Efeito de diferentes agentes naturais biomodificadores na adesão à dentina hígida e afetada por cárie

• Autor(a) principal: Lemos, Marcelo Victor Sidou
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/16288
• topic: Dentina; Colágeno; Cárie Dentária; Proantocianidinas

Minimally invasive dentistry has been prioritizing more conservative cavity preparations. For this reason, the employment of strategies as dentin biomodification, to ameliorate the mechanical properties of resin-dentin interface and to protect collagen fibrils from biodegradation, is highlighted as a promising technique. The present study aimed to evaluate the influence of different natural biomodification agents on resin-dentin bond strength, nanoleakage and micropermeability at sound and caries-affected dentin. The variable investigated were (1) dentin pre-treatment: absolute ethanol (control), proanthocyanidins (PACs) 2%, cardol (from cashew nut shell liquid) 2%, cardol-methacrylate 2%, cardanol-methacrylate 2% and epigallocatechin-3-gallate (EGCG) 0.1%; and (2) dentin substrate: sound dentin and artificial caries-affected dentin. Microtensile bond strength (n=6), dentin micropermeability (n=3) and interfacial nanoleakage (n=6) were assessed on a universal testing machine, confocal-laser scanning microscope and scanning electron microscope respectively. The bond strength on sound dentin was higher by using cardol-methacrylate and EGCG. On caries-affected dentin, pre-treatment using cardol-methacrylate achieved the highest bond strength. All biomodification agents reduced the nanoleakage in comparison with control, except cardanol-methacrylate. On sound dentin, the micropermeability was decreased when using cardanol- and cardol-methacrylate. Cardol-methacrylate has shown to be a promising biomodification agent thereby improving dentin bonding at both sound and caries-affected dentin.