Estudo 'In Vitro' da Infiltração Marginal em Dentes Submetidos a Diferentes Técnicas de Clareamento e Restaurados com um Sistema Adesivo/Resina Composta.
The effects of different bleaching techniques on the dental structures were assessed using microleakage tests. Sixty pre molars were used in this study according to the following procedures: group I ? a cotton pellet saturated with 30% hydrogen peroxide was placed in the pulp chamber and on the buccal surface and heated to 42 oC three times of fifteen minutes each. This procedures was repeated three times. Group II - In the pulp chamber was inserted a paste of sodium perborate and 30% hydrogen peroxide for 21 days. Every seven days the material was renewed. Group III ? The two techniques described above were associated. Group IV ? 10% carbamide peroxide was applied on the external surfaces three hours per day during 21 days (home bleaching) Group V ? Association of group II and IV techniques. Group VI- No treatments were performed in this group (Control). A CaOH2 paste was sealed in the pulp chamber for 10 days, the teeth were restored with Scotchbond Multi-uso Plus/Z-100, thermocycled and immersed in basic fucsin. The die penetration was determined in mm using the software Imagetool. The means (mm) of die penetration for groups I to VI were: 3,09; 1,83; 2,11; 2,36; 1,60; and 2,20. The microleakage occurred regardless the bleaching procedures. Group I technique exhibited higher die penetration when compared to groups II and V. The groups where sodium perborate was applied there was a trend of less die penetration.
Advisor:Norberti Bernardineli; Maria Teresa Atta Alves Bastos; Norberti Bernardineli; Maria Aparecida de a Moreira Machado
School:Universidade de São Paulo
Source Type:Master's Thesis
Keywords:adesivos dentinarios microinfiltração marginal resina composta
Date of Publication:08/05/1999