptibility to attrition, respectively. Since F 2 mice were divided into two groups, the author suggested that the trait involving attrition was inherited separately in F 2 mice.View full abstractDownload PDF (5198K) -
(IV) The Relationship between the force of a Lip Closure and state of a lip closure in daily life in primary school children.Norihiko Murata, Toshiaki Ono, Munenori Shibata, Tetsuya Aoyama, Shiho ...2007 Volume 45 Issue 1 Pages 29-34
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe aim of the present study was to investigate the relationship between changes based on age in the force of a lip closure and breathing in daily life in childhood. The subjects in this study were 467children from 6 to 12 years old and their guardians. We measured the children with respect to the force of a lip closure and investigated the questionnaires which the guardians had answered. The following results were obtained:
1. There was no significant change in the force of lip closure of the group less than 9 years old concerning all items of the questionnaire.
2. In the group of 9 years of age or more, the force of the lip closure of the children who were always opening their mouth was significantly smaller than that of children who occasionally opened their mouth and children who constantly closed their mouth. The force of the lip closure of children who breathed through the mouth and children who breathed through both the mouth and the nose was significantly smaller than that of children who breathed through the nose.
These results suggest that acquiring a correct way of breathing until approximately 9 years old leads to the improvement of the force of a lip closure and the prevention of malocclusion etc.View full abstractDownload PDF (1489K) -
Eri Motoda2007 Volume 45 Issue 1 Pages 35-44
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSFor this article, the author investigated the synaptic relation ship between hypoglossal motor neurons and the surrounding interneurons in rats in the sucking stage. A series of three studies involving, retrograde study of hypoglossal nerve innervating on the tongue muscle, nystatin perforated whole-cell patch clamp investigation on the hypoglossal motor neuron and the morphology of hypoglossal motor neurons with biocytin, were designed to test this thesis. Retrograde study of hypoglossal neurons indicated that the hypoglossal nucleus was observed as on oval shaped region in the dorso-medial part of the brainstem. Whole cell patch clamp investigation of the hypoglossal motor neurons showed that stimulation of the surrounding areas evoked both excitatory and inhibitory postsynaptic potentials in the hypoglossal motor neurons. Most of these interneurons showed monosynaptic potential, and were intermingled in the surrounding area. Electrical stimulation of IOK, NX, PMn and LRt evoked a polysynaptic potential in the hypoglossal motor neurons. Biphasic postsynaptic potentials were elicited through electrical stimulation of GeV. Morphological study of the hypoglossal motor neuron indicated that hypoglossal motor neurons projecting into the surrounding interneurons were bipolar cells or pseudo-unipolar cells. The author concluded that interneurons of the area surrounding the hypoglossal nucleus may participate in the brainstem circuitry responsible for generating rhythmic tongue movements, and coordinate tongue movements with jaw movements.View full abstractDownload PDF (3102K) -
In Case of the Clamp for Deciduous MolarHirotoshi Baba, Shohachi Shimooka, Satoshi Tanaka, Hiroaki Honma2007 Volume 45 Issue 1 Pages 45-50
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIn dental education the model core curriculum include “the rubber dam dry field method” and the students have to select the right rubber dam clamp to use. We conducted an experiment using the rubber dam clamps as the visual material for the purpose of discovering how the students recognize the clamps and we came to the conclusion as follows.
1. The eye movement tracks starting to scan from the target clamp to the No. P 1 clamp were classified into three types.
2. It was supposed that the scanning directions were determined by peripheral vision. Half of the examinees started to scan the clamp from that of a similar (or same) target and the remainder started from the clamps unlike the target.
3. In the look which dissipated from the one different from the target, the number of stops, and the duration of the stops showed a tendency to be numerous.
4. Each case of error in recognizing the figure of the rubber dam clamp was observed in a “clockwise”pattern.
Upon analysis, it was suggested that attentive information search worked in the eye movements that started to scan from the clamp unlike shaped to the target first rather than those which started from that similar shaped to the target.View full abstractDownload PDF (1142K) -
C omparison between 1994 and 2004Hiroki Imai, Shuhei Kubo, Masashi Yakushiji, Qin Liang, Sizhen Shi2007 Volume 45 Issue 1 Pages 51-57
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSWe have performed oral examination of kindergarten students in Shanghai since 1994. In this study, changes in the oral health status of children were evaluated by comparing the results of surveys in 1994 and 2004. In both years, the subjects were children aged 3-5 years. A total of 442 children (227 males and 215 females) were evaluated in 1994 and 185 children (100 males and 85 females) in 2004. Among the deciduous teeth, caries prevalence and the mean dft, dt, ft, and dfs/child were lower in 2004 than in 1994 in each age group and significantly lower in the groups aged 4 or 5 years.
The incidence of malocclusion was similar between 1994 and 2004, but the incidence of maxillary protraction alone slightly increased.
In the kindergartens investigated in the surveys, caries prevalence decreased due to improvement in oral hygiene education, showing improvement in the oral health state. Further surveys on malocclusion are necessary in association with oral habits, milk feeding methods and periods, and the home environment.View full abstractDownload PDF (1022K) -
Yukako Kogue, Kazuko Igari, Ayako Kudo, Nobue Goto, Yuriko Hozumi, Hid ...2007 Volume 45 Issue 1 Pages 58-64
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of this study was to investigate the relationship between the force of lip closure and the masticatory function in young children. The subjects in this study were 92 nursery school children from 4 to 6 years of age. The force of the lip closure was measured using the measuring device for the lip closing force and the masticatory function was evaluated using the ATP spectrometric method. The Crush rate of ATP during free chewing for 30 seconds was used as the masticatory function. Masticatory function and the number of chewing strokes were used to determine the masticatory efficiency. The following results were obtained:
1. The mean force of lip closure of all of the children was 5.53±0.26N(mean±SE.).
2. Neither the lip closure force nor the masticatory function showed statistically significant differences between boys and girls, according to occlusion type.
3. There were statistically significant correlations between the force of lip closure and masticatory efficiency (r =0.301 p=0.004), and masticatory efficiency (r=0.269 p =0.010), respectively. On the other hand, there was no significant correlation between the number of chewing strokes and the masticatory function (r=0.178 p=0.087).View full abstractDownload PDF (2193K) -
Yousuke Ga, Yoshizou Okamoto, Atuko Baba, Wataru Motokawa, Koji Miyaza ...2007 Volume 45 Issue 1 Pages 65-73
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSTwo kinds of APF with different properties [Liquid type APF(L-APF group)·Gel type APF(GAPF group)] were treated to examine the effect of APF on enamel with changes in the microstructure of the enamel surface, the atomic analysis of the cross section of the enamel, measurement of the amount of extraction of the fluoride of alkaline solubility and changes in the acid resistance ability of enamel by using bovine enamel.
1. The spheroidal structures were obtained in both the L- and G- APF groups. The size in the G-APF group was slightly larger than in the L-APF group.
2. EPMA analysis showed larger amount of fluoride uptake and infiltration in the L-APF group than in the G-APF group after APF treatment of the enamel.
3. The amount of the L-APF group alkaline solubility fluorine was significantly greater than that of the G-APF group.
4. As a result of an acid resistance examination, the acid resistance in the L-APF group was treated with APF found to be significantly higher than that of the control group (no APF treated group).
From the above-mentioned results, it was suggested that L-APF was more effective in caries prevention than G-APF.View full abstractDownload PDF (3365K) -
Shigeko Igeta, Mitsuko Miyanaga, Mikiko Ono, Takao Kato, Takahide Maed ...2007 Volume 45 Issue 1 Pages 74-80
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSImplant treatment has been commonly used in dental treatment in adults, but, only few adolescent cases have been reported. The number of adolescent implant treatment applicants has recently increased.
The aim of the present study was to investigate the actual conditions with reference to oral implants in adolescents visiting our dental hospital.
We analyzed 59 patients (16 boys and 43 girls, between 12 and 20 years of age) who were missing teeth, throuth congenital absence or trauma. Where the implant techniques were found to be a realistic choice in these patients was in cases of trauma, congenital absence and the use of orthodontic anchor. They did not anticipant preparation of the teeth and so patients were interested in occlusion recovery and aesthetically with teeth.
The implants were installed to replace upper and lower incisors, in premolar or molar regions. Bone graft, veneer graft or guided bone regeneration had been executed before the implant operation.
Adolescent patient have some problems with bone growth, but implant treatment was able to be undertaken for patients as long as there sufficient care on the part of the dentists. Therefore clinical assessment of implant treatment for adolescents should be defined as something to improve the quality of life for patients.
The results show that dental implants are a good treatment option for replacing missing teeth in adolescents, and need to be considered in total planning of treatment.
Oral rehabilitation with dental implants supporting prosthetic constructions seems to be a good alternative in adolescents with missing teeth.View full abstractDownload PDF (1179K) -
Masayuki Kaga, Hideaki Iwabuchi, Koichi Nakamura, Masanori Hashimoto, ...2007 Volume 45 Issue 1 Pages 81-87
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of this study was to investigate the characteristics of the newly developed set paste/paste type light-cured restorative glass-ionomer cement “FujiFil LC”. The glass-ionomer cement was improved in transparency after light curing and in the mixing procedure. The interfacial ultra-structure between the glass-ionomer cement and human enamel/dentin was observed using SEM. The characteristic potential of fluoride-release and uptake of FujiFil LC was also determined. In addition, to investigate the recharge effect of fluoride on glass ionomer cements, specimens (9 mm diameter x 1 mm in height) were immersed in 9000 ppm NaF solution for 5 minutes. Moreover, diametral tensile strengths test of the specimens (6 mm dia.×3 mm thick) kept for 24h and 30 days in distilled water were undertaken in order to compare the strength of Fuji IX GP and Fuji II LC.
Results demonstrated that the glass ionomer cement-tooth junction was very tight showing no gap formation adjacent to the enamel and dentin, while a hybrid layer like structure about 1 um in thickness was observed at the superficial dentin on FujiFil LC. The highest fluoride ion release was shown after one day in all of the freshly-mixed specimens, and the release rates dropped quickly to become stabilized at 3 days. After 5-min exposure to a 9000 ppm NaF solution the initial fluoride ion release significantly increased for all materials. The highest rates were during the first day, but then dropped very quickly to become again stabilized in 3 days. The order of fluoride release and uptake for FujiFil LC was higher than those of Fuji II LC and a conventional glass-ionomer cement Fuji IX GP. In the tensile strength of tested specimens, there was no significant difference in diametral strengths between 24h and 30 days specimens for each material. FujiFil LC glass-ionomer cement can clinically achieve satisfying aesthetic dental restoration.View full abstractDownload PDF (2959K) -
Satoko Kobayasi, Shoji Tanaka, Yukio Murakami, Maki Minami, Seiichiro ...2007 Volume 45 Issue 1 Pages 88-91
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIt is well known that supernumerary teeth occur less frequently in primary dentition than in permanent dentition. Supernumerary tooth in the lateral incisor region of the maxilla is also rare. We encountered a case of supernumerary tooth in the lateral incisor region of the maxilla in primary dentition and mixed dentition in child.
Review of the literature regading primary supernumerary tooth and supernumerary tooth in the lateral incisor region of the maxilla was also made.View full abstractDownload PDF (3317K) -
Yasutaka Kaihara, Kozue Aoki, Nami Miyake, Katsuyuki Kozai2007 Volume 45 Issue 1 Pages 92-96
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSFor treatment of two cases of ectopic eruption of the mandibular right second molar and malposition of the mandibular left first bicuspid, we conducted MTM using a lingual arch, sectional wire and crimpable hook. The results showed the effectiveness of this as described below.
1. The treatment is a simple procedure involving the fitting of the lingual arch, then attaching a buccal tube or bracket to the tooth to be moved, and finally attaching the crimpable hook to the sectional wire.
2. Because the technique is simple, the procedure can be completed in a short time.
3. By attaching the crimpable hook, activation of the wire is easily done even at sites at the back of the dental arch where it is difficult to operate, such as between the mandibular first and second molars.
4. The period of treatment is comparatively short at 1 to 3 months.
5. The affected infants did not feel pain or discomfort during treatment.
6. Retrogression was not observed in either case.
This method is technically simple, places little burden on either the patient or the practirioner, and seems to be an extremely effective method with good outcome.View full abstractDownload PDF (2757K) -
Satomi Nishikawa, Keiko Harada, Yukari Shinonaga, Rie Niji, Kenji Arit ...2007 Volume 45 Issue 1 Pages 97-102
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSA nine-day-old female patient was referred to the Pediatric De ntistry Department for diagnosis and treatment of a mass, which was diagnosed clinically as a congenital epulis.
The mass arose from the right side incisor region on the alveolar ridge of the upper jaw. The mass was smooth and oval,12 mm being the greatest width,8.5 mm being the smallest width, and 7 mm was its height from her gingiva.
The mass was not su rgically treated, but was kept under observation, because the child and her mother experienced no trouble respiring and nursing. The mass enlarged and the greatest width became 16 mm at one-month of age. After that, however it decreased gradually and disappeared completely at six months of age. It has not recurred yet at twelve months of age. The time and location of eruption of her teeth were normal.
It was suggested that it was better not to perform resection soon after the diagnosis, but to keep it under observation as long as the child experiences no trouble in nursing. For the treatment for congenital epulis of the newborn, we should hope it will heal itself.View full abstractDownload PDF (1939K) -
Ayumi Sugimoto, Hiroko Kuboyama, Kyoko Ando, Itoko Takamura, Takahito ...2007 Volume 45 Issue 1 Pages 103-108
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSHypnic Myoclonia is a sudden muscle contraction which occurs at the transition from sleep to awakening and is observed in about 60-70% of people of all age groups. A case of a male infant who had repetitive bleeding and ulceration of the tongue following tongue biting due to Hypnic Myoclonia is reported. He began to experience myoclonus with a bite wound of the tongue and severe screaming when he was 10 months old. For palliative care, we smoothed the cutting edge of the maxillary-mandibular primary incisors and made an impression to produce a removable resin appliance to be applied while sleeping. Symptomatic improvement did not take place, and we asked a pediatrician of the university hospital in Fukuoka to examine the patient. The Results of the medical examinations showed no abnormality, and also no abnormality on the-electroencephalogram of the head, and magnetic resonance imaging. Hypnic Myoclonia with physiological abnormality was diagnosed. Irrigation, gargling with AZ fine granules and laser-treatment for the bleeding and ulceration region were undertaken. After we instructed the patient to cover the affected area with a towel while sleeping,5 months later the symptoms improved with decreased frequency of tongue biting, and this mostly disappeared at the age of 1 year and 8 months.
We considered this phenomenon to be an age-dependent phenomenon related to the maturation of the brain and to the development of the oral functions because it disappeared spontaneously at age of 1 year and 8 months.View full abstractDownload PDF (2972K) -
Ayako Banshodani, Yasutaka Kaihara, Hisami Nakae, Junji Suzuki, Katsuy ...2007 Volume 45 Issue 1 Pages 109-117
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSCleidocranial dysostosis (CCD) is a genetic bone development disorder which is characterized by incompletely formed collar bones, late closure of the sutures and the fontanels of the skull, delay ed eruption of the permanent teeth, and so on. We describe 10 years old fraternal twin sisters su ffering from cleidocranial dysplasia. They were referred to our hospital by their family dentist be cause of they had numerous impacted permanent teeth. Both of them presented typical characteristics of th is disease in the skull, the clavicles, and the maxillofacial area.
They had slopping shoulders, although they were not able to bring their shoulders together in front. They were in short posture and had an inverted pear-shaped skull and a saddle nose. Radiograph s revealed the partial absence of their clavicles, typical cranial abnormalities which were incomplete ly closure of the sutures and fontanels of the skull, and wormian bones. In both cases, mand ibular prognathism was characteristic. According to cephalometric x-ray analysis, hypergrowth of the mandi bular bone was obvious, but undergrowth of the maxilla was not noticeable.
Both of them had prolonged retention of the primary tee th and delayed eruption of the permanent teeth. The first sister had 35 impacted teeth including 9 supernumerary teeth in her jaws. T he second sister also had 34 impacted teeth including 8 supernumerary teeth. Their hard palates were hig h and narrow with a groove running down the center.View full abstractDownload PDF (5910K) -
Noriko Kadomoto, Junji Suzuki, Yoshiko Taniguchi, Meiko Kuramoto, Mits ...2007 Volume 45 Issue 1 Pages 118-124
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSGenerally, inverted and impacted teeth have not been considered for treatment but were extracted. Especially, inverted and impacted incisors having a bending root were very difficult to guide. In the present study, we report on 2 cases of occlusal guidance of inverted and impacted upper central incisors.
Case 1: A 9-year old male was referred by his family dentist complaining of delayed eruption of the upper left central incisor. The X-ray photo revealed that the upper left central incisor was impacted inversely. The incisor was successfully guided to the correct position with a fenestration operation and occlusal guidance for 3 years and 3 months using a lingual arch and multi-bracket system.
Case 2: An 11-year old female was referred with a complaint of delayed eruption of the upper left central incisor. It was revealed that the upper left central incisor was inverted and impacted radiographically. Furthermore, the root of the central incisor was obviously bent. It took 1 year and 11months to complete the occlusal guidance with same procedure as in case 1.
In both cases, prognoses remain satisfactory without clinical symptoms such as pain or periapical periodontitis.View full abstractDownload PDF (6083K) -
Meiko Kuramoto, Junji Suzuki, Satoko Otani, Noriko Kadomoto, Katsuyuki ...2007 Volume 45 Issue 1 Pages 125-133
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSWe encountered three cases of familial partial anodontia diagnosed as ectodermal dysplasia.
The results were as follows,
The proband was a 8-year-and-3-month old female. She was missing congenitally both deciduous teeth _??__??__??_ and the permanent teeth _??__??__??_. Her occlusion was an anterial cross bite, because her maxilla was relatively small compaired to her mandibular. A partial denture was used to improve mastication and for aesthetic purposes.
Her elder brother was 9 years and 7 months old. He was not missing congenitally deciduous teeth, but permanent teeth _??__??__??_. All of his deciduous teeth still remained. His occlusion was an edge-to-edge bite.
Their mother was 32 years and 11 months old. She was missing congenitally permanent teeth _??__??__??_, although congenitally missing deciduous teeth were not clearly revealed. Partial dentures and a bridge were used.
From the clinical findings together with the family history, we diagnosed that their partial anodontia was caused by ectodermal dysplasia that was transmitted in an autsomal recessive manner.View full abstractDownload PDF (5590K) -
2007 Volume 45 Issue 1 Pages 134-192
Published: March 25, 2007
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSDownload PDF (15310K)
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