Orientadores: Marcelo Giannini, Simonides Consani / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-04T03:24:00Z (GMT). No. of bitstreams: 1
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Previous issue date: 2005 / Resumo: O objetivo deste estudo foi avaliar o efeito de técnicas de preparo cavitário nos procedimentos adesivos com sistemas autocondicionantes. Foram analisadas as resistências à tração da união após os tratamentos, assim como, em
microscopia eletrônica de varredura (MEV), as características morfológicas das estruturas formadas na região da união dentina-compósito; a morfologia da superfície produzida pelos tratamentos utilizados para preparar a dentina e o
padrão de fratura dos espécimes testados no ensaio de microtração. Foram utilizados 208 terceiros molares humanos, que tiveram a superfície oclusal removida para a exposição de dentina de profundidade superficial e foram divididos aleatoriamente em 32 grupos experimentais. As tecnologias de preparo cavitário foram: ausência de smear layer, abrasionamento com lixas de SiC 600, ponta diamantada (100µm),broca carboneto de tungstênio (10 lâminas), aplicação
de jato de óxido de alumínio 271µm,aplicação de laser Er:YAG, ponta diamantada CVD em ultra-som e Carisolv®.Após o tratamento superficial foi aplicado um dos sistemas adesivos de acordo com as instruções dos fabricantes (Tyrian, Clearfil
SE Bond, Unifil Bond e Single Bond), em seguida restaurados com o compósito Clearfil AP-X. Os dentes foram armazenados em água destilada a 3rC durante 24 horas. Após esse período, os dentes foram seccionados perpedicularmente a
interface de união, nos sentidos mésio-distal e vestíbulo-lingual, com a finalidade de se obter palitos com área de secção transversal de 0,7mm2. Os espécimes foram testados com o ensaio de microtração numa velocidade de 0,5mm/min até a
ruptura. Os resultados foram analisados com ANOVA dois-critérios e teste Tukey. Foi identificada uma interação entre os tratamentos e os sistemas adesivos (p<0,00003).O tratamento com o laser de Er:YAG na condição do experimento e
a ponta diamantada CVD em ultra-som apresentaram os piores resultados para todos os sistemas. O Carisolv® apresentou valores de resistência de união intermediários, porém os adesivos autocondicionantes mostraram resultados
inferiores ao Single Bond. A ponta diamantada, a broca carboneto de tungstênio e a lixa de SiC 600 mostraram os resultados semelhantes. A abrasão a ar proporcionou maiores valores de resistência de união para o Clearfil SE Bond que
apresentou resultado superior ao Tyrian. Os sistemas Clearfil SE Bond e Single Bond foram superiores, obtendo os maiores valores na ausência de smear layer, no entanto, o Unifil Bond foi semelhante ao Single Bond. As análises em MEV
revelaram variações na formação da camada híbrida e uma predominância do padrão de fratura com falha adesiva entre o sistema de união e a dentina, e parcialmente coesiva no sistema de união. Foi observado que existe uma forte
dependência entre as tecnologias utilizadas para a realização dos preparos cavitários e os sistemas de união, porém a técnica do condicionamento com ácido fosfórico pode reduzir o efeito das tecnologias sobre a resistência de união, exceto
pela aplicação do laser de Er:YAG e da ponta diamantada CVD em ultra-som / Abstract: The aim of this study was to evaluate the effect of alternative cavity preparation techniques on the adhesive procedures with self-etching adhesive systems. Microtensile bond strength tests (µTBS), as well as, analysis under
scanning electron microscope (SEM) of the morphological characteristics of the bonded structures, treated dentin surfaces and the failure mode of the tested specimens were performed. 208 third human molars had their oclusal surface
flattened in order to expose superficial dentin. Teeth were randomly assigned to 32 experimental groups. Cavity preparation techniques used in this study were: smear layer free surface, 600-grit SiC paper, diamond bur (100µm,)carbide bur (10
blades), air abrasion, Er:YAG laser, CVD diamond bur - sonoabrasion and Carisolv® gel. Following each surface treatment, adhesive systems (Tyrian, Clearfil SE Bond, Unifil Bond and Single Bond) were applied according to manufacturer's
instructions and 6mm high blocks were incrementally built up with Clearfil AP-X (Kuraray) composite resin. The specimens were stored for 24 hours at 37°C in distilled water and were serially sectioned in both mesio-distal and buccal-lingual
directions transversally to the bonded interface to obtain an array of bonded beams with a cross-sectional area of 0.7mm2. Beams were tested in tension (0.5mm/min - Instron 4411) and results were analyzed with two-way ANOVA and Tukey's test. It
was found an interaction between adhesive systems and surface treatments (p<0.00003). Sonoabrasion and laser treatment yielded the lowest values for the tested adhesive systems; Carisolv® gel showed intermediate bond strength, however, self-etching adhesive systems were worse than Single Bond. Diamond bur, carbide bur and 600-grit SiC paper had similar results. Air-abrasion produced improved results for adhesion with Clearfil SE Bond that was significantly better
than Tyrian. Clearfil SE Bond and Single Bond were superior, obtaining the highest values of The aim of this study was to evaluate the effect of alternative cavity preparation techniques on the adhesive procedures with self-etching adhesive
systems. Microtensile bond strength tests (µTBS), as well as, analysis under scanning electron microscope (SEM) of the morphological characteristics of the bonded structures, treated dentin surfaces and the failure mode of the tested
specimens were performed. 208 third human molars had their oclusal surface flattened in order to expose superficial dentin. Teeth were randomly assigned to 32 experimental groups. Cavity preparation techniques used in this study were: smear
layer free surface, 600-grit SiC paper, diamond bur (100µm,)carbide bur (10 blades), air abrasion, Er:YAG laser, CVD diamond bur - sonoabrasion and Carisolv®gel. Following each surface treatment, adhesive systems (Tyrian, Clearfil
SE Bond, Unifil Bond and Single Bond) were applied according to manufacturer's instructions and 6mm high blocks were incrementally built up with Clearfil AP-X (Kuraray) composite resin. The specimens were stored for 24 hours at 37°C in
distilled water and were serially sectioned in both mesio-distal and buccal-lingual directions transversally to the bonded interface to obtain an array of bonded beams with a cross-sectional area of O.7mm2. Beams were tested in tension (0.5mm/min - Instron 4411) and results were analyzed with two-way ANOVA and Tukey's test. It was found an interaction between adhesive systems and surface treatments (p<0.00003). Sonoabrasion and laser treatment yielded the lowest values for the tested adhesive systems; Carisolv® gel showed intermediate bond strength, however, self-etching adhesive systems were worse than Single Bond. Diamond bur, carbide bur and 600-grit SiC paper had similar results. Air-abrasion produced
improved results for adhesion with Clearfil SE Bond that was significantly better than Tyrian. Clearfil SE Bond and Single Bond were superior, obtaining the highest values of µTBS for the smear layer free surface, although in the comparison
among the adhesive systems Unifil Bond and Single Bond were similar. SEM analysis revealed some variations in the hybrid layer formation and the predominance of an adhesive failure between adhesive system and dentin, and partially cohesive in the adhesive system. It was also observed that there is a strong relationship between cavity preparation techniques and adhesive systems, however, the total-etch technique seems to levei the effect over the µTBS, except for the Er:YAG laser treatment and sonoabrasion / Mestrado / Dentística / Mestre em Clínica Odontológica
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unicamp.br:REPOSIP/287832 |
| Date | 25 February 2005 |
| Creators | Oliveira, Marcelo Tavares de |
| Contributors | UNIVERSIDADE ESTADUAL DE CAMPINAS, Consani, Simonides, 1939-, Giannini, Marcelo, 1969-, Eduardo, Carlos de Paula, Sinhoreti, Mário Alexandre Coelho |
| Publisher | [s.n.], Universidade Estadual de Campinas. Faculdade de Odontologia de Piracicaba |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | 116p. : il., application/pdf |
| Source | reponame:Repositório Institucional da Unicamp, instname:Universidade Estadual de Campinas, instacron:UNICAMP |
| Rights | info:eu-repo/semantics/openAccess |
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