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Avaliação do Selamento Marginal Promovido por Sistemas Adesivos Aplicados em Esmalte e Dentina

DOI: http://dx.doi.org/10.18256/2238-510X/j.oralinvestigations.v3n1p4-9

https://seer.imed.edu.br/index.php/JOI/index 

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Amanda Aguiar1, Gabriela F. Seixas1, Tania C. Simões1, Ana B. F. Fernandes1, Priscilla do M. R. Busato2 & Sandra K. Moura1

  

Resumo: Objetivo: Avaliar o selamento marginal promovido por dois diferentes sistemas adesivos em esmalte e dentina através de microinfiltração. Método: Foram utilizados 20 terceiros molares humanos hígidos. Os sistemas adesivos Adper Single Bond 2 (convencional) e Adper SE Plus (autocondicionante) foram aplicados em cavidades Classe V, nas faces vestibular e lingual, seguindo-se restauração com resina composta Filtek Z350 na técnica incremental e fotoativação com aparelho de lâmpada halógena (VIP, Bisco, 550mW/cm²). Os dentes restaurados permaneceram armazenados em água destilada (24h/37°C), foi feito o acabamento, termociclagem (500 ciclos, 5°/55°C, 30 segundos), impermeabilização dos ápices dentários com resina acrílica e o restante do dente com três camadas de esmalte cosmético, exceto 1 milímetro ao redor da cavidade. Seguiram-se a imersão em solução aquosa de nitrato de prata a 50% (2 h em ambiente escuro), lavagem, imersão em solução reveladora Kodak (8 h sob luz fluorescente) e lavagem. As restaurações foram seccionadas pelo centro, no sentido V-L, obtendo-se duas fatias. A microinfiltração foi avaliada por um examinador treinado, em software UTHSCSA Image Tool for Windows 3.0, com dois métodos: qualitativo (escala visual: 0- sem infiltração; 1- infiltração em esmalte; 2- em dentina nas paredes axial e gengival; 3 – idem 3 e em direção à polpa e quantitativo (porcentagem de infiltração de nitrato de prata). Os dados foram submetidos ao teste t de Student (alfa=5%). Resultados: Não foi observada diferença entre os materiais na porcentagem de infiltração de nitrato de prata (p=0,595), nem na avaliação por escala (p=0,408). Houve infiltração em dentina nos dois grupos. Conclusão:  os sistemas adesivos testados apresentaram comportamento semelhante.

Palavras-chave: Esmalte. Dentina. Adesivos dentinários. Infiltração marginal.

 

Abstract: Objective: To evaluate the marginal sealing ability of two different adhesive systems to enamel and dentin by microleakage test. Method: Forty Class V cavities were prepared at the vestibular and lingual surfaces of twenty third molars. Adper Single Bond 2 and Adper SE Plus adhesive systems were applied. They were light cured with a halogen lamp (550mW/cm²). The cavities were restored incrementally with Filtek Z350 composite resin and the teeth stored in distilled water (37ºC/24h). After thermocycling (500 cicles, 5/55ºC, 30s), the teeth apexes were covered with acrylic resin and the teeth with three layers of nail varnish until 1mm from the restoration margins. The restored teeth were immersed in a 50% silver nitrate solution during 2h under dark room, washed in water, immersed into a developed solution Kodak (8h), washed and longitudinally sectioned to obtain two slices. Microleakage was evaluated by a single calibrated operator using UTHSCSA Image Tool for Windows 3.0 software and two methods: qualitative (visual scale: 0- no leakage; 1- leakage in enamel; 2- leakage in dentin; 3- leakage in gingival and axial walls and towards the pulp) and quantitative (percentage of silver nitrate leakage). The data were treated using t-Student test (alfa=5%). Results: There was no difference between the adhesive systems at the percentage of silver nitrate leakage (p=0,595) and the scale analysis (p=0,408). Both adhesive systems showed leakage in dentin. Conclusion: It the adhesive systems had similar performance.

Key words: Enamel. Dentin. Dental Adhesives. Microleakage.

 

1 Departamento de Dentística, Universidade Norte do Paraná, Londrina, PR, Brasil
2 Departamento de Dentística, Universidade Oeste do Estado do Paraná, Cascavel, PR, Brasil

 

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