Detalhes bibliográficos
| Ano de defesa: |
2011 |
| Autor(a) principal: |
Ely, Caroline |
| Orientador(a): |
Piva, Evandro |
| Banca de defesa: |
Não Informado pela instituição |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal de Pelotas
|
| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Odontologia
|
| Departamento: |
Odontologia
|
| País: |
BR
|
| Palavras-chave em Português: |
|
| Palavras-chave em Inglês: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
https://guaiaca.ufpel.edu.br/handle/123456789/2233
|
Resumo: |
The aim of this project will be to investigate the influence of the addition of light and co-initiators in self-etching primers, in relation to microtensile bond strength (μTBS) and on morphological pattern of hybrid layer of an experimental adhesive system. An experimental self-etching primer will be formulated and on which will be added the initiators of polymerization, resulting in a total of 6 experimental groups: PCONTROL, PCQ, PQTX, PDPI, PBAR and PSUL. A coating adhesive resin compound by Bis-GMA, TEGDMA and HEMA will be formulated. For μTBS test, forty-eight bovine incisors will be randomized and allocate in the six groups. Vestibular enamel will be grounded to expose the superficial coronal dentin, which that will be polished wet to create a standardized smear layer with 600 grit silicon paper. After rinsing, water will be removed with a piece of absorbent paper, leaving the surface visibly dried. The prepared dentin surfaces will be etched with primer and air-dried, after coating adhesive resin will be applied and light activated. The composite resin will be inserted in two increments and will be light activated according to the manufacturer s recommendations. After storage for 24 hours, the specimens will be sectioned with a refrigerated diamond saw at lowspeed. After check normal distribuition and equal variances as assumptions to carry out parametric statistics data obtained on μTBS, will be submitted to two-way ANOVA (factor time and factor initiator of (polymerization) test to verify differences between means (p<0.05). Fractographic analysis will be performed using optical microscopy to describe failure patterns. The morphological pattern of hybrid layer will be examined by scanning electron microscopy (Shimadzu SSX550), after 24 hours and 2 years of storage, using 3 teeth for each experimental group. Teeth will be sectioned with a refrigerated diamond saw, in order to obtain 2 or 3 slices per tooth, with 2mm thickness. Restorative procedure will take place, following the same steps of sample preparation 9 for μTBS test. Then, samples will pass through a sequence of polishing with grit silicon paper and diamond pastes of different granulations. Between each stage of polishing, samples will be placed in one ultrasonic tank to complete removal of waste. After, will undertake the procedures of decalcification with solution of phosphoric acid 50%, deproteinization with sodium hypochlorite solution 2.5%, dehydration with silica at room temperature for 2 hours and coating with gold/palladium. Finally, images of hybrid layer will be observed in SEM, on 3000 and 5000 fold increas |
