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| Author(s): |
Alberth David Correa Medina
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba |
| Defense date: | 2009-01-29 |
| Examining board members: |
Mário Alexandre Coelho Sinhoreti;
Ewerton Nocchi Conceição;
Susana Maria Werner Samuel;
Bruno Lopes da Silveira;
Mario Fernando de Goes
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| Advisor: | Mário Alexandre Coelho Sinhoreti |
| Abstract | |
Indirect esthetic restorations have been considered an excellent restorative alternative for extensive cavities. However, this type of restoration demands a more invasive preparation, which may cause post-operative sensibility and incompatibility between resin cement and adhesive system. In attempt to minimize these limitations the Resin Coating Technique (RCT) has been proposed. This technique consists in protecting the exposed dentin after the cavity preparation with an adhesive, followed by the application or not application of a liner (hydrophobic monomer or low viscosity resin). The effectiveness of this technique was reported in several studies, however, little is known about the appropriate combination between adhesive and liner and the behavior of this RCT with different resin cements. Therefore, the aims of this study were: evaluate the influence of the combination of different materials used in the RCT on the marginal adaptation, bond strength and nanoleakage of indirect restorations and after identify the most appropriate combination for the RCT, was evaluated the behavior of this RCT with different resin cements using the marginal adaptation and bond strength tests. For these studies were evaluated etch and rise adhesive system (2 and 3 steps) and self-etch adhesives (2 and 1step) followed of the application of liner layer (hydrophobic monomer or low viscosity resin). In all evaluated combinations, the groups that showed low results in marginal adaptation and bond strength were the combinations that not used a liner. The group self etch 2 steps/flow composite resin, showed high bond strength and low nanoleakage. However, in all the restorations showed marginal disadaptation and nanoleakage, independent of the material combinations used for the resin coating. In the study about the interaction of the RCT with the type of resin cement (Self-etching, Self-Adhesive and Chemical Cure) evaluating marginal adaptation and bond strength, was obtained the highest bond strength for the Self-etch group, however, there is no difference between groups for marginal adaptation. So, within the limits of this study, it can be concluded that the use of a liner is necessary for a better marginal adaptation using the RCT. The combination of self etch 2steps/flow composite resin showed high bond strength and low nanoleakage. The self etch resin cement revealed high bond strength showing more compatibility with the RCT. (AU) | |