Journal of Japanese Society of Oral Implantology
Online ISSN : 2187-9117
Print ISSN : 0914-6695
ISSN-L : 0914-6695
Volume 4, Issue 2
Displaying 1-12 of 12 articles from this issue
  • Part 1.Evaluation from Pathology, Oral Surgery and Prosthodontics
    Masahiko Ozeki, Sonhi Kim, Yoshimasa Igarashi, Akihiko Shiba
    1991 Volume 4 Issue 2 Pages 139-159
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
    It must be remembered that any dental implant has the possibility to fail, because the implant is one of the artificial materials in dentistry. However, it is well-known that the treatment for the unsuccessful implants are not easy, because the excision of the implant from the jaw bone is sometimes very difficult and the postoperative bone resorption is often so severe that the implant can't be installed and that the conventional removable prosthesis can not be applied.
    In this article we completely reported that the four implant failure patients were treated satisfactorily by the application of the removable prostheses with tapered telescopic crowns (Konuskronen) after excision of the unsuccessful implants, and then we discussed the interface between the implant and bone tissue, the excision method and postoperative bone resorption, the reconstruction with removable prosthesis and the indication for the implant therapy from the view of pathology, oral surgery, and prostihodontics.
    The results obtained are below;
    1. After the excision of the implants: If the patient had partial edentulism, the removable prosthesis with tapered telescopic crowns (Konuskronen) was very beneficial.
    2. The soft tissue was unfavorable for the interface between the endosseous implant and the bone tissue.
    3. According to the failure implant: The excision method should be selected to remove the implant simply and to minimize the postoperative bone resorption.
    4. The degree of the bone resorption after excision: The screw-type endosseous implant and the pin-shaped endodontic-endosseous implant were slight in degree, but the plate-type endosseous implant, the blade-vent endosseous implant, and the periosteal implant were prominent in degree.
    In conclusion at the present time we feel that the screw-type endosseous implant with direct bone anchoring might be most favorable.
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  • Keietsu Saigo, Tamotsu Kagaya, Shoko Tsujimura, Haruchiyo Kasai, Mitsu ...
    1991 Volume 4 Issue 2 Pages 160-163
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
    Synthetic apatites differ in forms and compositions due to the different sintering method, and precipitation of nitrogenous species is often noted.In this study, we make further investigations on the precipitation of nitrogenous species in commercial synthetic apatite using diffuse reflectional spectrophotometry to determine IR absorptions for the analization of spectral difference, etc.
    The result is that the absorption of nitrogenous species which is considered as CN22-, OCN- shown at 2,010 cm-1 and 2,200 cm-1 of all samples except CO3-Ap and the recognization of these IR absorption in synthetic apatites of different types suggests the neccesity of further detailed investigations on the biocompatibility of synthetic apatite.
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  • Keietsu Saigo, Tamotsu Kagaya, Shoko Tsujimura, Haruchiyo Kasai, Mitsu ...
    1991 Volume 4 Issue 2 Pages 164-169
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
    Due to the research from many angles, dental implants have been widely used in practice.
    From the aspect of material science, they are generally categorized as metallic implants and ceramic implants. Among them, implants utilizing pure titanium or hydroxyapatite have gained a high reputation for their superior biocompatibility and comparable stability in bones when applied in practice. Taking advantage of these characteristics, endosseous implants of titanium blade which are coated with HAP alumina by plasma sprayed technique, have been developed.
    This study, through biological testing, aims to compare changes and reactions of bone in case of pure titanium blade and HAP alumina coated blade-vent implants.
    We made the implant material free standing and adjusted the implants head in order to avoid occlusal stress and other functional pressures inside the mouth. One month after the blade insert,the bone in contact with the blade was cut out and analyzed by diffuse reflectional infrared spectrophotometry using on FT/IR-7000 infrared spectrophotometer (Japan Spectroscopic, Co.,Ltd.). The study results including spectral differences with the osseous bone are described in this paper.
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  • Keietsu Saigo, Tamotsu Kagaya, Shoko Tsujimura, Haruchiyo Kasai, Mitsu ...
    1991 Volume 4 Issue 2 Pages 170-175
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
    Hydroxyapatite is the main component of inorganic materials of bone and tooth, and has been many reported for basic examination and clinical application as medical materials. But commercial synthetic apatite component differ between companies because of its sintering or synthetic method, and its components differ from biological apatite at that.
    Then, we compared apatite compositions in order to test differences between bone apatite and commercial synthetic apatite or not. The analysis of composition examined by Infrared Fourier Transform spectrometer 7000 type (made by Japan Spectroscopic Co.,Ltd.) and measured spectra subtracted from commercial synthetic apatite (Bonetite, Apaceram)to bone apatite.
    As the results, 1)The composition differs from synthetic and bone apatite. 2)Furthermore, there was different compositions of commercial synthetic apatites with each other.
    Accordingly, it became necessary that we should consider the differences of apatite composition in living tissue.
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  • Liliana Missana, Nobuyoshi Takeshita, Tetsundo Nojima, Osamu Fujii, To ...
    1991 Volume 4 Issue 2 Pages 176-182
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
  • Iwao Kuroyama, Shigeo Osato, Kazuaki Mizoguchi
    1991 Volume 4 Issue 2 Pages 183-196
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
    As one of the types of endodontic endosseous implants, taper pins are often employed. In implanting taper pins, reamers or drills are used for enlarging the root canal exteriorly and preparing the canal taper. In this study, four operative techniques (methods A to D) are assessed from the viewpoint of the compatibility of taper pins with the canal walls.
    Method A: Drills are primarily used.
    Method B: Hand reamers
    Method C: General method (KYOCERA method)
    Method D: Engine reamers
    Materials used in this experiment include acrylic resin plates and extracted upper incisors. The compatibility was examined by use of Indian ink.
    The resalts are as follows:
    1. The compatibility between the taper pins and the canal walls created through the acrylic resin plates was not always satisfactory. The penetration of Indian ink was observed in the taper portions prepared by any of the four methods to a depth of 3 mm above the canal apices and in the straight portions further above.
    However, method A was significant in that the penetration of ink was almost limited within the 3 mm taper portion.
    2. As regards the damage to the root apices, in every method cracks and/or splinters occurred during the processes of perforating the root,enlarging the root canal and preparing the canal taper. The number of cracks and splinters was significantly smaller in methods A and D than in method C. The lengths of the cracks found after using methods A, B,and D were 0.2~2.39 mm shorter than those found after using method C. The lengths of the splinters found after using method D were significantly smaller by 0.08~0.25 mm than those found after using methods A, B, and C.
    3. The damage occurred frequently when a 13 P drill (35%), an A-reamer (22.3%) and a hand reamer (17.6%) were used.A modified A-reamer and a B-reamer caused damage frequently……4.1% and 2.0%, respectively. No damage was wrought by a 17 P drill.
    In conclusion, these results indicate that much improvement should be made on the instruments used for taper pin implantation.
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  • Takashi Miyazaki, Hisao Tanaka, Noriyasu Aoyama, Kazutaka Sugiyama, Ka ...
    1991 Volume 4 Issue 2 Pages 197-205
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
  • Takashi Miyazaki, Hisao Tanaka, Noriyasu Aoyama, Kazutaka Sugiyama, Ka ...
    1991 Volume 4 Issue 2 Pages 206-213
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
  • Takashi Miyazaki, Hisao Tanaka, Noriyasu Aoyama, Kazutaka Sugiyama, Ka ...
    1991 Volume 4 Issue 2 Pages 214-220
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
  • Part 2.SUMICIKON's PERIO TEST Values, Distinctions of Sex and Age
    Hiroki Murakami, Tetsuo Matsuda, Tamisuke Kishi, Masanori Nashimoto, T ...
    1991 Volume 4 Issue 2 Pages 221-230
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
    Last year, we reported about mobility of implants by PERIO TEST(Part.1). We took many measurements of SUMICIKON implants with PERIO TEST (PT) by the same method. PT revealed us a relation between in implant and a bone, which had many objective and quantitative results for us at chairside. We had some interesting results that distinguished of sex and age.
    Those results were as follows:
    1. The distinction of sex(male; n=20, female; n=19)Before this examination, we felt better results on the male in clinical situation. But the result was proved not to be distinction of sex. SUMICIKON is a“ Bio-integrated implant type”, has a transmit ability of a bone by HAP. That fact was, the distinction of sex<“Bio-integrated effect.
    2. The distinction of age(a.35~44 years old;n=9,b.45~54 years old;n=16, 55 years old~;n=14) We classed 3 generations of age. We researched about PT value influences of genontology, specially about the aged of females who became osteoporosis after amemorrhea. But the result proved not to be a distinction of age.
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  • ―The Corrosion Late in 0.1 N NaCl Solution―
    Masaru Yamaoka, Kakuei Sato, Tomomasa Mikami, Toshio Sueda, Hirofumi F ...
    1991 Volume 4 Issue 2 Pages 231-237
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
    It has been known that contacts of dis-similar metals in an oral cavity cause galvanic pain, corrosion or discoloration of metals. These unfavorable phenomena have been considered in the dental field for a long time. As the electrochemical aspects,the corrosion is explained by an intersection of the polarization curves when two dis-similar metals have contacted each other.
    The purpose of this study is to investigate the electrochemical behavior of dis-similar metal contacts by developing the analysis of polarization curves.
    Polarization curves of constituent metals and the curve obtained from the relation between an electrode potential and current were measured.In this circuit,the value of current was altered with changing resistance.
    Commercially pure gold, pure titanium,cobalt-chromium alloys, and nickel-titanium alloys were provided as the electrodes.
    The electrolyte solution was 0.1 N NaCl.
    The electrochemical reaction on the contact of dis-similar metals has been discussed on the experimental results obtained.
    The results are as follows:
    1. The polarization curve with a constant potentionstatic method corresponded to a potention-current curve which was obtained in the electric circuit constructed with two dis-similar metals and a resistance in a series. The same value of the short-circuit potention and current was obtained from different two curves described above.
    2. As a tendency, the short-circuit current decreased quickly with time when a polarization potention strongly depended on a polarization current.
    3. Since the polarity of the open-circuit potention did not change,it is explained that the same kind of redox reactions between dis-similar metals take place even after a long process time proceed.
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  • Kan-Ichi Nakagawa, Toshihiko Fujii, Kunihiro Yuzawa, Masahito Furusawa ...
    1991 Volume 4 Issue 2 Pages 238-245
    Published: September 30, 1991
    Released on J-STAGE: February 25, 2019
    JOURNAL FREE ACCESS
    Porous implants are dental implants provided with porous alumina ceramic roots having a porosity of 35% and an average pore diameter of 130μm were placed in the mandible of Japanese Monkeys(Macaca fuscata). After sacrificing animals periodically, at 4 and 12 months, new bone formation in the pore spaces was investigated by scanning electron microscope.
    Results
    All the implants showed a high degree of stability, throughout the experimental periods under occlusal stress. Bone ingrowth into the ceramic pores was observed in all the specimens.Scanning electron micrographs of porous layer were characterized by interconnecting three dimensional pore structures and micropores of poly-crystalline alumina. As a results of this experiment, interlocking effect divided into two regions, bone ingrowth to root pore spaces and the micro anchoring with bone to micropore structures.
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