TOHOKU UNIVERSITY Researchers

Details of the Researcher

Home

日本語 English

Ryuji Shigemitsu

Section

Graduate School of Dentistry

Job title

Senior Assistant Professor

Degree

D.D.S., Ph.D (Tohoku University)

researchmap

https://researchmap.jp/7000009959

J-GLOBAL ID

201401020124030675

Profile

Certified Prosthodontic Instructor and Specialist,
Japan Prosthodontic Society (JPS)

Certified Pain Manager,
Japan Pain Foundation

Clinical Operations Manager, Department of Oral Rehabilitation,
Tohoku University Hospital
(April 2016 – February 2019)

Administrative Manager, Center for Dental Implants,
Tohoku University Hospital
(April 2024 – March 2025)

Accredited Examiner for the Objective Structured Clinical Examination (OSCE)
in Postgraduate Dental Clinical Training

Accredited Examiner for the Clinical Assessment in Postgraduate Dental Training

Certified Dental Instructor for Clinical Residency

Research History 8

2025/04 - Present

Tohoku University Graduate School of Dentistry　Assistant Professor（Senior Lecturer）
2024/04 - 2025/03

Tohoku University Hospital　Dental Hospital Dental Implant Center　Assistant Professor
2023/04 - 2024/03

Aalborg university　Guest researcher JSPS international joint research enhancement project
2021/04 - 2024/03

Tohoku University Hospital　Dental Hospital Advanced Prosthetic Dentistry　Assistant Professor
2019/02 - 2021/03

Aalborg University　Department of Materials and Production, The AnyBody Research Group　Guest researcher
2016/04 - 2019/03

Tohoku University Hospital　Dental Hospital Advanced Prosthetic Dentistry　Assistant Professor
2012/11 - 2016/03

Tohoku University Hospital　Assistant Professor
2008/05 - 2012/10

Tohoku University Hospital　Clinical Fellow

Show all Show first 5

Education 2

Tohoku University　Graduate School　Advanced Prosthetic Dentistry

2004/04 - 2008/03
Tohoku University　Faculty of Dentistry

1998/04 - 2004/03

Professional Memberships 4

日本顎関節学会
日本口腔顔面痛学会
JAPANESE SOCIETY OF ORAL IMPLANTOLOGY
JAPAN PROSTHODONTIC SOCIETY

Research Interests 4

Prosthodontics
Musculoskeletal Simulation
Finite Element Analysis
Biomechanics

Research Areas 3

Informatics / Biological, health, and medical informatics /
Life sciences / Biomedical engineering /
Life sciences / Prosthodontics /

Awards 4

HIMAWAN AWARD

2024/07　133rd Annual Meeting of the Japan Prosthodontic Society/14th Biennial Congress of the AAP　PCA-based kinematic classification of mandibular movements from TMD patients
BioMedLib The Top 20 Articles Published on the Same Topic

2016/08/16　BioMedLib
Oral presentation competition Excellence Award

2008/05　The 117th Annual Meeting of the Japan Prosthodontic Society　Finite element analysis for interosseous stress with implant overdenture.
第115回学術大会課題口演コンペティション優秀賞

2006/07　日本補綴歯科学会　オーバーデンチャー支台インプラント荷重の三次元解析システムの開発とその生体内応用

Papers 44

One-year marginal bone loss and survival rate of triangular-neck dental implants: a systematic review and meta-analysis. International-journal Peer-reviewed

Ziqi Xie, Sara Reda Sammour, Ryuji Shigemitsu, Nobuhiro Yoda, Toru Ogawa

International journal of implant dentistry　2026/07/11

DOI： 10.1186/s40729-026-00702-5 　

More details Close

PURPOSE: This systematic review aimed to evaluate the clinical performance of dental implants with a triangular neck, focusing on 1-year marginal bone loss (MBL) and implant survival rate. METHODS: This review was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A comprehensive search of databases (PubMed, Scopus, and Web of Science) was completed on June 8, 2025. Randomized controlled trials (RCTs), retrospective and prospective studies, and case series that studied ≥ 10 implants, reporting on triangular-neck implants, were included. The Cochrane risk of bias 2 tool was used for RCTs, and the Joanna Briggs Institute case series checklist was used for nonrandomized studies. The results were summarized using a random-effects meta-analysis and sensitivity analysis was performed to assess robustness. The Grading of Recommendations Assessment, Development, and Evaluation (GRADE) method was used to determine the certainty of evidence. RESULTS: The search provided 115 titles after removal of duplicates. Eight studies met the inclusion criteria, five of which provided sufficient data for quantitative synthesis. The pooled analysis demonstrated a 1-year mean MBL of 0.35 mm (95% confidence interval [CI]: 0.24-0.46; heterogeneity; I2 = 23.2%; p = 0.25) and an implant survival rate of 97.8% (95% CI: 95.4%-99.4%; I2 = 0.0%; p = 0.96). CONCLUSIONS: Available single-arm evidence indicates that triangular-neck implants were associated with high implant survival rates and limited marginal bone level changes during the first year of follow-up. However, the current evidence does not permit conclusions regarding comparative clinical benefits relative to other implant designs.
Effects of Food Characteristics on Masticatory and Swallowing Functions in Healthy Young Adults Peer-reviewed

Rie Koide, Toru Ogawa, Hiroyasu Kanetaka, Taichi Narihara, Hideya Komine, Ryo Tagaino, Ryuji Shigemitsu, Kenta Shobara, Hiroki Hihara, Nobuhiro Yoda

Journal of Texture Studies　2026/04

DOI： 10.1111/jtxs.70078 　

ISSN： 0022-4901 1745-4603

More details Close

<jats:title>ABSTRACT</jats:title> <jats:p>Beyond oral function, the physicochemical properties of food, such as acidity and hardness, significantly influence nutritional intake. Clarifying the relationship between subjective and objective metrics for assessing oral function can help establish simple methods for selecting food with safe and suitable properties tailored to individual oral functions. To objectively and subjectively evaluate the chewing and swallowing processes of gummies with varying hardness and acidity in healthy young adults and to examine relationships between subjective and objective evaluation metrics. Ten healthy young adult men (mean age: 29.8 ± 3.6 years) with no history of oral hypofunction or dysphagia were included. Participants chewed and swallowed four types of gummies (hard with acid, hard without acid, soft with acid, and soft without acid) at their own pace. The subjective evaluation included sensory assessment of chewing and swallowing. Objective evaluations included electromyographic analysis of masticatory and swallowing‐related muscles and analysis of the food properties of gummies that were spat out just before swallowing. Correlations between subjective and objective evaluation metrics were assessed using Peason's correlation analysis. The physical properties and acidity of food significantly affected muscle activity and sensory evaluations of masticatory and swallowing functions. Hard gummies, particularly those without acidity, showed significantly greater masseter and temporalis muscle activity, a higher number of chewing cycles, and longer chewing time than soft gummies. In contrast, no significant differences were observed in swallowing‐related muscle activity or swallowing duration among the gummy types. Furthermore, strong correlations were observed between subjective evaluations and mastication‐related objective parameters, whereas correlations with swallowing‐related metrics were limited. Differences in food hardness caused by the presence or absence of acidity affected the masticatory and swallowing functions of healthy young adults. Furthermore, we identified a relationship between subjective and objective evaluations. Our findings provide fundamental data for investigating the effects of food physical properties on sensory evaluation, mastication, and swallowing functions.</jats:p>
Microwave-Assisted Nitriding of Titanium Alloy Forms a Graded Titanium Nitride Surface with Enhanced Hardness and Preserved Gingival Fibroblast Cytocompatibility Peer-reviewed

Akiyo Ito, Jun Fukushima, Ahmed Sammour, Sara Sammour, Aya Ito-Shibamoto, Rio Kawaguchi, Guang Hong, Kaori Takahashi, Takashi Yoshida, Ryuji Shigemitsu, Hirotsugu Takizawa, Keiichi Sasaki, Toru Ogawa

2026

DOI： 10.2139/ssrn.7232898 　
Anomaly detection of screw loosening of different implant-abutment connection designs using resonance frequency analysis: An in vitro study Peer-reviewed

Sara Reda Sammour, Hideki Naito, Ryuji Shigemitsu, Ziqi Xie, Tomoyuki Kimoto, Keiichi Sasaki, Nobuhiro Yoda, Toru Ogawa

The Journal of Prosthetic Dentistry　2026/01

DOI： 10.1016/j.prosdent.2025.12.007 　
Piezo1遺伝子活性化は機械的刺激下での骨形成とインプラント統合を促進する(Piezo1 Gene Activation Enhances Osteogenesis and Implant Integration Under Mechanical Stimulation)

Hu Longshuang, 根本昌代, Xie Ziqi, 天雲太一, 重光竜二, 小川徹, 鈴木治, 依田信裕

日本補綴歯科学会誌　17　(東北・北海道支部学術大会特別号)　29-29　2025/09
Publisher: (公社)日本補綴歯科学会
ISSN： 1883-4426

eISSN： 1883-6860
Piezo1の強制発現による機械刺激応答を介した骨形成

根本昌代, 天雲太一, 重光竜二, 鈴木治, 小川徹, 依田信裕

日本補綴歯科学会誌　17　(特別号)　182-182　2025/05
Publisher: (公社)日本補綴歯科学会
ISSN： 1883-4426

eISSN： 1883-6860
Kinematic classification of mandibular movements in patients with temporomandibular disorders based on PCA Peer-reviewed

Ryuji Shigemitsu, Toru Ogawa, Emika Sato, Anderson Souza Oliveira, John Rasmussen

Computers in Biology and Medicine　184　109441-109441　2025/01
Publisher: Elsevier BV
DOI： 10.1016/j.compbiomed.2024.109441 　

ISSN： 0010-4825

More details Close

Highlights •Application of FT, PCA and K-means to analyze mandibular kinematics in TMD. •Introduction of a novel method for tracking temporal changes in mandibular movements during treatment. •Enhanced reliability and functionality in the assessment of mandibular movements. Abstract This retrospective study aimed to kinematically classify mandibular movements collected during Temporomandibular Disorders (TMD) treatment, employing Fourier transformation (FT), Principal Component Analysis (PCA), and K-means clustering (k-means), and to investigate their correlation with symptoms of pain-related TMD. The study included five TMD participants diagnosed with myalgia (age: 39–86 years, with an SD of 18.96) and three healthy participants (age: 32–42 years, with an SD of 5.13) with no stomatognathic problems. TMD participants underwent tailored treatment for their symptoms, and their maximum unassisted mouth opening (MMO) was recorded randomly with a motion capture system (ARCUS digma II, Kavo, Biberach, Germany) at multiple time points. MMO for healthy participants served as a control. The dataset comprising 28 trials, was transferred to the AnyBody Modeling System (AnyBody Technology, Aalborg, Denmark) to extract joint angle time series, which were then transformed into Fourier series. Subsequently, PCA and k-means clustering were conducted. Two clusters were identified: Cluster 1, predominantly composed of symptomatic trials, and Cluster 2, mainly consisting of asymptomatic trials. Distinct transition pathways between the clusters were observed among participants, corresponding to the alleviation of pain-related symptoms during TMD treatment. These findings suggest that this approach has potential as an effective tool for diagnosing and assessing TMD by identifying symptomatic kinematic patterns and tracking temporal changes in mandibular movement. Despite the small dataset, these results suggest promise for a novel functional assessment method for TMD based on kinematic features.
Classification of Jaw Movements from TMD Patients Based on PCA

Ryuji Shigemitsu, Takehiko Mito, Emika Sato, Toru Ogawa, Keiichi Sasaki, John Rasmussen

15th Annual Meeting of the Danish Society of Biomechanics　2023/11/24
Trends of new patients at the Tohoku University Hospital Oral Medicine Liaison Center Peer-reviewed

Tohoku University dental journal　39/40/41　(2/1-2/1)　52-53　2022/06
Publisher:
ISSN： 0287-3915
Cluster analysis based on muscloskeletal modeling Peer-reviewed

Ryuji Shigemitsu, Keiichi Sasaki, John Rasumussen

Proceedings of the 55th Annual Meeting of the Japanese Society of Medical and Biological Engineering　2021/12
Development of musculoskeletal simulation based on jaw movement measurement

Ryuji shigemitsu, Toru Ogawa, Keiichi Sasaki

Journal of the Japanese Society of Stomatognathic Function　28　(1)　14-15　2021/09
Publisher:
DOI： 10.7144/sgf.28.14 　

ISSN： 1340-9085

eISSN： 1883-986X
The effects of Bone Remodeling on Biomechanical Behavior in a Patient with an Implant-Supported Overdenture Peer-reviewed

Emika Sato, Ryuji Shigemitsu, Takehiko Mito, Nobuhiro Yoda, John Rasmussen, Keiichi Sasaki

Computers in Biology and Medicine　129　104173-104173　2021/02
Publisher: Elsevier {BV}
DOI： 10.1016/j.compbiomed.2020.104173 　

ISSN： 0010-4825
Simulation model of age-related bone density changes in the mandible Peer-reviewed

Hirokazu Gesso, Toshiyuki Ogasawara, Ryuji Shigemitsu, Keiichi Sasaki

Journal of Japanese Society of Bone Morphometry　31　(1)　1-12　2021
Publisher: 日本骨形態計測学会
ISSN： 0917-4648
Effect of peri-implant bone resorption on mechanical stress in the implant body: in vivo measured load-based finite element analysis. International-journal Peer-reviewed

Liu Bing, Takehiko Mito, Nobuhiro Yoda, Emika Sato, Ryuji Shigemitsu, Jian-Min Han, Keiichi Sasaki

Journal of oral rehabilitation　2020/09/23

DOI： 10.1111/joor.13097 　

More details Close

BACKGROUND: Research on resolving implant fracture is still gaining attention as it can be a serious treatment failure outcome. The implant fracture is likely to occur due to increased stress in implant body associated with peri-implant bone resorption. OBJECTIVE: This study aimed to investigate the relationship between degree of peri-implant bone resorption and stress distribution in implant body by using finite element analysis (FEA). METHODS: The magnitude and direction of loads on implants at the mandibular molar region were measured with 3D piezoelectric force transducers in a patient during maximal voluntary clenching, grinding, and tapping to obtain input for the FEA as the loading condition. Simplified finite element bone models were generated to simulate the six patterns of peri-implant bone resorption progression which the bone levels from implant platform were set at 0, 1, 2, 3, 4, and 5 mm. Three types of implants with different diameters (3.5, 4.0, and 5.0 mm), corresponding abutments and screws were created. FEA using the in vivo measured load was conducted to investigate how peri-implant bone loss affects stress distribution in the implant body. RESULTS: Loading condition affected stress distribution in the implant body. As bone resorption increased, von Mises stress in the implant body became larger, which was marked in smaller diameter implants, and this change was amply demonstrated when the bone resorption increased from 0 to 2 mm. CONCLUSION: The FEA demonstrated that as peri-implant bone loss increased, the magnitude of stress in the implant increased, especially in small diameter implants.
Musculoskeletal Modeling with Jaw Motion Data from a TMD Patient International-journal Peer-reviewed

Ryuji Shigemitsu, Keiichi Sasaki, John Rasmussen

Advances in Transdisciplinary Engineering　Vol.11　108-114　2020
Publisher: IOS Press
DOI： 10.3233/ATDE200015 　

More details Close

Temporomandibular disorder (TMD) is a prevalent dental disease in common with dental caries and periodontitis. The major symptoms of TMD are masticatory muscle pain, temporomandibular joint (TMJ) pain and impairment of jaw movement due to the pain and pathologic derangement of TMJs. However, there are few studies using TMD patient-specific motion data to drive the musculoskeletal model that can elucidate kinematic and biomechanical characteristics of the patient. The purpose of this study is to develop the workflow of musculoskeletal modeling of the mandible with jaw motion data obtained from a TMD patient. This involves the establishment of patient-specific boundary conditions representing the characteristics of the TMJ. The jaw motion of a TMD patient was recorded and used as an input for driving the model.
A Case of Occlusal Reconstruction using a Combination Splint Peer-reviewed

Shigemitsu Ryuji

Annals of Japan Prosthodontic Society　10　(4)　365-368　2018/10
Publisher: 公益社団法人日本補綴歯科学会
DOI： 10.2186/ajps.10.365 　

ISSN： 1883-4426

eISSN： 1883-6860

More details Close

ABSTRACT: The patient was a man aged 57 at his first visit. His occlusal contacts in the intercuspal position were unbalanced because of a partially edentulous dental arch and a scissors-bite. The final prosthesis was placed after stabilizing the occlusal posture with a maxillary occlusal splint, which was a treatment denture covering the occlusal surfaces of the remaining teeth. Discussion: Using the face-bow transfer and cross-mounting technique, the elements of temporary occlusion with the treatment denture were reflected in the final denture, which allowed the patient to achieve improved mastication efficiency and mouth-related QOL. Conclusion: In cases with unbalanced posture of the mandible, prior to installing the final prosthesis, it is important to establish occlusal support and stabilize the occlusal posture by a treatment denture.<br /> Key words: Scissors bite, Treatment denture, Cross-mounting technique, Masticatory efficiency, OHIP-14
パーソナルFEAを用いたインプラント義歯装着者の経年的骨形態変化に関する研究

佐藤愛美加, 重光竜二, 水戸武彦, 高橋宏彰, 依田信裕, 佐々木啓一

日本補綴歯科学会誌　10　(特別号)　241-241　2018/06
Publisher: (公社)日本補綴歯科学会
ISSN： 1883-4426

eISSN： 1883-6860
DevelopmentandProblemsofBiomechanicalStudyonImplantsBasedoninVivoMeasuredLoad Peer-reviewed

依田信裕, 依田信裕, 小山重人, 小山重人, 小川徹, 小川徹, 松舘芳樹, 松舘芳樹, 重光竜二, 川田哲男, 佐々木啓一, 佐々木啓一, 佐々木啓一

日本口腔インプラント学会誌　31　(2)　135-143　2018/06
Publisher:
ISSN： 0914-6695

eISSN： 2187-9117
顎骨不均質性を考慮したFEモデルによるインプラント義歯の生体力学的検討

佐々木啓一, 水戸武彦, 重光竜二, 依田信裕, 川田哲男

日本口腔インプラント学会誌　27　(4)　609-610　2014/12
Publisher: (公社)日本口腔インプラント学会
ISSN： 0914-6695

eISSN： 2187-9117
Biological-data-based finite-element stress analysis of mandibular bone with implant-supported overdenture Peer-reviewed

Ryuji Shigemitsu, Nobuhiro Yoda, Toru Ogawa, Tetsuo Kawata, Yoshinori Gunji, Yuki Yamakawa, Kiyohiro Ikeda, Keiichi Sasaki

Computers in Biology and Medicine　54　(1)　44-52　2014/11

DOI： 10.1016/j.compbiomed.2014.08.018 　

ISSN： 0010-4825

eISSN： 1879-0534
Examination of material inhomogeneity for peri-implant intraosseous stress. Peer-reviewed

Takehito Nakamura, Ryuji Shigemitsu, Takehiko Mito, NobuhiroYoda, Keiichi Sasaki

Tohoku University dental journal　33　(1)　22-31　2014
Publisher:
ISSN： 0287-3915
Stress distribution in the peri-implant bone with splinted and non-splinted implants by in vivo loading data-based finite element analysis International-journal Peer-reviewed

Ryuji Shigemitsu, Toru Ogawa, Tetsuya Matsumoto, Nobuhiro Yoda, Yoshinori Gunji, Yuki Yamakawa, Kiyohiro Ikeda, Keiichi Sasaki

Odontology　101　(2)　222-226　2013/07

DOI： 10.1007/s10266-012-0077-y 　

ISSN： 1618-1247 1618-1255
Study of Alignments of Dental Implants by FEM Analysis Considering Heterogeneity of Mandibular Bone Peer-reviewed

大塩雅人, 山川優樹, 重光竜二, 水戸武彦, 佐々木啓一

日本口腔インプラント学会誌　26　(2)　250-258　2013
Publisher: (公社)日本口腔インプラント学会
DOI： 10.11237/jsoi.26.250 　

ISSN： 0914-6695

eISSN： 2187-9117

More details Close

The distribution of stress in the jawbone during mastication is highlighted in this paper as an important index of the mechanical performance of dental implants. The objective of this paper is twofold. The first objective was to demonstrate the importance of considering the heterogeneity (spatial distribution) of the mechanical properties of jawbone in stress analysis. Next, the influence of the alignments of the implants on the peri-implant bone stress was examined using a finite element method (FEM) and numerical analysis model which reproduced the heterogeneity of the jawbone based on the spatial distribution of the bone density measured as CT data. For the former objective, numerical analyses of a finite element model of the mandible of a patient were conducted. Using CT data of this patient and taking into account the non-uniformity (spatial distribution) of bone density, we reproduced a patient-specific geometry and mechanical properties of the jawbone. In-vivo three-dimensional loads measured by instruments attached to the implants were used in the numerical analyses. As for the material properties of jawbone, we employed two models: a multi-value model that considers the inhomogeneity and spatial variability of mechanical properties of the bone, and a binary model with two discrete mechanical properties for cortical bone and cancellous bone. In the numerical analyses, a large difference in the stress distributions was observed between these two models. This demonstrates the insufficiency of the over-simplified binary model and the validity of the multi-value model that is closer to reality. The effects of the alignments of the implants were analyzed against the maximal voluntary clenching (MVC) load measured in the patient. As a result, peri-implant bone stress was found to be greatly reduced when the alignments of the implants were changed to match the direction of MVC load. It is suggested that such alignments are optimal. As more realistic loads, the loads measured while chewing peanuts were used for implants aligned in such optimal directions. For those loads, stress reduction was observed, especially when the loads had large magnitudes. Thus, we demonstrated the importance of accurate modeling of bone material properties and the alignments of implants in terms of the distribution of peri-implant bone stress.
有限要素解析による材料不均質な下顎骨モデルを用いたインプラント埋入方向の検討

大塩雅人, 水戸武彦, 依田信裕, 重光竜二, 佐々木啓一

日本口腔インプラント学会誌　25　(特別号)　205-205　2012/09
Publisher: (公社)日本口腔インプラント学会
ISSN： 0914-6695

eISSN： 2187-9117
インプラント周囲骨のストレス応答に及ぼす上部構造連結の影響 Peer-reviewed

上條達央, 重光竜二, 依田信裕, 郡司良律, 佐々木啓一

日本口腔インプラント学会誌　25　(3)　579-580　2012/09
Publisher: (公社)日本口腔インプラント学会
ISSN： 0914-6695

eISSN： 2187-9117
In Vivo三次元咬合力データに基づくインプラント補綴症例の生体力学的検討

依田信裕, 重光竜二, 小針啓司, 郡司良律, 孫堅, 川田哲男, 小川徹, 佐々木啓一

日本歯科医師会雑誌　65　(5)　668-668　2012/08
Publisher: (公社)日本歯科医師会
ISSN： 0047-1763
生体内荷重データを用いたFEA解析に基づくインプラント周囲骨内応力に関する検討

重光竜二, 松本哲哉, 水戸武彦, 依田信裕, 小川徹, 佐々木啓一

日本歯科医師会雑誌　65　(5)　668-668　2012/08
Publisher: (公社)日本歯科医師会
ISSN： 0047-1763
インプラント埋入方向が機能時の骨内応力に与える影響の分析

重光竜二, 依田信裕, 郡司良律, 小針啓司, 佐々木啓一

日本口腔インプラント学会誌　24　(特別号)　295-295　2011/08
Publisher: (公社)日本口腔インプラント学会
ISSN： 0914-6695

eISSN： 2187-9117
可撤性部分床義歯装着患者の残存歯歯周組織状態に対するメインテナンスケアの効果

冨士岳志, 花渕静, 小山重人, 依田信裕, 佐々木具文, 横山政宣, 小川徹, 塙総司, 佐藤奈央子, 重光竜二, 末永華子, 折居雄介, 赤塚亮, 白石成, 竹内裕尚, 佐々木啓一

日本補綴歯科学会誌　3　(特別号)　207-207　2011/05
Publisher: (公社)日本補綴歯科学会
ISSN： 1883-4426

eISSN： 1883-6860
可撤性部分床義歯症例の長期経過に関する後ろ向きコホート研究

冨士岳志, 小山重人, 依田信裕, 伊奈慶典, 佐々木具文, 羽鳥弘毅, 横山政宣, 塙総司, 佐藤奈央子, 重光竜二, 末永華子, 折居雄介, 赤塚亮, 白石成, 竹内裕尚, 佐々木啓一

日本補綴歯科学会誌　3　(1)　E29-E29　2011/01
Publisher: (公社)日本補綴歯科学会
ISSN： 1883-4426

eISSN： 1883-6860
後向きコホート調査による可撤性部分床義歯症例の長期経過 Peer-reviewed

冨士岳志, 小山重人, 依田信裕, 伊奈慶典, 佐々木具文, 羽鳥弘毅, 横山政宣, 小川徹, 塙総司, 佐藤奈央子, 重光竜二, 末永華子, 折居雄介, 赤塚亮, 白石成, 竹内裕尚, 佐々木啓一

みちのく歯学会雑誌　41　(1-2)　73-74　2010/12
Publisher: 東北地区歯科医学会
ISSN： 0385-0099
インプラント埋入方向による周囲骨の応力低減効果口腔内実測荷重に基づく有限要素解析

松本哲哉, 石井優, 重光竜二, 石川太郎, 山川優樹, 依田信裕, 川田哲男, 池田清宏, 佐々木啓一

日本補綴歯科学会誌　2　(1)　E11-E11　2010/01
Publisher: (公社)日本補綴歯科学会
ISSN： 1883-4426

eISSN： 1883-6860
可撤性部分床義歯の種類・設計に関する諸因子が残存歯列へ及ぼす影響

伊奈慶典, 小山重人, 依田信裕, 佐々木具文, 羽鳥弘毅, 横山政宣, 塙総司, 鈴木祐子, 佐藤奈央子, 重光竜二, 末永華子, 折居雄介, 冨士岳志, 佐々木啓一

日本補綴歯科学会誌　2　(1)　E17-E17　2010/01
Publisher: (公社)日本補綴歯科学会
ISSN： 1883-4426

eISSN： 1883-6860
The influenceof implant angle on stress distribution of mandibular bone at chewing cycle

T Matsumoto, T Ishikawa, R Shigemitsu, Y Ishii, Y Yamakawa, N Yoda, K Ikeda, K Sasaki

The Journal of Japanese Society of Stomatognathic Function　17　(2)　166-167　2010
Publisher: Japanese Society of Stomatognathic Function
DOI： 10.7144/sgf.17.166 　

ISSN： 1340-9085

eISSN： 1883-986X
有限要素法を用いた歯科インプラント義歯の顎骨内応力解析 Peer-reviewed

重光竜二, 松本哲哉, 石井優, 石川太郎, 依田信裕, 山川優樹, 池田清宏, 佐々木啓一

日本機械学会年次大会講演論文集　2010　(Vol.5)　2010
生体内測定に基づく上部構造の連結・非連結の支台インプラント荷重への影響

郡司良律, 依田信裕, 重光竜二, 川田哲男, 佐々木啓一

日本口腔インプラント学会誌　22　(2)　171-171　2009/06
Publisher: (公社)日本口腔インプラント学会
ISSN： 0914-6695
オーバーデンチャー支台インプラント荷重の生体内三次元解析

依田信裕, 重光竜二, 郡司良律, 川田哲男, 佐々木啓一

日本口腔インプラント学会誌　22　(2)　175-175　2009/06
Publisher: (公社)日本口腔インプラント学会
ISSN： 0914-6695
インプラント適用患者におけるFEA

重光竜二, 依田信裕, 郡司良律, 川田哲男, 佐々木啓一

日本口腔インプラント学会誌　22　(2)　175-176　2009/06
Publisher: (公社)日本口腔インプラント学会
ISSN： 0914-6695
Clinical Dentistry and Stomatognathic Biomechanics

21st　2009

ISSN： 1348-2920
Development of in vivo measuring system of the pressure distribution under the denture base of removable partial denture Peer-reviewed

Kei Kubo, Tetsuo Kawata, Hanako Suenaga, Nobuhiro Yoda, Ryuji Shigemitsu, Toru Ogawa, Keiichi Sasaki

JOURNAL OF PROSTHODONTIC RESEARCH　53　(1)　15-21　2009/01

DOI： 10.1016/j.jpor.2008.08.006 　

ISSN： 1883-1958

eISSN： 2212-4632
レスト設置形態と部分床義歯床下圧力分野生体内測定による検討

末永華子, 久保圭, 重光竜二, 依田信裕, 小川徹, 川田哲男, 佐々木啓一

日本顎口腔機能学会雑誌　14　(2)　108-109　2008/02
Publisher: 日本顎口腔機能学会
DOI： 10.7144/sgf.14.108 　

ISSN： 1340-9085
Investigation of mechanical behavior of mandibular bone with dental implants: A dental clinical support system Peer-reviewed

山川優樹, 田村崇, 重光竜二, 依田信裕, 末永華子, 川田哲男, 佐々木啓一, 池田清宏

日本計算工学会論文集(Web)　2008　(Paper No. 20080014)　2008

DOI： 10.11421/jsces.2008.20080014 　

ISSN： 1347-8826
可撤性部分床義歯装着患者における使用状況と残存歯歯周組織状態の経年的変化

門脇研司, 小山重人, 川田哲男, 佐々木具文, 羽鳥弘毅, 小川徹, 横山政宣, 久保圭, 塙総司, 伊奈慶典, 重光竜二, 末永華子, 鈴木祐, 加賀谷恵理, 木村幸平, 渡辺誠, 佐々木啓一

日本補綴歯科学会雑誌　51　(2)　385-385　2007/04
Publisher: (公社)日本補綴歯科学会
ISSN： 0389-5386
歯垢中のmutans streptococciのPCR法による検出について Peer-reviewed

熊谷崇, 重光竜二, 太郎丸毅, 鷲尾純平, 小関健由, 佐藤拓一, 高橋信博

東北大学歯学雑誌　22　(1)　54-54　2003/06
Publisher: 東北大学歯学会
ISSN： 0287-3915

Show all ︎Show first 5

Misc. 3

生体内荷重測定に基づくインプラント生体力学研究の発展と課題

依田信裕, 小山重人, 小川徹, 松舘芳樹, 重光竜二, 川田哲男, 佐々木啓一

日本口腔インプラント学会誌　31　(2)　135-143　2018/06
Publisher: (公社)日本口腔インプラント学会
ISSN： 0914-6695
有限要素解析を用いたインプラント機能時の動的力学挙動に関する研究

佐藤愛美加, 重光竜二, 水戸武彦, 依田信裕, 佐々木啓一

日本口腔インプラント学会学術大会抄録集　47回　P-2　2017/09
Publisher: (公社)日本口腔インプラント学会
部分床義歯粘膜面に加わる圧力の生体内多点同時測定

久保圭, 川田哲男, 南文将, 重光竜二, 末永華子, 依田信裕, 小川徹, 佐々木啓一

日本補綴歯科学会雑誌　50　(1)　141-141　2006/01
Publisher: (公社)日本補綴歯科学会
ISSN： 0389-5386

Books and Other Publications 4

Fostering Joint International Research_What Skills Do Researchers Develop Through Global Engagement? Medical–Engineering Collaboration with Aalborg University, Denmark

Ryuji Shigemitsu

Tohoku University　2026/07
Realtionship between occlusion and temporomandibular joint

Ryuji Shigemitsu Makiko Miyashita Keiichi Sasaki

2021/12
Possibility of paste-type alginate impression materials for joint impressions Evaluation and clinical application method of "GC Arrow Injection"

2021/05
パーシャルデンチャー治療失敗回避のためのポイント47 －診断・前処置・印象・設計・応急修理と術後管理の問題解決法－

木山朋美, 重光竜二, 小川徹, 長田純一, 佐々木啓一

クインテッセンス出版株式会社　2017/11

Presentations 52

The Future of Jaw Function Assessment Enabled by Digital Twins Invited

Ryuji Shigemitsu

14tn Seminar of Stomatognathic Function, Japanese Society of Stomatognathic Function　2026/08/29
Analyze jaw movement using a musculoskeletal model

Ryuji Shigemitsu

Tohoku University Graduate School of Dentistry – Lion Corporation Research Exchange Meeting.　2026/03/30
S-7 Regarding training evaluation in clinical training for dentists Invited

Ryuji Shigemitsu

Workshop for Training Supervisors in Dental Clinical Residency at Tohoku University Hospital　2026/02/22
Biomechanical simulations for clinical dentistry based on FEA

Ryuji Shigemitsu

Mini-symposium in DAAD-JSPS project Novel biomaterial for a bone tissue regeneration by mechanical stimulation　2025/01
PCA-based kinematic classification of mandibular movements from TMD patients

Ryuji Shigemitsu, Toru Ogawa, JohnRasmussen

The 133rd Annual Meeting of the Japan Prosthodontic Society/14th Biennial Congress of the AAP　2024/07/07
e-Poster Session Chairperson

Ryuji Shigemitsu

International Symposium for Interface Oral Health Science 2022　2022/01/15
Cluster analysis based on muscloskeletal modeling

Ryuji Shigemitsu, Keiichi Sasaki, John Rasumussen

2021/12/11
東北大学病院口腔内科・リエゾンセンターにおける初診患者の動向

庄司憲明, 千葉雅俊, 永井宏和, 佐藤しづ子, 菅原由美子, 小川徹, 重光竜二, 岩間亮介, 鈴木飛佳理, 工藤葉子, 安田真久, 水田健太郎, 田中恭恵, 山口哲史, 八幡祥生

第78回東北大学歯学会　2021/12/10
Muscloskeletal modeling based on jaw movement

Ryuji Shigemitsu, Toru Ogawa, Keiichi Sasaki

2021/06/26
Musculoskeletal modeling with jaw motion data from a TMD patient.

R Shigemitsu, K Sasaki, J Rasmussen

DigitalHumanModeling2020　2020/09/01
Inverse dynamics simulation based on jaw motion Invited

Ryuji Shigemitsu

Aalborg University Seminar on orthodontic biomechanics 2019　2019/09/04
Biomechanical Approach For Dental Problem Invited

Shigemitsu R

Aalborg University Biomechanics Seminar2018　2018/09/11
インプラント周囲骨吸収がインプラント体部に生じる応力に与える影響

依田信裕, 水戸武彦, 佐藤愛美加, 重光竜二, 佐々木啓一

日本口腔インプラント学会学術大会抄録集　2018/09
Sato E, Shigemitsu R, Mito T, Takahashi H, Yoda N, Sasaki K Biomechanical behavior with an implant-supported overdenture based on personalized FEA International-presentation

Sato E, Shigemitsu R, Mito T, Takahashi H, Yoda N, Sasaki K

96th General Session & Exhibition of the IADR　2018/08/30
Biomechanical behavior with an implant-supported overdenture based on personalized FEA.

Emika Sato, Ryuji Shigemitsu, Takehiko Mito, Keiichi Sasaki

96th General Session & Exhibition of the IADR　2018/08
生体内荷重測定に基づくインプラント生体力学研究の発展と課題

依田信裕, 小山重人, 小川徹, 松舘芳樹, 重光竜二, 川田哲男, 佐々木啓一

日本口腔インプラント学会誌　2018/06
パーソナルFEAを用いたインプラント義歯装着者の経年的骨形態変化に関する研究

佐藤愛美加, 重光竜二, 水戸武彦, 高橋宏彰, 依田信裕, 佐々木啓一

日本補綴歯科学会誌　2018/06
Morphorogical Analysis of Peri-implant Bone Remodeling.

H Takahashi, R Shigemitsu, M Iikubo, T Mito, E Sato, K Sasaki

The 9th Annnual Meeting of the Japan Academy of Digital Dentistry　2018/04/14
有限要素解析を用いたインプラント機能時の動的力学挙動に関する研究

佐藤愛美加, 重光竜二, 水戸武彦, 依田信裕, 佐々木啓一

日本口腔インプラント学会学術大会抄録集　2017/09
Biomechanical FEA study for cantilever design of implant superstructure. International-presentation

Shigemitsu R, Sato E, Yoda N, Sasaki K

China-Japan-KoreaDental Science Symposium 2016　2016/12/09
コンビネーションスプリントにより咬合回復を図った一症例

重光竜二

日本補綴歯科学会第１２５回学術大会　2016/07/08

More details Close

専門医ケースプレゼンテーション
Concise CAD/CAM Fabrication Method for Complete Dentures Using CAD Templates

Hirama M, Michii T, Akiyama S, Shigemitsu R, Abe J, Orii Y, Sasaki K

2016/05/28
排列テンプレートを用いたCAD/CAM全部床義歯製作方法の検討

平間麻由子, 道井貴幸, 秋山茂範, 重光竜二, 阿部二郎, 折居雄介, 佐々木啓一

日本デジタル歯科学会誌(Web)　2016
顎骨不均質性を考慮したFEモデルによるインプラント義歯の生体力学的検討

佐々木啓一, 水戸武彦, 重光竜二, 依田信裕, 川田哲男

日本口腔インプラント学会誌　2014/12
Evaluation of the Influence of Implant Alignment on Peri-Implant Stress International-presentation

5th Triennial Congress of Advanced Digital Technology in head & neck reconstruction　2014/09/06
Comparative study on the homogeneity and Inhomogeneity of bone modeling in FEA stress analyses of peri-implant bone.

Mito T, Shigemitsu R, Sasaki K

The 9th Scientific Meeting of the Asian Academy of Osseointegration　2014/07/04
有限要素解析による材料不均質な下顎骨モデルを用いたインプラント埋入方向の検討

大塩雅人, 水戸武彦, 依田信裕, 重光竜二, 佐々木啓一

日本口腔インプラント学会誌　2012/09
インプラント周囲骨のストレス応答に及ぼす上部構造連結の影響

上條達央, 重光竜二, 依田信裕, 郡司良律, 佐々木啓一

日本口腔インプラント学会誌　2012/09
生体内荷重データを用いたFEA解析に基づくインプラント周囲骨内応力に関する検討

重光竜二, 松本哲哉, 水戸武彦, 依田信裕, 小川徹, 佐々木啓一

日本歯科医師会雑誌　2012/08
In Vivo三次元咬合力データに基づくインプラント補綴症例の生体力学的検討

依田信裕, 重光竜二, 小針啓司, 郡司良律, 孫堅, 川田哲男, 小川徹, 佐々木啓一

日本歯科医師会雑誌　2012/08
The influence of implant angle on stress distribution of mandibular bone at chewing cycle

Matumoto T, Ishikawa T, Shigemitsu R, Ishii Y, Yamakawa Y, Yoda N, Ikeda K, Sasaki K

Scientific Meeting of the Japanese Society of Stomatognathic Function　2011/11/15
インプラント埋入方向が機能時の骨内応力に与える影響の分析

重光竜二, 依田信裕, 郡司良律, 小針啓司, 佐々木啓一

日本口腔インプラント学会誌　2011/08
可撤性部分床義歯装着患者の残存歯歯周組織状態に対するメインテナンスケアの効果

冨士岳志, 花渕静, 小山重人, 依田信裕, 佐々木具文, 横山政宣, 小川徹, 塙総司, 佐藤奈央子, 重光竜二, 末永華子, 折居雄介, 赤塚亮, 白石成, 竹内裕尚, 佐々木啓一

日本補綴歯科学会誌　2011/05
可撤性部分床義歯症例の長期経過に関する後ろ向きコホート研究

冨士岳志, 小山重人, 依田信裕, 伊奈慶典, 佐々木具文, 羽鳥弘毅, 横山政宣, 塙総司, 佐藤奈央子, 重光竜二, 末永華子, 折居雄介, 赤塚亮, 白石成, 竹内裕尚, 佐々木啓一

日本補綴歯科学会誌　2011/01
S0201-2-3 Finite Element Analysis of Mechanical Stress Distribution in the Mandibular Bone with Implants Supporting an Overdenture

Shigemitsu Ryuji, Matsumoto Tetsuya, Ishii Yu, Ishikawa Taro, Yoda Nobuhiro, Yamakawa Yuki, Ikeda Kiyohiro, Sasaki Keiichi

The proceedings of the JSME annual meeting　2010/09/04

More details Close

This study aimed to clarify the mechanical stress distribution in the mandibular bone with implants supporting an overdenture using the finite element analysis (FEA) based on the morphological data and 3-dimensional (3-D) load measured in a subject. A couple of 3-D FEA models were created based on data from a 62-year-old edentulous woman, who had installed four implants in her mandible and wore an overdenture, using FEA software (Patran). One model furnished four implants aligned as in the patient. In the other model, each implant was aligned along the direction of the measured load vector in maximum clenching in the patient. The result showsthat the stress distribution was affected by the number of implants and the magnitude and the direction of occlusal load. In addition, changing the implants' alignment to the load direction reduced the von Mises stress to the result from the model as the patient.
Relation Between Status of Using RPDs and Periodontal Condition of Remaining Teeth

INA Y, KOYAMA S, YODA N, SASAKI T, HATORI K, YOKOYAMA M, KUBO K, HANAWA S, SUZUKI Y, SIGEMITU R, SUENAGA H, SUZUKI T, SASAKI K

日本補綴歯科学会誌. 特別号, 社団法人日本補綴歯科学会学術大会プログラム・抄録集 = Program and abstracts, the ... scientific meeting of Japan Prosthodontic Society　2010/08/16
可撤性部分床義歯の種類・設計に関する諸因子が残存歯列へ及ぼす影響

伊奈慶典, 小山重人, 依田信裕, 佐々木具文, 羽鳥弘毅, 横山政宣, 塙総司, 鈴木祐子, 佐藤奈央子, 重光竜二, 末永華子, 折居雄介, 冨士岳志, 佐々木啓一

日本補綴歯科学会誌　2010/01
インプラント埋入方向による周囲骨の応力低減効果口腔内実測荷重に基づく有限要素解析

松本哲哉, 石井優, 重光竜二, 石川太郎, 山川優樹, 依田信裕, 川田哲男, 池田清宏, 佐々木啓一

日本補綴歯科学会誌　2010/01
オーバーデンチャー支台インプラント荷重の生体内三次元解析

依田信裕, 重光竜二, 郡司良律, 川田哲男, 佐々木啓一

日本口腔インプラント学会誌　2009/06
生体内測定に基づく上部構造の連結・非連結の支台インプラント荷重への影響

郡司良律, 依田信裕, 重光竜二, 川田哲男, 佐々木啓一

日本口腔インプラント学会誌　2009/06
インプラント適用患者におけるFEA

重光竜二, 依田信裕, 郡司良律, 川田哲男, 佐々木啓一

日本口腔インプラント学会誌　2009/06
S104 Clinical Dentistry and Stomatognathic Biomechanics

SASAKI Keiichi, YODA Nobuhiro, SHIGEMITSU Ryuji, SUENAGA Hanako, SUZUKI Yuko, KUBO Kei, KAWATA Tetsuo, OGAWA Toru

The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME　2009
Finite Element Analysis of Stress in Mandible with Implant-supported Overdenture

SHIGEMITSU R, TAMURA T, YODA N, SUENAGA H, KAWATA T, YAMAKAWA Y, IKEDA K, SASAKI K

日本補綴歯科学会雑誌. 特別号, 日本補綴歯科学会学術大会抄録集 = Proceedings of the ... conference, the Japan Prosthodontic Society　2008/06/06
Relationship between occlusal rest design and pressure distribution under denture base of removable partial denture in vivo

Suenaga Hanako, Kubo Kei, Shigemitsu Ryuji, Yoda Nobuhiro, Ogawa Toru, Kawata Tetsuo, Sasaki Keiichi

The Journal of Japanese Society of Stomatognathic Function　2008/02/28
レスト設置形態と部分床義歯床下圧力分野生体内測定による検討

末永華子, 久保圭, 重光竜二, 依田信裕, 小川徹, 川田哲男, 佐々木啓一

日本顎口腔機能学会雑誌　2008/02
Relationship between occlusal rest design and pressure distribution under denture base of removable partial denture in vivo

SUENAGA Hanako, KUBO K, SHIGEMITSU R, YODA N, OGAWA T, KAWATA T, SASAKI K

日本顎口腔機能学会学術大会　2007/10/27
可撤性部分床義歯装着患者における使用状況と残存歯歯周組織状態の経年的変化

門脇研司, 小山重人, 川田哲男, 佐々木具文, 羽鳥弘毅, 小川徹, 横山政宣, 久保圭, 塙総司, 伊奈慶典, 重光竜二, 末永華子, 鈴木祐, 加賀谷恵理, 木村幸平, 渡辺誠, 佐々木啓一

日本補綴歯科学会雑誌　2007/04
4.Relationship between occlusal rest design and pressure distribution under denture base of removable partial denture in vivo

Suenaga Hanako, Kubo K, Shigemitsu R, Yoda N, Ogawa T, Kawata T, Sasaki K

2007
部分床義歯床下粘膜面に加わる圧力の生体内多点同時測定

末永華子, 川田哲男, 久保圭, 重光竜二, 依田信裕, 小川徹, 佐々木啓一

日本補綴歯科学会雑誌　2006/07/08
Development and In Vivo Application of the Three Dimensional Force Measuring and Analyzing System for the Implants Supporting the Overdenture

YODA N, KAWATA T, OGAWA T, KUBO K, SUENAGA H, SHIGEMITU R, KURIYAGAWA T, SASAKI K

日本補綴歯科学会雑誌. 特別号, 日本補綴歯科学会学術大会抄録集 = Proceedings of the ... conference, the Japan Prosthodontic Society　2006/07/08
部分床義歯粘膜面に加わる圧力の生体内多点同時測定

久保圭, 川田哲男, 南文将, 重光竜二, 末永華子, 依田信裕, 小川徹, 佐々木啓一

日本補綴歯科学会雑誌　2006/01
部分床義歯粘膜面における生体内圧力多点同時測定

久保圭, 川田哲男, 南文将, 重光竜二, 末永華子, 依田信裕, 小川徹, 佐々木啓一

日本補綴歯科学会雑誌　2005/10

Show all Show first 5

Research Projects 16

OSA病態フェノタイプの識別AIを応用した個別化治療戦略の創成

小川徹, 内藤英樹, 日原大貴, 小川浩正, 重光竜二, 泉田明男, 加地仁

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(C)

Institution: 東北大学

2025/04 - 2028/03
共振周波数解析にAIを応用した歯冠補綴装置の異常検知デバイス

小川徹, 内藤英樹, 日原大貴, 重光竜二

Offer Organization: 公益財団法人テルモ生命科学振興財団

System: 開発助成金

Category: 医療機器開発

2024/01 - 2028/03
Development of a new swallowing assessment based on musculoskeletal simulation

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2023/04/01 - 2026/03/31
Development of the mandibular functional assessment based on the musculoskeletal simulation

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (A))

Institution: Tohoku University

2022/04 - 2024/03
Research for the musculoskeletal simulation based on biological data

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2020/04/01 - 2023/03/31
PETバリデーティッドFEAに基づく顎骨リモデリングシミュレーションの構築

水戸武彦, 重光竜二, 末永華子, 依田信裕, 小川徹, 佐々木啓一

Offer Organization: 日本学術振興会

System: 科学研究費助成事業基盤研究(C)

Category: 基盤研究(C)

Institution: 東北大学

2018/04/01 - 2020/03/31

More details Close

本研究は, 歯科インプラントにおける臨床的偶発症の予防, さらには歯科インプラントの埋入に係るメカノバイオロジカルな反応の把握した顎骨リモデリングシミュレーションの最適化に寄与する. すなわち, 従来の解剖学的な観点を考慮した手法に加えて本シミュレーションを埋入システムに包含することで, より安全で効率的な歯科インプラント治療を実現することが期待される.上記に示す展望の実現に向けて, これまで申請者らが従事してきた研究並びに臨床経験を基に新たな知見を得ることを目標として本課題に携わった. 特に申請書において, 研究目標を年度ごとに細分化してマイルストーンを設置している. 本年度は, 共同研究者の小川らが確立した実験モデルを踏襲して，Wistar系ラットの脛骨部について純チタンのカスタムメイドインプラントを埋入したモデルを用いて解析を行った. 骨強度評価ソフトウェア(MECHANICALFINDER, 計算力学研究センター, 日本製)を使用して, 撮像したラット脛骨CTのDICOMデータより骨形状を抽出し, 有限要素モデル（以下, FEモデル）を作成した. ラット脛骨の皮質骨および海綿骨の材料特性は, 部位特異的な骨梁構造及び材料非線形性を考慮した設定を行うことで骨内領域を従来手法に比べてより実現象の再現性に富んだモデル構築に成功している. 加えて, 本モデルは経時的な骨代謝の観察と対照することでインプラントの骨梁形態変化の評価を行う基盤となるFEモデルである.
Development of remodeling FEA based on the morphological assessment of temporal CT data

Ryuji Shigemitsu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2017/04/01 - 2020/03/31

More details Close

This study was aimed to elucidate the biomechanical effects of bone remodeling over a period of 12 years by means of morphological assessment and finite element analysis (FEA) studies from CT data. The subject with an implant-supported overdenture, was chosen to clarify the effects. Two kinds of FE models were constructed from CT data taken at two time points: pre-implantation (Model A) and 12 years post-implantation (Model B). The results show a homogenization of the stress and strain energy density between the implant regions from Model A to Model B. The results of the morphological assessments demonstrated that the bone mass and quality had significantly changed over 12 years. Area-specific bone resorption was also observed at the bone surrounding each implant. The combined findings indicate that the homogenization of mechanical factors was due to chronological changes in bone morphology, suggesting adaptation to mechanical loads by peri-implant bone remodeling.
Research for the siimulation model of chronological mandibular bone density

Sasaki Keiichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2015/04/01 - 2018/03/31

More details Close

In this study, it was intended to construct the three dimensional simulation cord which could express the living bone remodeling and density of the jawbone which continued changing by bone metabolic disorders or osteoporosis or aging during the living life of human. In the results, comparing the simulation calculation with the bone density distribution that we measured from an actual CT data, the bone density in the simulation tended to be slightly lower than the bone density of CT measurement, but successfully reproduced the bone density changing through the life and gender-related tendency. The bone density simulation model may predict the mandibular bone density distribution and changing in the life.
Development of optimizing simulation for treatment palanning with dental implant.

SHIGEMITSU RYUJI

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2014/04/01 - 2017/03/31

More details Close

This time we would like to focus on how the superstructure design of implant-supported fixed prosthesis and the number of implant affects mechanical behavior. The patient is 67-year-old woman, and three implants were installed between second premolar to second molar region in the left side of mandible. 3 Types of superstructure design were modeld with biological loading data.In summary,1) Decrease of the number of implants supporting FPDs doesn’t always cause an increase of stress and displacement.2) Cantilever bridge design causes an increase of stress and displacement.3) The stress and displacement were increased remarkably during function. Finally in conclusion, from this study, the design of cantilever bridge may cause an increase of stress in peri-implant bone and displacement of superstructure in implant-supported FPDs.
Guideline for the early diagnosis of residual ridge by using NaF-PET/CT and FEA

SUENAGA HANAKO, YAMAGUCHI KEIICHIRO, Li Qing, Swain Mike

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2014/04/01 - 2017/03/31

More details Close

NaF Positron Emission Tomography (PET) can identify subtle functional variation prior to the major structural change detectable by X-ray. NaF-PET/CT scan was performed to examine the change of bone metabolism in the residual ridge underneath denture before and after the RPD treatment. The resultant mechanobiological response was analyzed using a 3D finite element (FE) model derived from the computerized tomography (CT) images of a corresponding patient under the occlusal loading. Mechanobiological stimulus determined from the FEA are quantified and compared with the standardized uptake values (SUV) of PET. The increased application of occlusal force after RPD insertion induced higher mechanical stimuli in the residual bone, and SUV increased in the region of residual ridge with higher mechanical stimuli. SUV had clear correlation with mechanical stimulus in the cancellous bone, especially after RPD insertion (R2 > 0.8, p < 0.01).
Development of 3-demensional simulation code based on age-dependent bone density

SASAKI Keiichi, GESSO Hirokazu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2012/04/01 - 2015/03/31

More details Close

The purpose of this study was to develop 3-demensional simulation code based on age-dependent bone density. During 3years of study periods, constructing of the simulation model, refining of individual analytical parameters and comparison between the measured CT data were carried out in consistently. Reviewing consistency between subjects CT data and the simulation model, correlation between the actual bone geometry and analytical bone geometry was observed. The results of this study is intended to the effectiveness of predictive simulation of bone remodeling in the mandible. Moreover, these results contribute to the diagnostic prediction in treatment with dental prosthesis.
Application of effect of low-magnitude and high-frequency loading on peri-implant bone to the implant

OGAWA Toru, SASAKI Keiichi, IKEDA Kiyohiro, YAMAKAWA Yuki, SHIGEMITSU Ryuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2011 - 2013

More details Close

This study aimed to examine the influence of various loading on dynamic changes of bone-metabolism around the implant using a super-high resolution [18F]NaF-PET in rat tibiae. Adult male Wistar rats installed experimental implant on the tibia were used in this study. Increase of bone-metabolism was observed until 7 days after implantation surgery and then gradually decreased. Differences in bone-metabolism between immediate loading and no-loading group were found. This suggests loading affects bone-metabolism around the implant. Also
Stress distribution in the peri-implant bone by dyanamic loading data based analysis.

SHIGEMITSU Ryuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2011 - 2012

More details Close

The purpose of this study was to investigate the stress in peri-implant bone and the effect of prosthetic designs by dynamic loading data based finite element analysis. Overall, the splinted superstructure model reduced stress in peri-implant bone in comparison with the non-splinted superstructure model. The result of this study is meaningful for implant treatment guidelines based on biomechanical point of view.
Biomechanical investigation of occlusio n on Implants-supporting Fixed Prostheses

KAWATA Tetsuo, SASAKI Keiichi, OGAWA Toru, YODA Nobuhiro, SHIGEMITSU Ryuji, SUENAGA Hanako

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2009 - 2011

More details Close

The 3-D load-measuring device, comprised of a piezo-electric force transducer and the experimental superstructure, was developed. The devices were tightened with screws into implant-fixtures in the subjects. The 3-D loads during the maximum voluntary cenching (MVC)and biting a piece of paraffin wax (WAX)were registered. The magnitude and direction of the recorded loads were analyzed in the spatial coordinates based on her Frankfort and sagittal planes. The device enabled us to estimate the 3-D loads on t he implants. Load exerted on the implant supporting fixed superstructure during chewing function was larger than that during clenching. The amount of change in the load direction during chewing was larger than that during chewing. It was suggested that the species of teeth or occulusal contact was affect the load direction
Investigation of mechanical stress and bone metabolism based on FEA and CT image analysis.

SHIGEMITSU Ryuji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

Institution: Tohoku University

2009 - 2010

More details Close

The present study aimed to development of implant treatment in clinical situation. In this study, we were concerned with a biomechanical relation between implant and peri-implant bone under the mastication. It is concluded that changing implant direction reduced the stress in the peri-implant bone. The result of this study is informative to the implant treatment for each case.
The biomechanical analysis of the load exerted on the implants supporting an overdenture based on in vivo measurement

SASAKI Keiichi, KURIYAGAWA Tsunemoto, KAWATA Tetsuo, YODA Nobuhiro, SHIGEMITSU Ryuji, SUENAGA Hanako

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2007 - 2009

More details Close

The 3-dimensional (3-D) functional loads exerted on implants are essential factors in the biomechanical control of implant-supported overdentures. Since there have been few data in vivo, parameters which could affect the loads are still unclear. As for as the results of this study, the loads exerted on the implants during function are affected three dimensionally by the number of implants supporting the overdenture.

Show all Show first 5