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Volume 26 (1988)
- Issue 4 Pages 719-
- Issue 3 Pages 449-
- Issue 2 Pages 257-
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Volume 26, Issue 2
Displaying 1-13 of 13 articles from this issue
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Osamu Moriguchi1988 Volume 26 Issue 2 Pages 257-281
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of this investigation was to evaluate the morphological relationship between the axial tooth contour and the gingiva, in order to clarify the condition of deciduous restorations, cervical caries, and food flow during mastication. Materials: The subjects consisted of 227 deciduous anterior teeth taken from 88 plaster casts of 3 to 4 year old primary dentition with normal occlusion, caries-free, and with healthy periodontium. Methods: In the standard model, the mandibular occlusal plane was recorded to be the standard plane. Five measuring points were recorded on the tooth surface of these plaster casts; the mesioincisal angle of the crown, the central point between the mesioincisal angle and the central of the crown (the mesial point), the central point of the crown, the central point between the distoincisal angle and the central portion of the crown (distal point), the distoincisal angle of the crown. The labial contours of the crowns and their gingivae were enlarged twenty-times and traced with a contour measuring instrument. The relationship of these 2 contours were compared from the point of view of food flow mastication and were evaluated and measured according to the various categories mentioned above. Maxillary subjects were obtained by the same means as those from the mandibular region, and the same occlusal plane was set to be the standard plane. The standard axis was determined as a tangential line drawn from the crown and highest part of the gingival contour to the occlusal plane, and bringing this axis into contact with their contours this point being considered as the highest extruding point.View full abstractDownload PDF (6962K) -
Handicapped Children (2)Yuko Oba, Ayumi Nonaka, Chiemi Takebe, Nobuko Horiuchi, Yasuo Takeda1988 Volume 26 Issue 2 Pages 282-285
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe volition concerning tooth cleaning influences the effect on tooth brushing for children. This study was conducted to evaluate the relationship between the willingness and the effect of the tooth brushing, and as well as the effectiveness of the progressive method on the physically handicapped children. The progressive method with social reinforcements for the group instruction was once used in the Boy Scout League and is now employed for the education of handicapped children. The subjects were 50 physically handicapped children from 5 to 20 year of age: 37 with cerebral palsy (11 of the athetose type and 26 of the spastic type) and 13 with various other diseases. They were divided into the independent group of 26 patients acting on selfreliance and the dependent group of the 24 patients with nursing assistance. In the progressive method the official announcemence and the giving of medalls were taken as the social reinforcement and the reward. Before beginning the 3 months session, the plaque index (PIa)was checked and 10 cases with a good oral hygien condition were announced and after 3 months the plaque index (PIb) and the gingival index (GI) were checked.
The following results were obtained:
1) In the independent group, the average PI decreased remarkably from 0.79to 0.64 (p<0.01). The result proves that social reinforcement is a valiable method for the instruction of the tooth-brushing for the physically handicapped.
2) For both the dependent and the independent group, there were no remarkable differences concerning the GI.
3) There was no relationship between the types of cerebral palsy and the alteration of the average of PI.
4) PIb corelates with IQ and SQ (p<0.05). This suggests that the deterioration of adaptionability to social life trends to show a poor PI.View full abstractDownload PDF (761K) -
Yoshiaki Shimizu1988 Volume 26 Issue 2 Pages 286-305
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of this study was to clarify the facial features of Down's syndrome. The faces of 30 adults with Down's syndrome,30 normal individuals (consisting of 15 males and 15 females in each group) were analyzed using the Moire topography in three-dimensional measurements. I measured the facial surface area and volume to obtain all the features, and observed the mid-face in detail. Further, I investigated the facial features of Down's syndrome by using an index prepared from the pattern of the Moire topography.
The results were as follows:
1) From the results of the measurement of the facial surface area and volume, a difference in facial features was observed in the mid-face between those with Down's syndrome and normal individuals. The development of the midface with those with Down's syndrome was significantly less, and its form was flatter in patients with Down's syndrome than in the controls.
2) The mean value of the distance between the left and right canthus was 35.03mm in the control and 33.82 mm in patients with Down's syndrome, so, the hypertelorism in patients with Down's syndrome was negligible. The length of the nose was an important factor in explaining an apparent hypertelorism in Down's syndrome from the result of the MDBI value.
3) The development of the nose was significantly less in patients with Down's syndrome than in the controls. The volume of the nose in patients with Down's syndrome was 75% of that in the controls from the result of MDNI value.
4) The development of the part proportionate to the maxilla was significantly less in patients with Down's syndrome than in the controls. The growth quantity of the part proportionate to the maxilla in patients with Down's syndrome was 80% of that in the controls from the result of MDMI values.
5) The oblique palpebral fissure accounted for 6.67% in control and 30.00%in patients with Down's syndrome.
6) The epicanthic fold accounted for 30.00% in control and 70.00% in patients with Down's syndrome.View full abstractDownload PDF (9538K) -
(I) Influence of Cleaning and Polishing PretreatmentsYumiko Hosoya, George Goto1988 Volume 26 Issue 2 Pages 306-316
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of this study was to investigate the influence of cleaning and polishing pretreatments for the effect of acid etching on the primary enamel smooth surfaces.
Fifty-nine labial surfaces of the extracted or exfoliated caries-free primary anterior teeth were used.
The cleaning and polishing pretreatments used in this study were: application of 10 % NaOCl, polished with a brush cone (Hawe-Neos-Dental Co. ) or a polishing brush (Sato Dental Material Co. ) at a low speed (600-6000 r. p. m. ), polishing with a brush cone and various polishing pastes, cleaning with an air polisher Prophy-Jet (Dentsply Co. ) or Quick-Jet (Dentscraft Co. ) with NaHCO3powder and water. The polishing pastes used in this study were Neo-Polishing-Paste (Neo Dental Chemical Products Co. ), pumice slurry (Tokyo Dental College prescription), tooth paste (Lion Co. ) and CCS Prophy-Pastes (Inoue Marketing Co. )Etchant used in this study was 40 % phosphoric acid gel, and after one minute etching, all specimens were washed with an air water spray for 30 seconds.
The following observations were obtained using the SEM.
1. Tooth to tooth difference of the etching effects and patterns was observed under the same cleaning and polishing methods.
2. Various etching effects and patterns on the same enamel surface were observed.
3. The most common etching patterns were poorly structured etching patterns (84.7%) and peripheral etching patterns (81.4%).
4. It was likely that materials such as organic films and cuticles would remain on the etched enamel pretreated with the low efficacy polishing and cleaning methods.
5. However it was considered that tooth to tooth difference influenced the etching effects more than the cleaning and polishing pretereatments.View full abstractDownload PDF (11359K) -
(II) Influence of Etching TimesYumiko Hosoya, George Goto1988 Volume 26 Issue 2 Pages 317-327
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of this study was to investigate the influence of etching times for the effect of acid etching on the primary enamel smooth surfaces.
Eighty-two labial surfaces of the extracted or exfoliated caries-free primary anterior teeth were used. The cleaning and polishing pretreatments used in this study were: application of 10% NaOCl (Neo Dental Chemical Products Co. ), polishing with a brush cone (Hawe-Neos-Dental Co. ), polishing with a brush cone and tooth paste (Lion Co. ), Neo-Polishing-Paste (Neo Dental Chemical Products Co. ) and pumice slurry (Tokyo Dental College prescription).
Etchant used in this study was 40% phosphoric acid gel and the etching times were 10,30 and 60 seconds. All specimens were washed with an air water spray for 30 seconds after etching.
The following observations were obtained using the SEM.
1. The shorter the etching time, the higher was the rate of the cases which did not show any prism structure.
2. The numbers of the cases which did not show any prism structure were: 2(8.3%) out of the 24 in 60 seconds etching,5 (16.7%) out of the 30 in 30 seconds etching and 8 (38.6%) out of the 28 in 10 seconds etching.
3. Especially in the cases pretreated with the 10% NaOCl solution and Neo Polishing Paste, the rate of the cases which did not show any prism structure increased with the shorter etching time.
4. The shorter the etching time, the lower was the rate of the cases which showed peripheral etching patterns, core etching patterns and peripheral and core etching patterns.
5. However, the rate of the cases which showed poorly structured etching patterns was high in all etching time.
6. In the etching times used in this study,60 seconds is an adequate time for etching on the unground primary enamel smooth surfaces.View full abstractDownload PDF (10943K) -
Part 1: Bending and Tensile TestMototaka Imamura, Hiroyo Nagato, Eiichi Aida, Taeko Adachi, Hiroshige ...1988 Volume 26 Issue 2 Pages 328-335
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSSelf-cure polymethylmetacrylate resin is used for space retainers and many other orthodontic appliances. As these appliances are used with children or adolescents, breakage of resin often occurs. Self-cure resin can be reinforced against breakage by the addition of glass fiber (G. F. R. P.: glass fiber reinforced plastic). In order to evaluate the efficiency of reinforcement, bending properties ( JIS T6501) and tensile properties ( JIS K7113) were examined with a single material of commercially available self-cure resin and other of various kinds of reinforcement materials.
In the bending evaluation. self-cure resin without glass fiber did not satisfy with the Japanese Industrial Standard ( JIS T6501), while some of the G. F. R. P. satisfied with the Standard. In the tensile evaluation of G. F. R. P., the strength of destruction increased, the stretch of destruction decreased, the modulus of elasticity increased, and the strength of the yield point increased, when compared with self-cure resin without glass fiber.View full abstractDownload PDF (1472K) -
Takasaburo Yoshiyasu1988 Volume 26 Issue 2 Pages 336-359
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of the present study was to evaluate the functional disturbances of chewing found in the cerebral palsy patients. Twenty cerebral palsy children (C. P. group) were the subjects in the present study and were compared with normal children (control group), none of whom had any occlusal disturbances.
The evaluation of the functional disturbances was made by examining the EMG of masticatory muscles such as the temporal anterior muscles and the masseter muscles on both side. Then the EMG was recorded when the child was asked to practice free tapping (76 times/min. ) and to chew kamaboko (fish cake)and chewing gum.
From the results obtained in the present study it was found that a different variety of occlusal dysfunction was noticed in the cerebral palsy children, and the author made a classification of four different grades of occlusal dysfunction based on severity. This classification may be considered to be helpful for the evaluation of improvement after occlusal functional training is achived for the C. P. patients.View full abstractDownload PDF (8937K) -
Biochemical and Histological Responses of Rats to Those CementsTsutomu Ootsuchi, Masami Rakugi, Takashi Komura, Shizuo Sobue1988 Volume 26 Issue 2 Pages 360-370
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSCement cylinders were prepared by mixing tetracalcium phosphate or α-tricalcium phospate powder with citric acid or malic acid, and then implanted subcutaneously in the rats. Systemic and local responces of the rats to these newly developed cements were examined biochemically and histologically. The cements were also analyzed according to their morphological and chemical changes in the rat tissue.
The results were as follows:
1. There was no diffrence in body weight during the experimental period between rats receiving the cement implantation and not being implanted. Twelve weeks after the implantation, the systemic effects of the cements were studied by hematologic or biochemical examination of the blood and histological study of liver, kidney and spleen. Since these studies of the test animals showed essentially the same findings as the control, it was considered that implantation of these cements had evoked little systemic adverse effects in the rats.
2. Histopathological examinations of the rat tissue surrounding the cement cylinder showed that inflamatory cells had infiltrated into the tissue in contact with the cement made from α-tricalcium phospate and malic acid. However, in the case of the other cements tested, similar histological findings of the tissue affinity were obtained to those seen in the hydroxyapatite cylinder.
3. During whole experimental period, there was no change in the shape or radiopacity of the cement cylinders. It was shown by X-ray diffraction analysis that a larger part of α-tricalcium phospate had converted to hydroxyapatite and a small amount of α-tricalcium phospate still remained after the experimental period of 12 weeks. On the other hand, it was found that tetracalcium phospate cement had converted completely to hydroxyapatite in the same period.View full abstractDownload PDF (9671K) -
Keiji Shinoda1988 Volume 26 Issue 2 Pages 371-390
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of this study is to examine the mandibular movement during gum chewing of the children with deciduous dentition and to compare with those of adults, and also to analyze the influences of malocclusion on the masticatory movement of children.
The subjects were devided into three groups, based on the types of dentition, i) 10 children; mean age 4y7m with deciduous dentition (designated as d. d. ), ii) 10 children; mean age 8y4m with mixed dentition (designated as m. d. ) and iii) 10 adults; mean age 21y6m with permanent dentition (designated as p. d. ). In addition 20 subjects having malocclusion cross-bite; mean age 6y11m m and progenie; mean age 7y2m during mixed dentition. The mandibular movemenets was recorded with Saphon Visi-Trainer C II during gum chewing and the traces of mandibular movement recorded on the frontal plane were analyzed.
The results obtained in the present study are summarized as follows,
1) The chewing pattern of children with d. d. was characterized by large lateral deviation to working side and narrow width of opening and closing pathway. During growth, the lateral deviation of both the maximum opening position and the maximum lateral position of the mandibule is decreased, and the width of the opening and closing pathway is incresed. The type of chewing for children with d. d. was characterized by chopping, while the children with m. d. and adults was characterized by grinding.
2) The chewing pattren of the children with malocclusion was generally characterized by a midsagittal opening and closing pathway, and a narrow width of the opening and closing pathway. The children with cross-bite represent chopping type predominantly.
As far as the results of the present study is concerned, the alteration of chewing following the dentitional growth could be suggested. In addition, malocclusion such as crossbite or progenie observed in the children may affect the chewing pattern. The proposed method in the present study is considered to be appropriate to evaluate the mandibular movement in children.View full abstractDownload PDF (7150K) -
Keiko Takita, Michiko Shimohida, Tetsuro Ogata, Yoshihiko Hamano, Mino ...1988 Volume 26 Issue 2 Pages 391-398
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSVaries kinds of conditional factors have been found to influence the electrical impedance between the tooth cavity and the oral mucous membrane. In this experiment the two kinds of conducting media (the physiological saline and the tooth paste) and the three types of electrodes (uncovered sharp point, covered sharp point and covered flat point) were tested with the artificial cavities of the extracted primary anterior teeth.
The findings obtained were as follows:
1) There was no significant variability concerning the reproducibility ascertained from the repeated measurement.
2) A significant difference was obtained only with the deepest cavities (lower than 50 k ohm) for both the factors of the inducting media and the electrode. The physiological saline showed a higher value than the tooth paste and the covered flat point, uncovered sharp point and covered sharp point showed, in ascending order, higher impedance value.View full abstractDownload PDF (6596K) -
Dental findingsYuichiro Ito, Zweih-Eng Tu, Machiko Tonouchi, Rong-Shen Liu, Naoko Mor ...1988 Volume 26 Issue 2 Pages 399-405
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe characteristics of the Alagille syndrome are a specific facial appearance, a mesosystolic murmur, vertebral arch defects, growth retardation, mcntal retardation and hypogonadism in addition to hepatic ductular hypoplasia. A case of a 12-year-old girl who was diagnosed to have the typical symptoms associated with the Alagille syndrome is described in the present report.
The following are the dental findings pertinent to this case.
1. Severe and multiple caries were observed.
2. The cephalometric analysis showed that both the maxilla and mandible, were less developed.
3. Brown-yellow discoloration of teeth was noticed on all teeth.View full abstractDownload PDF (9528K) -
Youko Monma, Hideaki Mayanagi1988 Volume 26 Issue 2 Pages 406-414
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSA 4-year-old Japanese girl was referred to the Pedodontic Clinic of the Tohoku University Dental Hospital for treatment of a completely impacted second deciduous molar and gingival swelling at the site of the tooth.
Oral examination showed that all deciduous teeth except the lower left second deciduous molar had erupted, and all of them were carious. Examination of the lower left second deciduous molar by X-ray photographs revealed that the tooth was completely impacted and had a radiolucent caries-like lesion in the mesial half of the occlusal surface. It was also shown that the tooth germ of the lower left second premolar, which was a successor to the impacted tooth, was located between the impacted tooth and the first molar.
The impacted tooth was extracted, and was shown to have gross caries as indicated by the X-ray photographs. Due to the mesially inclined eruption of the lower left first molar, the space for the second premolar was lost. To regain the space, the first molar was moved to the distal by using a bilatelal splitbasetype space regainer.
The pathological factor(s) for the tooth impaction was not determined. Development of the caries of the impacted tooth may have been due to the bacterial invasion from the periodontal pocket. It is probable that the impacted tooth caused an abnormality in the location of the tooth germ of the second premolar.View full abstractDownload PDF (18042K) -
Kouzi Nabeshima, Takayoshi Ishikawa, Kazuo Miura, Nobuo Nagasaka1988 Volume 26 Issue 2 Pages 415-422
Published: June 25, 1988
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSCongenital microglossia is very rare disorder. We found a case of congenital microglossia in a 8 year 5 month old boy and the following findings were obtained.
1) An evaluation revealed microglossia, maxilla and mandibular hypognathia, partial anodontia of the permanent teeth, a high arched palate and a submucous cleft palate. There was also a history of congenital ventricular septa' defects.
2) The position of the tongue and the lingual root were normal but lingual apex was sharp and small.
3) He seemed to be able to speak well, appeared intelligent and could distinguish various kinds of tastes.
4) It may be considered that the microglossia was caused by intrauterine infection with the rubella virus during the second month of gestation.View full abstractDownload PDF (10365K)
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