Hanako Suenaga

• The University of Sydney

Objectives This prospective cohort study aimed to assess the association between dental disease burden and postoperative infective complications (POICs) in patients undergoing major surgical procedures under general anaesthesia. Methods Pre-surgical dental assessment was undertaken on patients planned for major surgery. Demographic and surgical va...

Objectives Oral bacteria may contribute to postoperative infectious complications including postoperative pneumonia or surgical site infection. The aim of this study was to investigate the impact of preoperative dental care on postoperative outcomes among surgical patients under general anesthesia. Design Retrospective cohort study. Setting and P...

Patient: A 33-year-old man diagnosed with extranodal natural killer cell/T-cell lymphoma, nasal type (ENKTCL-NT) inducing palatal perforation was referred to the perioperative oral care support center of Tohoku University Hospital for dental care to support cancer treatment including chemotherapy and hematopoietic stem cell transplantation (HSCT)....

Patients: Seventy-one and 73 years-old males visited a perioperative oral care support center to receive perioperative oral management during tongue cancer (T1N0M0) treatment. To improve their quality of life (QOL) during brachytherapy while preventing radiation-related complications including osteoradionecrosis due to 198Au grain brachytherapy, s...

Patient: A 63-year-old male visited our hospital with a complaint of difficulty in chewing due to excessive mobility of an upper right fixed partial denture. He had secretory dysfunction of the salivary glands after radiotherapy of 70Gy for oropharyngeal cancer. Caries and periodontitis were observed in every tooth. Prosthodontic treatment was perf...

18F-fluoride positron emission tomogra-phy (PET) can identify subtle functional variation prior to the major structural change detectable by X-ray. This study aims to investigate the mechanobiological bone reaction around the abutment tooth and in the residual ridge, induced by insertion of removable partial denture (RPD) within two different group...

With ever-growing aging population and demand for denture treatments, pressure-induced mucosa lesion and residual ridge resorption remain main sources of clinical complications. Conventional denture design and fabrication are challenged for its labor and experience intensity, urgently necessitating an automatic procedure. This study aims to develop...

Despite their considerable importance to biomechanics, there are no existing methods available to directly measure apparent Poisson's ratio and friction coefficient of oral mucosa. This study aimed to develop an inverse procedure to determine these two biomechanical parameters by utilizing in vivo experiment of contact pressure between partial dent...

Polymethyl methacrylate (PMMA)-made prostheses used in the oral cavity were evaluated by multimodal assessment in order to elucidate the biodeterioration of PMMA. In used dentures (UD), the micro-Vickers hardness of the polished denture surface and denture basal surface was lower than that of the torn surface (p<0.05), whereas the shaved surface ap...

While nuclear medicine has been proven clinically effective for examination of the change in bone turnover as a result of stress injury, quantitative correlation between tracer uptake and mechanical stimulation in the human jawbone remains unclear. This study aimed to investigate the relationship between bone metabolism observed by 18F-fluoride pos...

Although implant-retained overdenture allows edentulous patients to take higher occlusal forces than the conventional complete dentures, the biomechanical influences have not been explored yet. Clinically, there is limited knowledge and means for predicting localized bone remodelling after denture treatment with and without implant support. By usin...

This study aimed to investigate the pressure distribution beneath the denture bases of removable partial dentures (RPDs) with different occlusal rest designs (ORDs) by in vivo measurement. Four types of detachable occlusal rests (mesial and distal, distal, mesial, and nonrest) were placed on the direct abutment teeth of distal extension RPDs in fou...

Implant-retained overdenture has been widely applied as a solution to edentulous ageing; however, a major concern for the denture wearers is bone resorption induced by the prosthetic interaction with soft tissue and bone. Early studies have revealed that the bone resorption is associated with the disturbance to the mucosa blood flow. This study aim...

This study aims to analyze the functional contact pressure induced by Removable Partial Denture (RPD) by using a 3D finite element (FE) model constructed based on patient specific CT scans. This model was validated against the in vivo test results. The outcomes demonstrate that the finite element simulation has the capability of quantifying localiz...

Because of its high predictability of success, implant therapy is a reliable treatment for replacement of missing teeth. The concept of immediate implant loading has been widely accepted in terms of early esthetic and functional recovery. However, there is little biological evidence to support this concept. The objective of this study was to examin...

Objective Excessive pressure due to wearing mal-adapting dentures is well known to cause residual bone resorption beneath the denture. X-rays have been commonly utilized to evaluate the changes in the bone beneath the denture. However, X-ray images merely detect bone density and relatively large changes in the bone shape and structure, whereas nucl...

抄録 目的：近年，ノンクラスプデンチャー（NCD）の臨床応用が拡大している．しかしながら，機能時にNCD が生体に及ぼす力学的影響に関しては，不明な点が多い．本研究はNCD装着時の支台歯および義歯床下粘膜部へ加わる荷重を静力学的に測定し，それらからNCDの生体力学的特徴を明らかにすることを目的とした． 方法：下顎第一小臼歯と第二大臼歯を支台歯とし，第二小臼歯と第一大臼歯が欠損している中間欠損歯列モデルを製作した．両支台歯内部には小型水晶圧電式センサを，また義歯床下粘膜相当部にはシート型触覚センサを設置した．実験用義歯は，材料がポリアミド–ナイロン系樹脂のみ（PA-NCD），ポリカーボネート系樹脂のみ（PC-NCD），支持・把持要素に金属フレームを用いたポリカーボネート系樹脂（mPCNCD），...

A 66-year-old woman, who had a bilateral free-end edentulous mandible and no experience with dentures, was examined for the chief complaint of masticatory dysfunction on left side of dental arch. A unilateral distal extension removable partial denture (RPD) replacing lower-left molars was selected. Tomographic images were obtained using Fluorine-18...

Objectives: It is well known that wearing mal-adapting denture causes the bone resorption beneath the denture base. The structure and volume of the bone is maintained by the tireless bone metabolism. Bone deformation is considered as the consequence of the bone metabolic changes. X-ray images merely detect the morphological and structural changes o...

Objectives: The aim of this retrospective cohort study was to investigate the influence of continuing use of removable partial dentures (RPDs) on periodontal condition of abutment teeth and non-abutment teeth 5 years after RPDs delivery. Methods: Two hundred and fourteen patients were treated with RPDs at the Tohoku University Hospital between 1996...

Objectives: Finite element analysis is an effective method to estimate the mechanical stress in the bone surrounding implants. However, most of FEA studies use simplified load condition since it is difficult to measure 3-D functional loads of patient and apply them to FEA load condition. The aim of this study was to develop individual FEA model bas...

To develop a system to measure the pressure distribution under the base of a removable partial denture (RPD) and to apply it in vivo. A tactile sensor sheet with 100 sensing points and a measuring system (I-SCAN, Nitta, Osaka, Japan) were used. The sensor was calibrated before being applied in vivo. A subject with a mandibular RPD (Kennedy class II...

Objectives: Mechanical stress in the bone surrounding the osseointegrated implants is important an essential factor for the prognosis of implant-supported prosthodintic treatment. Previously, the authors reported stress distribution in the bone surrounding implants supporting an overdenture by using Finite element analysis (FEA) based on the morpho...

Ⅰ． 目的 インプラント義歯では，インプラント支持骨が大きな役割を担っており，インプラントへの荷重量，方向の違いに起因するインプラント周囲骨の応力は，その骨代謝に影響を与える大きな要因とされている．有限要素法解析は，生体内では実測不可能な顎骨内応力を解明する有効な手段である．しかしこれまでの報告では，解析結果に大きな影響を及ぼすと考えられる幾何形状，荷重条件などが単純化されている場合が多く，また結果を評価するための実験データも不足しており，解析の妥当性には疑問が残る． 本研究は，全体解析を目的とした有限要素解析を行い，顎骨内応力に影響を及ぼす重要な因子である顎骨の幾何形状，支台インプラント数の違いによってもたらされたインプラント荷重値・荷重方向の違いが，インプラント義歯の顎骨内応力分布様相に...

A dental clinical support system to estimate the mechanical stress in mandibular bone withimplants was manufactured in a manner readily accessible for practical application, as an in-tegration of the existing techniques established in the area of computational engineering. Amandibular bone model was constructed from a set of X-ray CT images using a...

A load-measuring device comprised an inner part forming a metal core, a force transducer (Kistler Instrument AG), and an outer part forming a metal crown was developed and applied to a tooth for measuring functional load in vivo. The 3-D direction of the load on a tooth during clenching changed as the magnitude increased. It enabled time series mea...