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Estudo do micro infiltração marginal de um adesivo universal experimental e de adesivos universais comerciais devido às alterações de pressão nos aviadores
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Abstract(s)
Objetivos: avaliar a microinfiltração de 2 sistemas adesivos universais comerciais e de um adesivo universal experimental em condições de pressão hipobárica
Matérias e Métodos: Um total de 45 molares saudáveis foram utilizados para o teste de microinfiltração. Após desinfeção com uma solução de Cloramina T a 1% e armazenamento a 4°C, os dentes foram cortados em dois fragmentos, obtendo-se 90 espécimes. Estes foram divididos em seis grupos (n=15), três grupos de controlo e três grupos experimentais.
Foram criadas duas cavidades de Classe II em cada dente, uma mesial e outra distal, e restauradas com o sistema adesivo atribuído a cada grupo. Os grupos experimentais foram submetidos a uma câmara de pressão para simular alterações de pressão, com 1000 ciclos de 3 minutos e variações de pressão de 1 atm a 0,5 atm. Os grupos de controlo foram mantidos em água destilada a 37°C.
Para o estudo da microinfiltração, todas as superfícies, exceto a restauração e uma margem de 1 mm à sua volta, foram revestidas com verniz. Os espécimes foram imersos numa solução de fucsina a 0,5% durante 24 horas a 37°C e depois lavados. Finalmente, os espécimes foram seccionados e observados sob uma lupa estereoscópica de 20x para quantificar a penetração do corante nas margens gengivais, numa escala de 0 a 3.
Resultados: As variações de pressão não parecem influenciar o desempenho dos adesivos em termos de microinfiltração. No entanto, foram observadas diferenças notáveis consoante o tipo de adesivo, com o EM2 a apresentar resultados favoráveis em comparação com os outros adesivos testados. Este facto sugere que o EM2 pode ser uma escolha interessante em determinadas situações em que a microinfiltração tem de ser minimizada.
Conclusões: Os resultados sugerem igualmente que o adesivo EM2 pode ser preferido em situações em que a minimização do micro infiltração é crucial, independentemente das condições de pressão aplicáveis.
Aims: To evaluate the microleakage of 2 commercial universal adhesive systems and an experimental universal adhesive under hypobaric pressure conditions. Materials and Methods: A total of 45 healthy molars were used for the microleakage test. After disinfection with 1% chloramine T solution and storage at 4°C, the teeth were cut into two fragments, resulting in 90 specimens. These were divided into six groups (n=15), three control groups and three experimental groups. Two Class II cavities were created in each tooth, one mesial and one distal, and restored with the adhesive system assigned to each group. The experimental groups were placed in a pressure chamber to simulate pressure changes, with 1000 cycles of 3-minute and pressure variations from 1 atm to 0.5 atm. The control groups were kept in distilled water at 37°C. For the microleakage study, all surfaces except the restoration and a 1 mm margin around the restoration were coated with varnish. The specimens were immersed in 0.5% fuchsin solution for 24 hours at 37°C and then washed. Finally, the specimens were sectioned and examined under a 20x stereoscopic loupe to quantify the penetration of the dye into the gingival margins on a scale of 0 to 3. Results: Pressure variations did not appear to affect the performance of the adhesives in terms of microleakage. However, significant differences were observed depending on the type of adhesive, with EM2 showing favourable results compared to the other adhesives tested. This suggests that EM2 may be an interesting choice in certain situations where microleakage needs to be minimised. Conclusions: The results also suggest that EM2 adhesive may be preferred in situations where minimising microleakage is critical, regardless of the applicable pressure conditions.
Aims: To evaluate the microleakage of 2 commercial universal adhesive systems and an experimental universal adhesive under hypobaric pressure conditions. Materials and Methods: A total of 45 healthy molars were used for the microleakage test. After disinfection with 1% chloramine T solution and storage at 4°C, the teeth were cut into two fragments, resulting in 90 specimens. These were divided into six groups (n=15), three control groups and three experimental groups. Two Class II cavities were created in each tooth, one mesial and one distal, and restored with the adhesive system assigned to each group. The experimental groups were placed in a pressure chamber to simulate pressure changes, with 1000 cycles of 3-minute and pressure variations from 1 atm to 0.5 atm. The control groups were kept in distilled water at 37°C. For the microleakage study, all surfaces except the restoration and a 1 mm margin around the restoration were coated with varnish. The specimens were immersed in 0.5% fuchsin solution for 24 hours at 37°C and then washed. Finally, the specimens were sectioned and examined under a 20x stereoscopic loupe to quantify the penetration of the dye into the gingival margins on a scale of 0 to 3. Results: Pressure variations did not appear to affect the performance of the adhesives in terms of microleakage. However, significant differences were observed depending on the type of adhesive, with EM2 showing favourable results compared to the other adhesives tested. This suggests that EM2 may be an interesting choice in certain situations where microleakage needs to be minimised. Conclusions: The results also suggest that EM2 adhesive may be preferred in situations where minimising microleakage is critical, regardless of the applicable pressure conditions.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Micro infiltração Hipobárica Odontocrexis