| Ano de defesa: |
2012 |
| Autor(a) principal: |
Hass, Viviane
 |
| Orientador(a): |
Reis, Alessandra
|
| Banca de defesa: |
Arrais, Cesar Augusto Galvão
,
Calixto, Abraham Lincoln
|
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
UNIVERSIDADE ESTADUAL DE PONTA GROSSA
|
| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Odontologia
|
| Departamento: |
Clinica Integrada, Dentística Restauradora e Periodontia
|
| País: |
BR
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://tede2.uepg.br/jspui/handle/prefix/1789
|
| Resumo: |
This study evaluated the effect of prolonged exposure times on immediate (IM) and 6-month (6M) adhesive properties: degree of conversion within hybrid layer (DC), silver nitrate uptake (SNU) and resin-dentin bond strenght (μTBS) for three one-step self-etch adhesive systems (Adper Easy Bond [EB], Clearfil S3 Bond [CS3] and Go [GO]).Ninety caries-free extracted molars were included in this study being 45 for μTBS and SNU (n=5) and 45 for DC (n=5). The dentin surfaces were bonded according to the manufacturer’s instructions, but they were light-cured for 10, 20, and 40 s at 600mW/cm2. Bonded teeth for the μTBS test were sectioned in order to obtain stick-like specimens (0.8mm2) and tested under tensile stress 0.5mm/min). Two bonded sticks from each tooth were analyzed by scanning electron microscopy for SNU. The DC within the hybrid layer were evaluated with micro-Raman spectroscopy. All tests were performed IM and at 6M. Data were analyzed by a threeway repeated measures ANOVA and Tukey´s test (alpha=0.05).The prolonged exposure times increased the DC () [10s- 67.3±19.5; 20s- 84.6 ± 12.3 e 40s- 82.9 ±13.1] for all adhesives and decreased the SNU ()[10s- 24.8 ± 13.2; 20s- 13.3 ± 7.5 e 40s- 13.5 ± 9.3] significantly for all adhesives; however significant improvements in the μTBS (MPa) [10s- 17.3 ± 3.7; 20s- 31.9 ± 4.9 e 40s- 25.0 ± 3.7] and stable bond strengths after water storage [IM- 25.2 ± 7.3; 6M- 24.2 ± 7.2] were observed only for CS3. EB [IM- 35.9 ± 4.7; 6M- 28.0 ± 6.0] and GO [IM- 25.6 ± 5.0; 6M- 14,3 ± 3,7] decreased the μTBS after 6 months. The prolonged exposure times improved the DC within the hybrid layer and reduced the SNU for all adhesives, however this did not prevent the degradation of the adhesive interface. |
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