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Apatite 2-
Piece
Implant

第1報歯根部移植試験

小木曾誠, 相川修二, 田端恒雄, 一條尚, 日高恒夫

日本補綴歯科学会雑誌
1987年 31 巻 6 号 1522-1530
発行日: 1987/12/01
公開日: 2010/08/10

DOI https://doi.org/10.2186/jjps.31.1522

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For making apatite implant easy to use clinically and characteristics of apatite being bony-ankylotic surely exhibit, the implant was devised so as to consist of the root portion to be embedded completely in bone under periosteum at the first operation and the abutment portion to be cemented to the root portion after excising corresponding mucosa after bone healing. Developed 2-
piece
implant is formed of the root portion having both the dense apatite outer tube and titanium-made flanged inner tube, being attached to each other with finepowdered apatite filled-cement through heat polymerization, and the titanium-made abutment portion. 2-
piece
implants were implanted in adult dog lower jaw bone for two weeks, five months and ten months, respectively, for evaluation of the tissue around the root portion.
Result:
1. On almost apatite surfaces of root portion, bone formed, and after five months of implantation, root portion and jaw bone were in a state of being united.
2. It was found that both the slight resin cement existing between the titanium flange forming the root portion top surface and the apatite outer tube and the titanium flange were harmless to the around tissue and did not inhibit the bony ankylosis of apatite part.
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Clinical and radiographic performance of one-
piece
and two-
piece
implant:a systematic review and meta-analysis

Mengqi Liu, Lulu He, Hang Wang

Journal of Prosthodontic Research
2021年 65 巻 1 号 56-66
発行日: 2021年
公開日: 2021/02/24
[早期公開] 公開日: 2020/09/09

DOI https://doi.org/10.2186/jpr.JPOR_2019_436

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Purpose: The aim of this system review was to evaluate clinical and radiographic performance of one-
piece
implant (OPI) and two-
piece
implant (TPI).
Methods: Electronic database searches were performed in MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials and OpenGrey databases up to May 2019. Two authors individually screened the related literatures according to the inclusion and exclusion criteria. Main clinical outcomes included failure and complication rates. Radiographic outcomes were peri-implant bone loss between baseline and last available follow-up.
Results: Finally, 11 articles reporting 10 different studies were included in this review. No statistically significant difference (P = 0.22) in risk of failure was found between the two types of implants (RR: 0.49, 95% CI: 0.16-1.53). Peri-implantitis accounted for most failures and complications and there was no statistically significant difference in risk of peri-implantitis no matter after 1 year follow-up (RR: 1.15, 95% CI: 0.37-3.53, P = 0.81) or at 2-3 years (RR: 1.95, 95% CI: 0.23-16.63, P = 0.54). With regard to the marginal bone loss (MBL) around implants, subgroup meta-analysis by platform switching versus platform matching showed a significant MBL-reducing effect for TPI when compared to OPI (WMD: 0.21mm, 95% CI: 0.07-0.36mm, P = 0.004) in the platform-switching subgroup, while no significant difference in MBL was observed between the two groups in the platform-matching subgroup (P = 0.67).
Conclusions: The results of this review suggested that OPI and TPI showed similar short-term survival rates and incidences of complications. Nevertheless, TPI with platform switching may be a better option to reduce peri-implant bone loss.
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頸椎One
Piece
Cervical Deviceについて

三井弘, 高橋宏

脊髄外科
1993年 7 巻 103-107
発行日: 1993年
公開日: 2017/04/22

DOI https://doi.org/10.2531/spinalsurg.7.103

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Stress distribution of one-
piece
and two-
piece
mini-Implant overdentures with various attachment systems and diameters: A finite element analysis

Bui Ngoc Huyen Trang, Manabu Kanazawa, Natsuko Murakami, Noriyuki Wakabayashi, Tamaki Hada, Namano Sahaprom, Yuriko Komagamine, Shunsuke Minakuchi

Journal of Prosthodontic Research
2022年 67 巻 3 号 430-436
発行日: 2022年
公開日: 2023/07/31
[早期公開] 公開日: 2022/11/12

DOI https://doi.org/10.2186/jpr.JPR_D_22_00108

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Purpose: We investigated and compared the stress distribution within one- and two-
piece
mini-implants for overdentures with three different attachments (ball, Locator, and magnet) and two different diameters using three-dimensional finite element (3D FE) analysis and a monotonic bending test. The goal was to identify the most beneficial implant attachment system design for mini-implant overdentures with a lower risk of implant fracture.
Methods: Twelve 3D FE models simulating a mandible segment with one- and two-
piece
mini-implants with different attachment systems, diameters, and overdentures were created using three-dimensional computer-aided design (CAD) software. Vertical and oblique forces (45° to the longitudinal axis of the implant) of 100 N were applied to the dentures. The stress distribution was analyzed. A bending test was performed on a mini-implant (Locator, 2.4 mm) using a testing machine to quantify the load at yield stress.
Results: One-
piece
mini-implants showed lower maximum stress compared to two-
piece
mini-implants. Among the three designs, the magnet attachment systems showed the maximum stress. The maximum von Mises stress occurred at the neck of the implants, which was surrounded by cortical bone in all models, and under both loading conditions.
Conclusions: Focusing on the attachments and one- and two-
piece
designs of mini-implant overdentures using CAD models to reduce confounding factors affecting the stress distribution, we concluded that one-
piece
mini-implants tended to show lower stress compared to two-
piece
mini-implants. Mini-implant overdentures with Locator and ball attachments demonstrated lower stress within the implants compared to those with magnet attachments under vertical and oblique loading conditions.

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ボイラ用Transition
Piece
の研究

伊藤慶典, 石井謙一

溶接学会誌
1966年 35 巻 12 号 1228-1235
発行日: 1966/12/25
公開日: 2011/08/05

DOI https://doi.org/10.2207/qjjws1943.35.12_1228

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A transition
piece
used for super-heater tubes of power plants was made by friction weld holding an Inconel tube between an austenitic stainless steel tube and a 2.25 Ci-1Mo steel tube, them mechanical properties at room temperature of the tubular transition
piece
were examined and thermal cycle and creep rupture tests were carried out for practical use. The test results are as follows:
1. Welded joints (730°C S.R) made by friction weld showed satisfactory tensile and bending properties.
2. Under thermal stress by 230-650°C thermal cyclic heating and internal pressure, the tubular transition
piece
was ruptured within the 2.25 Cr-1Mo steel tube in every case.
3. In the creep rupture test at 650°C, the tubular transition
piece
was ruptured within the 2.25 Cr-1Mo steel tube.
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Patient satisfaction and crestal bone changes with one-
piece
and two-
piece
single implant-retained mandibular overdenture: A randomized controlled clinical study

Swati Singh, Sunil Kumar Mishra, Ramesh Chowdhary

Journal of Prosthodontic Research
2023年 67 巻 1 号 112-120
発行日: 2023年
公開日: 2023/01/06
[早期公開] 公開日: 2022/03/23

DOI https://doi.org/10.2186/jpr.JPR_D_20_00315

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Purpose: The present study was done to assess patient satisfaction and crestal bone changes with one-
piece
and two-
piece
single implant-retained mandibular overdentures (SIMOs).
Methods: The participants included in Group 1 (n=12) received one-
piece
SIMOs; the participants in Group 2 (n=12) received two-
piece
SIMOs.Scheduled follow-ups were done at 1 month and 1 year after implant placement. Patient satisfaction and crestal bone changes were evaluated. The data obtained were analyzed statistically with independent Student t-test.
Results: Visual analogue scale (VAS) score for patient satisfaction with one-
piece
and two-
piece
SIMOs were statistically significant at 1-year of follow-up. The patient satisfaction level on the VAS score increased (38.1 to 51.1) with group one-
piece
SIMOs and two-
piece
SIMOs (36.6 to 46.8) at baseline to 1 month (P=0.13). The patient satisfaction level increased (38.1 to 56.6) with group one-
piece
SIMOs and two-
piece
SIMOs (36.6 to 52.2) at baseline to 1 year (P=0.03). At the 1 year follow-ups, group 1 had mean crestal bone loss of 0.80 ± 0.49 mm and group 2 had 1.24 ± 0.90 mm (P=0.16). Crestal bone loss was greater in the two-
piece
SIMOs group at 1 month and 1 year follow-ups, but statistically it was insignificant.
Conclusions: One-
piece
SIMOs seemed to be a viable treatment option with increased patient satisfaction on a VAS. Crestal bone loss was greater in the patients with two-
piece
SIMOs during follow-up. One-
piece
SIMOs was comparatively simple with less invasive procedures and needed fewer components,so considerable number of patients requiring implant retained dentures could be benefited.

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On a
piece
of surface in a fibred space

Mariko Konishi

KODAI MATHEMATICAL SEMINAR REPORTS
1972年 24 巻 2 号 176-194
発行日: 1972年
公開日: 2009/01/21

DOI https://doi.org/10.2996/kmj/1138846520

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1ピース及び2ピース型歯科インプラント周囲骨における応力解析の検討

*大谷仁貴, 石原滉平, 原佳希, 橋本祐紀, 尾関和秀

茨城講演会講演論文集
2020年 2020.28 巻
発行日: 2020年
公開日: 2021/07/07

DOI https://doi.org/10.1299/jsmeibaraki.2020.28.102

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Dental implants have various structures such as one-
piece
type and two-
piece
type. Two-
piece
types are mainly classified tapered-joint type or butt joint type. The selection of implants is important in order to prevent bone resorption in the jawbone in prognosis of the dental treatment. The purpose of this study is to evaluate the difference in the mechanical effects on the jawbone caused by the difference in the structure of dental implants. As analysis models, three CAD models of simple jawbone, using one-
piece
type and butt-joint type, tapered-joint type, were made by CAD software. The lateral load of 35 N was applied to the artificial tooth, and stress analysis was performed by FEM. The principal stress in the bone around the implant and in the implant were evaluated. In the result of analysis, the magnitudes of tensile stress and compressive stress caused by one-
piece
type in the cortical bone were almost the same. In the compressive stress, the magnitude of butt-joint type was 1.57 times that of one-
piece
type and that of the tapered-joint was 1.67 times that of the one-
piece
type.
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DESIGN OF A LOADED FILTER AND MULTILAYERED SAND COLUMN

田中勉, 吉良八郎, 長谷川高士

土質工学会論文報告集
1982年 22 巻 3 号 92-108
発行日: 1982/09/15
公開日: 2008/02/29

DOI https://doi.org/10.3208/sandf1972.22.3_92

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A seepage failure problem of a
piece
-wise homogeneous sand column subjected to a vertically upward seepage flow is treated theoretically from the standpoint of design of a loaded filter (or an effective overburden pressure of a loaded filter) which is placed on the top of the sand column. Specifically, a five-layered sand column which is a typical example of the general multi-layer case is considered. The critical state chart for seepage failure of the five-layered sand column is obtained by using an analytical method developed by the authors. This chart indicates almost all the information about seepage failure of the sand column : the mode of failure of the sand column, the stability of the sand column in its critical state, the state within the sand column, the effects of a loaded filter, the safety factor for seepage failure of the sand column, and so on. Thus it is concluded that, in a seepage failure problem of a
piece
-wise homogeneous sand column (or, in design of a loaded filter which is placed on the top of the sand column), to obtain the critical state chart of the sand column is most important.
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3種類の単焦点眼内レンズの白内障術後の前房深度と屈折変化の比較

石田秀俊, 三田哲大, 渋谷恵理, 山崎舞, 伊井彩, 鵜飼祐輝, 高山綾子, 柴田奈央子, 久保江理, 佐々木洋

日本白内障学会誌
2020年 32 巻 1 号 58-62
発行日: 2020年
公開日: 2020/07/08

DOI https://doi.org/10.14938/cataract.12-013

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目的：3種類の形状の異なるシングルピースの眼内レンズ (IOL) における術後前房安定性について検討した. 対象および方法：対象はSN60WF (日本アルコン), ZCB00V (Johnson and Johnson), NS-60YG (ニデック) のいずれかのシングルピース単焦点IOLを挿入し, 術後3カ月以上経過した64例104眼とした. 術後1週, 1, 3カ月目に前房深度と屈折値を測定した. 結果：等価球面度数の変化は3種類のレンズ間でどの期間においても有意差はなかった. SN60WF群の前房深度は全期間を通して有意な変化はなかった. 術後1カ月から3カ月でZCB00V群の前房深度が有意に深くなった. 術後1週から1カ月での前房深度変化が±0.3mm以上の割合は, NS-60YGがSN60WFと比べて有意に多かった. 結論：3種類のシングルピース単焦点IOL挿入術後の前房深度の経時的変化を比較した結果, 種類によって術後早期の前房深度変化量は異なっていた. 術後早期には, 前房深度の変化量が少ないSN60WFはもっとも術後屈折安定性がよく, NS-60YGは安定性が低い可能性がある.

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Endo用ツイストコントラについて

初谷宏一

日本臨床歯内療法学会雑誌
1996年 17 巻 1 号 80-81
発行日: 1996年
公開日: 2019/06/30

DOI https://doi.org/10.20817/jeaj.17.1_80

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Abstract : Recently, I developed a twist contra-angle of repeated motion with 30° based on a technique of original super file, a kind of k-file, used by installing in a twist contra-angle which I had developed about ten years ago under manufacturer's aid.
The angle of ordinary twist contra-angle is too wide for preparation of root canal, and furthermore, in some cases, it is inadequate. After trial and error, I found that the change of angle of twist motion (repeated motion) from 90° to 30° and use of the super file resulted in easy preparation of root canal, and this was well accepted by lots of dentists. This report shows its details.

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Apatite 2-
Piece
Implant第3報臨床治験について

小木曾誠, 金田浩之, 塩田真, 三羽敏夫, 和久田尚, 相川修二, 魚島勝美, 益田高行, 金田亮二, 富塚健, 石原秀一郎, 田端恒雄, 杉本裕史, 神林秀昭, 松本重之, 上原和美, 日高恒夫

日本補綴歯科学会雑誌
1988年 32 巻 3 号 523-533
発行日: 1988/06/01
公開日: 2010/08/10

DOI https://doi.org/10.2186/jjps.32.523

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For making the apatite implant easy to apply clinically, the 2-
piece
apatite implant divided into the root portion and the abutment portion was developed, and at the Tokyo Medical and Dental University hospital it was put to the clinical trial.
Result:
1. During two years from August, 1984 to August, 1986, 310 pieces of the 2-
piece
implant were applied in 86 cases.
2. As of December, 1987, 299 pieces (96.5%) of the implants applied are uneventful under a normal functional condition.
3. If the bone structure in the corresponding areas is maintained in a favorable condition, the 2-
piece
implant is applicable in almost all areas of the jaws, thus having a remarkably expanded application scope as compared with the socalled 1-
piece
implant, that is, the former type implant.
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Dually-Perturbed Matsumoto-Imai Signature (DPMS) Scheme

Masahito GOTAISHI, Kohtaro TADAKI, Ryo FUJITA, Shigeo TSUJII

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
2010年 E93.A 巻 6 号 1078-1085
発行日: 2010/06/01
公開日: 2010/06/01

DOI https://doi.org/10.1587/transfun.E93.A.1078

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A new signature scheme of MPKC is proposed. It is created by perturbing a traditional encryption scheme in two ways. The proposed perturbation polynomials successfully reinforce the Matsumoto-Imai cryptosystem This new signature scheme has a structure very difficult to cryptanalyze. Along with the security against algebraic attacks, its security against existing attacks is discussed. The experimental data imply that the scheme can create a both lightweight and secure signature system.
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Orbitozygomatic approachの基本とピットフォール

後藤剛夫, 大畑建治

脳神経外科ジャーナル
2015年 24 巻 11 号 738-744
発行日: 2015年
公開日: 2015/11/25

DOI https://doi.org/10.7887/jcns.24.738

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Orbitozygomatic approachは広く普及した頭蓋底到達法であるが, 広く普及したがゆえに, 手術の細かなコツあるいは適応について語られる機会が減少している. 今回は手術解剖の知識を中心に同到達法を行う手順を解説した.
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High Speed Elongation of Long Test-
Piece
of Rubber

Shin-ichi Hyodo

Journal of the Physical Society of Japan
1953年 8 巻 4 号 563-565
発行日: 1953年
公開日: 2007/05/29

DOI https://doi.org/10.1143/JPSJ.8.563

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Fatigue Strength of Induction-Hardened Test-
Piece
with Crack

Hiroshi NAKAMURA, Tatsuo AMAKASU, Shiro UEDA

Bulletin of JSME
1958年 1 巻 3 号 227-232
発行日: 1958年
公開日: 2008/02/20

DOI https://doi.org/10.1299/jsme1958.1.227

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One of the reasons why the fatigue limit remarkably rises in the notched specimen of steel which is induction-hardened, is that, the cracks produced do not propagate any further. In this connection, some experiments on rotary bending were made with the specimens of a plain carbon steel with 0.18%C, some of which are ordinary plain specimens and others have some crack, both were tested for two cases, ie. non-heat treated and induction-hardened. The results are as follows : (1) without any heat treatment fatigue limit a) ordinary plain specimens 20 kg/mm² b) specimens with some crack 10 kg/mm² (2) induction hardened a) ordinary plain specimens 54 kg/mm² b) specimens with some crack 48 kg/mm² The reduction rate of the crack is apparently less in the latter than in the former, which is less hardend. To explain this seemingly contradictory fact, Prof. Ishibashi's opinion has been applied that the tip of crack must be subjected only to tension stress during rotating bending tests.
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The Years A Conversation
Piece
: 晩年のRoger Fryの美学に思うこと

福島比呂子

ヴァージニア・ウルフ研究
1984年 1 巻 46-55
発行日: 1984/03/25
公開日: 2017/07/08

DOI https://doi.org/10.20762/woolfreview.1.0_46

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The Wavesの出版後7年間のブランクをおいて世に出たThe YearsにはVirginia Woolf第二番目の転機が読みとれる。ここでは作家Woolfのこの転機の意味をThe Yearsの内包する矛盾に探り,それをBloomsbury Groupの友人Roger Fryの美学との対比において考えてみたい。
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Apatite 2-
Piece
ImplantのX線学的検討

2報　埋入後2年間の観察

市川哲雄, 宮本雅司, 堀坂寧介, 岡本康生, 堀内政信, 松本直之, 岩崎裕一, 吉田秀夫

日本口腔インプラント学会誌
1993年 6 巻 2 号 327-333
発行日: 1993/09/30
公開日: 2018/08/31

DOI https://doi.org/10.11237/jsoi.6.327

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The progress of patients treated with the 2-
piece
hydroxyapatite implant (Apaceram® 2-
Piece
Implant, Pentax, Tokyo, Japan) in our clinic has been followed regularly by a standardized radiograph and digital image processing. The radiological examination, which has been demonstrated in this journal by us, is useful for evaluating quantitative bone changes after the implant placement. We observed chronological changes of both marginal bone height and bone density around the implant about two years after the implant placement.33 Apaceram implants were placed in the mandibular molar regions in 13 patients. The mean follow-up period was three years.
1. With regard to chronological changes of marginal bone height, the radiographic results were divided into three groups:type I in which the position remained constant or increased with time course, type II in which the position decreased gradually after the superstructure placement, and type III in which the position decreased rapidly after the abutment placement. The mean changes of the bone height in the Groups I, II, and III amounted to 0.1 mm, -0.4, and -2.4 mm/year, respectively.
2. Bone density around successful Apaceram implant increased clearly. The aspect looked like the bird wing between the implant. The degree of bone change during several months after the abutment placement was larger than that of both during one year after the period and during 6 months after the fixture placement. The lower preoperative bone density was, the more bone density increased.
We evaluated the above results as radiological examination for two years after the implant placement. Our results indicated that the bone resorption/formation around the implant might be related in the occlusal force, and adequate occlusal force should be produced on the implant during each phase following the implant placement.

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Security Enhancement of Various MPKCs by 2-Layer Nonlinear
Piece
in Hand Method

Shigeo TSUJII, Kohtaro TADAKI, Ryou FUJITA, Masahito GOTAISHI, Toshinobu KANEKO

IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
2009年 E92.A 巻 10 号 2438-2446
発行日: 2009/10/01
公開日: 2009/10/01

DOI https://doi.org/10.1587/transfun.E92.A.2438

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Following the last proposal of the nonlinear
Piece
in Hand method, which has 3-layer structure, 2-layer nonlinear
Piece
in Hand method is proposed. Both of them aim at enhancing the security of existing and future multivariate public key cryptosystems. The new nonlinear
Piece
in Hand is compared with the 3-layer method and PMI+, which was proposed by Ding, et al.
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上衣と下衣の対比印象度及び感性評価に対する柄の大きさや色彩の与える影響

髙石耕平, 今津果歩子, 藤本純子, 石川智治, 奥田紫乃, 阿山みよし

日本色彩学会誌
2019年 43 巻 3+ 号 97-
発行日: 2019/05/01
公開日: 2019/07/06

DOI https://doi.org/10.15048/jcsaj.43.3__97

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本研究では上衣と下衣の対比印象の強さを「コントラスト・インパクト」と呼び，同じ印象の強さとなる無彩色刺激の輝度比でその定量化を行う．さらに感性評価及び柄の大きさや色との関係を明らかにすることを目的とする．
呈示刺激としてシンプルなブラウスの上衣とスカートの下衣をミニボディに着せたものを用いた．花柄の布地は黒，赤，黄，緑，青系の大きい花柄，黒系の中，小サイズの花柄の計7種類，無地は白，グレイ1，グレイ2，黒（明度は9.5，7，4，1.5程度）の4種類を使用した．テスト刺激としては，上衣は花柄の7種類，下衣は無地の4種類を組み合わせた28種類を，対比印象の強さの尺度化用の対比刺激としては，上衣・下衣とも無地の4種類を上下同色となるものを除いて組み合わせた12種類を用いた．テスト刺激のコントラスト・インパクトを求めるための対比印象比較実験及びテスト刺激に対して6種の評価語を用いた感性評価実験を生活科学系と工学系の女子学生各5名の計10名で行った．
無彩色の組合せと有彩色を含む組合せで別々に解析したところ，無彩色・有彩色の組合せ各々において，いくつかの感性評価語との間に強い相関が見られた．

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