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Volume 22 (1984)
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Volume 22, Issue 3
Displaying 1-13 of 13 articles from this issue
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George Goto1984 Volume 22 Issue 3 Pages 619-623
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe adhesive bridge has many advantages and is considered suitable for the replacement of missing anterior teeth in the adolescent patient.
The purpose of this study was to investigate the metal surface conditioning to improve the adhesive strength for the lingual plate of the adhesive bridge.
The surfaces of nickel-chrome nonpresious ceramic alloy “Cyclon G” (Nihon Shiken Co. ) were polished with #220 Emery paper. Six specimens were sandblasted, using 25 micron alminium oxide perticle. Sixty cases were etched from 5 minutes to 60 minutes, using 60% nitric acid,36% hydrochloric acid,60% sulfuric acid and aqua regia. These specimens were washed and dried, then observed through a scanning electron microscope.
The sandblasted metal surfaces showed minute irregularity and scarcely any undercuts. The surfaces processed using nitric acid, hydrochloric acid and sulfuric acid did not show any obvious change, while the surfaces processed using aqua regia showed obvious irregularity and undercuts which are useful for retention of the lingual plate of the adhesive bridge.View full abstractDownload PDF (7010K) -
The Examination of Out-Patients During Past 8 YearsYoshiaki Hashimoto, Fumihiko Hino, Masaaki Ishikawa1984 Volume 22 Issue 3 Pages 624-630
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSWe conducted an investigation of cases of supernumerary teeth in the upper incisor region. The investigation was based on the examination of the out-patients who had visited the Pedodontic-clinic of Tokyo Medical and Dental University during past 8 years. The subjects consisted of 403 boys and 138 girls. The results were summarized as follows:
1. In most cases, the presence of supernumerary teeth had been found in children from 6-8 years of age.
2. About 65% of the cases had one supernumerary teeth, and 34% of the cases had two supernumerary teeth. Moreover, with boys, a few cases had three or four supernumerary teeth.
3. Upon examination of X-rays, with respect to the direction of the crown,52.8%of the supernumerary teeth were normal,44.4% were inverted and 2.9% were horizontal.
4. On examination of the dental plasters, it was found that the mesiodistal crown diameter of each tooth was not significantly different from that of the normal occlusion.
5. In cases in early mixed dentition, the bicanine width was found to be larger than that of the normal occlusion, and it was suggested that the anterior arch form was larger than the normal one.View full abstractDownload PDF (1315K) -
The Position of Supernumerary Teeth and Their Influences on the Permanent Central IncisorsMasaaki Ishikawa, Fumihiko Hino, Yoshiaki Hashimoto1984 Volume 22 Issue 3 Pages 631-641
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIt is important to know the influences of the supernumerary teeth in the upper incisor region on the arch form and occlusion. If we use some materials independently such as X-ray films or dental casts, it is not so easy to analyse their influences precisely. Therefore we devised a new method to observe such cases three-dimensionally, applying Ishikawa's method (1977) in which one could calculate three-dimensional coordinates of the anatomical landmarks that were able to be traced in the lateral and frontal cephalograms simultaneously.
61 cases which had supernumerary teeth and were in the stage after the eruption of the lateral incisor were investigated, the mean age being 9 years and 1 month. We drew tripartite diagrams of all cases using three-dimensional coordinates of the measuring points and examined the interrelation between the central incisors and the supernumerary teeth. Of all the tripartite diagrmas, we superimposed some of the supernumerary teeth which were shown by arrows according to their number and crown direction, and measured the angles between supernumerary teeth and palatal plane.
The results are as follows.
1. The tripartite diagram expressed by the three views such as lateral, frontal and occlusal makes it possible to evaluate three-dimensionally the precise position of the supernumerary teeth in the upper jaw and relationship to central incisors, especially in case of their maleruption.
2. As to the distribution area of the supernumerary teeth, there was some difference according to the types.
3. The degrees of the crown direction of the supernumerary teeth were distributed gently sloping and continuously. In the lateral view, noninverted types were a little more right-angled than the inverted types.
4. In cases of delayed eruption of the central incisors, the tripartite diagrams suggested that the supernumerary teeth were just under or around the path of incisor's eruption, and it seems to be one of the main reasons that supernumerary teeth should be removed at an early stage.View full abstractDownload PDF (3537K) -
Fabrication of the Apparatus and the Evaluation of its AccuracyEiichi Aida, Mototaka Imamura, Mamoru Adachi, Kumi Nishibori, Hiroyo K ...1984 Volume 22 Issue 3 Pages 642-650
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIn order to solve one of the problems occurring at the time of the exchange of the primary tooth and the permanent successor, a series of studies was conducted to show how the periapical lesion influenced the tooth germ and the resorption of the primary tooth, using dogs as subjects.
The radiographic apparatus for these specific studies should be objective and accurated. For this purpose a new radiographic apparatus was fabricated, and the standardization of the apparatus and the accuracy of a newly designed measurement were evaluated.
The results are as follows:
1) The standard errors of the value of the measurement were 0.00-0.01mm, which was evaluated to be minimum.
2) The standard errors of the value of the tracing were 0.01-0.04mm.
3) The standard errors of the value of the standardization were 0.01-0.05mm, which indicated that the apparatus was accurate.
4) The greater part of the discordance of 4the standardization occurred when tracing. Double or tripple trial of tracing was needed for accurate measurement with this apparatus. The results led to the conclusion that this radiographic apparatus was appropriate for various studies using the mandible of dogs.View full abstractDownload PDF (5456K) -
Part 2. The Process of Eruption and the Hypoplasia of the Permanent ToothKumi Nishibori, Mototaka Imamura, Mamoru Adachi, Eiichi Aida, Kazuo Ku ...1984 Volume 22 Issue 3 Pages 651-660
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIn order to clarify the relationship between the periapical inflammation of the deciduous tooth and the permanent tooth germ,74 cases (ranging from 3-9 years of age) that had periapical radiolucency of the mandibular deciduous molar on one side and did not have caries on the other side of the same dentition, were investigated and reportec in a previous paper, Part I. In 28 cases that were followed up over a period of from one to nine years, the developmental stages, the timing of eruption and the enamel hyopplasia of the permanent teeth were observed.
The results are as follows.
1) The following was found in the cases with extraction of the infected deciduous teeth.
(i) The periapical inflammation of deciduous teeth with or without the avoidance phenomenon of the tooth germ of the permanent successors did not influence the eruption of the permanent teeth.
(ii) There was a tendency that the permanent successor where the deciduous tooth was extracted erupted earier than the control tooth when the eruption space was sufficient.
(iii) In 12 of 19 teeth, the speed of development of the tooth germ of the permanent successor where the deciduous tooth was extracted was as fast as that of the permanent control tooth even after extraction. However, the development of the permanent successor under the infected deciduous tooth was advanced with 5 of the teeth, and delayed with 2 of the teeth.
2) In three of the six cases that could be followed up by the time of eruption of both sides of the permanent teeth, the infected side and the control, the enamel hypolasia of the permanent successor resulted from the periapical lesion of the deciduous tooth. The enamel hypolpasia was found on the cervical portion of the buccal surface, and buccal and lingual cusps. Brown stain was found in one tooth.View full abstractDownload PDF (1897K) -
Yoshihiro Tachikawa, Yuzo Ide, Keiko Taikita, Yoshihiko Hamano, Minoru ...1984 Volume 22 Issue 3 Pages 661-666
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSElectrical resistance was measured on 74 primary teeth in children from the ages of two to ten and the appropriate endodontic treatment was selected in accordance with the range of the measured values. The association between the selection of the method of treatment and the range of the electrical resistance of the remaining tooth substances at the removal of affected dentin was originally set up by Suzuki et al. (1978) and modified by Hayashi et al. (1982).
The results of the three-year prognosis of the above clinical applications were as follows:
1)Seventy cases (95%) showed the satisfactory prognosis and 4 cases (5%)showed poor results.
2)By measuring the electrical resistance changes, the overlooking of invisible pulp exposure was avoided and the existence of the remaining sound dentine layer was clearly measured. Furthermore, it was supposed that the extent of pathological changes in the pulp might be predicted by the evaluation of electrical resistance changes after the removal of the soft dentine.
3)The use of electrical resistance in the diagnosis for the carious region of the primary tooth proved to be a very effective supplementary method for the objective diagnosis in pedodontic clinic.View full abstractDownload PDF (3128K) -
Tetsuo Namba, Harunobu Tanakamaru, Hiroko Takano, Yukio Machida1984 Volume 22 Issue 3 Pages 667-673
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe purpose of this study was to observe the growth and development of the palatal ruga longitudinally in children.
140 dental casts were obtained from 20 children,10 boys and 10 girls, with normal occlusion. Impressions were taken at one year interval from 4 years of age to 10 years of age.
The outline of the primary ruga and all teeth from the occlusal views of the casts were traced using five magnification by Nikon V16A profile projector, and were measured and analysed by computor.
The results were as follows:
1. The distance between two points on the ruga.
1) The distance between terminations of the right and left ruga increased noticeably (1.6-2.3 mm). The more anterior the position of ruga, the more the increase was influenced by the emergence of permanent central and lateral incisors.
2) The length of each left ruga increased longitudinally (0.6-1.2 mm), as the distance between the termination of the right and left ruga but the not so evident.
3)The distance between the origins and between the terminations of each left ruga increase gradually (0.3-0.9 mm), therefore each ruga separated longitudinally.
2. The distance between ruga and reference line.
1) The distance between the first ruga and the distal line of the deciduous canine decreased about 0.7-1.2 mm from 4 years of age to 7-8 years of age, and then increased about 0.4-0.7 mm. With the ruga as a point of reference, it seemed that the deciduous canine moved mesially and distally.
2) The distance between the third ruga and the distal line of the deciduous second moler decreased about 2.1-2.4 mm from 4 years of age to 8 years of age, and then revealed almost no change.View full abstractDownload PDF (1211K) -
Satoshi Sakurai, Koei Igarashi, Keiko Chiba, Kikuo Kamiyama1984 Volume 22 Issue 3 Pages 674-691
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSIt is important to understand the oral conditions in cerebral-palsied children in order to perform dental treatment. The purpose of this survey was to determine the prevalence of dental disease in cerebral-palsied children. Examination records were made of 811 cerebral-palsied children aged one to fifteen years of age.
The results were as follows:
1) The incidence of dental caries in cerebral-palsied children was lower than that of nomal children both for primary and permanent teeth. The rate of restorative primaly teeth was higher in the CP children than in the nomal children, but that of the permanent teeth was lower. The severely physical handicapped children and the children with a low IQ had a low caries incidence and a low rate of restorative teeth.
2) The incidence of gingivitis in the CP children was high. The severely physical handicapped children and the children with a low IQ had a high incidence of gingivitis.
3) Many of the CP children had attrition of posterior teeth. Dental attrition was more frequently in the atetoid type than in the spastic type of CP children.
4) Malocculusion of the anterior dentition was observed in many CP children, especially high was the percentage of open bite and maxillary protrusion.
5) The percentage of crowding in the dentition increased as the children grew older.View full abstractDownload PDF (3254K) -
Report of 3 CasesMuneshige Sekiguchi, Michiko Kamiura, Mitsuo Iinuma, Kimihito Ito, Hir ...1984 Volume 22 Issue 3 Pages 692-697
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSLidocaine hydrochloride (Xylocaine(R))h as been widely used and is considered to be a relatively safe anesthetic by the dental profession.
It has been previously reported, however, that Xylocaine(R)m ay be hazardous when used excessively, and unfavorable reaction such as subcutaneous bleeding may occur following mandibular block anesthesia.
However, the hypersensitivity which may have be caused by lidocaine (Xylocaine®) is discussed in the present paper. The cases were a 4.8 years old boy and 4.0 and 7.2 years old girl patients who has vistied the Pedodontic Clinic, Gifu College of Dentistry.
The skin reactions appeared from 6 to 24 hours after injection as erosive lesions 2.0 to 2.5 cm diameter in size.
The ulcered lesion was crusted from the margin to the center and the lesion healed completely in 2 to 3 weeks.
It may be presumed that these adverse Xylocaine(R) Arthus-like reactions, though it was not verified by intracutanious skin testing, may be caused by the preservatives and additives added in the anesthetics.View full abstractDownload PDF (6887K) -
Roentgenographic Findings of a CaseChieko Uehara, Kimie Tonouchi, Tadashi Noda, Masahiro Fukushima1984 Volume 22 Issue 3 Pages 698-705
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSWe followed-up roentgenographically the growth of a compund odontoma for a peariod of 1 year 8 months.
The patient was a 6-year-old boy at the first visit. At this time, the lower permanent central incisors and left lateral incisor had erupted, but the right deciduous lateral incisor remained. X-ray examination revealed that the root resorption of the right deciduous lateral incisor was not evident, and the lower right permanent lateral incisor was impacted.
The right lower deciduous lateral incisor was extracted, and we followed-up roentgenographically the eruption condition of the impacted tooth.
8 months after the extraction the roentgenogram showed a radioopaque mass above the impacted tooth. The radioopacity and the size of the mass had increased during the 8 months. A clinical diagnosis of odontoma was made, and its removal was performed. The removed masses were two round calcified particles.
Microscopically, the masses consisted of young enamel, dentin and pulp, but root and cementum were not formed. A diagnosis of compound odontoma was made based on the histopathological examination.
The cause for this odontoma was the dental sac of the impacted right lateral incisor.
The right lateral incisor was prevented from erupting by the odontoma. The impacted tooth took almost 1 year to erupt after extirpation of the odontoma.View full abstractDownload PDF (2450K) -
Toshiko Uji, Toshihiko Naruse, Minoru Nakata1984 Volume 22 Issue 3 Pages 706-711
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSThe Mixed Dentition Analyzer was invented to perform the space analysis of mixed dentition. It was computerized to utilize the regression equation by Ono (1960) andMoyers' probability at the 75% level for estimating the size of the unerupted cuspids and bicuspids.
In this paper, we described the operational procedure of this equipment, and then evaluated the measurement error between this method with the Mixed Dentition Analyzer and the conventional method with the mannual caliper.
The result was that the values estimated between both methods were nearly similar each other.The greatest advantage of this method might be that it spares the time required to perform space analysis. The application of the Mixed Dentition Analyzer appears to be practical for clinical use.View full abstractDownload PDF (6016K) -
Yasunori Takeda, Chikako Yahata1984 Volume 22 Issue 3 Pages 712-715
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSMany cases of sialolith and sialolithiasis have been reported in the literature, and several hypotheses on the formation of sialolith have been claimed, such as the inflammatory theory, the microbiologic theory, the foreign body theory, etc.. We encountered recently an interesting case of a sialolith suggesting foreign body theory of sialolity-formation.
A 13-year-old girl was referred to the dental hospital of our university with a complaint of swelling of her right submandibular region accompanied by pain. Radiographic examination revealed a wiry and metal-like radio-opaque substance in the right submandibular region. The patient had a history of ranula, and during surgical treatment of this condition, salivary sound had broken into a few fragments when salivary sound was inserted into the Wharton's duct. A clinical diagnosis of chronic sialadenitis of the right submandibular gland due to a foreign body was made and extirpation of the right submandibular gland was performed.
In the Wharton's duct, a club-like-shaped sialolith which was 13×4 mm in size and whitish-yellow in color was found.
Furthermorte, a wiry metal was seen in the center of this sialolith. Examination of soft X-ray showed calcareous deposition around the wiry metal. Therefore, it was thought that the sialolith in our case was formed by residual wiry metal as a foreign body.View full abstractDownload PDF (3539K) -
1984 Volume 22 Issue 3 Pages 719-796
Published: September 25, 1984
Released on J-STAGE: January 18, 2013
JOURNAL FREE ACCESSDownload PDF (18251K)
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