Journal of Japanese Society of Oral Implantology
Online ISSN : 2187-9117
Print ISSN : 0914-6695
ISSN-L : 0914-6695
Volume 5 , Issue 2
Showing 1-15 articles out of 15 articles from the selected issue
  • Naoyuki Katsushima, Shukichi Aiura, Yoshiaki Ohta
    1992 Volume 5 Issue 2 Pages 217-222
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    Generally, removable partial denture has been clinically employed as prosthetic treatment for defects. However, there are many cases that the patients have not been satisfied with removable partial denture due to troublesomeness of mounting and removal, a sense of incongruity, a lowering of mastication efficiency, etc.
    Dental implanting is one of the means for dissolving such unsatisfaction, by virtue of its feature with which a fixed bridge work can be designed.
    This time, the author reports six Symptomatic cases with blade-vent implants applied to patients having free end defects and are unsatisfied with the denture setting, and one Symptomatic case of subperiosteal implanting which has been applied to a defective example after ceramic implanting.
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  • Susumu Yamane, Ryoji Shimogoryo, Takashi Tsuda, Katsunori Tanaka
    1992 Volume 5 Issue 2 Pages 223-227
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    We examined the mobility of 39 ITI Bonefit® 2-part screw implants from 3 to 6 months after implantation with Periotest®. For determination of the difference of Periotest value(PT value) in each measuring position, we examined PT values in the top of the implant body(1), in the head point 2 mm away from the top (2) and in the head point 4 mm away(3).
    In the case of (1), the PT value of an 8 mm implant length of the maxilla was -2.4 and that of 12 mm was -3.6. The PT values of 10 mm and 12 mm implant length of the mandibula were -4.7. The difference of PT value between (1) and (3)was 5.2 in an 8 mm implant length and 3.6 in a 12 mm implant length of the maxilla.The same difference was 3.2 in the case of the 10 mm implant length and 2.7 in the 12 mm implant length of the mandibula. The difference between 12 mm implant lengths of the maxilla and mandibula is significant in (2) and (3) by a 5% danger rate, but the significant difference between the 10 mm and 12 mm implant lengths of the mandibula is not recognized.
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  • Osamu Fujii, Hiroshi Koyata, Katsuhiro Kuroda, Masahisa Inoue, Yuzou I ...
    1992 Volume 5 Issue 2 Pages 228-234
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    In this study, synthetic hydroxyapatite granules sintered at 1,250℃ were coated with synthetic hydroxyapatite dried at 200℃(they were designated as LHAP-coated HAP) to develop the new synthetic hydroxyapatite consisting of synthetic hydroxyapatite produced at different sintering temperatures. By scanning electron microscopy, LHAP-coated HAP consisted of two layers; one was the outer coated layer of synthetic hydroxyapatite dried at 200℃,about 4.0~6.0 μm thick, and the other was the inner layer of synthetic hydroxyapatite granules sintered at 1,250℃. Then, granules of LHAP-coated HAP, 0.3~0.5 mm in diameter, were implanted in Wistar rat mandibles to observe, using the light microscopy and microradiograms, the behavior of newly formed bone. One week after intraosseous implantation, few inflammatory cells were found to have infiltrated around the granules of LHAP-coated HAP, and the active formation of osteoid tissue and calus surrounded by many osteoblasts were found between them. Mature lamellar bone filled the space between them, and as bound directly to them 4 to 8 weeks after intraosseous implantation. On microradiograms, the interface between newly formed bone and LHAP-coated HAP was unclear. These results reveal that LHAP-coated HAP had high activity of osteoconduction, and connected with the newly formed bone. Therefore, it is concluded that LHAP-coated HAP is a very useful biomaterial for bone defects.
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  • Masako Yamazaki, Masahisa Inoue, Katsuhiko Hayashi, Yuzou Ishiwari, Ta ...
    1992 Volume 5 Issue 2 Pages 235-239
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    In order to study the validity of the rest implantation period for one-step dental implant,we studied the radiographic differences between dental implant with the rest implantation period of three months and that with temporary fixation just after the implantation surgery. Bioceram dental implants (Kyocera) were used in this study, and all cases of this study were performed by the same dentist. Bioceram implants with the rest implantation of three months showed no mobility after occlusal stress,and no radiolucent space around them. However, Bioceram implants with temporary fixation showed mild mobility and the radiolucent space around those implants. Results reveal that the rest implantation period is necessary to get a good prognosis for one-step dental implants.
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  • Part 4.Bonefit's PERIO TEST Values
    Hiroki Murakami, Kenji Matsuki, Yutaka Nishijima, Makoto Nakanishi, To ...
    1992 Volume 5 Issue 2 Pages 240-249
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    We reported about mobility of implants by PERIO TEST® (Part 1, 2) on SUMICIKON. We took many measurements of Bonefit bioinart implants with PERIO TEST® (PT) by the same method. PT revealed that a relation between an implant and a bone can be understood by individual observation at chairside.
    Our Bonefit implant dates were reliable statistics, because we measured 205 cases. We had some interesting results about some methods. Those results were as follows;
    1. Incisal lower edentulos arch use (n=19) PT average had the best level when compared to other methods.
    2. Self-standing use (n=29) PT average had a good level but was impossible to use clinically.
    3. Connected natural teeth and Molar lower arch use (n=113) was the most popular method in our experiments. The PT average was good. We thought, this method was safe and reliable.
    4. Connected natural teeth and Molar upper arch use (n=41) PT average was alright for clinical use. But standard deviation was not better than the other methods
    5. All experiments (n=205) PT average rose from immediate post operation to 30 days later. But it declined after 60 days later. The phenomenon was“ Tissue-integrate”.
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  • Part 3.Double Head Type of SUMICIKON
    Tamisuke Kishi, Hiroki Murakami, Takaaki Yamamoto, Jun Saitou, Katsuhi ...
    1992 Volume 5 Issue 2 Pages 250-255
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    In recent years, mobility of implants with PERIO TEST® have been performed often, but mobility of double head type implants with PERIO TEST® has not been reported. This time we report some interesting results from the study in the double head type implants SUMICIKON. The scores of PERIO TEST® in the mesial and distal sites were different at the time just after operation. With time lapse, both scores centered on the average and the centered score decreased in accordence with the healing. The different scores between the mesial and distal sites just after operation was considered due to the operator's technique, the state of alveolar bone and gingiva. The decrease of the centred score of PERIO TEST® was thought to be the biointegrate effect of SUMICIKON.
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  • Part 2. Stress Analysis by Two-dimensional Finite Element Method
    Masanobu Horiuchi, Masashi Miyamoto, Tetsuo Ichikawa, Yasuo Okamoto, Y ...
    1992 Volume 5 Issue 2 Pages 256-262
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    A two-piece apatite implant (APACERAM® 2-Piece Implant Type-S) can be used as a free-standing implant. We investigated the position and direction of the implant root by the 2-dimensional finite element stress analysis.
    Finite element models were three buccolingual section models of the left mandibular molars to which the implant root was inserted with different conditions. Loading condition was the vertical load of 100 N applied to a point on the occlusal table. And an equivalent stress distribution in the osseous supporting structure around the implant was analyzed in the models with the following conditions:
    Model 1: The long axis of the implant root agreed with that of the implant crown.
    Model 2: The long axis of the implant root was inclined lingually at an angle of 15° from that of the crown.
    Model 3: The long axis of the implant root was shifted 1.5 mm buccally from that of the crown.
    Results
    1. When a vertical load was applied to the center of the implant crown in Model 1(i.e.,the long axis of the implant root ran in the direction of the loading vector), high stress concentrated in the cortical bone around the implant neck; and stress was distributed along the cortical bone. Accordingly as the loading point was shifted from the center to the lingual side, the stress was increased within the lingual bone around the implant, but decreased within the buccal bone around it.
    2. In Model 2 (i.e., the long axis of the root was inclined lingually from the loading vector), high stress concentrated in the lingual cortical bone around the implant neck and in the buccal cortical bone contacting the implant base.
    3. In Model 3, (i.e., the long axis of the root was shifted buccally from the loading vector), high stress concentrated in the lingual cortical bone around the implant neck and in the buccal cortical bone contacting the implant base.
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  • Makio Ninomiya, Terunobu Ujiie, Toshiaki Ichihashi
    1992 Volume 5 Issue 2 Pages 263-268
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    Dental turbines operated by compressed air have been used not only in treatment of teeth such as in excavation, tooth support formation teech, or extraction of the dental pulp but also in operations such as difficult cases of tooth extraction, alveolar bone formation, root amputation, and bone marrow implantation.
    While sterile water is used in operations, the compressed air with which turbines are operated can be contaminated with dust and bacteria and it is considered that the measures to make the air should be used especially while conducting bone marrow implantation.
    Domnik-Hunter is a filter developed in England and has been used in air cleaners for polluted air and as air filters in factories. Recently filters with compressed air for dental use has been developed and proved to be very effective.
    Thus, we report examined turbine hoses with and without connection to Domnik-Hunter from a bacteriological viewpoint.
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  • Katsumi Uno, Masahiko Isogai, Katsuya Watanabe, Kou-ichi Naitoh, Masaa ...
    1992 Volume 5 Issue 2 Pages 269-273
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    Zirconia ceramics (ZrO2) show much higher strength and tenacity than other ceramics,and they are being studied as materials for dental implants.
    In the present study,compounds of ZrO2 and HAP were prepared,and their mechanical strength and biocompatibility were investigated.
    HAP was added to ZrO2 in proportions of 30, 50, 70, 80, and 90 Wt.% and the mixture was sintered at 1,500℃.These five compounds were used in the experiments. HAP sintered at 1,200℃ was used as the control.
    In these experiments,the hardness was measured by the Vicker's hardness method and the tissue reaction was observed by embedding the material in the femur of dogs.
    The Vicker's hardness decreased while more HAP was added. However, the difference in hardness between the compound containing 30 Wt.% HAP (560 HV) and that containing 50 Wt.% HAP (529 HV) was less than in other cases.
    The full circumference of compounds containing 50 Wt.% HAP or more was completely covered by mature bone.
    These results indicated that material containing 50 Wt.% HAP is useful for dental implants.
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  • Masahiro Iwata, Katsumi Nishijima, Shin Takagi, Teruhiro Kayano, Takao ...
    1992 Volume 5 Issue 2 Pages 274-278
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    In recent years, some biomaterials have been widely used in dental and oral surgery fields. Many persons have reported and investigated about the indication of implants. Many cases work well, but a few cases do not. Particularly in the maxilla, the indication of implants is very difficult.
    The authors experienced a case which had received utilization of implants in the maxilla and followed by right maxillary sinusitis.
    The purpose of this study is to show a concept of the use of implants in the maxilla.
    The patient was a 47-year-old male who had received utilization of endosseous implants in the right maxilla and followed by right maxillary sinusitis. He was treated by removal of implants and sinectomy.
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  • Part 3 A New Insertion Technique of Fixture and Its Evaluation
    Masashi Miyamoto, Tetsuo Ichikawa, Yasuyuki Horisaka, Yasuo Okamoto, M ...
    1992 Volume 5 Issue 2 Pages 279-285
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    We developed a new insertion technique of fixture for Apatite 2-Piece Implant with the idea that the proper implant placement is essential for both the prosthetic design and long-term prognosis. This paper presents the new technique and its efficiency.
    The technique is as follows: About one month before the fixture placement, the pilot hole (PH) with a diameter of 1 mm is made in the bone using a pesso reamer and a diagnostic denture. The direction and site of the PH is defined as the long axis and the center of the artificial tooth which is arranged in the denture. Upon surgical operation of the fixture placement, the trephin guide pin is inserted into the PH and the trephin bur is inserted onto the head of the pin. Anyone, even a beginner, can form the proper implant channel without any trouble by our technique. It was validated by the simulation experiment that the technique was efficient for the precision in the implant placement.
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  • Shigeo Osato, Masayoshi Osato, Iwao Kuroyama, Michio Okada, Tsutomu Ya ...
    1992 Volume 5 Issue 2 Pages 286-295
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    For the purpose of measuring the grayed degree in X-ray films, the evaluation of the subject has been conducted by the digital image processing (DIP) method utilizing high accuracy of aluminum steps and slopes for the calibration of the DIP system. The aluminum reference device must have a high dimensional accuracy and good reproducibility of nearly identical measurement values. The accuracy of this radiographic reference device was studied by comparatively measuring the aluminum thickness and equivalent values. The following are the results of this study.
    1. The comparison between the aluminum step's thickness and measured equivalent values, with the measurement taken using the steps of the device as a reference, found that the relative errors between them averaged 0.9%. This level of error was almost the same as the average relative error value of 1.0% obtained regarding the slopes of the reference device.
    2. A similar comparison between the aluminum slope's thickness and equivalent values produced an average relative error of 8.0%. On the other hand, a comparison between the aluminum step's thickness and equivalent values, when measurement was taken using the slope of the aluminum device as a reference, obtained a comparatively large average relative error of 9.3%, indicating poor accuracy of the device.
    3. The comparison of the length of DIP system manipulation time required before obtaining the standard curve values between the aluminum step and aluminum slope measurements found that the latter had a 50-second shorter time (p<0.01) than the former.
    4. However, it has been found that the aluminum step measurement is superior to the aluminum slope counterpart in measurement accuracy and the reproducibility of measured values.
    5. The aluminum step scheme makes it possible to conduct measurement under equivalent conditions even when measurement samples of different sizes are involved.
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  • Masaaki Goto, Takeshi Katsuki, Masaaki Koga, Eiro Kubota
    1992 Volume 5 Issue 2 Pages 296-304
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    Bone grafting often is necessary to reconstruct maxillary and mandibular bone defects.Although fresh autogenous bone is the standard by which other materials are judged,the surgical procedure for obtaining autogenous bone requires operative time.Moreover,the quantity of autogenous bone available may be inadequate.To avoid these problems,hydroxyapatite has been popular as an artificial bone due to its excellent biocompatability.We applied multiporous hydroxyapatite block to maxillary and mandibular defects.
    Hydroxyapatite blocks were placed within 55 defect sites:30 jaw cysts,12 alveolar cleft or deficient maxilla,and 13 sockets after dental extraction.The patient's ages ranged from 14 to 74 years.
    Healing was evaluated by inspection and radiographs.In 28 of the 30 jaw cyst and 9 of the 12 cleft palates cases,the grafted hydroxyapatites were stable one to six months postoperatively.However,complications such as infection or exposure of implant occurred in 9 of the 13 dental extraction cases.The causes of these failures were considered to be mucosal coverage insufficiency and periodontal infection prior to exodontia.
    Osseous repair by multiporous hydroxyapatite block showed the usefulness for the treatment of jaw cysts and cleft palate maxillary hypoplasia.
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  • ―Millipore Filter Method―
    Toshikuni Masukawa, Hiroyasu Nakazato, Seiho Fukuyo, Kiyoshi Tagawa, S ...
    1992 Volume 5 Issue 2 Pages 305-309
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    Little is known about the cytotoxic effects of Ti-Ni alloys. This study investigated the cytotoxicity of Ti-Ni alloy using the millipore filter method. Human epithelial cells (HeLa) suspended in MEM growth medium to a final concentration of 1.5×105 cells per ml were used. Millipore filter discs with a diameter of 47 mm and pore size of 0.45mm were covered with 6 ml of cell suspension and incubated for 24 hours at 37℃ in a humidified atmosphere of 5% CO2 in air. Test materials comprised of Ti-Ni,Ni,Ti,and asbestos, 7 mm in diameter which were 3.5 g or less in weight. The test procedures followed were those as described by WENNBERG et al. (1979). For control purposes, filters with monolayer of cells,without test specimens were included. Ten specimens for each test situation were used. After incubation, the filter was incubated for cytochemical demonstration of succinate dehydrogenase activity of the cell monolayer (BARKA and ANDERSON, 1963). The control filters were uniformly stained in a dark blue color while the test samples were scored as:(1)Ti-Ni-O (no difference in staining intensity as compared to the control; (2)Ti-O; (3)Ni-I (unstained zone had a diameter less than 7 mm); (4)Asbestos-3(unstained zone was greater than 12 mm wide). Based upon the results of this study, both Ti-Ni and exhibit a non cytotoxic response while,Ni exhibits a mild cytotoxic response and asbestos a markedly cytotoxic response.
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  • Noriharu Ikumi, Maki Fukai, Touru Inoue
    1992 Volume 5 Issue 2 Pages 310-317
    Published: September 30, 1992
    Released: November 30, 2018
    JOURNALS FREE ACCESS
    To find the change of bone around the implants by year, we examined X-rays of the bone surrounding the implants (Oratronics: Standard and Generation-Ten) that had been installed in the mandibular molar region,and organized them into four basic classes. We examined dental X-rays of 367 cases of blade implants in the mandibular molar region. We found that the conditions of bone around the implants installed between teeth were better than those of the bone around the implants installed in the free-end portion.We also found that the conditions of the bone around the implants (Generation-Ten) were better than those of the bone around the implants (Standard).
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