Thesis (M.S.)--University of Michigan, 1965.

Thesis (M.S.)--University of Michigan, 1965.

Thesis (M.S.)--University of Michigan, 1955.

Die adhäsive Befestigung von keramischen Inlays erfordert viele mühsa-me und zeitintensive Arbeitsschritte. Zudem werden die Dentin-Bonding-Materialien nicht nach den Herstellerangaben verarbeitet, was unter Um-ständen einen negativen Einfluss auf die Randqualität von keramischen Inlays deren Ränder sich im Dentin befinden können, haben kann. Ziel der Untersuchung: In dieser Studie wurde der Einfluss einer verein-fachten Applikationstechnik auf die Randqualität keramischer Inlays un-tersucht. Material und Methode: MOD-Inlaykavitäten mit Präparationsgrenze im Dentin wurden in 32 humane kariesfreie Prämolaren präpariert. Die Prä-molaren wurden zufällig in vier Gruppen geteilt (n=8). In dem Ver-suchsaufbau war ein Untersuchungsparameter das Inlaymaterial (Empress/Cerec) und der andere die Polymerisation des Dentin-Bonding-Materials vor Insertion des Inlays (P+) und nach Insertion des Inlays (P). Alle Inlays wurden mit einem Dualzement (Variolink II) in Kombination mit einem schmelz- und dentinkonditionierenden Universal-Bonding-Material (Etch & Prime 3.0) eingegliedert. Drei Parameter wurden verwandt, um die Qualität der Versorgung zu bestimmen: 1. Die Passung, gemessen durch die Differenz der Einsenktiefe in die Kavität zwischen der Anprobe und nach dem Zementieren, 2. die Randqualität, die mittels quantitativer Randanalyse im SEM bei einer 200fachen Vergrößerung vor und nach Temperaturlastwechsel (2000 mal zwischen 5° und 55° C) durch Replikas aus Epoxydharz bestimmt wurde und 3. die Randdichtheit, überprüft mit einem Farbstoffpenetrationstest (0,5% wässrige Lösung von basischem Fuchsin). Ergebnisse: Die statistische Analyse (ANOVA) ergab: In allen vier Gruppen waren die Inlays nach der Eingliederung > 5µm tiefer in der Kavität, als bei der Anprobe. Das Ergebnis war für die Gruppe Cerec-Inlays bei denen das Dentin-Bonding vor dem Eingliedern nicht polymerisiert wurde signifikant größer. Die statistische Auswertung der Randanalyse nach dem Friedman und Wilcoxon Test ergab für die zervikalen Bereiche für beide getesteten Kriterien keine statistisch signifikanten Unterschiede (p< 0,01). Die Median-werte für alle Gruppen zeigten 100 Prozent klinisch akzeptable Ränder und keine Randspalten. Der Farbstoffpenetrationstest ergab 71 Prozent dichte Ränder im Schmelz und 38 Prozent dichte Ränder im Dentin. Schlussfolgerung: Bei der Verwendung des universal Bonding-Materials ist es möglich, hohe Randqualitäten mit keramischen Inlays im Schmelz und Dentin selbst mit einer vereinfachten Applikationstechnik, zu erzielen. / The adhesive luting technique for ceramic inlays requires a sequence of multiple steps that are cumbersome and time consuming. Furthermore, modifications of dentin bonding procedures may negatively influence the margin quality of ce-ramic inlays with cervical dentin finishing lines. Purpose: The objective of this study was to test the effect of a new, sim-plified procedure for dentin bonding on the margin quality of ceramic inlays. Materials and Methods: Thirty-two MOD inlay cavities with cervical finish-ing lines in dentin were prepared into premolars. They were randomly di-vided into four groups (n = 8): In the balanced design, one parameter was the inlay material (Empress/Cerec) and the other the polymerization of the dentin bonding agent, before insertion of the inlay (P+) and after in-sertion of the inlay (P-). All inlays were inserted with dual cured cement (Variolink II) in combination with an enamel and dentin conditioning uni-versal bonding agent (Etch & Prime 3.0). Three parameters were used to determine the inlay margin quality: (1) the fit, measured by the difference of the insertion depth into the cavity between try-in and cementation, (2) a quantitative margin analysis in the SEM at a magnification of 200xs, be-fore and after thermocycling (2000 times between 5 and 55 degrees cen-tigrade), using epoxy replicas and (3) dye penetration. Results: Statistical analysis using the ANOVA test showed in all four groups the inlays were >5 µm deeper in the cavities than at the try-in ses-sion. This is explained by the substance loss from the etching. The measured difference for Cerec inlays inserted in cavities, where the bond-ing agent was not polymerized prior to insertion, was significantly larger. Statistical interpretation of the margin analysis of the cervical segment using the Friedman and Wilcoxon Test revealed no statistical differences (p< 0.01) for both criteria tested. The median values for all groups were 100% for clinical acceptable margin and 0% for marginal opening. The dye penetration test resulted in 71% of the enamel margins and 38% of the dentin margins. Conclusion: By using the universal bonding agent, high margin qualities on dentin and enamel are obtained with ceramic inlays even with the sim-plified approach.

De nombreux paramètres interviennent dans la longévité des inlays/onlays réalisés par CFAO tels que l’usinabilité et les propriétés mécaniques des matériaux utilisés, l’adaptation de la restauration ainsi que la qualité de l’interface entre le matériau de restauration en céramique ou en composite et le matériau d’assemblage. Dans un premier temps, au travers d’une revue systématique de la littérature, nous avons sélectionné les méthodes expérimentales et les paramètres permettant d’évaluer l’adaptation de ces restaurations. Il existe des techniques en 2D qui mesurent l’espace dent-matériau à des points de référence présélectionnées et des techniques en 3D (Triple-scan, micro-CT) qui mesurent l'ensemble de l'interface. Cette revue de la littérature nous a permis de mettre en évidence que : le matériau de restauration, le type de préparation, le vieillissement, le collage ou non de la restauration et des paramètres propres à la CFAO ont une influence sur l’adaptation. Dans un deuxième temps, nous avons étudié les propriétés mécaniques de blocs en céramique et en composite et l’adaptation interne in vitro d’inlays usinés à partir de ces mêmes matériaux. L’influence de la nature du matériau de restauration et de son usinabilité sur l’adaptation a été mise en évidence. La troisième partie de notre travail a porté sur la qualité de cette interface par un test de résistance en microtraction et une analyse du type de fracture. Une relation étroite a été démontrée entre la microstructure du bloc testé et le type de traitement de surface utilisé. Ce travail a souligné l’importance d’utiliser plusieurs méthodologies et de les croiser entre elles afin de mieux corréler nos résultats. L’étude du vieillissement de ce joint dento-prothétique constitue un travail à part entière dans laquelle certaines méthodologies utilisées dans cette thèse (profils de rupture, essais mécaniques) peuvent être transposées / Several parameters are involved in the longevity of CAD-CAM inlays/onlays restorations such as the machinability and mechanical properties of the materials used, the adaptation of the restoration and the quality of the resin cement-ceramic or composite interface. Initially, through a systematic review of the literature, the experimental methodologies and parameters to evaluate the adaptation of these restorations were selected. The gap between the tooth and the material, at preselected reference points, is measured by 2D techniques. 3D techniques (Triple-scan, micro-CT) are able to measure the entire interface. This review of the literature allowed us to highlight that: the restorative material, the preparation design, aging, the use of a bonding-system and parameters regarding the CAD-CAM technology have an influence on the marginal adaptation. Afterwards, we assessed the mechanical properties of CAD-CAM ceramic and composite blocks and the internal adaptation in vitro of inlays milled with these same materials. The influence of the nature of the restorative material and its machinability on adaptation was put forward. The third part of our work focused on the quality of this interface using a microtensile bond strength test and a fracture type analysis. A tight association has been shown between the microstructure of the tested blocks and the type of surface treatment applied. This work underlined the importance of using several methodologies and crossing them to better correlate our results. Studying the aging of this dento-prosthetic joint constitutes a whole work in which some approaches used in this thesis (fracture profiles, mechanical tests) can be implemented and transposed

Este trabalho teve como objetivo comparar a resistência à fratura por compressão axial de pré-molares superiores tratados endodonticamente com preparos do tipo MOD, restaurados com “inlays" de cerâmica (IPS-Empress 2) e de cerômero (Targis), cimentadas com três cimentos resinosos de dupla polimerização (Enforce, Variolink II e Panavia F). Selecionaram-se 60 pré-molares superiores hígidos, livres de cáries e trincas, que foram extraídos por razões ortodônticas. Esses dentes foram distribuídos uniformemente, de acordo com suas dimensões vestíbulo-linguais e mésio-distais, em 6 grupos determinados pela combinação dos materiais restauradores e dos cimentos utilizados. Após a cimentação das restaurações e ciclagem térmica, os corpos de prova foram posicionados em uma máquina de ensaio universal e submetidos a uma compressão axial pelo ação de um cilindro de aço com 8mm de diâmetro, numa velocidade de 0,5mm/min, que contactava somente as vertentes triturantes das cúspides vestibular e lingual. Os melhores resultados foram obtidos, em ordem decrescente, com os cimentos Enforce (107,57kgf e 90,21kgf), Variolink II (86,44kgf e 84,07kgf) e Panavia F (82,43kgf e 76,73kgf) para as restaurações com Targis e IPS-Empress 2, respectivamente. Foram encontradas diferenças estatisticamente significantes entre os cimentos Enforce e Panavia F, independente do material restaurador utilizado. Considerando um mesmo agente cimentante, os resultados obtidos com os grupos de dentes restaurados com Targis foram ligeiramente superiores aos restaurados com IPS-Empress 2, sem apresentarem, entretanto, diferenças estatisticamente significantes entre si. / The objective of this research was to compare the fracture resistance upon axial compressive loads of maxillary premolars endodontically treated with MOD preparations restored with ceramic (IPS-Empress 2) and ceromer (Targis) inlays cemented with three dual luting cements (Enforce, Variolink II and Panavia F). Sixty premolars free of caries or fractures, extracted for orthodontic purpose were selected. They were similarly distributed according with their bucco-lingual and mesio-distal dimensions in 6 groups determined by the combination of the restoring materials and luting agents. After cementation and thermocycling procedures, the teeth were fixed in a Universal Test Machine and subjected to an axial compressive load by action of a 8mm wide steel cylinder, at the speed of 0,5mm/min., contacting only the inner aspects of the buccal and lingual cusps. The results were, in decreasing order, as follows: Enforce (107,57kgf e 90,21kgf), Variolink II (86,44kgf e 84,07kgf) and Panavia F (82,43kgf e 76,73kgf), for inlays restored with Targis and IPS-Empress 2, respectively. They were found statistically significance differences between Enforce and Panavia F, independently of the restorative material. Considering the same luting agent, the results obtained with Targis restored groups were slightly superior of those restored with IPS-Empress 2, with no statistically significance difference.

Thesis (M.S.)--University of Alabama at Birmingham, 2007. / Title from first page of PDF file (viewed Feb. 6, 2008). Includes bibliographical references (p. 36-42).

Made available in DSpace on 2014-06-11T19:31:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2005-09-14Bitstream added on 2014-06-13T19:41:15Z : No. of bitstreams: 1 calabrezfilho_s_dr_arafo.pdf: 1543575 bytes, checksum: 53cda3ebc681f14a9c6a7769226d8a18 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O objetivo deste trabalho foi avaliar a infiltração marginal da resina Flow Filtek e do cimento resinoso dual RelyX na fixação de inlays de cerômeros fotoativados com LEDs e Luz Halógena. Foram selecionados 32 dentes íntegros recém-extraídos armazenados em solução de soro fisiológico no freezer, divididos em quatro grupos: Grupo I - aparelho Elipar FreeLight e resina Flow Filtek ; Grupo II - aparelho Ultralux® e Resina Flow Filtek ; Grupo III - aparelho Elipar FreeLight e cimento resinoso RelyX e Grupo IV - aparelho Ultralux® e cimento resinoso RelyX . Foram feitos 64 preparos cavitários com término em esmalte e cemento a 1 mm acima e abaixo da junção amelo-cementária respectivamente. As inlays foram jateadas internamente com óxido de alumínio de 100 æm com 40 Bar de pressão e, posteriormente foi feito o condicionamento das superfícies das inlays com ácido fosfórico a 37% durante 60 segundos, as quais foram lavadas e silanizadas. Após o condicionamento das inlays, foi feito o preparo da superfície dental com ácido fosfórico a 37% durante 15 segundos, as quais foram lavadas, secas com papel absorvente, tendo sido aplicado o adesivo dentinário Single Bond (3m/Espe), e fixadas com seus respectivos cimentos. Posteriormente à fixação, foram fotoativadas pelos aparelhos em íntimo contato com sua superfície por 60 segundos, termociclados com 1.000 ciclos variando-se a temperatura de 5ºC a 55ºC, em seguida imersas em solução de fucsina básica a 5% durante 24 horas, lavadas e seccionadas no centro da restauração para que fosse feita a medida da infiltração em um Software Image Tool calibrado em milímetros, pelo qual foram selecionados os resultados que apresentavam maiores infiltrações em medidas lineares para aplicação dos testes estatísticos.... / The objective of this work was to evaluate the microleakage of the Flow Filtek resin and dual luting RelyX in the fixation of composite resin inlays cured with LEDs and Halogenic Light units. 32 recently extracted complete teeth were selected stored in solution of physiologic serum in freezer, divided in four groups: I Group I- Elipar FreeLight unit and Flow Filtek resin; Group II- Ultralux® unit Flow Filtek resin; Group III- Elipar FreeLight unit and RelyX luting and Group IV- Ultralux® unit RelyX luting. They were made 64 cavitary preparations with end in enamel and dentine with 1 mm above and below enamel-dentin junction respectively, the inlays were sandblasted internally with 100æm/40 pressure Bar and later made the conditioning of the surfaces of the inlays with phosphoric acid to 37% goes 60 seconds, washed and silanizadas. After the conditioning of the inlays they were made the preparation of the dental surface with phosphoric acid to 37% for 15 seconds, washed, dried with absorbent and applied paper the dentinal sticker Single Bond (3m/Espe) and fastened with their respective luting. Later the fixation, these were cured for the units in intimate contact with its surface for 60 seconds. The samples were then thermocycled with 1000 cycles varying the temperature of 5ºC and 55ºC, soon afterwards immersed in solution of basic fucsina to 5% for 24 hours, washed and split up in the center of the restoration so that it was made the measure of the microleakage in a Software Image Tool gaged in millimeters, where they were selected the results that presented larger leakage in lineal measures for application of the statistical tests... (Complete abstract, click electronic address below).

Orientador: Mario Alexandre Coelho Sinhoreti / Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-12T20:03:41Z (GMT). No. of bitstreams: 1 CorreaMedina_AlberthDavid_D.pdf: 2483854 bytes, checksum: 56098c8765561f8bf74fb59fa865130c (MD5) Previous issue date: 2009 / Resumo: As restaurações estéticas indiretas têm sido a opção de escolha no caso de cavidades extensas. No entanto, este tipo de restauração demanda um desenho de preparo muito mais invasivo, podendo levar a sensibilidade pós-operatória, assim como também, certa incompatibilidade entre o cimento resinoso e o adesivo. Na tentativa de solucionar estas limitações tem sido sugerida uma técnica chamada de "Resin Coating Technique" ou Técnica de Selamento Dentinário (TSD), que consiste em proteger a superfície exposta após o preparo com um sistema adesivo e sobre este é aplicado ou nao um "liner" (monômero hidrófobo ou resina composta de baixa viscosidade). A utilização desta técnica vem oferecendo bons resultados, embora, pouco se sabe referente à combinação apropriada entre adesivo e "liner" e a interação desta técnica com os diferentes tipos de cimento resinoso. Portanto, este estudo teve como objetivos avaliar a influencia de diferentes combinações da TSD, na adaptação marginal, resistência de união, nanoinfiltração de restaurações indiretas, e após de ter identificado a combinação mais apropriada para a TSD, foi avaliada a interação desta com os cimentos resinosos através dos testes de adaptação marginal e resistência de união. Para estes estudos foram avaliados as combinações de sistemas adesivos que utilizam o condicionamento acido prévio de 2 e 3 passos e adesivos autocondicionantes de 1 e 2 passos seguido da aplicação ou não aplicaçao de uma camada de "liner" (monômero hidrófobo/resina composta de baixa viscosidade). Nas combinações avaliadas os grupos que obtiveram menores resultados tanto para adaptação marginal e resistência de união foram as combinações que não utilizaram liner. O grupo adesivo autocondicionante de 2 passos/resina composta de baixa viscosidade apresentou maior resistência de união e menor grau de nanoinfiltração. No entanto, todas as combinações avaliadas de TSD não conseguiram evitar a desadaptação marginal e nanoinfiltração das restaurações. Referente ao comportamento desta combinação com diferentes tipos de cimento, foi avaliada a adaptação marginal e resistência de união de diferentes cimentos resinosos (autocondicionante, autoadesivo e de ativação química) obtendo como resultados que o grupo que obteve melhores valores de resistência de união foi o grupo que utilizou cimento autocondicionante, embora não houve diferença entre os cimentos no que se refere à adaptação marginal. Por tanto, pelos achados destes estudos conclui-se que para obter melhor adaptação marginal utilizando a TSD é necessária a aplicação de um liner. A combinação de sistema autocondicionante 2 passos/resina de baixa viscosidade obteve maiores valores de resistência de união e menor padrão de nanoinfiltração. O cimento resinoso autocondicionante mostra-se ser o mais compatível com a TSD. / Abstract: Indirect esthetic restorations have been considered an excellent restorative alternative for extensive cavities. However, this type of restoration demands a more invasive preparation, which may cause post-operative sensibility and incompatibility between resin cement and adhesive system. In attempt to minimize these limitations the Resin Coating Technique (RCT) has been proposed. This technique consists in protecting the exposed dentin after the cavity preparation with an adhesive, followed by the application or not application of a liner (hydrophobic monomer or low viscosity resin). The effectiveness of this technique was reported in several studies, however, little is known about the appropriate combination between adhesive and liner and the behavior of this RCT with different resin cements. Therefore, the aims of this study were: evaluate the influence of the combination of different materials used in the RCT on the marginal adaptation, bond strength and nanoleakage of indirect restorations and after identify the most appropriate combination for the RCT, was evaluated the behavior of this RCT with different resin cements using the marginal adaptation and bond strength tests. For these studies were evaluated etch and rise adhesive system (2 and 3 steps) and self-etch adhesives (2 and 1step) followed of the application of liner layer (hydrophobic monomer or low viscosity resin). In all evaluated combinations, the groups that showed low results in marginal adaptation and bond strength were the combinations that not used a liner. The group self etch 2 steps/flow composite resin, showed high bond strength and low nanoleakage. However, in all the restorations showed marginal disadaptation and nanoleakage, independent of the material combinations used for the resin coating. In the study about the interaction of the RCT with the type of resin cement (Self-etching, Self-Adhesive and Chemical Cure) evaluating marginal adaptation and bond strength, was obtained the highest bond strength for the Self-etch group, however, there is no difference between groups for marginal adaptation. So, within the limits of this study, it can be concluded that the use of a liner is necessary for a better marginal adaptation using the RCT. The combination of self etch 2steps/flow composite resin showed high bond strength and low nanoleakage. The self etch resin cement revealed high bond strength showing more compatibility with the RCT. / Doutorado / Materiais Dentarios / Doutor em Materiais Dentários

Este trabalho teve como objetivo comparar a resistência à fratura por compressão axial de pré-molares superiores tratados endodonticamente com preparos do tipo MOD, restaurados com “inlays” de cerâmica (IPS-Empress 2) e de cerômero (Targis), cimentadas com três cimentos resinosos de dupla polimerização (Enforce, Variolink II e Panavia F). Selecionaram-se 60 pré-molares superiores hígidos, livres de cáries e trincas, que foram extraídos por razões ortodônticas. Esses dentes foram distribuídos uniformemente, de acordo com suas dimensões vestíbulo-linguais e mésio-distais, em 6 grupos determinados pela combinação dos materiais restauradores e dos cimentos utilizados. Após a cimentação das restaurações e ciclagem térmica, os corpos de prova foram posicionados em uma máquina de ensaio universal e submetidos a uma compressão axial pelo ação de um cilindro de aço com 8mm de diâmetro, numa velocidade de 0,5mm/min, que contactava somente as vertentes triturantes das cúspides vestibular e lingual. Os melhores resultados foram obtidos, em ordem decrescente, com os cimentos Enforce (107,57kgf e 90,21kgf), Variolink II (86,44kgf e 84,07kgf) e Panavia F (82,43kgf e 76,73kgf) para as restaurações com Targis e IPS-Empress 2, respectivamente. Foram encontradas diferenças estatisticamente significantes entre os cimentos Enforce e Panavia F, independente do material restaurador utilizado. Considerando um mesmo agente cimentante, os resultados obtidos com os grupos de dentes restaurados com Targis foram ligeiramente superiores aos restaurados com IPS-Empress 2, sem apresentarem, entretanto, diferenças estatisticamente significantes entre si. / The objective of this research was to compare the fracture resistance upon axial compressive loads of maxillary premolars endodontically treated with MOD preparations restored with ceramic (IPS-Empress 2) and ceromer (Targis) inlays cemented with three dual luting cements (Enforce, Variolink II and Panavia F). Sixty premolars free of caries or fractures, extracted for orthodontic purpose were selected. They were similarly distributed according with their bucco-lingual and mesio-distal dimensions in 6 groups determined by the combination of the restoring materials and luting agents. After cementation and thermocycling procedures, the teeth were fixed in a Universal Test Machine and subjected to an axial compressive load by action of a 8mm wide steel cylinder, at the speed of 0,5mm/min., contacting only the inner aspects of the buccal and lingual cusps. The results were, in decreasing order, as follows: Enforce (107,57kgf e 90,21kgf), Variolink II (86,44kgf e 84,07kgf) and Panavia F (82,43kgf e 76,73kgf), for inlays restored with Targis and IPS-Empress 2, respectively. They were found statistically significance differences between Enforce and Panavia F, independently of the restorative material. Considering the same luting agent, the results obtained with Targis restored groups were slightly superior of those restored with IPS-Empress 2, with no statistically significance difference.