Journal of Japanese Society of Oral Implantology
Online ISSN : 2187-9117
Print ISSN : 0914-6695
ISSN-L : 0914-6695
Volume 6, Issue 1
Displaying 1-17 of 17 articles from this issue
  • Hiroki Murakami, Yutaka Nishijima, Youichi Ikeda, Masahiro Iwata, Naok ...
    1993 Volume 6 Issue 1 Pages 1-5
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    The SUMICIKON channel saw become available.This method, in which a new saw and an ordinary drill are used together, permits standardized bone channeling.
    The only channel bar method of the SUMICIKON's primary fixing situation was better than another blade-vent implant, that some clinical statistics of PERIO TEST reported satisfactory results in clinical use.
    And the clinical situation of postoperation is influenced by a good or poor bone channeling.
    Then we researched some effects of the inner cooling channel saw. Here is the report concerning the circulation efficiency of cooling water,1)inner cooling saw, 2) outer cooling saw.
    The method of examination: We made a piece for experiment, glass plate and metal plate, with channeling hole far insertion. We filled that hole with colored water, used methods 1) and 2), channeling the image at 600 r.p.m. with a low speed engine, filmed the circulation efficiency of the color by the inter cooling channel saw with a CCD (8 mm video) camera, graphically processed this with Macintosh II ci with Raster ops 24 STV(video board), and measured a gray histogram scale with Ultimage 1.4.1.
    Result
    1. Inner cooling method 0 sec.=37.86 (S.D.=0.91), 1 sec.=40.52(S.D.=1.03), 2 sec.=86.16(S.D.=0.94), 3 sec.=104.95(S.D.=0.96)
    2. Outer cooling method 0 sec.=45.96 (S.D.=2.20),1 sec.=37.36(S.D.=2.35),2 sec.=34.90(S.D.=2.06),3 sec.=42.78(S.D.=1.95), 4 sec.=57.51(S.D.=2.18),5 sec.=112.07 (S.D.=1.96) Those results of inner cooling saw method were better than outer cooling method.
    Download PDF (698K)
  • Tomoyoshi Aso, Hirofumi Murase, Yukiko Motohashi, Masakazu Masuzaki, Y ...
    1993 Volume 6 Issue 1 Pages 5-12
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    We have done dental root implant operation using 2-piece implant for 47 patients (155 pieces) from July,1987 to September,1991. As a result,128 pieces (88.9%) were acceptable.
    155 pieces of APACERAM® were applied to 47 patients. This implant was guaranteed to be physically and chemically stable with excellent affinity to tissues and exhibit particularly excellent bony ankylosis with osseous tissues. We had a two-step method. The first step was to implant a dental root called fixture into the submucous bone tissues. The second step was to implant abutment 6 months after the first step.
    Prosthetic appliances has a telescopic construction consisting of inner and outer crowns designed. The outer crowns were relined by 500μm thick BIOTRON-R® made of polyurethane plastic to create a buffer for the abutment. The crowns can be freestanding with no need for bridges or other anchors to adjacent teeth.
    Download PDF (1034K)
  • ―A Removed Case Owing to a Miscalculation―
    Osamu Nakade, Tomoyuki Ohuchi, Makoto Ochi, Tohru Kaku, Toshiyuki Sugi ...
    1993 Volume 6 Issue 1 Pages 13-20
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    ITI, a kind of endosseous implant, is generally designed as a perforated hollow cylinder or a perforated hollow screw. It is made of pure titanium as an implant material. The undersurface of the implant to be anchored in bone is coated by a titanium-plasmaspray. It is well known that a direct bond is made without any soft tissue at the interface between ITI implant and the bone. These findings were mainly obtained from animal experiments and rare human cases.
    We present a case of removed ITI implants (two-part, hollowscrew type) owing to miscalculation. We observed its interface between the implants and the bone by SEM, undecalcified thin section for histological study and EPMA for an analysis of the main constructive elements.
    As a result, the following findings were obtained.
    1. There was a direct bond between the implant and the bone interface.
    2. The bone formation was seen in the gaps among microparticles arising from titanium-plasmaspray coating, as well as within the side perforated portions.
    3. For the EMPA data, the implant material mainly consists of titanium and the bone is chiefly made up of calcium and phosphorus. The distribution of titanium has a contrary relation to calcium and phosphorus which makes a good interface.
    We concluded that ITI implant could be expected to have good biocompatibilty in humans as in animal experiments. However, great care should be taken in ITI implementation.
    Download PDF (1330K)
  • Kohichiro Ihara, Masaaki Goto, Yuuki Uchida, Nobuyuki Noguchi, Eiro Ku ...
    1993 Volume 6 Issue 1 Pages 21-31
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    Three-dimensional image reconstruction and analysis of teeth from serial sections have been tried in oral anatomy and orthodontics. In oral and maxillofacial surgery too, three-dimensional information about natural teeth is needed as basic data, when dental implant insertion and/or mandibular reconstruction. In this study, three-dimensional images were obtained to observe and analyze the surface area and volume of the natural teeth.
    Fourteen extracted adult teeth were used in this study which included incisors, canines, premolars,and molars of the upper and lower jaws.
    Teeth were first embedded in polyester resin with noncalcification, and 200 microns thick serial sections were made. After enlargement, each section was traced in terms of the enamel, dentine, and pulp cavity contours and the information was fed into a computer. Three-dimensional data of each tooth were then obtained by using three-dimensional image reconstruction software (TRI).
    In the surface area of the root of natural teeth, maxillar incisor and canine were larger than their mandibular counterparts; molars were larger in the mandible than in the maxilla. Results were the same in terms of the dental volume. When the root surface area of natural teeth was compared with that of Branemark implants (3.75 mm in diameter), lateral incisor, premolar in the maxilla and incisor, lateral incisor, canine and first premolar in the mandible turned out to be equal to a 13~18 mm fixture. The surface area of canine, first molar in the maxilla, and molars in the mandible were larger than the surface area of a 20 mm fixture.
    This method is time-consuming but far more accurate than the usual method; it is also very effective. In the future, we shall try to obtain average values of the surface area and volume of natural teeth for more detailed analysis, e.g., dynamic analysis when a tooth is under occlusal stress, and for comparison with dental implants.
    Download PDF (1595K)
  • Hiroshi Nakamichi, Teruo Nakajima, Shinya Nakamura, Masahiko Isogai, T ...
    1993 Volume 6 Issue 1 Pages 32-38
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    In 1977, porous alumina implant material was reported for single standing dental implant system use by KAWAHARA et al. And this material was on the Japanese market in 1988. After that, this material was immediately tried for dental implant use in our clinic.
    Seventy implants of this material for 38 patients were implanted for clinical therapy from 1988 to 1989. Patients were 22 female and 16 male (1.4:1), And the ages were from 33 to 67 years old (mean 44.4 years old).
    Of these 70 implants,18 implants were implanted for the single standing with single crown. And 52 implants were used for connected crown with natural teeth and for abutment teeth for bridges.
    The cases of failure implants were 11 pieces in 8 patients. It was 15.7 percent in all implants. And the main factor of failure cases was that the break and infection of φ42 single porous alumina implants system, only.
    Download PDF (1140K)
  • Keihachi Fukunishi
    1993 Volume 6 Issue 1 Pages 39-45
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    Porous alumina ceramics implant is developed in KAWAHARA et al. in 1977.
    This porous alumina ceramics implant was used in the free-standing form in this animal experiment, and the possibility of free-standing use of this implant was analyzed. In addition, in the case of poor prognosis, the purpose of this experiment was to analyze the course of poor prognosis.
    26 pieces of the porous alumina ceramics implants (Kyocera Co., Ltd., Kyoto, Japan) were used for materials.
    10 adult dogs were used as the experimental animals. Implantations to the mandibles were done by the usual method. Observations were done from 3 to 24 months under the condition of free-standing and natural varieties of occlusion. Among 26 implants, 23 cases did not have any abnormal findings and had rigid fixations. 3 cases had the inflammatory granulations, so, in those cases, clinical findings, X-ray findings, and microscopic findings were analyzed.
    In addition, the implants were done under the 3 variations of those depth of implantation, such as shallow, deep, and medium, to analyze the course of poor prognosis. One case, such as the porous zone of implant body which was implanted shallowly, had the inflammatory granulations. In its X-ray finding, it had a radiolucent area around the implant body. Another case, such as the porous zone of implant which was implanted 3 mm deep from the margin of alveolar bone, did not have such findings.
    In conclusion, this porous alumina ceramics implant is considered to be effective for free-standing use, when it was implanted less than 3 mm under the margin of alveolar bone and kept the primary fixation with the suitable occlusal stress.
    Download PDF (1034K)
  • Yoshihiro Matsushita, Masahiko Isogai, Hiroshi Ohsawa, Yasuhito Morish ...
    1993 Volume 6 Issue 1 Pages 46-52
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    Guided tissue regeneration with Gore-Tex tissue augmentation material (GTAM) can be applied to such osseous defects as those which occur around endosseous implants for formation of new bone. This could result in more predictable regeneration or expansion of the patient's remaining bone.
    This report describes endosseous implant used with GTAM membrane for getting new bone regeneration. The implant was placed into the extracted tooth socket immediately. The patient was a 47-year-old female and received an implant on tooth No. 11.6 months after implantation, new bone formation was observed surrounding the endosseous implant.
    We also studied the microstructure of the GTAM membrane consisting of the inner portion, the outer portion, and its junction by means of scanning electron microscopy. The microstructure of the GTAM membrane was revealed as a characteristic structure by scanning electron microscopy.
    The present study suggests that GTAM membrane is considered to be a useful synthetic material for restoration of bone defects.
    Download PDF (1142K)
  • Yong-Cheng Zhang, Teng-Long Hu, Li-Min Mao, Yan-Chang Wu, Chun-Lin Qin ...
    1993 Volume 6 Issue 1 Pages 53-60
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    Decalcified bone made from dog long bones was allografted into extracted teeth sockets of dog mandible to prevent alveolar bone resorption. The degree of alveolar bone resorption was measured by image analyzer, and histologically observed. The teeth extracted sockets with allografted decalcified bone were filled with newly formed bone tissue and prevented alveolar ridge resorption. Pathological findings such as inflammation were hardly seen in this study. It is concluded that decalcified bone transplantation was recognized to be a useful material as a bone augmentation to maintain the ideal clinical condition to prevent alveolar ridge resorption.
    Download PDF (1338K)
  • Tohru Ohtsuka
    1993 Volume 6 Issue 1 Pages 61-74
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    The purpose of this study is to reveal the most practical, effective shock-absorbing structure for dental implants. First, I studied the mechanical properties, imperviousness to water and endurance of polyurethane used as absorbing materials.
    Next, I measured the displacement characteristic, the impact force response and the impact acceleration response of clinically applicable absorbing structures-the superstructure (hard resin), inside the superstructure (polyurethane), and in the tooth root (polyurethane, sillicone)- and their absorbing effects.
    As a result,
    1. Polycarbonate type polyurethane was excellent in mechanical strength, elasticity, imperviousness to water, and endurance and proved to be an appropriate absorbing material.
    2. The displacement of the absorbing structure in the tooth root using polycarbonate type polyurethane was approximate to that of a natural tooth, and its shock-absorbing effect was the highest.
    The above results suggested that the method of placing an absorbing structure in the root of dental implants was a practical as well as effective method, which provided displacement similar to that of a natural tooth and provided an efficient impact-absorbing effect.
    Download PDF (2221K)
  • Yasumasa Akagawa, Hironori Kaide, Yoichiro Ichikawa, Takayasu Kubo, Te ...
    1993 Volume 6 Issue 1 Pages 75-81
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    For long-term stability and favorable function of the endosseous dental implant, direct bone contact with the implant is highly recommended. From such a standpoint, the 2-stage implant procedure is more preferrable. However, in the 2-stage implant procedure, the problem of the gap between fixture and abutment still remains.
    In this study, we developed a new 2-stage implant procedure in which the fixture and lower portion of the abutment were coated with hydroxylapatite (HA) to achieve bone sealing of the gap between fixture and abutment. Four monkeys were used. Eight newly designed HA-coated implants and eight uncoated implants as a control were inserted into the prepared edentulous area. After 3 months of insertion, the abutment with/without HA-coating was connected to the fixture by lock screw. Animals were sacrificed 5 and 10 weeks after abutment connection. Undecalcified ground sections were made and examined by light microscopy. Lock screws were loose in some implants. In these cases,severe inflammation was observed at the gingiva around the implant, and no bone formation was observed there. However, in other cases in which lock screws were not loose, the gap between fixture and abutment was completely sealed by newly formed bone tissue.
    Download PDF (1048K)
  • Morio Ochi
    1993 Volume 6 Issue 1 Pages 82-96
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    Orthopedic cases of bone fracture have been treated by pulsing electromagnetic fields (PEMFs) which has the enhances quick healing. This study was to observe the cell proliferation and differentiation found in PEMFs to better understand its possible value in dental procedures.
    The MC3T3-E1 cells were inoculated intoφ35 mm plastic dishes containing 2 ml α-MEM supplemented with 10% fetal bovine serum at 37℃ in a humidified atmosphere of 5% CO2. The medium was changed every 3 days. The cells were exposed to vertically directed PEMFs by placing the culture dishes between the φ70 mm helmholtz coils.
    Results of the study indicated the following:
    1. The best parameter of stimulation effect on DNA synthesis was 3 gauss, 25 μsec,100 Hz. The incorporation of 3H-thymidine increased the control cultures not exposed to the fields by up to 92% (p<0.001,t-test).
    2. As compared to the controls, the DNA content in the stimulated samples had a significant 126% increase (p<0.001, t-test) after 3 days and 36% increase (p<0.05, t-test) after 6 days.
    3. The best parameter of stimulation effect on alkaline phosphatase (ALPase) activity was 3 gauss, 25 μsec, 100 Hz. ALPase activity increased the controls by up to 28% (p<0.01, t-test).
    4. Exposed cells and controls were examined by phase-contrast micrograph. The cells did not show a considerable change in morphology.
    From the above results, PEMFs (3 gauss, 25 μ sec,100 Hz) stimulation promoted osteogenic cell proliferation and differentiation. On the basis of these results, I feel that this treatment can be used in the field of dentistry.
    Download PDF (2451K)
  • Yukito Hirose
    1993 Volume 6 Issue 1 Pages 97-107
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    An anchorage period in jawbone of implant material is very important for the treatment needing oral implants, and it appears to be considerably effective during the convalescing period. The author suggested that the period was shortened by pulsing electromagnetic fields (PEMFs) which was used in the treatment of pseudoarthrosis in orthopedic cases. However, the effect of PEMFs on an osteogenic cell cultured on the implant material surface was not investigated quantitatively. The purpose of this study was to obtain the quantitative measurement for effects of PEMFs on osteogenic cell. Cells were placed on the three kinds of implant materials (singlecrystal aluminum oxide, polycrystal aluminum oxide, titanium) and then the cells were cultured by PEMFs.
    The Osteogenic cell which was used in this study was the MC3T3-E1 cell line. Cells were placed as 6 × 103 cells on the implant materials, and cultured in 2 ml of α-MEM supplemented with 10%fetal bovine serum and 60 μg/ml of kanamycinesulfate. Cells were maintaind at 37 ℃ in a fully humidified atomosphere of 5% CO2 in air. The medium was changed every 3 days. Cells were exposed to vertically directed PEMFs (3 gauss, 25 μsec,100 Hz) by placing the culture dishes between the helmholtz coils. Experimental cultured samples were continuously exposed for 5, 7, and 9 days.
    In this study, the findings can be concluded as follows:
    1. The PEMFs stimulated for 3 gauss, 25 μsec, 100 Hz to the clone MC3T3-E1 cells on these implant materials were DNA and protein content. This suggests that PEMFs stimulation promoted osteogenic cell proliferation on the implant materials.
    2. The result of 1. revealed that these implant materials were not inhibited and the effect was to promote cell proliferation by PEMFs.
    3. The clone MC3T3-E1 cells on these implant materials were increased for alkaline phosphatase activity and hydroxyproline content. This suggests that PEMFs stimulation promoted osteogenic cell differentiation.
    4. This study indicated that a titanium material had an inclination for further promoting cell proliferation and differentiation than a singlecrystal and polycrystal aluminum oxide material.
    PEMFs stimulation promoted ostogenic cell proliferation and differentiation on the implant materials.
    Download PDF (1939K)
  • ―A Case Examined by Periodontal Procedures―
    Takamichi Matsui
    1993 Volume 6 Issue 1 Pages 108-122
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    There has been less research work on the necessity of attached gingiva (keratinized immobile mucosa) in the practice of placing implants than that on natural teeth.
    The following observation was made in this study to know what kind of influence the nonkeratinized mobile peri-implant mucosa has on the peri-implant tissue.
    This is the chronological evaluation made by periodontal parameters in a case of mandibular free end concerning the nonkeratinized mobile mucosa on the buccal side and the keratinized immobile mucosa on the lingual side of the implant.
    In addition to this treatment, the implant was placed after the gingival grafting on the opposite buccal side so that the keratinized mobile mucosa might be acquired on both sides to compare the right side with the left side.
    The results obtained were as follows:
    1. The nonkeratinized mobile mucosa contacting the implant easily induces inflammation, and the progress of inflammation is fast. At that moment,the periodontal parameters react remarkably. The keratinized immobile mucosa around the implant plays a definite role of defense against the outside stimulation and restrains the appearance of inflammation.
    2. At the moment of the implant being placed, if it contacts the nonkeratinized mobile mucosa, it is necessary to acquire the keratinized immobile mucosa in order to stabilize the peri-implant tissue in good condition for a long time.
    Download PDF (1987K)
  • Kimito Nakano, Tomiichi Harada, Yoshio Eguchi, Masaki Umezu, Shuukichi ...
    1993 Volume 6 Issue 1 Pages 123-129
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    In recent years, many implantologists have performed various endosteal implants. But they need to utilize subperiosteal implants, because there are many people who require subperiosteal implants.They are often old and are considered to have general disease. In this case, we need both to moniter their general condition and to utilize intravenous sedation with regional anesthesia.
    This time, we report an experience, as we performed an operation of a subperiosteal mandibular edentulous arch implant on an old woman, who had hypertension, utilizing intravenous sedation and regional anesthesia at the same time.
    As a result, we found an advantage for using intravenous sedation.
    1. Due to the amnesia effect, patients forget the uncomfortable experience of pain.
    2. Operaters can operate over a long period of time.
    3. Operaters can expect a thought-provoking result.
    4. Operaters can increase the threshold value of pain.
    5. Surgeons can decrease a patient's tension and terror.
    6. Surgeons can decrease their stress, as a patient dosen't complain.
    7. Surgeons can administer drugs intravaneously.
    Download PDF (1071K)
  • Katsuyuki Ikumi, Tetsuya Yamada, Shogo Shioji, Yutaka Toyama, Shinichi ...
    1993 Volume 6 Issue 1 Pages 130-135
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    We have utilized many kinds of titanium blade implants for over nineteen years. It is recently considered that osseointegration is superior to fibrointegration. So, various types of H.A.-coated blade implants have been developed.
    Any blade implants must be connected to natural teeth. So, there seems to be the possibility that the concentration of stress is caused in the complex of the superstructure, supporting teeth and the implant that is connected directly to the bone without fiberous tissue. We have experienced some troubles that might be caused by it. Therefore, we concluded that we must be careful due to the design of the superstructure when connecting natural teeth and osseointegration type implant.
    Download PDF (857K)
  • Takao Kato, Yuzuru Takeda, Yuri Nakano, Tatsuo Ishii, Fukumitsu Yamagu ...
    1993 Volume 6 Issue 1 Pages 136-141
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    In recent years, dental implant is widely used in many cases, but satisfactory results can not always be obtained. This report showed a case of bladevent endosseous implant in the maxilla which had caused false trigeminal neuralgia of the infraorbital nerve, peripheral osteitis of the maxilla and maxillary sinusitis on the left side. Removal operation of the implants, radical antrum operation of the sinus, and medicinal therapy for neuralgia were performed.
    Download PDF (936K)
  • ―Questionnaire to Active Members of Japan Society of Oral Implantology―
    Tsuneo Suetsugu, Kiyoshi Koyano, Keiichi Nishida, Kazuhiro Fujita, Hir ...
    1993 Volume 6 Issue 1 Pages 142-157
    Published: March 31, 1993
    Released on J-STAGE: August 31, 2018
    JOURNAL FREE ACCESS
    Japanese Association for Dental Science set up a research project“ lnvestigation of the present status of oral implantology”. Dr. SHOJI ENOMOTO (professor of oral surgery in Tokyo Med.& Den. Univ.) and 8 others made a project team for the investigation. The authors took part in the project. We mainly investigated the prognosis of clinical implantology.
    Thirty-four questions were selected and mailed to 430 active members of Japan Society of Oral Implantology. The major questions were as follows; 1.personal conditions when starting implant clinic, 2.personal histories of implant clinic, 3. fees of implant and superstructure, 4. prognosis of each implant and recall system, 5. failures of implants and it's follow-up, 6. success criteria of implants and 7. opinions and attitudes toward future implantology.
    One hundred and fifty-two answered questionnaires (35.3%) were returned. As a result, the confirmation of the present status of failure rate and survival rate of each implants was unobtainable. However, we collected plenty of information on clinical implantology in our country. And especially, educational conditions, personal histories of implants applied in clinic, fees of implants and superstructures, recall of implanted patients, success criteria, opinions and attitudes toward future implantology, and the trends of Japanese clinical implantology became apparent. We think that new materials and designs for implants will be developed, and clinical implantology will gain a more important position in the daily dental clinic in the 21st century.
    University men should realize the reliability of oral implants, reform the educational curricula and try to catch up with Euro-American dental schools and offer good educational opportunities for the freshmen in implantology.
    Download PDF (2481K)
feedback
Top