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Diferentes estratégias adesivas para o sistema adesivo optibond FL : um estudo de microinfiltração
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Abstract(s)
Objetivos: Avaliar a microinfiltração das interfaces adesivas obtidas através de diferentes
estratégias adesivas no esmalte e na dentina.
Materiais e Métodos: 40 dentes humanos hígidos foram divididos aleatoriamente em
quatro grupos e em todos eles foram efetuadas preparações cavitárias classe V por
vestibular e lingual/palatino. Posteriormente foram restaurados com resina composta
microhíbrida (Filtek Z250) com recurso a quatro estratégias adesivas diferentes. Grupo
A: Optibond FL - etch-and-rinse de três passos (n=10); Grupo B: Optibond FL – sem
aplicação prévia do ácido ortofosfórico (n=10); Grupo C: Clearfil SE Bond 2 - self-etch
de dois passos (n=10); Grupo D: Clearfil SE Bond 2 - selective enamel etching (n=10).
Posteriormente, foram mergulhados em água destilada onde permaneceram durante 24
horas na estufa a 37ºC. Aplicou-se verniz com uma margem de 1 mm em torno das
restaurações. De seguida, foram submersas numa solução de fucsina básica 0,5% durante três horas. Por fim, com recurso à lupa estereoscópica foi avaliado em cada grupo o nível de microinfiltração numa escala de 0 a 3. A análise estatística descritiva e inferencial foi efetuada com recurso ao teste de Mann-Whitney com um nível de significância de 5%.
Resultados: Nos grupos A e D não se registou qualquer microinfiltração quer na parede
oclusal quer na parede cervical; nos grupos B e C registaram-se três microinfiltrações de
grau 1 em cada grupo, na parede oclusal, enquanto na parede cervical não ocorreu
qualquer microinfiltração. O resultado da comparação revelou que não existem diferenças significativas do grau de microinfiltração marginal entre os grupos B e C (𝑝 = 1,00 > 0,05).
Conclusão: A eficácia das estratégias utilizadas é similar. Sem envelhecimento não faz
sentido aferir a capacidade do monómero acídico GPDM em substituir o papel do ácido
no esmalte. Na dentina este monómero torna o ácido é dispensável.
Purpose: Evaluate the microleakage of adhesive interfaces obtained using different adhesive strategies on enamel and dentin. Materials and Methods: 40 healthy human teeth were randomly divided into four groups; in all of them class V cavities were prepared on buccal and lingual surfaces. After that, they were restored with microhybrid composite resin (Filtek Z250) using four different adhesive strategies. Group A: Optibond FL - three step etch-and-rinse (n=10); Group B: Optibond FL - without prior application of orthophosphoric acid (n=10); Group C: Clearfil SE Bond 2 - two steps self-etch (n=10); Group D: Clearfil SE Bond 2 - selective enamel etching (n=10). Then the teeth were stored in distilled water for 24 hours in the oven at 37ºC. Nail varnish was applied to all samples with a margin of 1 mm around the restorations. Subsequently, they were immersed in a basic fuchsin solution 0,5% for three hours. Finally, using the stereoscopic magnifier, the level of microleakage was scoreed on a 0 to 3 ordinal sacale. Descriptive and inferential statistical analysis was performed using the Mann-Whitney test under a significance level of 5%. Results: In groups A and D, there was no microleakage in both the occlusal and cervical walls; in groups B and C, three grade 1 microleakage were recorded in each group on the occlusal wall, while no microleakage occurred in the cervical wall. The result of comparison between groups B and C revealed that there are no significant differences in the degree of marginal microleakage (p = 1,00 > 0,05). Conclusions: The effectiveness of the strategies used is similar. Without aging it does not make sense to evaluate the ability of the acidic monomer GPDM to replace the role of the acid in the enamel. In dentin, this monomer allows to dispense the acid.
Purpose: Evaluate the microleakage of adhesive interfaces obtained using different adhesive strategies on enamel and dentin. Materials and Methods: 40 healthy human teeth were randomly divided into four groups; in all of them class V cavities were prepared on buccal and lingual surfaces. After that, they were restored with microhybrid composite resin (Filtek Z250) using four different adhesive strategies. Group A: Optibond FL - three step etch-and-rinse (n=10); Group B: Optibond FL - without prior application of orthophosphoric acid (n=10); Group C: Clearfil SE Bond 2 - two steps self-etch (n=10); Group D: Clearfil SE Bond 2 - selective enamel etching (n=10). Then the teeth were stored in distilled water for 24 hours in the oven at 37ºC. Nail varnish was applied to all samples with a margin of 1 mm around the restorations. Subsequently, they were immersed in a basic fuchsin solution 0,5% for three hours. Finally, using the stereoscopic magnifier, the level of microleakage was scoreed on a 0 to 3 ordinal sacale. Descriptive and inferential statistical analysis was performed using the Mann-Whitney test under a significance level of 5%. Results: In groups A and D, there was no microleakage in both the occlusal and cervical walls; in groups B and C, three grade 1 microleakage were recorded in each group on the occlusal wall, while no microleakage occurred in the cervical wall. The result of comparison between groups B and C revealed that there are no significant differences in the degree of marginal microleakage (p = 1,00 > 0,05). Conclusions: The effectiveness of the strategies used is similar. Without aging it does not make sense to evaluate the ability of the acidic monomer GPDM to replace the role of the acid in the enamel. In dentin, this monomer allows to dispense the acid.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Microinfiltração Etch-and-rinse Self-etch Esmalte Dentina GPDM