Thèses : « DENTAL DESIGN »

1

Richardson, Charlotte Jane. « Benign design for dental restorations ». Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327645.

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Tse, Ho Yeung Brian. « Exploring haptics in dental training : tissues identification, dental filling, design and development of a dental training system ». Thesis, University of Reading, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603500.

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A denial student is required to gain practical experience as well as theoretical training at the early stage of their training. In order to restore a decayed tooth, fundamental dental procedures are necessary, including: 1. Identification of caries using a sharp denial probe, where the probe physically is inserted a short distance into the caries to observe properties such as volume; 2. Unhealthy tissues must be removed by drilling operation or probe. 3. Complete the restoration procedure by filling in composite resin such as light cured photopolymer. All of these procedures require a high degree of dexterity. Traditional training involves a real denial patient or human head-like dummy model, which pose several distinctive disadvantages such as safety, examination across students, high maintenance cost as well as the recording and feedback of the procedures. A haptic dental training system provides a viable solution to these challenges. This thesis explores the key process in tooth restoration and the development of a new haptic rendering algorithm. These include the development of the mathematical model to identifying material with a short distance insertion probing and filling operation with resin. It also presents a novel hardware design of a dental training system, which allows a student to perform a haptic drilling operation, with a hand-eye collocated gesture. Large scale evaluation of the system is done and results are presented.

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Jager, Nicolaas de. « Design parameters for all-ceramic dental crowns ». [S.l : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2004. http://dare.uva.nl/document/87941.

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Allison, Thomas Austin. « Senior Design Project : Medical/Dental Site Development Plan ». Thesis, The University of Arizona, 2012. http://hdl.handle.net/10150/271613.

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Site development is a large portion of what Civil Engineers do in their chosen career field. This project yielded a site development plan for the Northeast corner of Oracle Road and Linda Vista Boulevard in Oro Valley, Arizona. More specifically, it was a 4.83 acre rectangular tract of land that was 1 section out of 4 that made up the larger parcel. The other 3 smaller parcels had their own respective groups design development plans for them that had to be compatible with ours. Communication between groups was essential for integrating drainage and transportation considerations. Combining the four Civil Engineering disciplines of geotechnical, hydraulic, structural, and transportation engineering, workable plans for a LEED certified two-story medical/dental office with an atrium and functional architectural floor layout were created. The project had to follow both city and county codes and was finalized with a presentation in front of a board of professional engineers that represented the different disciplines mentioned above.

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Mehzabeen, Kazi Rizwana. « Design and Development of a Biomimetic Dental Wear Test System and Characterizing Restorative Dental Materials ». Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23033.

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Dental wear is a progressive phenomenon that can lead to onset of tooth decay. It is characterized by the degradation of an outer protective tooth enamel followed by its breach and subsequent loss of tooth integrity unless treated. The treatment of dental wear involves the restoration of worn tooth surfaces with restorative biomaterials. However, the restorative biomaterials themselves can contribute to wear of the enamel of the opposing teeth. This wear of the opposing teeth is driven by a number of factors, such as toughness, hardness, surface roughness and wear conditions. Proper selection of restorative biomaterials is important to preserve occlusal harmony and normal functionality of dentition. In vitro studies that are repeatable and controllable can be used to characterize the wear propensity of restorative biomaterials. Replicating in vivo conditions within an in vitro test model can provide important evidence for pre-clinical evaluation, including with antagonist teeth specimens. By accounting for tooth functional anatomy, dental biomechanics, and dynamic oral environment, important insights can be obtained for restorative biomaterials and donor tooth specimen interactions. In this study a biomimetic dental wear test method was designed, built, and used for a range of dental testing experiments. A range of user requirements of two-body dental wear tests were formulated. An actuation system was developed to simulate cyclic chewing force on dental specimens. Test parameters, including load-force, contact-time, and chewing cycle frequency, were studied with data logging and follow-up data analysis. The developed wear test system was used to conduct dental wear test experiments with restorative bioceramics, and human teeth. This was done both to validate the test system itself, and also to test the wear caused by dental restorative systems on an opposing natural tooth. Studies were designed and conducted utilizing the following features: continuous water-flow, with or without water temperature thermal-cycling; simulated saliva as a static (non-flowing) liquid medium. In all test configurations, a human tooth was the antagonist, i.e., it was actuated against a test surface (restorative material or human tooth test surface), using controlled cyclic motion and loading. The wear of the enamel of the antagonist tooth was then quantified, and from this data, a wear hypothesis could be evaluated. Furthermore, qualitative surface topographical analysis was also performed, both on antagonist teeth, and their respective test materials. This study therefore enabled the effects of testing independent variables (thermocycling parameters, lubricating medium, fluid draining), on the dependent variables of wear and surface topography, to be evaluated by quantitative and qualitative analysis. Articulating human teeth (antagonist) were tested against two different surface finishes of zirconia ceramic (both of which are used in contemporary dental clinical practice), as well as enamel controls (human teeth). This enabled zirconia to be characterized based on its contribution to the enamel wear of opposing teeth, in comparison to the wear outcome for the natural tooth-on-tooth system. Wear results were analysed, and assessments were made of the effect of surface roughness or surface finishing procedures of zirconia, on the enamel wear of a natural opposing tooth. The results showed that zirconia ceramic, regardless of surface finish and lubricating media, caused less wear to the enamel of an opposing tooth, in comparison to the natural tooth-on-tooth system. Laboratory-polished lithium disilicate ceramic (IPS e.max: used in contemporary dental clinical practice) was also tested, together with laboratory-polished zirconia, in a wear validation study that involved thermocycling over a 10 to 55oC temperature range, with an instantaneous temperature change every 120 seconds. The results showed no noticeable difference between the vertical wear of enamel against zirconia and lithium disilicate. However, there were differences in surface morphology: a deep ploughed wear appearance was seen on the lithium disilicate, while no significant surface wear effects were seen on the zirconia. Wear of the antagonist human tooth against zirconia was measurably higher with thermocycling than for the comparative room temperature study. Test results from the saliva study, using human teeth antagonist articulating against zirconia test surfaces, showed that artificial saliva as a lubricating medium helped increase wear resistance of dental enamel, compared with water media, in wear simulation tests. Associated issues of verification and validation of the designed dental wear testing system were also addressed. Benchmark testing was conducted in a certified wear test device/chewing simulator (SD Mechatronic, Feldkirchen-Westerham, Germany) with the aim of checking validity of the results produced in the designed dental wear testing system, thereby verifying the system performance. The benchmarking tests confirmed the validity of the dental wear testing system, developed as part of this PhD project. Moreover, the study results from the benchmark testing also helped provide further insights and understanding of the results derived from the designed dental wear testing system. Overall, the wear simulator developed in this research project showed promising results for dental wear testing and demonstrated the potential for use in in-vitro pre-clinical laboratory studies for characterizing dental restorative materials.

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Ahern, Stacey. « Applying ergonomics to dental scalers ». Thesis, Kansas State University, 2010. http://hdl.handle.net/2097/6848.

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Master of Science
Department of Industrial & Manufacturing Systems Engineering
Malgorzata J. Rys
The current state of the dental industry shows an increasing number of dentists and dental hygienists who are reducing hours and retiring early due to the injuries sustained while working. These injuries, or cumulative trauma disorders, can be reduced by applying ergonomics in dental tool design. The goal of ergonomics is to reduce current injuries but also prevent future ones. In addition, population demographics have shown an increasing trend in female dentists. With a shift from the male dominated field, design for different anthropometric measurements needs to be investigated. In order to pinpoint sources of pain, a survey was designed and distributed to dentists in Kansas, Missouri, and Texas. Even with a small sample size (n=24), results confirmed past studies in the dental industry of pain originating in the neck, shoulder, lower back, and wrist/hand region. The reasons stemmed from the repetitive motions and forces applied during dental procedures. Responses also found that ergonomic principles need to be applied to the handle and grip portion of dental scaler design. Dental scaling is the procedure to remove deposits on teeth, such as plaque and calculus, most commonly performed by dental hygienists. First, the history of dental tools, angulation, tool weight, and materials currently utilized were researched before looking into specific design factors for modification. Currently, the handle grip area on all dental tools range in size, but a 10 mm grip has been proven to be optimal. The optimal tool weight has yet to be determined as 15 grams is the lowest weight to be tested. Most tools are made of stainless steel and resins, which are not compressible. An experiment was designed to test a new dental scaler (A) made of a titanium rod with added compressibility in the precision grip area. The aim was to help reduce pressure on the fingers and hand muscles and increase comfort during scaling. The experiment utilized a Hu-Friedy sickle scaler (B) and a Practicon Montana Jack scaler (C) as controls to show two design spectrums, weight and material. The subjects (n=23) were taught the basics of scaling and required to scale using a typodont. The change in grip strength (Δ GS), pinch strength (Δ PS), and steadiness of the subjects hand were tested. An absolute and relative rating technique was utilized pinpointing that the new dental scaler was preferred with the eigenvector (A=0.8615, B=0.1279, C=0.0106). Statistical analysis confirmed this tool preference while also finding the interaction of gender and tool and Δ GS Tool A versus Tool B for males to be significant.

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Marková, Gabriela. « Design zubařského křesla ». Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228266.

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This thesis is deals with design of dental chair which is integrated into dental unit. Whole concept of the proposal is in conformity with compulsory requirements for equipment of dental unit. Whole proposal meets technical, ergonomic and hygienic requirements, which are especially in health service very high. The main point of design proposal is elaboration of whole shape arrangement and determination of colour scheme. These characteristics have high influence for patient psychic. Comfortable sitting of patient and his rest help to doctors with treatment. Computer visualization and model in scale factor 1:3 is included.

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Ye, Lin Holder Andrew J. « Application of quantum mechanical QSAR to dental molecule design ». Diss., UMK access, 2007.

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Thesis (Ph. D.)--Dept. of Chemistry and School of Pharmacy. University of Missouri--Kansas City, 2007.
"A dissertation in chemistry and pharmaceutical science." Advisor: Andrew J. Holder. Typescript. Vita. Description based on contents viewed Apr. 15, 2008; title from "catalog record" of the print edition. Includes bibliographical references (leaves 89-93). Online version of the print edition.

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Rahmanivahid, Pooyan. « Investigation on influence of dental implants ». Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/13789.

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Osseointegration is defined as the direct physical and practical relation between the living tissue and implant surface. Although, success rate of dental implants is high, implant failure occurs. Overloading implants from occlusal forces are known as one of the main reasons. In order to have successful implant, a dynamic balance must be provided between mechanical and biological elements (Isidor, Flemming 1996). Şimşek et al. reported bone quality, oral sanitation, host medical condition and biomechanical parameters as the main reasons for implants failure. Also, implant fixture micromotion and inappropriate stress in the bone implant interface is known as the potential reasons for early bone loss and implant failure (Şimşek, Barış 2006). Even so, implant position in jawbone, bone density; biomaterial properties of implant surface, treatment technique, loading history and patient clinical status are the influential factors in implant success (Brunski, J.B. 1999). Although there are many studies on stress distribution of implants in bone-implant interface, majority are limited to current implants in the market. However, current designs have been developed by marketing purposes rather than scientific considerations. Therefore, there is need to introduce and analyse new designs in order to optimize implant structure. Recent investigations have shown reliability of FEA method in simulating human jawbone situation. This research aims to develop a new dental implant with better life expectancies and introduce an optimized implant based on FEA stress analyses and experimental tests. Therefore, based on literature recommendations a series of new design factors are defined and analysed. In this study, a primary design is created in AutoCAD and yields to 3 different implants developed in SolidWorks. Branemark MK IV was selected as the bench model to play role of control group. Then, CT-scan images of human jawbone are imported to MIMICS to create a host bone model. Implant and jawbone models are assembled in 3-Matic and exported to Abaqus for final analyses. A series of loadings are defined to examine implant performance in different conditions. Branemark and C-3 implants are manufactured from Titanium for experimental analyses. Mechanical tests on sawbone foam blocks and cadavers are targeted to portray realistic performance. This research demonstrates C-3 model as the optimized dental implant, which presents a new design profile and better performance in low bone densities. The FEA and experimental results validate the benefit of the new design compare to the conventional ones. Furthermore, results can provide a basis for future designers to develop further optimizations.

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Kirouac, Roger, et Brad R. Triebwasser. « Design and implementation of a Dental Information Retrieval System (DIRS) ». Thesis, Monterey, California : Naval Postgraduate School, 1990. http://hdl.handle.net/10945/34854.

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Approved for public release; distribution is unlimited.
All Naval dental treatment facilities (DTF) worldwide are required to submit monthly reports containing dental records of treatments provided and overall dental readiness to COMNAVMEDCOM, in Washington, D.C. These reporting requirements are standardized to meet not only the requirements of the Navy, but also as input to the DOD mandated Medical Expense and Performance System (MEPERS). At many commands, this data collection storage and reporting effort is currently performed manually, adding unnecessary additional administrative burden. This thesis develops a computerized database system providing increased accuracy and productivity, and capable of meeting the NAVMED reporting requirements. The Dental Information Retrieval System (DIRS) developed will record all treatments provided for each beneficiary category described in NAVMEDCOMINST 6600.1B, and will facilitate internal external daily, weekly, monthly and annual reporting requirements. An important design consideration is providing the DIRS developed with the requisite capabilities specified by the DTF's, without imposing additional hardware requirements. NAVDENCLINIC Long Beach, CA>, is the sponsoring activity for DIRS, and will serve as the test sited for system implementation. If the system is successful, Director of Dental Services, San Diego, CA>, has indicated interest in the system as a Navy-wide managerial tool.

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King, Toby. « Systematic medical engineering design ». Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360635.

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Seto, Wing-chun Adrian. « Design factors affecting air turbine handpiece performance ». Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B31954388.

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Seto, Wing-chun Adrian, et 司徒穎俊. « Design factors affecting air turbine handpiece performance ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31954388.

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Tam, Karen, et Karen Tam. « Examining Productive Failure Instruction in Dental Ethics ». Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/624532.

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These three papers examine "productive failure" as a viable learning design to improve problem solving skills using open-ended problems. Productive failure, a teaching method, is based on the premise of unsuccessful learning performance in solving for complex problems with little to no support while yielding productive learning for subsequent problems. Kapur (2008) argues that hidden efficacies of learning exist in failure in which learners potentially learn through experimentation from their exploration and struggle in solving complex problems in a way that learners must first try and solve complex, novel problems on their own, but ultimately will fail to reach a solution. We have limited understanding if this type of design would be effective on complex problems with multiple solutions since previous studies on productive failure focused on problems with a canonical solution. In the three papers, I examine the extent to which students learn how to solve moral dilemmas in productive failure (PF) compared to lecture and practice (LP) and to what extent instruction in PF helps students learn skills in transferable problem solving. One paper describes a pilot study that was conducted with 21 second-year dental hygiene students. In the randomized-controlled study, analysis did not show significant differences on moral reasoning (p = .06) and transfer of knowledge (p = .58) between PF and LP instructional method. However, the effect size on students' posttest scores was high (d = .76) which as a result of the educational intervention, suggests that PF students demonstrated acquisition of new thinking and approached the complex problem in a more sophisticated moral way of thinking. To replicate these findings, the results from the pilot study were used to make adjustments in instructional and research design for a full-scale study. The second study on 77 second-year dental hygiene students from four dental hygiene programs further shows that PF students gained a deeper conceptual understanding and were better prepared for subsequent problems. PF students, I found, demonstrated greater shifts from simplistic thinking to post conventional thinking compared to LP students. Although PF students performed similarly when compared to LP students on their posttest scores in the moral responses, LP students scored lower than their pretest problem and the difference between pretest and posttest scores in LP School had a moderate effect in a negative direction (d= -.64). Findings in both studies suggest that productive failure design has the potential to help students reach a deeper conceptual understanding when they 1) analyze their own failure; 2) use the learned concept to build upon their own prior knowledge; and 3) repair existing mental models to successfully solve complex problems. As such, continued exploration of various instructional approaches like productive failure is still needed as alternatives to lecture and practice for developing problem solving skills.

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Kalidindi, Varahalaraju. « OPTIMIZATION OF DRILL DESIGN AND COOLANT SYSTEMS DURING DENTAL IMPLANT SURGERY ». UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_theses/314.

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Dental implants are an effective alternative for the replacement of missing teeth. The success of the implant depends on how well a bone heals around the implant, a process known as osseointegration. However, excessive heat generated during the bone drilling will cause cell death and may prevent osseointegration of the implant, resulting in early failure. There are many factors which contribute to the heat generation during drilling. Experiments were carried out to investigate the affect of variable drilling factors on heat generation during drilling operation. Natural bone is not an ideal material for such research, as it varies widely in density and other parameters of interest.. It would be desirable to have a more uniform and consistent material to use in such studies. However, such a material must be similar to bone to allow the results to be extrapolated to the clinical situation. The current study describes and validates a model for use in such studies. Polymethylmethacrylate (PMMA) is the material chosen for our studies. A theoretical model was developed to study the effect of different drilling parameters on temperature rise during drilling operations. Comparison of observed results obtained from experiments was made with the results from theoretical study. Comparison of results for PMMA and human bone are also shown explaining how PMMA material can be substituted for human bone. The results suggest that the PMMA model is an acceptable surrogate for bone in such studies.

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Buranadham, Supanee. « Dowel design optimization in an endodontically treated single-rooted tooth a finite element stress analysis / ». Diss., University of Iowa, 2000. http://ir.uiowa.edu/etd/191.

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Thesis (Ph. D.)--University of Iowa, 2000.
Supervisor: Clark M. Stanford. Title-page, preliminaries, Certificate of approval, Table of contents and Project summary issued in paper (xii, 13 leaves ; 28 cm.). Includes bibliographical references. Also issued on CD-ROM (144 files, 33.7 megabytes).

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Marandu, Simon Ignace. « Design of a mechatronic measurement system for surface fatigue of dental composites ». Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/2616.

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This thesis focuses on the design and development of a rolling-ball mechatronic system for on-line testing and measurement of surface contact fatigue of dental composites, and is based on a technique initially developed at the Newcastle Dental School. The mechatronic system synergistically combines the mechanical/electronic hardware with a low-cost embedded digital signal controller (DSC microcontroller) hardware and software to monitor and measure in real-time surface wear due to contact fatigue. ISO/TS 14569-2.2001 standard specification for testing of dental materials was used for selecting appropriate test variables. The mechatronic system attempts to simulate the human oral environment with temperature and moisture being controlled. A closed-loop PI control algorithm combining both optical encoder pulse timing and counting methods is used to drive a dc brushless motor at speeds of 240 and 2040 rpm. A small (2mm diameter) ruby ball is mounted in a V-grooved mandrel which over time creates a circular orbital wear path in the dental composite material. One algorithm has been designed to acquire and process the on-line measurement of wear using a linear voltage differential transformer (LVDT), with another monitoring the fatigue cycling process. A graphical user interface (GUI) has also been designed and implemented on a laptop which is connected to the rig embedded controller. A kinematic model of the rolling ball constrained in a V-groove has been developed along with a finite element analysis of the surface deformation. This has been augmented by a comprehensive test programme, in dry, moisturized and elevated temperature (i.e. 37°C), using Synergy D6 specimens. Using ANOVA test, 70% reproducibility of fatigue track measurements was attained. A comparison of LVDT transducer and profilometer measurements indicated 5% consistence with each other. The insight gained from the testing programme sets a basis for an extensive programme to qualify and validate the measurement system basing on ISO/TS 14569-2.2001 specifications.

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Mubarak, Suhayla Walsh Laurence J. « Design, implementation and assessment of an instructional cd-rom in dental radiology / ». [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16692.pdf.

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Calles, Linus. « Development of ergonomic seating for dental operator chair ». Thesis, Karlstads universitet, Institutionen för ingenjörsvetenskap och fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-62822.

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This report covers the examination of course Degree of Bachelor of Science in Innovation and Design MSGC12. The course is given on the Innovation and Design Program at the Faculty of Health, Science and Technology at Karlstad University. The course corresponds to 22.5 credits and extends over the spring semester in 2017. Examiner is Leo de Vin and supervisor is Kristina Gullander. The project is carried out on behalf of Support Design AB, which manufactures and distributes handmade ergonomic chairs. The company is aiming primarily at the dental and medical industry, where they have discovered a great interest in flexible and ergonomic chairs. There are today competing brands that manufacture chairs whose seats are similar to Support Designs. The company now wishes to expand its range of seating in order to differ from market competitors. Need for a more concrete foundation in research on sitting in the dental sector is also something they are looking for. The assignment therefore consists of developing an ergonomically designed seat for dental operator chairs, which has a strong foundation in research on sitting in the dental industry and has got a unique design. The project's pre-study starts with a literature study, with a large emphasis on trying to define what a good and ergonomic sitting posture is. This is done to provide a basis for a subsequent analysis of interviews and observations by dental staff. To survey the needs of the users, 15 interviews are performed with dental staff to gain an insight into their views of the workplaces and existing operator chairs. Structured observations are carried out at 11 patient visits in connection with the interviews to find motion patterns and review their work positions. The result of the preliminary study shows that many in dental care experience or has experienced work-related pain, especially shoulders, neck and back. A wide legged and relatively ergonomic working position is commonly observed in narrow operating rooms. The project results in 15 different concepts where four qualify for prototype manufacturing and testing. One concept is perceived to be the most comfortable while another is perceived to be the most unique. One concept meets ergonomic criteria best and another does not meet all the important requirements that the pre-study generated.

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Dias, Andrew Paul Lakshman Henry. « Aspects of the use and design of magnets in dentistry : y Andrew PaulLakshman Henry Dias ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31220782.

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Schmidgall, Matthew Akira. « THE DESIGN OF A MEDICAL-DENTAL BUILDING AT GOSHEN DRIVE AND THORNYDALE ROAD ». Thesis, The University of Arizona, 2009. http://hdl.handle.net/10150/192962.

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Foust, Kathleen M. « An examination of the present and future dental materials utilized in operative dentistry, and the impact on curriculum design in dental assisting programs ». Online version, 1999. http://www.uwstout.edu/lib/thesis/1999/1999foustk.pdf.

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Al, Mortadi Noor. « Computer Aided Design/Aided Manufacture/Additive Manufacturing applications in the manufacture of dental appliances ». Thesis, Cardiff Metropolitan University, 2014. http://hdl.handle.net/10369/6527.

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Hassan, Mohamed Ibrahim Abu. « An investigation, including the effect of cavity design, into the strength of porcelain ». Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265446.

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Dahmer, Heidi L. « The effects of toothbrush design on bacterial retention and viability a preliminary study / ». Morgantown, W. Va. : [West Virginia University Libraries], 1998. http://etd.wvu.edu/templates/showETD.cfm?recnum=308.

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Thesis (M.S.)--West Virginia University, 1998.
Title from document title page. Document formatted into pages; contains vii, 72 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 56-58).

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Dias, Andrew Paul Lakshman Henry. « Aspects of the use and design of magnets in dentistry : y Andrew Paul Lakshman Henry Dias ». Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21129514.

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Chen, Junning. « Biomechanics and Remodelling for Design and Optimisation in Oral Prosthesis and Therapeutical Procedure ». Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12831.

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The purpose of dental prostheses is to restore the oral function for edentulous patients. Introducing any dental prosthesis into mouth will alter biomechanical status of the oral environment, consequently inducing bone remodelling. Despite the advantageous benefits brought by dental prostheses, the attendant clinical complications and challenges, such as pain, discomfort, tooth root resorption, and residual ridge reduction, remain to be addressed. This thesis aims to explore several different dental prostheses by understanding the biomechanics associated with the potential tissue responses and adaptation, and thereby applying the new knowledge gained from these studies to dental prosthetic design and optimisation. Within its biomechanics focus, this thesis is presented in three major clinical areas, namely prosthodontics, orthodontics and dental implantology. In prosthodontics, the oral mucosa plays a critical role in distributing occlusal forces a denture to the underlying bony structure, and its response is found in a complex, dynamic and nonlinear manner. It is discovered that interstitial fluid pressure in mocosa is the most important indicator to the potential resorption induced by prosthetic denture insertion, and based on this finding, patient-specific analysis is performed to investigate the effects caused by various types of dentures and prediction of the bone remodelling activities. In orthodontic treatments, a dynamic algorithm is developed to analyse and predict potential bone remodelling around the target tooth during orthodontic treatment, thereby providing a numerical approach for treatment planning. In dental implantology, a graded surface morphology of an implant is designed to improve osseointegration over that of a smooth uniform surface in both the short and long term. The graded surface can be optimised to achieve the best possible balance between the bone-implant contact and the peak Tresca stress for the specific clinical application need.

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Alturki, Wesam. « Dental Decision Support and Training System for Attachment Selection in Removable Partial Denture Design ». Thesis, Rutgers The State Univ. of NJ, Rutgers Sch. of Health Professions, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=13424918.

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Background: Attachment selection in removable partial dentures (RPD) design is considered one of the most challenging treatment modalities in dentistry. Any error that occur during attachment selection due to lack of proper knowledge, overwhelming number of attachments, mistreatment, multiple adjustments and repairs could result in adverse clinical consequences, and significant inconvenience to the patient as well as financial implication to both patient and provider. Attachment selection is indeed very challenging for several reasons. Firstly, the topic itself has not been widely researched and published in dental literature, and therefore the best attachment selection still remains an area prone to high error rates in decision-making. Secondly, the complexity of the topic and lack of proper knowledge that requires sound knowledge of attachment principle, which spans multiple dental displaces of endodontic, orthodontics, periodontics and prosthodontics. Furthermore, now there are an over whelming number of attachments available in the market due to high patient demand for cosmetic and aesthetic dental enhancements. It is therefore extremely difficult for dental practitioners to readily recall an extensive list of factors that determine an appropriate attachment for RPD design. This is more as for dental education students, especially for students, residents, and less experienced clinician who may not possess the adequate education, training and competencies. Although clinical experts in the area of RPD design and attachment experience and skills may be able to assist with knowledge and years of experience they may not always be around or readily available. To address this problem and gab in the education and training of dental students, residents and practitioners seeking continuing education, we have developed a clinical support and training system for RPD attachment design and implementation based on dental experts’ knowledge and literature evidence-based clinical and practice guidelines.

Methodology: The RPD attachment clinical decision support system was developed using Exsys Corvid Core software. The knowledge based of the system was setup using dental experts’ and literature evidence-based practice guidelines. In all the knowledge base was successfully loaded with more than 100 rules representing many different clinical scenarios for variable types of attachment selection in RPD. For any new input attachment case, based on the information entered by the user, the system comes up with an appropriate evidence-based recommendation and treatment plan. To ensure that the clinical decision support and training system was indeed fully capable of training and educating dental students and residents it was validated by nine expert prosthodontics using a survey style questionnaire on the various aspects of the setup and functionality of the system. The questionnaire results were statistically evaluated using Cronbach’s Alpha Coefficient Test.

Results: The Cronbach’s Alpha reliability coefficient was 0.893, which represent a good internal consistency and indicates an overall agreement among the prosthodontic experts as to the need and viability of the system for training dental students and residents in the area of RPD attachment design. Likewise, the results of the validation questionnaire showed that all prosthodontics agreed that the system contained all of the most relevant factors for attachment selection in RPD design ensuring its utility for training and education in a real-world practice.

Conclusion: The clinical decision support and training system for RPD attachment design was successfully developed using Exsys Corvid Core software. Expert prosthodontists concurred that the system can be effectively employed for training dental student, inexperienced dentists and residents to select an appropriate attachment for RPD. It can be used to complement traditional teaching methods even in the absence of patients as part of a dental degree curriculum.

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Zanardi, Piero Rocha. « Avaliação da distribuição das tensões ao redor de implantes em diferentes níves de inserção ». Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/23/23150/tde-10062017-112029/.

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A perda óssea progressiva ao redor da plataforma dos implantes dentários é um desafio a ser vencido na clínica, uma vez que, interfere na manutenção e controle dos tecidos peri-implantares e pode afetar a estética. Esta pesquisa teve como objetivo avaliar a concentração de tensões ao redor de diferentes implantes dentários, variando a macrogeometria, conexão protética e profundidade da inserção da plataforma protética, sob carregamento axial ou oblíquo. Foram criados três modelos de resina fotoelástica para cada tipo de implante avaliado (hexágono externo, hexágono externo wedge, hexágono interno e cone Morse). Cada corpo de prova se diferenciou pelo posicionamento da plataforma do implante em relação à margem superior do bloco, em três posições diferentes: I - plataforma posicionada 2mm abaixo da margem do bloco; II - plataforma posicionada no mesmo nível da margem do bloco; III - plataforma posicionada 2mm acima da margem do bloco. Foi aplicada uma força de 100N através de um dispositivo instalado sobre pilares retos e angulados, simulando um carregamento axial e oblíquo respectivamente. Um total de 4 pontos foram avaliados de um lado do implante. Dados quantitativos foram coletados e utilizados para análise estatística. A regressão linear múltipla mostrou relação entre a distribuição das tensões com relação à profundidade de inserção independentemente do tipo de conexão protética ou do carregamento oclusal. O grupo I (2mm abaixo da margem) foi o que apresentou os menores valores (p<0.05) de tensão quando comparado com os outros grupos (II e III). De acordo com as limitações deste estudo pode-se concluir que a macrogeometria, profundidade de inserção da plataforma e tipo de carregamento oclusal influenciam no comportamento da distribuição das tensões ao redor dos implantes. Em relação à conexão protética, os resultados mostraram padrões de franjas semelhantes independentemente do tipo de conexão
The progressive bone loss at the neck of dental implant is a clinical concern since it affects the maintenance of dental esthetics. The stress concentration, the connection type and the microgap appear to be factors that cause alterations at the marginal bone level. The aim of this research was to evaluate the stress concentration around different dental implants, varying the macrogeometry, prosthetic connection and depth of the insertion of the prosthetic platform, under axial or oblique loading. Three blocks of photoelastic resin for each type of implant connection (external hexagon, external hexagon flattened, internal hexagon and Morse taper) were built. Each block differed in the position of the implant platform in relative to the upper margin of the block: I (2mm below), II (at the same level) and III (2mm above). A force of 100N was applied to both a straight and tilted abutments. A multiple linear regression showed the relation between the stress distribution and the insertion depth. For all the implant types, both with straight and tilted abutments, Group I presented the lowest stress concentration around the fixture when compared to group II and III (p<0,05). According to the limitations of this study it could be concluded that the macrogeometry, depth of insertion of the platform and type of occlusal loading influence the behavior of the distribution of stresses around the implants. Regarding the prosthetic connection, the results showed similar patterns of fringes regardless of the type of connection

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Steele, Timothy P. « Design and implementation of a patient tracking and recall system for Branch Dental Clinic Monterey ». Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23626.

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Dyson, John Edwin. « Aspects of the behaviour and design of dental high speed ball bearing air turbine handpieces ». Thesis, University of London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324587.

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Qutieshat, Abu-Baker S. « The design, build and validation of a realistic artificial mouth model for dental erosion research ». Thesis, University of Dundee, 2015. https://discovery.dundee.ac.uk/en/studentTheses/db05979d-8bdb-4b7e-b25c-0e51e8e01ee7.

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This work investigated the design parameters necessary for the build and use of an in vitro artificial mouth model built for dental erosion research. It also ascertained the working knowledge of dentists concerning the Human Tissue Act (HTA) and explored an alternative tissue for erosion-testing to human enamel. The design inputs for the artificial mouth were acquired by an innovative observational study conducted upon human volunteers and used in the decisions made in the setting of the fluids’ kinematic behaviour and how the associated devices were to function. This novel system was sought to mimic the interaction of saliva and the dental substrate during the process of consuming an erosive beverage. The model allows researchers to gather data using customizable experimental diets without the technical burden of dealing with a non-realistic regime. The design and build of the artificial mouth model along with its associated equipment and parameters are described and a manual for operation of the model is appended. The device is designed on a fully adjustable multitask basis in which the operator can set several variables such as the desirable salivary kinematic behaviour, offensive beverage flow rate, and volume of consumption. This, subsequently, allows the samples preloaded on the system to be tested for surface characteristics (i.e. surface hardness and surface profilometry) to determine the extent of erosion if any. The model also allows the resultant solution to be analysed for traces of calcium and phosphate ions. To validate the capabilities of the artificial mouth system a set of diets was performed repeatedly. The high degree of agreement and the consistency of results showed that the model is able to mimic realistic scenarios and is capable of producing reliable, reproducible and accurate outcomes. Ostrich eggshell proved to be a potential alternative erosion substrate which is fortuitous as the lack of knowledge on the HTA had meant human enamel was less readily available.

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Nuñez-Pantoja, Juliana Maria Costa. « Efeito do design da união soldada a TIG e a laser, em estruturas usinadas em liga de Ti-6AI-4V e fundidas em titânio comercialmente puro, sobre a resistência à ciclagem mecânica ». [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289900.

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Orientador: Marcelo Ferraz Mesquita
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
Made available in DSpace on 2018-08-17T15:29:22Z (GMT). No. of bitstreams: 1 Nunez-Pantoja_JulianaMariaCosta_D.pdf: 1479308 bytes, checksum: ee8715e20b041116b795969befba2c72 (MD5) Previous issue date: 2011
Resumo: Este estudo avaliou a resistência à ciclagem mecânica de estruturas confeccionadas em liga de Ti-6Al-4V e em Ti cp, submetidas à soldagem a laser (L) e ao procedimento TIG de soldagem (TIG), com variação de design das uniões, e correlacionar esses resultados com dados obtidos na análise radiográfica dessas soldas. Para o primeiro ensaio, foram obtidos 70 corpos de prova (halteres) usinados em liga de Ti-6Al-4V, com 3,5 mm de diâmetro de secção transversal e, para o segundo ensaio, outros 70 foram fundidos em Ti cp. Os corpos de prova foram seccionados em duas partes iguais e as partes a serem unidas foram limpas e alinhadas, segundo os designs da união: em "I", variando as distâncias de soldagem (0,0mm (I00) ou 0,6mm (I06)), ou em "X" (X). As variáveis design da união e tipo de soldagem foram cruzadas entre si formando um total de 6 grupos, que associadas ao grupo controle (intactos) totalizaram 7 grupos (n=10): G1- Intacto; G2- L/I00; G3- L/I06; G4- L/X; G5- TIG/I00; G6- TIG/I06; G7- TIG/X, para cada ensaio. Os corpos de prova foram soldados a laser utilizando-se 360V/8ms (X) e 390V/9ms (I00 e I06), com foco e freqüência regulados em zero. As soldas TIG foram realizadas utilizando-se os seguintes parâmetros de soldagem: 2:2 (X) e 3:2 (I00 e I06). As uniões receberam acabamento, polimento e foram submetidas à análise radiográfica (90 kV, 15 mA, 0,6 seg e 12 mm de distância), para verificação de poros no interior das soldas. Posteriormente, foi realizado o ensaio de resistência à ciclagem mecânica, e o número de ciclos até a fratura foi registrado. As superfícies de fratura foram analisadas em microscópio eletrônico de varredura. Os testes de Kruskal-Wallis e Dunn (?=0,05) mostraram que para ambos os procedimentos de soldagem, a pior maneira de se realizar a união se dá com I00, e a melhor, com X (p<0,05), para ambos os metais. Apenas para L, I06 foi tão resistente quanto X, tanto para o Ti cp quanto para Ti-6Al-4V. Quando são comparados os dois procedimentos de união, para os dois materiais, o teste de Mann-Whitney (?=0,05) mostrou haver diferença entre as soldas para I00 e I06, sendo que a união soldada a laser foi a mais resistente. Quando foram comparados os grupos com seus respectivos controles, notou-se que para o Ti-6Al-4V, nenhum grupo soldado foi tão resistente quanto os intactos; já para o Ti cp, os grupos com design X, para as duas soldas, foram tão resistentes quanto o controle, assim como o I06 soldado a laser. O coeficiente de correlação de Spearman (?=0,05) indicou correlação negativa entre número de ciclos resistidos e presença de poros nas radiografias das uniões dos materiais testados. Pode-se concluir que a união soldada com design em "X" dev0e ser empregada quando se pretende soldar a TIG corpos de prova de 3,5 mm de diâmetro de secção transversal. Quando é empregada a solda a laser, pode ser utilizado o design em "I" com 0,6 mm de espaçamento entre as partes, além do design em "X".
Abstract: The aim of this study was to evaluate the fatigue strength of Ti-6Al-4V alloy and pure titanium (cp TI) structures, submitted to laser (L) and TIG (TIG) welding procedures, varying the design of the joints, and correlate these results with joints radiographic analyses data. For the first test, 70 dumbbell rods with central diameters of 3.5 mm were obtained by lost-wax casting procedure in cp Ti, and others 70 were machined in Ti-6Al-4V alloy, for the second test. The specimens were sectioned in 2 equal parts, perpendicular to the rods long axis. The parts to be weld were cleaned and aligned according to joint designs: "I" design, varying welding distances (0.0 mm (I00) or 0.6 mm (I06)), or "X" (X) design. The variables joint design and type of welding were crossed creating 6 groups, that associated to the control group (intact), totaled 7 groups (n=10): G1- Intact; G2- L/I00; G3- L/I06; G4- L/X; G5- TIG/I00; G6- TIG/I06; G7- TIG/X, to each test. Laser-welding was executed using 360V/8ms (X) and 390V/9ms (I00 e I06) with focus and frequency regulated at zero. The TIG welding were executed using 2:2 (X) and 3:2 (I00 and I06) as welding parameters. The joints were finished, polished and submitted to radiographic examination (90 kV, 15 mA, 0.6 second and 12 mm of distance), for pores verification within the joints. Later, the rods were submitted to mechanical cyclic tests, and the number of cycles until fracture was recorded. The fracture surface was examined with a scanning electron microscope. Kruskal-Wallis and Dunn test (?=0.05) indicated that for both welding procedures, the worst way to perform the joint occurs with I00, and the best, with X (p<0.05), for both metals. To L, I06 was as resistant as X. When both type of welding are compared, to both materials, the Mann-Whitney test (?=0.05) indicates difference to I00 and I06, being the laser-weld joint the better one. When groups were compared with their respective control groups, it was noticed for Ti-6Al-4V that none of the joint groups was as resistant as the intact; on the contrary to cp Ti the "X" design groups, welded by TIG or L were as resistant as control, even as I06 laser-welded. The Spearman correlation coefficient (?=0.05) indicated a negative correlation between number of cycles and presence of porosity in radiographies of both materials. It could be concluded that the "X" design can be employed to weld 3.5 mm in diameter structures by laser or TIG welding procedure. When laser welding procedure is used, the "I" design with a space of 0.6 mm between parts can also be employed.
Doutorado
Protese Dental
Mestre em Clínica Odontológica

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Hirayama, Patrícia Mitiko Asanuma. « Efeito do jateamento com óxido de alumínio e uso de adesivo, no afrouxamento do parafuso de pilares protéticos cônicos, com indexador de restaurações implanto suportadas ». Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/23/23150/tde-04072013-164032/.

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O sucesso dos trabalhos protéticos, executados sobre os implantes osseointegrados, depende da estabilidade da conexão entre implante e pilar protético. Dentre as conexões protéticas existentes, as conexões cônicas têm demonstrado um desempenho melhor, tanto em termos mecânicos, como biológicos. A retenção friccional do pilar cônico é a grande responsável pela resistência aos movimentos laterais e oclusais da mastigação. Com a introdução de indexadores no desenho dessas conexões a característica mecânica mudou, levantando dúvidas em relação a sua atuação. Neste trabalho, avaliou-se o efeito do jateamento e uso do adesivo no torque de desaperto dessas conexões. Vinte e oito pilares synOCta® da marca Straumann® foram avaliados quanto ao torque de aperto inicial de 35 N.cm e torque de desaperto após ciclagem mecânica. Três grupos experimentais foram testados em relação ao grupo controle: modificação da superfície cônica por jateamento com óxido de alumínio, aplicação de adesivo entre as partes e o jateamento mais o adesivo. O grupo jateamento com aplicação do adesivo foi o único que apresentou valores de desaperto superiores quando comparado ao grupo controle. A rugosidade criada pelo jateamento, associada ao adesivo, elevou significantemente os valores de torque de desaperto do parafuso em comparação ao torque de aperto.
The success of the prosthetic work performed over dental implants depends on the stability of the connection between implant and abutment. Among the existing prosthetic connections, the conical connections have shown better performance, both mechanical and biological. The frictional retention of the morse taper is largely responsible for the resistance to lateral and occlusal movements of mastication. With the introduction of indexes in the design of these connections, the mechanical characteristic changed, raising doubts about its performance. In this study, we evaluated the effect of blasting and use of adhesive on abutment screw loosening torque of these connections. Twenty-eight synOcta® pillars Straumann® brand were evaluated for initial tightening torque of 35 N.cm and loosening torque after mechanical cycling. Three experimental groups were tested related to the control group: modification of the conical surface by blasting with aluminum oxide, aplication of adhesive between the parties and blasting added to the adhesive. The group blasted with adhesive application was the only one that showed values of loosening torque higher when compared to control group. The roughness created by blasting associated with the adhesive, significantly elevated values of abutment screw loosening torque against the tightening torque.

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Han, Hyung-Seop Lim Tae-Hong. « Design of new root-form endosseous dental implant and evaluation of fatigue strength using finite element analysis ». Iowa City : University of Iowa, 2009. http://ir.uiowa.edu/etd/294.

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Wu, Wen-Chou. « In vitro compressive fracture resistance of the human maxillary first premolar with different mod cavity design and restorative materials ». Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2007m/wu.pdf.

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Moulton, Ethan David. « Influence of drill guide type and operator experience on accuracy of dental implant placement ». Oklahoma City : [s.n.], 2006.

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38

Felber, Leo. « Automatische Verfahren zur Konstruktion von Inlays in der computergestützten Zahnrekonstruktion / ». [S.l.] : [s.n.], 1996. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11648.

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Fedorov, Valery V., Peter Hackl et Werner Müller. « Estimation and Experimental Design for Second Kind Regression Models ». Department of Statistics and Mathematics, WU Vienna University of Economics and Business, 1990. http://epub.wu.ac.at/86/1/document.pdf.

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Estimation procedures and optimal designs for estimation of the individual parameters and of the global parameters are discussed under various conditions of prior knowledge. The extension to nonlinear parametrization of the response function ís based on the asymptotical validity of the results for the linear parametrization. For the case where the error variance and the dispersion matrix are unknown, an iterative estimation procedure is suggested. An example based on dental plaque pH profiles demonstrates the improvement that is achieved (a) through using the optimal design or a design that ís close to the optimal, and (b) through taking into account prior information. (author's abstract)
Series: Forschungsberichte / Institut für Statistik

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Proos, Kaarel Andres. « Evolutionary structural optimisation as a robust and reliable design tool ». Thesis, The University of Sydney, 2002. http://hdl.handle.net/2123/519.

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Evolutionary Structural Optimisation (ESO) is a relatively new design tool used to improve and optimise the design of structures. It is a heuristic method where a few elements of an initial design domain of finite elements are iteratively removed. Such a process is carried out repeatedly until an optimum design is achieved, or until a desired given area or volume is reached. There have been many contributions to the ESO procedure since its conception back in 1992. For example, a provision known as Bi-Directional ESO (BESO) has now been incorporated where elements may not only be removed, but added. Also, rather than deal with elements where they are either present or not, the designer now has the option to change the element's properties in a progressive fashion. This includes the modulus of elasticity, the density of the material and the thickness of plate elements, and is known as Morphing ESO. In addition to the algorithmic aspects of ESO, a large preference exists to optimise a structure based on a selection of criteria for various physical processes. Such examples include stress minimisation, buckling and electromagnetic problems. In a changing world that demands the enhancement of design tools and methods that incorporate optimisation, the development of methods like ESO to accommodate this demand is called for. It is this demand that this thesis seeks to satisfy. This thesis develops and examines the concept of multicriteria optimisation in the ESO process. Taking into account the optimisation of numerous criteria simultaneously, Multicriteria ESO allows a more realistic and accurate approach to optimising a model in any given environment. Two traditional methods � the Weighting method and the Global Criterion (Min-max) method have been used, as has two unconventional methods � the Logical AND method and the Logical OR method. These four methods have been examined for different combinations of Finite Element Analysis (FEA) solver types. This has included linear static FEA solver, the natural frequency FEA solver and a recently developed inertia FE solver. Mean compliance minimisation (stiffness maximisation), frequency maximisation and moment of inertia maximisation are an assortment of the specific objectives incorporated. Such a study has provided a platform to use many other criteria and multiple combinations of criteria. In extending the features of ESO, and hence its practical capabilities as a design tool, the creation of another optimisation method based on ESO has been ushered in. This method concerns the betterment of the bending and rotational performance of cross-sectional areas and is known as Evolutionary Moment of Inertia Optimisation (EMIO). Again founded upon a domain of finite elements, the EMIO method seeks to either minimise or maximise the rectangular, product and polar moments of inertia. This dissertation then goes one step further to include the EMIO method as one of the objectives considered in Multicriteria ESO as mentioned above. Most structures, (if not all) in reality are not homogenous as assumed by many structural optimisation methods. In fact, many structures (particularly biological ones) are composed of different materials or the same material with continually varying properties. In this thesis, a new feature called Constant Width Layer (CWL) ESO is developed, in which a distinct layer of material evolves with the developing boundary. During the optimisation process, the width of the outer surrounding material remains constant and is defined by the user. Finally, in verifying its usefulness to the practical aspect of design, the work presented herein applies the CWL ESO and the ESO methods to two dental case studies. They concern the optimisation of an anterior (front of the mouth) ceramic dental bridge and the optimisation of a posterior (back of the mouth) ceramic dental bridge. Comparisons of these optimised models are then made to those developed by other methods.

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Proos, Kaarel Andres. « Evolutionary structural optimisation as a robust and reliable design tool ». University of Sydney. Aerospace, 2002. http://hdl.handle.net/2123/519.

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Evolutionary Structural Optimisation (ESO) is a relatively new design tool used to improve and optimise the design of structures. It is a heuristic method where a few elements of an initial design domain of finite elements are iteratively removed. Such a process is carried out repeatedly until an optimum design is achieved, or until a desired given area or volume is reached. There have been many contributions to the ESO procedure since its conception back in 1992. For example, a provision known as Bi-Directional ESO (BESO) has now been incorporated where elements may not only be removed, but added. Also, rather than deal with elements where they are either present or not, the designer now has the option to change the element's properties in a progressive fashion. This includes the modulus of elasticity, the density of the material and the thickness of plate elements, and is known as Morphing ESO. In addition to the algorithmic aspects of ESO, a large preference exists to optimise a structure based on a selection of criteria for various physical processes. Such examples include stress minimisation, buckling and electromagnetic problems. In a changing world that demands the enhancement of design tools and methods that incorporate optimisation, the development of methods like ESO to accommodate this demand is called for. It is this demand that this thesis seeks to satisfy. This thesis develops and examines the concept of multicriteria optimisation in the ESO process. Taking into account the optimisation of numerous criteria simultaneously, Multicriteria ESO allows a more realistic and accurate approach to optimising a model in any given environment. Two traditional methods � the Weighting method and the Global Criterion (Min-max) method have been used, as has two unconventional methods � the Logical AND method and the Logical OR method. These four methods have been examined for different combinations of Finite Element Analysis (FEA) solver types. This has included linear static FEA solver, the natural frequency FEA solver and a recently developed inertia FE solver. Mean compliance minimisation (stiffness maximisation), frequency maximisation and moment of inertia maximisation are an assortment of the specific objectives incorporated. Such a study has provided a platform to use many other criteria and multiple combinations of criteria. In extending the features of ESO, and hence its practical capabilities as a design tool, the creation of another optimisation method based on ESO has been ushered in. This method concerns the betterment of the bending and rotational performance of cross-sectional areas and is known as Evolutionary Moment of Inertia Optimisation (EMIO). Again founded upon a domain of finite elements, the EMIO method seeks to either minimise or maximise the rectangular, product and polar moments of inertia. This dissertation then goes one step further to include the EMIO method as one of the objectives considered in Multicriteria ESO as mentioned above. Most structures, (if not all) in reality are not homogenous as assumed by many structural optimisation methods. In fact, many structures (particularly biological ones) are composed of different materials or the same material with continually varying properties. In this thesis, a new feature called Constant Width Layer (CWL) ESO is developed, in which a distinct layer of material evolves with the developing boundary. During the optimisation process, the width of the outer surrounding material remains constant and is defined by the user. Finally, in verifying its usefulness to the practical aspect of design, the work presented herein applies the CWL ESO and the ESO methods to two dental case studies. They concern the optimisation of an anterior (front of the mouth) ceramic dental bridge and the optimisation of a posterior (back of the mouth) ceramic dental bridge. Comparisons of these optimised models are then made to those developed by other methods.

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Lööf, Jesper. « Calcium-Aluminate as Biomaterial : Synthesis, Design and Evaluation ». Doctoral thesis, Uppsala University, Department of Engineering Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9173.

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In this thesis different aspects of calcium-aluminate (CA) as biomaterial are presented. Calcium aluminate is a chemically bonded ceramic with inherent properties making it suitable for use as biomaterial in some applications. In this thesis the emphasis is put on the basic chemical, physical and mechanical properties that may be achieved using the CA system as well as synthesis of the CA raw material. The basis for using CA in any application is the synthesis of the raw material. Different synthesis routes for producing CA are presented with focus on high temperature routes and the micro-structural and phase development during synthesis. As a base for further understanding of the CA properties a thorough outline of the reaction chemistry for CA is presented also including a description of how the reactions may be controlled and how formulations can be designed. The surface reactions of CA when subjected to simulated body fluid showed that CA is in vitro bioactive. An in vivo study in teeth also indicates that CA produces apatite at the tooth material interface. Dental materials are subjected to a harsh environment in the mouth with high mechanical forces, erosion and thermal changes. Also the demands on precise handling characteristics are high. For these reasons the in vitro evaluation of physical and mechanical properties are important. In this work several mechanical and physical properties of Ca-based formulations for dental applications has been tested using different methods. Some attention is also put on the specific characteristics of CA and the difficulties that arise when new material classes needs to be tested according to consensus standard methods. Finally studies on a CA-based formulation intended for Vertebroplasty is presented. The studies include basic mechanical properties as well as testing the material in an in vitro model utilising synthetic cancellous bone.

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Stegeman, Cynthia A. « The Effect of a Multimedia Learning Environment on the Knowledge, Attitude, Confidence, and Skill of Dental Hygiene Students ». University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1307442204.

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Guo, Jian-Ting, et 郭建廷. « Optimal Design of Dental Implants ». Thesis, 2015. http://ndltd.ncl.edu.tw/handle/79345573353994469518.

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碩士
健行科技大學
機械工程系碩士班
103
The main intention for this study is to explore the design parameters of the root explants for stress effects of alveolar bone surrounding tissue. The length, diameter, taper and thread pitch of root explants as design parameters, using finite element analysis Taguchi method of experimental design rule can quickly identify the root explants to optimize the design parameters. According to study results showed that the maximum stress occurs at the convergence at dense bone and the root of the neck. The root explants of diameter of 6mm, length of 14mm, taper of 0&;#8728;and pitch width of 0.5mm can effectively reduce the maximum stress in the bone and reduce excessive bone loss around the artificial tooth root and improve the success rate of implants.

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Chung, Yu-Lin, et 鍾侑霖. « A projective LED dental lamp design ». Thesis, 2011. http://ndltd.ncl.edu.tw/handle/78874999768202695945.

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碩士
國立中山大學
機械與機電工程學系研究所
99
Halogen lamps are mostly applied as a light source to the traditional lamp for medical treatment due to its proper color temperature, but it has its disadvantages such as ultraviolet rays and infrared rays which will be harmful to the patients and faculties in the hospitals under long-term exposure. Consequently, using light emitting diode(LED) as a new light source instead of the traditional halogen lamp will be the trend of the future. The purpose of this study is to design a projective LED dental lamp that can achieve the goals of 200mm×100mm for light shape and 11000lux illuminance energy by using the optics simulation software, LightTools. Firstly, a single LED lamp module with a high focusing hollow tubular light guide structure was designed and developed comparing with the solid light guide structure used in many commercial projective dental lamp, the hollow tubular light guide structure can decrease illuminance energy lose due to the absorption by tube material. Because the required objective light shape could not be achieved by using the designed light guide structure only, so a lens component was adopted and designed in order to shrink the output light shape to the required size. Finally, through the specific arrangement of position and angle of each LED lamp module, a projective LED dental lamp with 9 LEDs lamp modules which conform with the required illuminance energy was proposed.

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46

SHARMA, RISHAV K. « DESIGN OF 3D PRINTER FOR DENTAL DESIGN AND FABRICATION ». Thesis, 2022. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19213.

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The project aims to work in the medical field, using 3D printing technology of state-of-the art technology. With the advancement of 3D imaging technology and modeling such as cone beam computed tomography and intra - oral scanning, as well as the longest history of the use of CAD CAM technology in dentistry, technology will become more important. Guidelines for piercing dental implants, portable models of prosthodontics, orthodontics, and surgery, dental and orthopaedic implants, and duplicate and dental implants are all examples of 3D printing applications. The advantages of 3D printing technology include efficient use of materials and the ability to create one complex shape; however, the disadvantages include high cost and processing after extensive processing.

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47

Chiu, Sheng-Hui, et 邱聖惠. « The Product Design of Dental Health Insurance ». Thesis, 2014. http://ndltd.ncl.edu.tw/handle/81902670021378299218.

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碩士
真理大學
統計與精算學系碩士班
102
People neglect oral hygiene because of oral diseases misconceptions. According to the Statistics of Bureau of Health, R.O.C., for population with age during 15 and 64, dental caries and periodontal disease prevalence have reached 90%. Everyone has 6 to 10 cavities in average, 35% of those people has the problem of missing teeth, the edentulous rate of more than 65 years old increases to 47.2%. Empirical data show that the lack of chewing teeth can be a considerable impact, which causes nutritional problems, and also affects people's social life. Although the national health insurance has covered cleanings, fillings, root canal treatment and tooth extraction, but not dentures and dental implant benefits. Losing in general tooth loss caused by disease (caries, periodontal disease, etc.) is not covered by insurance. The purpose of this paper is to design the dentures or dental implants medical insurance product. This paper uses one million sampling data from national health insurance research database in 2005, to predict missing tooth rate. Methods include Lee-Carter model to predict, K-S test to test data consistency, and take MAPE for evaluation of model fit and prediction. Then we use Whittaker smoothing method to smooth the rate of tooth loss. Finally, the calculation of the net pure premiums of varies assumed dental products. Study found that the rate of tooth loss using Lee-Carter model, the fit and prediction on MAPE value performance is very good. In the next 50 years, the rate of tooth loss shows steady patterns. Finally, two kinds of insurance products have designed, one is for dentures, and the other one is for dental implant. The study also found the premium difference by sex of these insurance products.

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48

Liu, Yen-Tsung, et 劉燕宗. « Design of the dental LED lamp system ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/77502963950745439088.

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碩士
義守大學
機械與自動化工程學系碩士班
98
A reflective dental operating lamp for medical treatment using LED as a light source has been proposed and studied in this research. At present, halogen lamps are the most conventional light sources for the reflective dental operating lamp, and have the disadvantage of energy wasting due to the high working temperature. The light-emitting diode (LED) has the advantages of good color rendering, low color temperature, strong directional lighting property and good durability. The LED light will not cause damages to patients, and can provide a good color temperature on the wounds for dentists to have correct judgments. Because the total illumination of a single LED is not as good as a conventional halogen lamp, LED operating lamps for medical treatments have to use a reflector cavity with multi-curved surfaces to enhance the focusing performance and lighting efficiency. The design is based on the multi-curved surfaces formulae and the optic geometry of ray traces. Different boundary conditions such as the curvatures of the reflector cavity and the locations of the light source were also considered. Firstly, the amounts of multi-curved surfaces on the reflector cavity have been designed to be the same dimension in order to find out the optimum value. Secondly, the reflector cavity with different dimensional multi-curved surfaces has been designed to achieve the adequate light shape and illumination. Then, a prototype of the LED reflective dental operating lamp for medical treatment has been fabricated and compared with the simulation result in order to verify the accuracy of the simulation data. Eventually, the design process for the LED reflective dental operating lamp for medical treatment was accomplished.

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Lue, Yung-Chi, et 呂詠淇. « Ergonomic Design for The Dimension of Dental Handpieces ». Thesis, 2014. http://ndltd.ncl.edu.tw/handle/66805550237905514265.

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碩士
國立高雄第一科技大學
機械與自動化工程研究所
102
There are many differences between different regions and races on body sizes and proportions. Especially likes dentist use of the wrong size handpieces in long time.Using of the handpieces with incorrect wrist posture. Cause human disease or cumulative musculoskeletal injuries of the hand. Lead to the occurrence of medical malpractice. In this study, the size of the high-speed turbine handpiece design improvements: (1) Integration of human factors design literature and information, carry out collection and collation, including: hand tools design principles, anthropometric data, analyze hand movements, such as the use of comfort to explore, construct initial phone prototype. (2) Analyzed with different level of hand anthropometric data from the database and identify its association with the differences, in order to facilitate design and analysis. (3) Combining axiomatic design method to derive the mathematical model, the establishment of a complete set of dental handpieces design and integrate it into a set of methods designed system that corresponds to the size of the body can be measured in different parts of the information through the input and output best suited the grip size. This study can reduce engineers in product design and development time, in addition to improving the mechanical technology upgrading, but also can help designers save on human engineering, biomechanics, and computer graphics professional domain knowledge in the development and design time to help designers to most quick access to the best product design, increasing the competitiveness of products and sales.

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Shih, Wei-Ting, et 施威廷. « Design and Control of Dental Implant Auxiliary Device ». Thesis, 2013. http://ndltd.ncl.edu.tw/handle/45497867108772811179.

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碩士
國立交通大學
機械工程系所
101
Dental implant surgery in today’s medical still has no national health insurance benefits, and the whole process takes a long time. If the surgery accidentally failed not only affects its usefulness or beauty, but also may incur a lot of medical disputes. The objective of this study is using computer-aided systems and device to increase the success rate of the implant surgery, by controling devices position and the angle of motor rotation. This study includes two main parts. The first is the design of ultrasonic motor (USM) controllers and improving the motor actuator stage. The other one is the design of a Z-axis actuator and its controller. The actuator stage consists of six ultrasonic motors to become a six degree-of-freedom actuator stage. Displacement and rotation along X and Y axes are achieved by using six USMs actuation combination for variations of the displacement and angle when implant surgery needs. This study designs a double-feedback PID controller for the USM stage to improve the position accuracy and to reduce settling time and overshoot in transient response. Concerning the Z-axis actuator, this study uses a linear stepping motor that implants with screw motion. To prevent the lead screw, which is on the stepping motor, implanting too deep and getting hurt, this study designed a controller to control the lead screw depth by calculation based on the rotary angle and pitch of the lead screw. The author has designed and fabricated a prototype in order to measure device performance.

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