Thesis (M.S.)--West Virginia University, 2007. / Title from document title page. Document formatted into pages; contains vii, 40 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 30-34).

published_or_final_version / Endodontics / Master / Master of Dental Surgery

O objetivo no presente trabalho foi avaliar a resistência da união adesiva de uma cerâmica vítrea (IPS e.max Press) fixada sobre o esmalte de dentes bovinos. Empregaram-se dois métodos de cimentação um, com a fotoativação prévia do adesivo; outro, com a fotoativação simultânea do adesivo e do cimento compósito após a fixação do disco cerâmico, que tinha 5mm de diâmetro e 2mm de espessura. Pela combinação de dois sistemas adesivos fotopolimerizáveis (Optibond FL e Single Bond 2), e de dois cimentos (Variolink II e RelyX ARC), um fotopolimerizável e outro de cura dupla associados às duas técnicas de cimentação formaram-se oito condições de cimentação. As amostras foram submetidas a ensaio de cisalhamento pela técnica do fio de aço. Com base nos valores encontrados nas condições estabelecidas, após o respectivo tratamento estatístico, foi possível concluir que: a) a técnica de cimentação com fotopolimerização simultânea do adesivo com o cimento produziu índices de resistência superiores aos obtidos pela técnica de fotopolimerização prévia do adesivo; b) A combinação do adesivo Single Bond 2 com o cimento Variolink II resultou em menores valores de resistência adesiva, diante das outra três combinações de cimentos e adesivos formadas. / The aim of this study was to evaluate the strength of adhesive bonding of a glass-ceramic (IPS e.max Press) fixed on the enamel of bovine teeth. There were used two methods of cementation one in which the adhesive was pre-cured, and another in which the photopolymerization of the adhesive and composite cement was performed simultaneously after the fixing of ceramic disc, which was 5mm in diameter and 2mm thick. Through a combination of two light cured adhesive systems (Single Bond and FL Optibond 2) and two resin cements (Variolink II and RelyX ARC), one light-cured and another dual-cured associated with the two luting techniques eight conditions of cementation were formed. The samples were subjected to shear test technique. Under the established conditions, after statistical treatment of results the following conclusions could be drawn: a) the cementation technique with simultaneous curing of the adhesive with cement produced resistance rates higher than those obtained by the technique of pre-curing the adhesive; b) the combination of adhesive Single Bond 2 with cement Variolink II resulted in lower bond strength, in comparison with the other three combinations of cements and adhesives formed.

Orientador: Maria Amélia Máximo de Araújo / Banca: Ivone de Oliveira Salgado / Banca: Michel Nicolau Youssef / Banca: Sérgio Eduardo de Paiva Gonçalves / Banca: Horácio Faig Leite / Resumo: O objetivo deste estudo foi comparar a efetividade de três cimentos: Cimento Resinoso (3M), Variolink (Vivadent) e Fuji Plus (GC Coorp.); na adesão de discos de porcelana (Fortune,Williams) e de um polímero de vidro (Artglass, Kulzer), à dentina bovina. A superfície vestibular de 120 incisivos bovinos, previamente incluídos em resina acrílica, foi planificada com lixa d'água (granulação 80), e a dentina exposta e regularizada, com lixas de papel de granulação decrescente (240,400 e 600), sob-constante refrigeração de água. Sobre estas superfícies foram cimentados discos, de 5mm de diâmetro x 3mm de altura, de porcelana ou do polímero de vidro, que tinham recebido em sua base um alívio de 40µm, para conter o cimento e padronizar sua espessura. A cimentação foi estática, realizada com o auxílio de um delineador adaptado, e os cimentos empregados de acordo com as indicações dos fabricantes. Os espécimens foram divididos aleatoriamente em grupos de dez. Cada dois grupos receberam o mesmo material e cimento; sendo que destes, um foi testado após 24 h e o outro após seis meses, quanto à resistência ao cisalhamento, em máquina de ensaios universal Instron. Os valores de resistência adesiva obtidos, receberam os testes estatístico ANOVA e de Tukey, 0,05%. As superfícies fraturadas foram observadas em estereomicroscópio (Karl Zeiss). Os resultados demonstraram que o Cimento Resinoso (3M) foi o que apresentou os maiores valores médios de resistência adesiva (14,16MPa); que a adesão da porcelana foi superior; e, que o tempo influenciou, apresentando a avaliação após seis meses, resultados maiores que após 24h. As fraturas foram predominantemente mistas, com algumas fraturas coesivas do cimento e dos materiais também. Pode ser concluído que o Cimento Resinoso e os procedimentos empregados ofereceram uma razoável resistência ao cisalhamento, tanto à porcelana , ... / Abstract: The aim of this study was to investigate the effectiveness of three luting agents : Resin Cement (3M), Variolink (Vivadent) e Fuji Plus (GC Coorp.); in bonding porcelain (Fortune, Williams) and glass polymer (Artglass, Kulzer) discs. To bovine dentin. The facial surfaces of 120 bovine incisors, previously mounted in self-cured resin, were ground flat on wet 80-grit SiC paper. Dentin surfaces exposed had their final finish accomplished by grinding on wet 240, 400 and 600-grit SiC paper. The specimens were randomly assigned to test groups of ten samples. Onto the pretreated dentin surfaces, the discs (5mm diameter,3mm height) were cemented Jhey were seated to a standardized luting thickness of 40µ. Each two groups were cemented with the same luting agent, and one of them shear tested after 24 h and the other after 180 days in an Instron machine. The bond strength data obtained were analysed by ANO VA and the Tukey test, 5%. The mode of failure was classified. The shear test results indicated significant differences among the luting agents: Variolink II (6, 02MPa), Fuji Plus (1 1,20MPa) and with the highest shear bond stregth accomplished when the 3M Resin Cement was the luting agent (14,16MPa). Higher values were also obtained with the porcelain discs and after the 180 days storage period. Mode of failure varied among the groups, with predominance of mixed fractures at the tooth/cement interface, and with a few cohesive porcelain and glass polymer fractures. It can be concluded that the Resin Cement (3M) and the procedure used offer reasonable strength on the porcelain and dentin site / Doutor

Orientador: Maximiliano Piero Neisser / Banca: Alvaro Della Bona / Banca: Marco Antonio Bottino / Resumo: Este estudo avaliou a resistência de união entre um cimento resinoso e uma cerâmica submetida a três tratamentos de superfície. Foram confeccionados cinco blocos cerâmicos (Procera AIICeram), com dimensões de 6mm X 6mm X 15mm. Cada bloco foi seccionado em três porções (6mm X 6mm X 5mm). Os quinze blocos obtidos foram duplicados em resina composta (W3D Master) e a superfície cerâmica foi polida com lixas n° 600, 800 e 1200. Os blocos divididos em três grupos experimentais: Grupo 1 - Jateamento com Al2O3 110µm; Grupo 2 - Sistema Rocatec: Rocatec-Pre + Rocatec-Plus + Rocatec-Sil; Grupo 3 - Sistema CoJet: jateamento com partículas especiais de sílica 30µm + ESPE-SiL Os blocos cerâmicos foram cimentados aos de resina composta com o cimento resinoso Panavia F, conforme as instruções do fabricante, sob carga de 750g por 10min. Os blocos cimentados foram armazenados (água destilada/37°C/7 dias) e seccionados em dois eixos, x e y, com disco diamantado sob refrigeração, obtendo-se corpos-de-prova (n=30) com 0,6 ± 0,1 mm2 de área adesiva. Cada cp foi fixado em um paquímetro adaptado para o teste de microtração e o ensaio realizado (velocidade: 1mm.min-1) em máquina de ensaio universal (EMIC DL-1000). Os dados obtidos foram submetidos à análise de variância e teste de Tukey. Os valores médios de resistência de união (MPa) foram: Grupo 1 - 12,70 ± 2,6; Grupo 2-17,06 ± 3,9; Grupo 3 - 18,52 ± 4,72. G2 e G3 apresentaram resistência de união estatisticamente maior que G1. Não houve diferença estatística significante entre G2 e G3 (p<0,05) / Abstract: This study evaluated the tensile bond strength of a resin cement to a ceramic after to three ceramic surface treatments. Five blocks of Procera AIICeram (6 mm X 6 mm X 15 mm) were fabricated. Each ceramic block was sectioned in 3 portions of 6 mm X 6 mm X 5 mm. The fifteen blocks were duplicata in resin composite (W3D Master); the ceramic surface was polished through 600, 800 and 1200 SiC grids, and the blocks were divided in 3 experimental groups: Group 1- Sandblasting with 110 µm Al203; Group 2- Rocatec System: Racatec-Pre, Plus and -Sil; and Group 3 - CoJet System: Sandblasting with 30µm silica particles + ESPE-Sil. The ceramic blocks were cemented to the resin composite blocks with resin cement (Panavia F), according to manufacturer's instructions, under a load of 750g for 10min. The cemented blocks were stored in 37°C distilled water for 7 days and sectioned in two axes, x and y, with a diamond disk under cooling water in order to obtain samples (sp) with a bonding area of 0,6 ± 0,1 mm2 (n=30). Each sp was attached to an adapted device for the microtensile test. This set was attached to a universal testing machine (EMIC DL-1000) and tested at crosshead speed of 1mm.min-1. The data were statisfically analyzed using ANOVA and Tukey's test. The bond strength mean values (MPa) were: Group 1- 12.70; Group 2- 17.06 and Group 3- 18.52. G2 and G3 showed statistically significant higher bond strength values than G1. There was no statistical difference between G2 and G3 (p<0,05) / Mestre

Pt. 23: An atlas of glass-ionomer cements, bound separately, and called volume 2 / Includes bibliographies and an index in volume 2 / 2 v. (various pagings ; [viii], 128 p.) : / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Summary: Papers listed strictly in chronological order of of publication on glass ionomer cements. Their significance lies largely in the interpretation of the scientific facts and the translation of those facts to the successful clinical application of the material in the oral cavity / Thesis (D. D. Sc.)--University of Adelaide, 1992

Summary Background The cementation of crowns to dental implant abutments is an accepted form of crown retention that requires consideration of the properties of available cements within the applied clinical context. Most current dental cements were developed primarily for use with natural tooth crowns, but must act in a different manner with implant components. Cements are exposed to a number of stressors that may reduce crown retention in vivo, not the least of which is occlusal loading. This study investigated the influence of compressive cyclic loading on the physical retention of cast crown copings cemented to implant abutments. Method Cast crown copings were cemented to Straumann synOcta titanium implant abutments with three different readily used and available cements. Specimens were placed in a humidifier, thermocycled and subjected to one of four quantities of compressive cyclic loading. The uniaxial tensile force required to remove the cast crown copings was then recorded. Data analysis was conducted using two-way ANOVA and paired post tests. Results Statistical analysis arising from post tests following two-way ANOVA testing revealed the mean retention values for crown copings cemented with Panavia-F cement (5.103, 2.681, 3.178, 2.986MPa) were statistically significantly greater than both KetacCem (0.646, 0.701, 1.083, 0.914MPa) and TempBond non–eugenol (0.074, 0.181, 0.190, 0.303MPa) cements at each compressive cyclic loading quantity. KetacCem and TempBond non–eugenol cements produced relatively low mean retention values that were not statistically significantly different at each quantity of compressive cyclic loading. Compressive cyclic loading had a statistically significant effect on Panavia-F specimens alone, but increased loading quantities produced no further statistically significant difference in mean retention. Compressive cyclic loading had no overriding statistically significant effect on the retention of all specimens as a population. Conclusions Within the limitations of the current in vitro conditions employed in this study, the retention of cast crown copings cemented to Straumann synOcta implant abutments with Panavia-F, KetacCem, and TempBond non-eugenol was significantly affected by cement type but not compressive cyclic loading. Panavia-F is the cement of choice for the definitive non-retrievable cementation of cast crown copings to Straumann synOcta implant abutments out of the three cements tested. The implications of these results relate to the choice of cement to provide the desired crown coping retention. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1349966 / Thesis (D.Clin.Dent.) -- University of Adelaide, School of Dentistry, 2008

Thesis (M.S.)--University of Alabama at Birmingham, 2007. / Title from first page of PDF file (viewed Feb. 5, 2008). Includes bibliographical references (p. 71-83).

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).

Made available in DSpace on 2014-08-13T14:50:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-03-12Bitstream added on 2014-08-13T18:01:15Z : No. of bitstreams: 1 000732205_20140909.pdf: 527845 bytes, checksum: a4c9483a6f8f4f270ac1d61032aec827 (MD5) Bitstreams deleted on 2014-10-03T16:24:43Z: 000732205_20140909.pdf,Bitstream added on 2014-10-03T16:27:41Z : No. of bitstreams: 2 000732205_20140909.pdf.txt: 17075 bytes, checksum: 2d10283196b7e27311acd4c2cfff812d (MD5) 000732205.pdf: 890728 bytes, checksum: 73e31941709b20f0f746950e7ee144ad (MD5) Bitstreams deleted on 2014-10-03T16:33:18Z: 000732205.pdf,Bitstream added on 2014-10-03T16:43:31Z : No. of bitstreams: 2 000732205_20140909.pdf.txt: 17075 bytes, checksum: 2d10283196b7e27311acd4c2cfff812d (MD5) 000732205.pdf: 890728 bytes, checksum: 73e31941709b20f0f746950e7ee144ad (MD5) Bitstreams deleted on 2014-10-03T16:48:57Z: 000732205.pdf,Bitstream added on 2014-10-03T16:49:48Z : No. of bitstreams: 1 000732205.pdf: 890728 bytes, checksum: 73e31941709b20f0f746950e7ee144ad (MD5) Bitstreams deleted on 2014-10-27T11:47:13Z: 000732205.pdf,Bitstream added on 2014-10-27T11:48:06Z : No. of bitstreams: 1 000732205.pdf: 890728 bytes, checksum: 73e31941709b20f0f746950e7ee144ad (MD5) / A retenção de pinos pré-fabricados de fibra de vidro utilizados na restauração de dentes com tratamento endodôntico é baseada na sua união às superfícies das paredes do canal radicular por meio dos agentes de fixação resinosos. Os cimentos resinosos auto-adesivos surgiram recentemente com o objetivo de simplificar o procedimento de cimentação, porém seu desempenho clínico ainda é controverso na literatura. Assim, o propósito desse trabalho é avaliar a efetividade de cimentos autoadesivos sob diferentes condições de tratamento da dentina na resistência à extrusão de pinos de fibra de vidro cimentados intrarradicularmente. Foi avaliada a resistência adesiva (push-out) de pinos de fibra de vidro utilizando cimentos resinosos auto-adesivos e, diferentes substâncias para o tratamento dentinário (ácido poliacrílico 11,5%; EDTA 17% e hipoclorito de sódio) previamente ao procedimento de cimentação. Foi avaliado também o tipo de falha entre o pino/cimento/dentina através de microscopia óptica. Foram utilizados 216 unidades experimentais, em forma de discos com aproximadamente 1 mm de espessura, retirados de 72 raízes bovinas restauradas com retenções intra-radiculares. Foi utilizada uma máquina de ensaios universais MTS 810 Material Test System, à velocidade de 0,5 mm/min-1, com célula de carga de 50 Kg, para avaliação da resistência push-out nos diferentes terços de cada corpo-de-prova. Os valores de resistência em kgf, foram convertidos para Mpa. Os dados foram submetidos ao teste kruskall wallis com post-hoc com teste dunn, com nível de significância de 5%. Os resultados mostraram que o pré-tratamento dentinário não influenciou na resistência adesiva, e que o cimento auto-adesivo RelyX U100 parece ser uma opção viável na cimentação de pinos de fibra. / The retention of prefabricated fiberglass posts used in the restoration of endodontically treated teeth is dependent on their bond between the surface of the post and the root canal walls by means of resin cements. The self-adhesive resin cements have recently introduced to simplify the procedure for cementing, but their clinical performance is still controversial in the literature. Thus, the objective of this study is to evaluate the effectiveness of self-adhesive cements under different pretreatment of dentin in the resistance to extrusion of fiberglass posts. Prior to cementing procedure, the pre-treatment of dentin was performed with 11.5% polyacrylic acid, 17% EDTA or sodium hypochlorite. The type of failure between the post/cement/dentin was evaluated by steriomicroscopy. Two hundred and sixteen bovine dentin discs were used. The disks had approximately 1 mm of thickness and they were taken from 72 bovine roots restored with intraradicular retentions. It was employed a universal testing machine MTS 810 Material Test System at a speed of 0.5 mm/min-1 with a load cell of 50 kg to evaluate the push-out resistance in different thirds of each sample . The values of resistance in kgf were converted to Mpa. Data were submitted to Kruskal-Wallis test with Dunn post-hoc test with significance level of 5%. The results showed that pre-treatment had no effect on dentin bond strength, and that the self-adhesive cement RelyX U100 appears to be a viable option in the cementation of fiber post.