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1
Berekally, Thomas L. "Some aspects of Maryland Bridge treatments : an 'in-vivo' and 'in-vitro' study." Title page, contents and summary only, 1989. http://web4.library.adelaide.edu.au/theses/09DM/09dmb487.pdf.
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ANDO, YUSUKE, MASAKI J. HONDA, HAYATO OHSHIMA, AKIKO TONOMURA, TAKAYUKI OHARA, TOSHIMITSU ITAYA, HIDEAKI KAGAMI, and MINORU UEDA. "THE INDUCTION OF DENTIN BRIDGE-LIKE STRUCTURES BY CONSTRUCTS OF SUBCULTURED DENTAL PULP-DERIVED CELLS AND POROUS HA/TCP IN PORCINE TEETH." Nagoya University School of Medicine, 2009. http://hdl.handle.net/2237/11336.
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Atta, M. O. A. "A comparative study of the bond strength of chemical and mechanical retention systems for direct bonded bridge retainers." Thesis, King's College London (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320471.
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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.
Full textAbstract:
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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Lima, Lívia Bonjardim. "Impacto do número de implantes empregados em protocolos mandibulares - Revisão sistemática." Universidade Federal de Uberlândia, 2017. https://repositorio.ufu.br/handle/123456789/18207.
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Objetivo: Avaliar pacientes reabilitados com prótese tipo protocolo mandibular
e analisar o impacto do diferente número de implantes utilizados na taxa de
sobrevivência dos implantes, perda óssea marginal e sobrevivência das
próteses. Material e métodos: Esta revisão sistemática foi conduzida segundo
orientações do PRISMA e registrada sob número de registo CRD42016048523
(PROSPERO). A base de dados electrônica PubMed/MEDLINE foi pesquisada
para artigos publicados até 17 de julho de 2016 sem restrições quanto ao ano de
publicação e teve como objetivo responder a seguinte pergunta em formato
PICO: "Em pacientes desdentados, protocolos mandibulares suportados por três
implantes, comparados com diferente número de implantes, mostram taxa de
sobrevivência de implantes, perda óssea marginal e sobrevivência da prótese
satisfatórios?" Os estudos foram avaliados segundo os níveis de evidência
OCEBM e a qualidade metodológica foi avaliada de acordo com a escala
MINORS e ferramenta de risco de viés Cochrane. Foi realizada a estatística
descritiva quando aplicável. Curvas de sobrevivência para os implantes foram
construídas com o metódo de Kaplan Meyer e a perda óssea marginal foi
analisada pelos testes de kruskal-Wallis, Dunn’s e Mann Whitney. Resultados:
21 estudos foram incluídos na síntese quantitativa. 4712 implantes e 1245
protocolos mandibulares foram examinados em 1245 pacientes. Os resultados
foram agrupados em categorias com base no número de implantes instalados
em cada paciente: grupo 1 (três implantes) mostrou uma taxa de sobrevivência
do implante de 90%, grupo 2 (4 implantes) apresentou 95% e o grupo 3 (cinco
implantes) atingiu a menor taxa de sobrevivência do implante (74%). Os grupos
1 e 3 apresentaram os menores valores de perda óssea no primeiro ano (0,73 e
0,70 mm respectivamente), com diferença estatisticamente significante do grupo
2 que registrou mediana = 1,31 mm (p = < 0,001). Conclusão: Apesar das
limitações quanto à falta de estudos de elevado nível de evidência e da própria
metodologia da pesquisa por termos MeSH, pôde-se concluir que protocolos
mandibulares suportados por três implantes demonstraram sobrevivência de
implantes e perda óssea marginal no primeiro ano satisfatórios. A sobrevivência
de próteses, no entanto, foi inferior aos demais grupos e isto sugere um maior acompanhamento de tais reabilitações a fim de esclarecer dados e buscar
soluções.Purpose: To assess edentulous patients rehabilitated by implant-supported mandibular full-arch bridges and to analyze the impact of the different number of implants used on implant survival rate, bone loss around the fixtures and prosthesis survival rate. Material and methods: This systematic review followed PRISMA guidelines and was registered on PROSPERO (registration number CRD42016048523). PubMed/MEDLINE electronic database was searched for articles published up until July 17th, 2016 without restrictions about publication year and aimed to answer the following question in PICO format: “In edentulous patients, full arch-bridges supported by three implants, compared to those with different number of implants, show satisfactory implant survival rate, bone loss and prosthesis survival rate?” Evidence level of studies were evaluated according to OCEBM e the methodological quality by MINORS scale and Cochrane Risk of Bias Tool. Descriptive statistics was performed when applicable. Implant survival curves were constructed with Kaplan-meyer method and marginal bone loss was analyzed with kruskal-Wallis, Dunn’s and Mann Whitney tests. Results: 21 studies were enrolled. Overall, 4712 implants and 1245 implant-supported fullarch bridges were examined in 1245 patients. Results were grouped on categories based on the number of fixtures on each patient: Group 1 (three implants) showed an implant survival rate of 90%, Group 2 (four implants) presented 95% and the Group 3 (five implants) reached the lowest implant survival rate (74%). Group 1 and Group 3 showed the lowest values of first year bone loss (0.73 and 0.70 mm respectively), statistically significant different of Group 2 that registered median = 1,31mm (p = <0.001). Conclusion: Despite of the limitations regarding the lack of high level of evidence studies and the methodology of MeSH terms research itself, it was concluded that full archbridges supported by three implants show satisfactory implant survival rate and first year bone loss. The prosthesis survival rate, however, was inferior to the other groups and this suggests a bigger follow-up of these rehabilitations with the aim of clarifying data and search for solutions.
Dissertação (Mestrado)
7
GALIZA, JOSE ALEX GONCALVES DE. "RESISTANCE ANALYSIS OF FIXED ZIRCONIA BRIDGES APPLIED IN SCREWED DENTAL PROSTHESIS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2014. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24242@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
Esse trabalho teve como objetivo principal avaliar a resistência à falha da infraestrutura de uma prótese parcial fixa em zircônia de três elementos e aparafusada sobre implantes, através de análise de tensões por elementos finitos e determinação da resistência à fadiga da estrutura. Como objetivo secundário, foram avaliadas as distribuições das tensões nos demais componentes da prótese. Na análise de tensões, dois modelos distintos foram gerados, sendo o primeiro com prótese, implantes e parafusos similares àqueles adotados na clínica odontológica. Um segundo modelo, usado como controle, adotou uma geometria simplificada. As cargas mastigatórias foram aquelas usuais da literatura especializada e a análise por elementos finitos foi realizada através do programa Ansys Workbench 14.5. Os resultados das distribuições de tensões mostraram semelhanças entre os dois modelos, com pequenas variações relacionadas às geometrias empregadas. As tensões calculadas ficaram abaixo dos limites de resistência mecânica da zircônia e das ligas de titânio. No cálculo da vida em fadiga da prótese de zircônia um modelo analítico foi adotado prevendo uma vida infinita para o componente.
The main goal of this work was to evaluate the failure resistance of a zirconia fixed partial denture of three elements screwed on implants by means of a finite element stress analysis and the determination of the fatigue strength of the structure. As a secondary objective, the stress distributions in the other components of the prosthesis were evaluated. In order to promote the stress analysis, two different models were generated, the first making use of prosthesis, implants and screws similar to those adopted in the dental clinic. A second model, used as control, adopted a simplified geometry. The masticatory loads were those presented usually in the literature and finite element analysis was performed making use of Ansys Workbench 14.5 program. The stress distribution results showed similarity in both models, with small variations related to the adopted geometries. The calculated stresses were smaller than the ultimate strength of the zirconia and titanium alloys. Concerning the fatigue life of the zirconia prosthesis an analytical model was adopted and estimated an infinite life for the component.
8
Sykes, David. "Cast-Metal Resin Bonded Bridges: A Laboratory And Clinical Study." Thesis, The University of Sydney, 1986. http://hdl.handle.net/2123/4879.
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Huskisson, Darren Charles. "The air bridge denial program and the shootdown of civil aircraft under international law /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81471.
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In August 2003, the United States resumed the sharing of real-time intelligence with Colombia, information that will be used by Colombia to shoot down aircraft engaged in drug trafficking. A similar program with Peru may restart soon. Such operations are part of the Air Bridge Denial Program (ABDP), a program that has been operating since the early 1990s designed to cut off the flow of drug out of the Andean Region of South America.This thesis examines the history of the ABDP and the norms applicable to shootdown operations under the UN Charter, customary international law, the Chicago Convention, and human rights law to determine the specific limitations of the prohibition. International law generally prohibits the shootdown of international civil aircraft, and the nature of the shootdown operations can also have human rights implications.
This thesis then examines the circumstances under which international law would excuse an otherwise unlawful shootdown of a civil aircraft. Self-defense, the law of armed conflict and distress are ruled out as likely candidates for use in the legal justification of the shootdown of drug aircraft.
The best defense for the conduct of ABDP shootdowns is the defense of necessity as it exists under customary international law. The potential harm to the essential interests of States threatened by drug trafficking combined with the unique nature of the drug trade in the Andean Region is the ideal situation for the invocation of necessity and provides the most sound international legal justification for the conduct of shootdown operations in this context.
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Hasan, Dalal. "Personality characteristics of dental students in Kuwait University associated with preferred teaching methods." Scholarly Commons, 2020. https://scholarlycommons.pacific.edu/uop_etds/3671.
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This study examined personality characteristics of dental students at Faculty of Dentistry at Kuwait University and investigated the relationships between personality characteristics of these students and their preferred teaching methods. In order to assess personality characteristics, The Myers-Briggs Type Inventory (MBTI) was used. For teaching method categorization Grasha’s (2002) classification was used. This research builds knowledge about personality traits as measured by the Myers-Briggs Type Inventory® of dental students in Kuwait. Further, it adds knowledge about teaching methods preferred by dental students. Two surveys, the Myers- Briggs Type Indicator® Form M and a brief learning preference for teaching methodology survey, served as data collection instruments. Twenty-seven out of 43 dental students were interested in participation. Twenty-three (53.4%) students completed both surveys. After the data were analyzed, no dominant personality types among the dental students surveyed was uncovered. There were, however, four types slightly more represented than others. This study did find some correlations between certain subgroups and preferences for teaching methods. The study also found that students perceived Hybrid and Demonstrator methods as both the most preferred and most beneficial. Overall, the findings support that there is association between personality and preferences of teaching method and there is a preference of a teaching method over the other in dental education in general.
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Hasala, Robert. "Model dentálního můstku vyztuženého vláknovým kompozitem." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2014. http://www.nusl.cz/ntk/nusl-217044.
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The diploma thesis aimed to changes of mechanical properties in the influence the use of geometry reinforcement, time delay between cure and measurement. Mechanical properties of model dental bridge observed effect of hydrothermal stress. Dental bridges were reinforced two types of Fiber Reinforced Composites. The first reinforcement had straight unidirectional orientation. The second reinforcement had multidirectional orientation. Mechanical testing was realized in the dependence at the force to deformation model of the dental bridge. Conversion was counted pursuant photo DSC measurement. The character of break was observed at SEM pictures and macro photos. Type of material and reinforcement fibers and their combination had important role at the mechanical properties.
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Boswell, John Bentley. "A history of the air bridge denial program in Peru: the evolution, errors, and fallout of a covert United States-Peruvian counternarcotics air interdiction program, culminating with the 2001 mistaken shootdown of a missionary plane over the Amazon jungle." Master's thesis, Pontificia Universidad Católica del Perú, 2019. http://hdl.handle.net/20.500.12404/15345.
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During the 1990s, the Governments of Peru and the United States established a
counternarcotics air interdiction program called Air Bridge Denial over the Peruvian Amazon.
During this program the United States Central Intelligence Agency conducted surveillance
missions over Peru’s coca growing regions, and passed suspicious aircraft location data to the
Peruvian Air Force, who would then intercept the suspected narcotrafficking aircraft and force
them to land or be shot down. The program was interrupted in 2001 following the accidental
shootdown of a missionary floatplane over Peru, which resulted in the deaths of two United
States citizens. This thesis examines the development, operations, and fallout of Air Bridge
Denial in Peru, including its patterns of errors, complexities and challenges such as binational
interoperability, bilingual communications failures, neglect of mandatory protocols, and poor
oversight. In examining the detailed history of Air Bridge Denial, this thesis strives to present
lessons learned for the development and implementation of any similar programs in the future.
Disclaimer: The views in this paper are strictly those of the author, and do not necessarily
reflect the official views of the U.S. Government, the Department of Defense, or any of its
agencies, nor the Olmsted Foundation. Moreover, all of the government sources used for this
thesis are from open source and unclassified public archives, and from sources readily available
to the public through open web searches and periodicals, including documents released under the
U.S. Freedom of Information Act (FOIA). This is in fact an admitted limitation to the study, as
there may be additional government information, included classified archives, from both the U.S.
and Peru that might provide greater detail and insight. The author does not know this to be a fact
or not. The publicly available information at hand may at least help fill gaps in the historical
academic record surrounding the program, and open the door for continued study on the topic.Tesis
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Pavanello, Renata Eliza. "Avaliar a interfer?ncia do condicionamento ?cido com ?cido fosf?rico na resist?ncia de uni?o do sistema adesivo universal na dentina afetada por c?rie." Pontif?cia Universidade Cat?lica de Campinas, 2018. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/1029.
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The aim of this paper was to evaluate the influence of acid etching on the bond strength of the universal adhesive system in caries-affected-dentin. For this experimental study, 40 erupted permanent third molars were selected at the Dental Clinic of the PUC-Campinas with Free and Informed Consent Term signed by the patients. Removal of the occlusal third with double - sided diamond disc and flat dentin surfaces obtained by sanding was done. The lesion of the caries was developed by microbiological method with S. mutans strain ATCC25175. The teeth were divided into 4 groups (n = 10): AF-I: phosphoric acid conditioning and application of the Universal Single Bond adhesive system - immediate microtensile test; AF-DC: phosphoric acid conditioning and application of the Universal Single Bond adhesive system and microtensile test after cariogenic challenge; SAF-I: application of the Universal Single Bond adhesive system without acid etching and immediate microtensile test and SAF-DC: application of the Universal Single Bond adhesive system without acid etching and microtensile test after carig?nico challenge. A composite resin block was made in the affected dentin. Each tooth / adhesive / resin block was sectioned with diamond discs coupled to the Isomet cutting machine in parallel planes obtaining test pieces in the shape of sticks, with a cross-sectional area of 1 mm2. Microtensile test was performed. Only adhesive / mixed fractures were considered for bond strength calculation. The results were evaluated by the Kruskal-Wallis test (Student-Newman-Keuls) and Friedman. The higher bond strength occurred in the groups in which the phosphoric acid conditioning was done (p <0.05). There was no significant difference in union strength after cariogenic challenge (p> 0.05). The type of fracture was predominantly adhesive. It was concluded that phosphoric acid caused increased bond strength of the Universal Single Bond adhesive system in caries affected dentin and the cariogenic challenge did not interfere in the bond strength of the Universal Single Bond adhesive system in dentin affected by caries.
O objetivo deste trabalho foi avaliar a interfer?ncia do condicionamento ?cido na resist?ncia de uni?o do sistema adesivo universal na dentina afetada por c?rie. Para este estudo de car?ter experimental foram selecionados 40 terceiros molares permanentes erupcionados com Termo de Consentimento Livre e Esclarecido assinado pelos pacientes na Cl?nica Odontol?gica da PUC-Campinas. Foi feita a remo??o do ter?o oclusal com disco diamantado dupla face e superf?cies dentin?rias planas obtidas atrav?s de lixamento. A les?o de c?rie foi desenvolvida pelo m?todo microbiol?gico com cepa padr?o S. mutans ATCC25175. Os dentes foram divididos aleatoriamente em 4 grupos (n=10): AF-I: condicionamento com ?cido fosf?rico e aplica??o do sistema adesivo Single Bond Universal - teste imediato de microtra??o; AF-DC: condicionamento com ?cido fosf?rico e aplica??o do sistema adesivo Single Bond Universal e teste de microtra??o ap?s desafio cariog?nico; SAF-I: aplica??o do sistema adesivo Single Bond Universal sem condicionamento ?cido e teste imediato de microtra??o e SAF-DC: aplica??o do sistema adesivo Single Bond Universal sem condicionamento ?cido e teste de microtra??o ap?s desafio carig?nico. Um bloco de resina composta Charisma foi confeccionado na dentina afetada. Cada bloco dente/adesivo/resina foi seccionado com discos diamantados acoplados a m?quina de corte Isomet em planos paralelos obtendo corpos de prova em forma de palitos, com ?rea de sec??o transversal de 1 mm2. Para realiza??o do teste de microtra??o. Apenas fraturas adesivas /mistas foram consideradas para c?lculo de resist?ncia de uni?o. Os resultados foram avaliados pelo teste Kruskal-Wallis (Student-Newman-Keuls) e Friedman. A maior resist?ncia de uni?o ocorreu nos grupos em que foi feito o condicionamento com ?cido fosf?rico (p<0.05). N?o houve diferen?a significante na resist?ncia de uni?o ap?s o desafio cariog?nico (p>0.05). O tipo de fratura predominante foi adesiva. Pode-se concluir que o ?cido fosf?rico acarretou aumento na resist?ncia de uni?o do sistema adesivo Single Bond Universal na dentina afetada por c?rie e o desafio cariog?nico n?o interferiu na resist?ncia de uni?o do sistema adesivo Single Bond Universal na dentina afetada por c?rie.
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Pan, Yue Ming. "Tensile bond failures of resin-bonded bridge adhesives." 1986. http://books.google.com/books?id=5aY9AAAAMAAJ.
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Hsu, Pei-Chi, and 許珮琦. "Influences of surface treatments on the adhesion of zirconia dental bridge." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/3jp9ua.
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碩士國立臺北科技大學
材料科學與工程研究所
99
Zirconia ceramic (Y-TZP, 3M LAVA) dental bridge with resin-cement adhesive bonding strength is weak, that purpose to enhance dental bridge fixed effect. The aim of the study was to modify 3M LAVA zirconia ceramic surface by Al2O3 sandblasting, acid etching and coating treatment methods, enhancing 3M LAVA zirconia ceramic surface roughness and improving zirconia/resin-cement bonding surface area. Those surface treated specimens were analyzed by average surface roughness, there were observed surface morphology and cross-section structure by SEM. In this study, using three kinds of resin-cement: Panavia F, RelyX U100, RelyX ARC. The simulated oral environment of 37oC water storage (WS) 1 day and 30 days, then specimens were cut into 1×1×6 mm3 micro-bars for measuring micro-tensile bonding strength. Those treated specimens were observed fracture cross-section structure by SEM. The SEM analysis revealed coating modify surface had effectively effect than acid etching treatment, because coating layer surface had pores that could increase bonding surface area.Measured by micro-tensile bonding strength test, the RelyX U100 group bonding strength was significantly higher after water storage (WS) 1 day and 30 days. In contrast, the VZ1 coating group adhesive closely with three kinds of resin-cement, had the highest bonding strength and stable than conventional Al2O3 sandblasting treatment. The VZ2, VP1 and VP2 coating surface with resin-cement adhesive coating layer had crack formation. The specimens may broken in specimens cutting process. The results show that coating treatment can effectively increase zirconia/resin-cement micro-mechanical bonding strength.
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Mentz, Nicolaas Johannes. "An alginate impression method to detect dental caries in patients with crown and bridge restorations." Thesis, 2008. http://hdl.handle.net/10539/4753.
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Abstract
Introduction: Patients with numerous crowns and bridges are at risk of developing secondary caries on cervical margins of the crowns. This recurrent decay accounts for 60% of the reasons for the replacement of restorations. Detection and treatment of subclinical lesions is important to prevent cavitation. An alginate impression material has been used to locate cariogenic bacteria in established carious lesions. Aims: An alginate impression technique was used to assess the level of Streptococcus mutans and Lactobacilli on the crown margins of the teeth of the restored group and control subjects. Conventional caries activity tests were also used to compare these two groups. Methods: Twenty control group subjects with no crowns and a mean DMFS of 16 and 20 the restored group patients with at least 10 crowns and a mean DMFS of 129 were included in the study. Impressions were taken with a hydrocolloid material mixed with culture broth, incubated and examined for the presence of S. mutans and Lactobacilli on the cervical margins. The results were compared using the two-sample t-test, chi-squared test and a generalized logistic regression analysis. Results: More S. mutans and Lactobacilli were cultured on impressions of the restored group than the control patients (p=0.01 and 0.002). A higher proportion of patients in the restored group had high concentrations of S. mutans and Lactobacilli on their teeth than subjects in the control group (p < 0.001). In the restored group, sixty six per cent of teeth in the posterior and 48% in the anterior segment were crowns. S. mutans and Lactobacilli were found in higher concentrations on the posterior than the anterior teeth of the restored group patients than the control patients (p = 0.016 and 0.047). Furthermore, more Lactobacilli were cultured from the saliva of the restored group than control subjects while the buffering capacity of plaque and the ability of saliva to neutralize acids were lower in the restored group than control group subjects. Conclusion: The impression technique showed that S. mutans and Lactobacilli accumulated in the posterior of the mouth and were associated with crowns indicating these particular sites are at risk.
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Chung-MaoLin and 林仲懋. "Finite Element Analysis and Related Experimental Verification in Three-Unit Posterior Dental Bridge under Loading." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/63471769033381354834.
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碩士國立成功大學
機械工程學系碩博士班
101
The precious metal prices have soared in recent years. To reduce the production costs of dental bridge, we use theoretical and experimental methods to investigate mechanical strength of the bridge, which is hollow designed in metal bracket and filled with ceramics. The shape of bridge is decided from Micro CT. X-ray is unable to penetrate the bridge, so we use dental bridge made of wax which is very similar to real bridge to scan. After scanning, the figure is used to establish the simulation model. We use Finite element method to calculate von-Mises stress and displacement under different loading. Two different loading conditions including distributive loadings exerted on the middle of the bridge and three occlusal face, respectively, are adopted in analysis. Digital image correlation method is used to investigate deformation and piezoelectric material is used to investigate internal stress of the bridge. The force of the two experiments are given by tensile testing machine and the condition is set to be consistent with simulation. Simulation results show that the stress is bigger at the connector of the bridge. The stress loading on three occlusal face is bigger than that on the middle of the bridge. The stress of external ceramic is bigger than internal metal. The more ceramic filled in internal bridge bracket, the bigger stress is induced in two different materials. It shows that the trend of experimental results including the X-directional displacement and the destruction happened at the middle of the bridge are consistent with simulation results. Pre-embedded piezoelectric material properties is also obtained in this study. As the piezoelectric material is embedded in dental bridge and related charge data is measured, the internal von-Mises stress can be obtained accordingly.
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Siao, Wun-jyun, and 蕭文郡. "Research on the dental restoration of a pre-sintered ZrO2 full-ceramic bridge framework using reverse engineering." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/86249906955961510539.
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碩士國立臺灣科技大學
機械工程系
97
The objective of this study is to develop a possible fabrication process of a sintered full-ceramic dental bridge framework by cutting a pre-sintered zirconium oxide (ZrO2) using reverse engineering technology (RET). The mean sintering shrinkage rate of the pre-sintered ZrO2 was 20.482% based on the sintering tests of different designed shapes. A comparison between the bridge frameworks made by a dental technician using RET and that made by the developed method, respectively, has been made. For the bridge framework made by a dental technician using RET, the 3D data points on the resin bridge framework surface and tooth plaster model were digitized by a Cyclone scanning machine, and then used to construct the CAD model of a bridge framework. Regarding the bridge framework made the developed method, the developed software programmed with Borland C++ Builder 6.0 was used to calculate and extrude the offset data points based on the filtered 3D digitized data points with variable section thickness, considering the sintering shrinkage. The CAD model of a bridge framework was then constructed based on the extruded data points. With the help of PowerMill 8.0 CAM software, the machining paths of different bridge frameworks were simulated, and the correspondent NC codes were generated to fabricate the bridge frameworks of pre-sintered ZrO2 on a CNC multi-axis engraving machine. The fabricated bridge frameworks were further sintered to obtain the required strength. Finally, a dental molding material has been used to do the clearance test between the bridge framework and the tooth plaster mold for the bridge frameworks. The clearance for the bridge framework made by a dental technician using RET was about 0.04 mm ~ 0.08 mm, whereas the clearance for the bridge framework made by the developed method was about 0.04 mm ~ 0.11 mm
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Aitken, David Lawrence. "The relationship between occlusal interferences and graphic tracings of mandibular movement a thesis submitted in partial fulfillment ... in restorative dentistry (crown and bridge) ... /." 1987. http://books.google.com/books?id=KK09AAAAMAAJ.
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Shea, Joseph Frederick. "The effect of canine guidance angulation on mandibular movements a thesis submitted in partial fulfillment ... prosthodontics and restorative dentistry, crown and bridge ... /." 1989. http://books.google.com/books?id=dU4_AAAAMAAJ.
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Santos, Maria Catarina Marques dos. "Taxa de sucesso a 5 anos de próteses fixas adesivas : revisão sistemática com meta-análise." Master's thesis, 2021. http://hdl.handle.net/10400.14/35133.
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Introdução: o objetivo desta investigação foi avaliar as taxas de sucesso e/ou
sobrevivência das próteses fixas adesivas, reportadas na literatura científica publicada,
com um tempo médio de observação mínimo de cinco anos e considerando a
localização da prótese, o número de pônticos e retentores, o tipo de cimento utilizado,
o desenho da prótese, assim como o tipo de preparação nos dentes pilares.
Metodologia: revisão sistemática com metaanálise baseada nas normas PRISMA
com a questão de investigação PICOT: “Numa população parcialmente desdentada
(P) a realização de próteses parciais fixas adesivas (I), comparando com as próteses
parciais fixas convencionais (C), apresentam resultados clínicos superiores (O) num
followup mínimo de 5 anos (T)?” Pesquisa efetuada nas bases de dados Pubmed®,
Web of Science® e Cochrane® em formato de texto livre e termos MESH, até maio de
2021. Protocolo registado no PROSPERO (CRD42021236749). Para a metaanálise
foi usado o modelo de efeitos aleatórios, para a taxa de sobrevivência estimada,
percentagem por ano da estimativa de falha e para as complicações existentes. A
heterogeneidade dos estudos foi avaliada pelo teste de inconsistência (I2
) e a
qualidade dos estudos pela escala de Downs & Black.
Resultados: a estratégia de pesquisa definida permitiu incluir no final 11 artigos, com
um total de 687 participantes e 783 próteses parciais fixas adesivas, com um tempo
médio de observação de 8,2 anos, com taxas de sucesso mencionadas em três artigos
e de sobrevivência reportadas em nove artigos. Foram reportadas 142 falhas num
total de 783 próteses, sendo a mais frequente a descimentação. A taxa de falha
estimada (%/ano) foi estimada entre os 0,53%/ano – 5,10%/ano. Os estudos
apresentaram nível de qualidade suficiente. Na metaanálise, as taxas de
sobrevivência mostraram um resultado significativo (p<0,001), uma heterogeneidade
moderada (I
2 = 58,76%).
Conclusão: dentro das limitações do nosso estudo, sobretudo relacionadas com a
heterogeneidade dos estudos e com a qualidade dos mesmos, parece ser possível
concluir que as RBFPDs são uma opção clínica viável para a reabilitação de pacientes
com desdentações unitárias, particularmente aquando da utilização de um retentor e
de prótese confecionadas em zircónia-cerâmica.Introduction: the aim of this investigation was to evaluate the success and/or survival rates of fixed adhesive prostheses reported in the published scientific literature with a minimum avereage observation time of five years and considering the location of the prosthesis, the number of pontics and retainers, the type of cement used, the design of the prosthesis, as well as the type of preparation on the abutment teeth. Methodology: systematic review with metaanalysis registered in PROSPERO (CRD42021236749), based on PRISMA standards with the research question PICOT: "In a partially edentulous population (P) do adhesive fixed partial dentures (I), compared to conventional fixed partial dentures (C), have superior clinical outcomes (O) at a minimum followup of 5 years (T)?" Search conducted in Pubmed®, Web of Science® and Cochrane® databases in freetext format and MESH terms, until May 2021. For the metaanalysis, the random effects model was used, for the estimated survival rate, percentage per year of estimated failure and for existing complications. Study heterogeneity was assessed by the inconsistency test (I2) and study quality by the Downs & Black scale. Results: the defined search strategy included 11 articles, with a total of 687 participants and 783 adhesive fixed partial dentures, with a mean observation time of 8.2 years, with success rates mentioned in three articles and survival rates reported in nine articles. A total of 142 failures were reported for a total of 783 prostheses, the most frequent being debonding. The estimated failure rate (%/year) was estimated to be between 0.53 5.10% per year. The studies were of sufficient quality. In the metaanalysis, the survival rates showed a significant result (p<0.001), with moderate heterogeneity (I2 = 58.76%). Conclusion: within the limitations of our study, mainly related to the heterogeneity of the studies and their quality, it seems possible to conclude that RBFPDs are a viable clinical option for the rehabilitation of patients with single edentation, particularly when using a single retainer and a zirconiaceramic prosthesis.
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Van, Wyk Anna Susanna. "Exploring bridge-grafting as technique te restore growth in girdled Ocotea bullata and Curtisia dentata in the Southern Cape forest area." Diss., 2017. http://hdl.handle.net/10500/23277.
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In South Africa, there is a growing concern regarding the sustainability of bark harvesting due to the reduced availability of medicinal trees in natural areas and the slow growing and slow-reproducing nature of South Africa’s indigenous trees, of which some have specific habitat requirements and a limited distribution. With an estimated 80% of all Africans in South Africa still relying on plant material for their basic healthcare needs, approximately 200 000 traditional healers and an estimated 63 000 commercial harvesters, medicinal plants are being exploited to extinction.
The aim of the study was to determine whether bridge-grafting could be used to restore growth in girdled Ocotea bullata and Curtisia dentata trees as these two medicinal tree species are listed on the South African Red List as ‘endangered’ and ‘near threatened’ due to overexploitation. These trees were also historically used in furniture production and general carpentry, which increased these trees’ vulnerability to extinction. Bridge-grafting is a technique widely described in horticultural literature but has not been used to restore growth in medicinal tree species with extensive harvesting damage. Metabolomics as analytical method is a relatively new science, but it is very useful, accurate and repeatable in obtaining knowledge on the metabolites present in a plant, and for determining the concentrations of metabolites. NMR metabolomics is, however, not sensitive enough to quantify metabolites with very low concentrations such as plant hormones.
The results achieved showed that O. bullata and C. dentata responded differently to girdling and bridge-grafting regarding location of callus initiation, callus development, rate of callus development, basal shoot initiation and development and their sucrose source-sink relationships. NMR metabolomics showed that seasonality was an important factor affecting metabolite responses in both species. NMR metabolomics also showed that after one year, there were no differences in responses above and below the girdle wounds, nor were there differences between the grafted trees and the normal control trees. iv
Although the method of bridge-grafting was successful in restoring the growth of O. bullata and C. dentata with this study, much more research needs to be conducted to prevent endangered girdled medicinal trees from becoming extinct, to maintain tree species diversity, genetic diversity and biodiversity.School of Environmental Sciences
M. Sc. (Nature Conservation)
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Oliveira, Pedro Tavares de. "Estudo do Comportamento Mecânico de Pontes Dentárias." Master's thesis, 2015. http://hdl.handle.net/10316/96819.
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Tese de Mestrado em Engenharia Mecânica, especialidade de Produção e Projeto, apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra.Com este trabalho pretende-se analisar o comportamento mecânico das pontes dentárias direitas, pontes dentárias curvas e a influência do revestimento cerâmico nas pontes dentárias. Destacam-se duas fases principais do trabalho e, consequentemente, a utilização de dois programas informáticos distintos: SOLIDWORKS e ADINA. Numa fase inicial, com recurso ao programa SOLIDWORKS, foi feita a construção e montagem de todos os componentes que constituem o modelo das pontes dentárias. Seguidamente, importou-se o modelo CAD para o programa de método de elementos finitos ADINA, para a análise do comportamento mecânico e estrutural das pontes dentárias, quando sujeitas a diferentes valores de carregamento, e a influência que o revestimento cerâmico tem no que concerne a tensões e deslocamentos. Num total de trinta e sete simulações realizadas no programa ADINA, os resultados obtidos mostram diferentes valores de deslocamentos e tensões, para as mesmas condições de carregamento, nas pontes dentárias direitas e pontes dentárias curvas. O revestimento cerâmico demonstra diferentes influências, no alívio de tensões e diminuição de deslocamentos, entre os dois tipos de pontes dentárias.
The aim of this work is to analyze the mechanical behavior of the straight dental bridges, curved dental bridges and the influence of ceramic veneering on dental bridges. This work is divided in two stages where two different computer programs were used: SOLIDWORKS and ADINA. Initially, using SOLIDWORKS, the construction and assembly of all components that constitute the model of the dental bridges was made. In the second stage the CAD model was imported to the finite element method program ADINA in order to evaluate the mechanical and structural behavior of dental bridges when subjected to different loads and the influence of the ceramic veneering on stresses and displacements. For a total of thirty-seven simulations at ADINA program, the results show different displacements and stresses values for the same loading conditions on the right dental bridges and curved dental bridges. The ceramic veneering show different influences on the stress relief and reduction of displacement between the two types of dental bridges.