Ultrastructural evaluation of the hybrid layer after cementation of fiber posts using adhesive systems with different curing modes.
This in vitro study evaluated the adhesive interface of intraradicular fiber glass posts and root dentin using scanning electron microscopy (SEM). Forty-eight single-rooted premolars were randomly divided into 6 groups consisting of chemical, dual, or light cured adhesive systems combined with either chemical or dual cure resin cements. Scanning electron microscopic analysis showed the best results for continuity, density and morphology of the hybrid layer and resin tags for the combination of a self-cure adhesive with self-cure cement resin, followed by a dual-cure adhesive with self-cure cement resin, and finally a light-cure adhesive with self-cure cement. For the dual-cure resin cement, the same relation may be observed. The apical third was the most critical region for evaluated the criteria for all combinations of materials (Kruskal-Wallis and Friedman tests; p<0.001). Generally, the simplification of steps in the adhesive system and the polymerization reaction of resin adhesives and cements produced a direct effect on the quality of the adhesive post/dentin substrate interface.
Department of Restorative Dentistry, Dental School, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil.
Luciana Rigueira
LR
Abou-Id
Luís Fernando S A
LF
Morgan
Gerluza Aparecida Borges
GA
Silva
Luiz Thadeu de Abreu
LT
Poletto
Lincoln Dias
LD
Lanza
Rodrigo de Castro
Rde C
Albuquerque
D002484:Cementation / Q000379:methods*; D003188:Composite Resins / Q000737:chemistry*; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry*; D014092:Tooth Root / Q000648:ultrastructure*
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements