Nihon Hotetsu Shika Gakkai Zasshi
Online ISSN : 1883-177X
Print ISSN : 0389-5386
ISSN-L : 0389-5386
Volume 30, Issue 1
Displaying 1-22 of 22 articles from this issue
  • Part 1. A Comparison of Burnout Temparature
    Shigeyuki Kida, Takashi Komatsu, Hitoshi Ito, Kunihiko Sakaguchi
    1986 Volume 30 Issue 1 Pages 1-11
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    There are many problems centered around the use of Ni-Cr alloy, fitting, casting flow and casting shrinkage to name but a few are areas that must be deal with. Ni-Cr alloy does possess some very good physical and mechanical qualities, specifically; an ability to withstand wearing, hardness, heat conductivity, specific gravity plus many other points.
    The object of this study is to explore the many positive points of Ni-Cr alloy.
    Three kinds of investments and alloys were used in this study. And 5 temperatures were used as a base to determine the better burn out temperature of the wax patterns, 500, 600, 700, 800 and 900°C.
    The difference of fitting conditions, casting shrinkage and roughness on the surface was measured.
    Conclusion:
    1. At all temperatures, the casted alloy only expanded, no shrinkage occured.
    2. Fitting conditions corresponded proportionally to the size of the metal mold, the larger the mold the better the fit.
    3. The texture of Fitlloy 50 type II was found to be finer than that of Summalloy Soft and Summalloy Regular casted alloy.
    In addition, the casted alloy which was buried in Crown-vest was rougher than either Ceravest and Summa-vest.
    4. In addition, it was found that the finer the texture the better the fit.
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  • Analysis by Functional Evaluation Method
    Toshihiro Hirai, Naoya Matai, Takashi Anzai, Jun Nakazawa, Masanori Na ...
    1986 Volume 30 Issue 1 Pages 12-19
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    Masticatory rhythms of complete denture wearer were examined on electromyograph (EMG) and mandibular kinesiograph (MKG). We developed a method for the analysis of EMG and MKG recordings. By this method it is possible to express the whole masticatory movement, namely from the beginning to the last chewing cycle, by two parameters, “r” and “E”. Parameter “r” is correlation coefficient between the stroke number and the burst duration time of EMG recording divided by mandibular movement phase in one chewing cycle, through the whole mastication. Parameter “E” is a deviation from the regression line of the variables above mentioned.
    The purposes of this study are as follows; 1) to establish the standard range of “r” and “E” in complete denture wearer and 2) to observe the changes of “r” and “E” in the experimental subject group, from the time of insertion of the new denture, to the end of their adjustment period in complete denture wearer.
    The result was that the parameter “r” and “E” in each subjects came within the standard range after several adjustments of newly inserted denture in the experimental group.
    This finding suggests that this masticatory analyzing method is very useful in evaluating the effect of prosthetic treatment.
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  • Part 2. Effect of Cr Concentration of the Alloys
    Toshiyuki Yanagihara, Keio Nakamura, Naofumi Shigeto, Taizo Hamada
    1986 Volume 30 Issue 1 Pages 20-26
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    In case of soldered crowns and bridges made of Ni-Cr dental casting alloy, contact corrosion possibly occurs in oral environment. Generally, corrosion resistance of Ni-Cr alloy is related to content of chromium, but there are few reports about contact corrosion between Ni-Cr alloy and solder. Thus authers investigated about relation between contact corrosion and content of chromium in Ni-Cr alloys.
    In this study, six kinds of Ni-Cr dental casting alloys were selected, these contents of chromium were different. Galvanic cells were constituted with combination of Ni-Cr alloys and gold solder or silver solder in saline solution, and galvanic currents were recorded continuously for a week. Then amounts of Ni and Cu dissolved in saline solution were measured after four months.
    Results
    1. Ni-Cr dental casting alloys with less than 19% content of chromium became anode either in combination with gold solder or silver solder. And these Ni-Cr alloys were promoted to corrode by contact with solders.
    2. Pitting was observed on surfaces of Ni-Cr alloys corroded.
    3. Ni-Cr alloys with more than 22% content of chromium did not corrode in this experimental environment.
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  • Hiroshi Shimizu, Akio Takagi, Shigeki Moriguchi, Takuo Tanaka, Mitsuru ...
    1986 Volume 30 Issue 1 Pages 27-31
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    A number of reports on the acid-etched fixed partial dentures have been made. How to prevent the falling of retainers from the abutment teeth has been one of the unresolved problem. H. miyairi et al. suggested that the adhesive strength between retainers and acid-etched abutment teeth might been significantly influenced by the rigidity of the metal framework.
    The purpose of this study is to evaluate the influence of retainer's thickness on the adhesive strength of acid-etched fixed partial denture. The wax frameworks of various thickness were cast in cobalt-chromium alloy and Au-Ag-Pd alloy respectively.
    The following conclusions were obtained.
    1) The adhesive strength between the retainer and the bovine tooth increased according as the retainer's thickness increased, and reached the maximum and plateau with the thickness of 1.5mm.
    2) In case of using Super-Bond C & B, the adhesive strength of Au-Ag-Pd alloy to the teeth was better than that of Co-Cr alloy with the thickness of less than 1.2mm.
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  • Yoshinobu Tanaka, Ikumi Shiozawa, Yasuo Kishimoto, Kenji Tanaka, Taizo ...
    1986 Volume 30 Issue 1 Pages 32-44
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    Impression materials or cement should be delivered smoothly into the prepared root canals. A spiral instrument, made for endodontic treatment, has been traditionally used for this purpose.
    This report deals with the efficiency of this conventional instrument in comparison with the “Screw Bur” which we have developed for prosthodontic procedures. A translucent acrylic model was used so that the materials in the canal could be directly observed. The movement of the materials-polysulfide rubber and silicone rubber impression materials and zinphosphate cement-was taken on 8 mm film for analysis.
    The results may be summarized as follows:
    1. Impression material and cement were delivered into the canal more rapidly when the diameter of the spiral instrument was bigger.
    2. It took longer than expected to fill the canal with materials using the conventional instrument. It was too thin for prosthodontic use.
    3. High velocity rotation of the instrument delivered materials more efficiently into the canal.
    4. The new instrument “Screw Bur”, with a thicker diameter of 0.9mm, shortened delivery time required by the conventional instrument by 1/5 to 1/7.
    5. Clinical trial use has confirmed that “Screw Bur” is effective, safe and reliable for taking impressions and when setting post crowns or cast cores onto teeth.
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  • Research of Movements during Ingest-Inclination of Frankfort Line of Profile (3rd Report)
    Naoki Omiya, Katsuhiko Satoh, Noriyuki Waguri, Mitsuo Ikeda, Yasuhiko ...
    1986 Volume 30 Issue 1 Pages 45-64
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    We have one of importance research about jaw position and occlusal angle of elevation during mastication that is giving effect to mastication movement route. Regarding hwit these facts we have now proceeded our basic research and we have already reported that the inclinations of Frankfort-line and occlusal plane in case of having a “beef steak” and “chirashi zushi”. In this 3rd researchs, we report the result of research inclination about real Japanese food “Noodle with soup”. And furthermore we state the comparison with result of research three kind foods.
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  • Atsushi Uemura, Akiyoshi Shinya, Shigeo Yokozuka
    1986 Volume 30 Issue 1 Pages 65-80
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    We measured Tensile Strength and Vickers Hardness with using testpieces casted Ni-Cr Alloys by melting cast technic (high frequency melting in the argon atmosphere, atmospheric high frequency melting, melting by blowpipe with natural gas and oxygen).
    And we gained next conclusion after appraising qualitative deterioration of the alloy in quantity by cotributive percentage of casting defect.
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  • Tsutomu Okajima, Hiroyoshi Takahashi, Toshio Hosoi
    1986 Volume 30 Issue 1 Pages 81-87
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    The purpose of this study was to develop a new method of calculating the bite force of patients using electromyography. In the report we describe a sampling frequency for analog-to-digital conversion in the computerized data analysis system.
    To summarize the results:
    1. A sampling frequency of 2 kHz per data channel is suitable for measurement of the calibration voltage of the EMG amplifier.
    2. A sampling frequency of 1-2 kHz per data channel is suitable for analysis of integrated EMG.
    3. A sampling frequency of 2 kHz is suitable for the analysis of the rhythm and coordination of mastication.
    Further study is necessary to establish the necessary theoretical foundations and parameters in order to measure the duration of the EMG using the computerized data analysis system.
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  • Shunsuke Ando, Niichiro Amano, Sin-ichi Masumi, Sizuo Toyoda, Nagayosh ...
    1986 Volume 30 Issue 1 Pages 88-99
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    A new type of high vertical dimension splint (HV splint) has been designed and produced. The HV splint, when set on either the maxilla or the mandibule, provide a minimum of 10mm of interocclusal space between the upper and lower first premolars and allow only the molar regions to come in contact during centric relation and eccentric movement. Such splints were applied in 92 patients with temporomandibular arthrosis. A very satisfactory result of 90.3% in effectiveness was obtained after follow-up observation for three months. The recovery ratio classified by symptoms and the ratio of effectiveness by age group of the patients test for the HV splint were as follows:
    A. Recovery ratio by symptoms observed at the first visit;
    () shows the number of patients.
    (1) TMJ pain during biting (35) 91.4%
    (2) Movement pain with opening and closing mouth (63) 84.1%
    (3) Restricted opening with pain (26) 92.3%
    (4) Restricted opening without pain (8) 62.5%
    (5) Joint noise (43) 65.2%
    B. Ratio of effectiveness by age group:
    (1) 10-19y (18) 94.4%
    (2) 20-29y (22) 95.5%
    (3) 30-49y (26) 76.9%
    (4) 50 and over (26) 96.2%
    The following items were discussed to be the possible mechanisms by which HV splint affected symptoms:
    (1) The neuromuscular resting point on BT-EMG was realized at interocclusal distance of 10mm as described by Manns.
    (2) The tempromandibular joint was extended downward.
    (3) Free movement of the mandible was made possible with elimination of overbite.
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  • Part 2. Measurement of Complete Denture Base Surface Area
    Shuji Ando
    1986 Volume 30 Issue 1 Pages 100-107
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    A three dimensional measurement system by 35mm non-metric SLR camera was developed (Part 1).
    The purpose of this study was to examine the propriety of the application of the above mentioned system with addition of one other instrument, for clinical prosthodontics, especially in the measurement of complete denture base surface area.
    In this experiment, three dimensional concave and convex curved metal test pieces were used to evaluate the accuracy of measuring curved surface.
    Additionally, this system was applied to the measurement of complete denture base surface area and edenturous cast model surface.
    And then the measurements were compared with one previous measurement system for accuracy.
    From the three dimensional data obtained from this system, three dimensional color photographic representations of measured objects were also attempted.
    Results were as follows:
    1. Measurement errors of the test piece surfaces were -1.6% on the average.
    2. This system was applicable to measure the denture base surface area.
    3. Measured objects could be represented by three dimensional color photographs (Photo. 6-11).
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  • Part 1. Sagittal Inclination of Incisal Path
    Kazumasa Katoh
    1986 Volume 30 Issue 1 Pages 108-127
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    There have been not many experimental studies about the influence of incisal path on condylar path, though it is important to know it in clinic. By changing the sagittal inclination of incisal path, the condylar path was influenced both in distance and in inclination.
    When the sagittal inclination of incisal path was smaller than that of condylar path, the distance of the tracing of the kinematic-axis point was longer than that of incisal path. The smaller the inclination angle of the incisal-condylar points line in the sagittal view was, the longer the distance of condylar path was.
    The inclination angle of the tracing of the arbitrary condylar points depended on its locational relationship with the specific line that intersects at nearly right angles to the condylar path through the kinematic-axis point. That is, the arbitrary condylar points on the specific line had reproducible inclination angle of condylar tracing equally as that of the kinematic-axis point. When the inclination angle of incisal path was smaller than that of condylar tracing, the points located in front of the specific line had larger inclination angle, and the points located behind the specific line had smaller inclination angle.
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  • Yozo Hikida, Keiji Saratani, Koichi Kimura, Masahiro Tanaka, Masakazu ...
    1986 Volume 30 Issue 1 Pages 128-134
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    The purpose of this study is to establish a new method which can objectively catch the acceleration step response of the tooth supporting structures.
    The fracture of the pencile-lead (the protruded length: 5mm, the diameter: 0.3mm, the degree of optical density on paper: 2H) for generating a source as a step function was applied to the tooth surface.
    As the results, this source conventionally oscillated tooth and its supporting structures with reproducibility.
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  • Jun Nakazawa
    1986 Volume 30 Issue 1 Pages 135-154
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    Pressures exerted by the mouth floor upon the lingual border of mandibular denture during various oral functions have a great influence on the retention of a complete denture.
    In this study the amount of pressures exerted with respect to the specific locations of the lingual denture border and with respect to the specific types of oral movements were measured.
    Five subjects, each with a free-end saddle were selected, and the vertical pressures to the occlusal plane from the mouth floor were recorded. Three miniature sensors were placed at the denture border placement areas along the lingual surface of the mandibular ridge, and measurements were taken at four different levels of depth from the occlusal plane. At each sensor position, patients were asked to perform prearranged movements which were selected from various oral functions.
    The findings are as follows;
    1. At the centric occlusion, the pressure exerted is low and stable.
    2. At the centric occlusion also during prearranged movements, as the location of sensors becomes deeper, the pressure measured increases. This tendency is quite evident, especially at the anterior aspect during prearranged movements except for the deglution.
    3. During the deglution the higher pressure is recorded toward the posterior aspect.
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  • Part I Displacements of Teeth and Deformations of Surface Contoures
    Hirohito Urume, Yukio Kubota, Hiroaki Yamada, Naotaka Tajima, Kunio Iz ...
    1986 Volume 30 Issue 1 Pages 155-168
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    In this study, the authers set-up the origin and coordinate axes outside of the denture and working cast, and measure the displacements of teeth and deformations of surface contoures during process of full denture construction using heat-curing resin (Acron and Lucitone 199).
    The conclusions are follows:
    1. Displacements of teeth
    1) Horizontal direction
    In all dentures, the teeth displace toward inside and forward after cured. The displacement of posterior is larger than the anterior.
    2) Vertical direction
    In all dentures, the teeth displace toward occlusal surface. In upper dentures, the displacement of posterior is larger than the anterior, and in lower dentures, it's relation is conversely. After removed from the cast, the displacement is larger than before.
    2. Deformations of polished surface contoures (in upper denture)
    In all dentures, the polished surface deformes upward after cured. The deformations in center of palate and posterior border are larger than the others. After removed from the cast, particulary in case of Acron, the polished surface deformes upward more than before.
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  • Osamu Tanaka, Kensuke Yamagata, Kunihiko Sakaguchi
    1986 Volume 30 Issue 1 Pages 169-178
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    This study investigated the influence of maxillary anterior sanitary pontics on pronunciation, which might be caused by the passage of air through the space between the pontics and the underlying tissue. Two types of experimental resin pontics-sanitary pontics and ridgelap pontics-were temporarily cemented to the abutment teeth in 5 subjects who were missing anterior teeth. Comparative analyses of the articulation of sibilants were done with both types of pontics indicated.
    The results are as follows
    1. Subjective speech disorders were found immediately after the cementation of sanitary pontics in each of the 5 subjects, but the disorders became less noticeable as time passed.
    2. Objective speech disorders were not found immediately after the cementation of sanitary pontics in any of the subjects.
    3. The sound spectrograms of voice sounds /s/, /∫/, /ts/ and /t∫/ when using sanitary pontics were different from those of the ridge-lap pontics in 4 of the subjects.
    4. Mandibular positions during /s/, /∫//ts/ and /t∫/ sound articulation immediately after the cementation of sanitary pontics were slightly different from those of the ridge-lap pontics in 4 of the subjects. However, no significant difference was found a month after the cementation of the sanitary pontics.
    5. The palatograms when using sanitary pontics were different from those with the ridgelap pontics in 3 of the subjects. With sanitary pontics, the contour of the tongue palate contact area became enlarged in the anterior region, but these changes of the palatograms disappeared a month after the cementation of sanitary pontics.
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  • Nobuo Ishihata, Hiroshi Mizutani, Minoru Ai
    1986 Volume 30 Issue 1 Pages 179-188
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    It is always submitted to indication of tooth extraction when advanced caries, traumatic destruction, or lateral root perforation reaches to alveolar bone crest. However, if we can forcedly elongate such conditioned tooth, then sound tooth structure will appear out of gingiva and we can make a restoration very easily.
    The orthodontic wire technique which elongates tooth is not often used for the adults in daily clinical practice, since it is difficult to adjust orthodontic forces, in addition it produces anterior aesthetic deformities and uncomfortableness.
    Here we introduce SmCo5 magnetic elongation technique, which makes up for the above mentioned demerits, and its clinical cases.
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  • An Edentulous Patient after Hemiglossectomy
    Tetsuo Ichikawa, Shusai Satoh, Hiroyasu Ichiba, Masaru Hada, Naoyuki M ...
    1986 Volume 30 Issue 1 Pages 189-198
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    In an edentulous patient after hemiglossectomy, acoustic characteristics of soundswere studied with and without complete dentures of different morphology. Forms of the denturepalatal plate were changed as follows: 1. normal palatal form 2. augmented form in the anteriorregion 3. augmented form as extensively as tongue, floor of the mouth and lower denture can bein contact with. Acoustic parameters characterised sounds were Formant, Voice onset time, Energy, Spike file and Spectral pattern. They were calculated with a minicomputer by usingliner prediction method and time domain method.
    Result
    1. Acoustic characteristics after the hemiglossectomy were as follows.
    (1) Formants characterised five vowels were similer one another as compared with normalsubjects and five vowels had a tendency to be centralization.
    (2) Lingua-alveolar plosive sound (/t/) was mistaken as bilabial sound (/p/).
    (3) Lingua-velar plosive sound (/k/) was mistaken as fricative sound (/h/).
    2. Improvement in sounds (especially, /i/ line and /∫/ sound) was observed with the augmentedcomplete denture as extensively as tongue, floor of the mouth and lower denture can bein contact with palate.
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  • Part 1. Analysis of Clinical and Experimental Findings
    Shigemi Ishikawa, Kunihiko Ito, Kazutoshi Furukawa, Sozo Ito, Kunihiko ...
    1986 Volume 30 Issue 1 Pages 199-206
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    Localized gingival discoloration can sometimes be observed around fixed prosthesis, and our main objective was to investigate those clinical findings where gingival discolorationswere thought to be caused by cast core preparations. Gingiva of dogs were used to clarify the mechanismof this type of discoloration.
    Clinical findings revealed large amounts of granular pigmentations within the lamina duraregion of the gingiva, and chemical tests revealed silver sulfate to be the main substance.
    Experimental findings showed the cause of discoloration to be due to metal fragmentationsflying into the subgingival region around the tooth abutment during the cast core preparation.The metal fragmentations, after remaining in the lamina dura region for a period of 4 weeks, can be observed through the epithelial membrane, but not to the extent of those found in theclinical findings. Metal fragmentations were also found to be fairly large with inflammatory Cellinfiltration within the surrounding gingival region. Chemical analysis also revealed amounts ofsilver, but no traces of silver sulfate.
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  • Innuence of Porcelains and Surface Treatment Methods
    Hide Yamamoto, Kiyotaka Munakata, Shoji Sekiguchi, Shuichi Suzuki, Kaz ...
    1986 Volume 30 Issue 1 Pages 207-215
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    Shear adhesive strength (after 24 hours water immersion period) of dental adhesivecements to dental porcelains were investigated. As adhesives, Super-Bond C & B, Panavia-EXand HY-BOND Carbo Cement were used. As adherends, VITA VMK 68 opabue, VITA DUR-Ncore and Cerachrome-L were used. The surface treatments of porcelains were as follows.
    1. Polishing by # 600 Emery paper, 2. Sand blasting by 50 μmφ glass beads, 3. Sand blastingby alumina powder which had 20-40 μm particle size.
    The results were summarized as follows.
    1. Super-Bond C B had excellent adhesion to any porcelain on any surface treatment.
    The adhesive strength were 220-310 kgf/cm 2.2. Panavia-EX were influenced by surface treatment of porcelain. Sand blasting by aluminahad good effect on adhesion.
    3. Panavia-EX had higher adhesion to aluminous porcelain than metal fusing porcelain.
    4. HY-BOND Carbo Cement showed somewhat of adhesiveness to VITA VMK68 opaque.
    The adhesive strength were about 100 kgf/cm2.
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  • Toshiya Kuwabara, Takahiro Mizumori, Takao Kuwahara, Koichi Nishio, Ma ...
    1986 Volume 30 Issue 1 Pages 216-226
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    In order to investigate the effect of TMJ abnormality on the chewing movement, thesoft gum chewing movements were observed in 23 stomatognathic dysfunction patients by using Sirognathograph Analysing System. The 23 patients were divided into four groups by generalclinical examinations including simultaneous multilayer polytomograph. Group 1 consisted of sixpatients diagnosed as closed lock without bone change. Group 2 consisted of six patients diagnosedas closed lock with bone change. Group 3 consisted of four patients with TMJ bone change butwithout disk displacement. Group 4 consisted of seven patients diagnosed as anterior disk displacementwith reduction. The non-symptomatic side chewing movement of patients in Group1, 2 and 3, which means the patients with closed lock or bone change in TMJ had high tendencyto show deviation to the symptomatic side.
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  • An Association between Bony Changes and Clinical Findings of Periodontal Disease
    Kazuko Noguchi, Yoshikazu Yamaguchi, Masato Mikai, Hiroyuki Fujii, Yus ...
    1986 Volume 30 Issue 1 Pages 227-234
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    An associations between bony changes in the marginal interproximal areas on bisect. ing-angle technique radiograms and clinical findings (Plaque Index: PI, Probing Depth: PD, Calculus Index: CI, Bleeding Index: BI, Gingival Index: GI, Teeth Mobility: TM) related toperiodontal disease were examined. Subjects were 31 prosthodontic patients with the early stageof periodontal lesion (Table 3).
    1. Regarding the bone height, significant association was found between the bone scoreand PD (P<0.005), CI (P<0.005) and TM (P<0.0005).
    2. Regarding the type of bone defect, frequency of H-type of bone loss was higher in thesamples with dental calculus than in ones without dental calculus (P<0.05).
    3. Significant relations were also detected between continuity of the lamina dura and CI (P<0.05).
    4. As to periodontal space, no significant clinical finding existed so far as we examined.
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  • inforcement of Self-cured Type Resin Base Using Co-Cr Alloy Wrought Clasp Wires
    Yoshiki Nakahira, Yoshinobu Maeda, Masatoshi Okada, Takayuki Ohtani, T ...
    1986 Volume 30 Issue 1 Pages 235-241
    Published: February 01, 1986
    Released on J-STAGE: August 10, 2010
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the reinforcing effect of self-curing typeresin denture using Co-Cr alloy wrought clasp wires coated with self-curing type 4-META adhesiveresin (Metafast). The evaluation was carried out by comparing the values of the load atproportional limit and the deflection under 2 kg load obtained by the transverse test.
    Using Co-Cr alloy clasp wires as strengtheners with self-curing type 4-META adhesive resin inself-curing type resin denture base, greater values of the load at proportional limit and smallervalues of the deflection under 2 kg load were obtained.
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