Resin Replica in Enamel Deproteinization and its Effect on Acid Etching

Abstract

Purpose: The goal of this in vitro study was to identify the topographical features of deproteinized (NaOCl)and etched with phosphoric acid (H3PO4) enamel surface, compared to phosphoric acid surface alone with a Resin Replica model. Materials: Ten extracted lower first and second permanent molars were polished with pumice and water, and then divided into 3 equal buccal sections having similar physical and chemical properties. The enamel surfaces of each group were subjected to the following treatments: Group A: Acid Etching with H3PO4 37% for 15 seconds. Group B: Sodium Hypochlorite (NaOCl) 5.25% for 60 seconds followed by Acid Etching with H3PO4 37% for 15 seconds. Group C; No treatment (control). All the samples were treated as follow: Adhesive and resin were applied to all groups after A, B and C treatment were performed; Then enamel/dentin decalcification and deproteinization and topographic SEM Resin Replica assessment were used to identify resin tags enamel surface quality penetration. Results showed that group B reached an area of 7.52mm2 of the total surface, with a 5.68 mm2 (73%)resin tag penetration equivalent type I and II etching pattern, 1.71 mm2 (26%) equivalent to type III etching pattern and 0.07 mm2 (1%)unaffected surface. Followed by group A with 7.48 mm2 of the total surface, with a 3.47 mm2 (46 %)resin tag penetration equivalent to type I and II etching pattern, 3.30 mm2 (45 %)equivalent to type III etching pattern and 0.71 mm2, and (9 %) unaffected surface. Group C did not show any resin tag penetration. A significant statistical difference (P <0,001) existed between groups A and B in resin quality penetration, leading to the conclusion that when the enamel is deproteinizated with 5.25% NaOCl for 1 minute prior H3PO4,the surface and topographical features of the replica resin penetration surface increases significantly with type I-II etching pattern.

Consequences of enamel preparation with sodium hypochlorite, polyacrylic and phosphoric acids for the bonding of brackets with resin-modified glass ionomer cements

“…Espinosa et al 12 conducted a study that aimed to assess whether the retentive properties of enamel improved with the use of 5.25% NaOCl as a step prior to acid conditioning (37% PA). A larger number of type 1 and 2 decalcification patterns were observed, whereas a predominance of type 3 patterns was noted in the absence of NaOCl.…”

“…Espinosa et al 12 and Justus et al 17 were pioneers in evaluating whether enamel deproteinization with NaOCl prior to PA conditioning would increase the shear BS of brackets bonded with RMGIC. The BS of these brackets was compatible with that obtained with composite resin.…”

“…The use of 5.25% sodium hypochlorite (NaOCl) as a enamel deproteinizing agent prior to acid conditioning and bracket bonding with RMGIC has been suggested as a means of increasing bond strength. The removal of organic matter and the acquired pellicle from the enamel would affect the quality of the conditioning performed [11][12][13] and consequently increase the BS. However, the number of studies supporting these assumptions is limited and the type of acid (PA) used after deproteinization was not the one recommended by the RMGIC manufacturer.…”

Improvement of enamel bond strengths for conventional and resin-modified glass ionomers: acid-etching vs. conditioning

“…Enamel bond strengths depend on the etching agents, acid concentration, and etching time (Bishara et al, 2000b;Movahhed et al, 2005;Espinosa et al, 2010). Phosphoric acid etching on enamel surfaces has been widely used as a standard bonding procedure using etch-and-rinse adhesives (Buonocore, 1955;de Munck et al, 2005;van Meerbeek et al, 2010;Pashley et al, 2011).…”

Comparación De La Fuerza Adhesiva Y El Tipo De Falla De Dos Sistemas Adhesivos Para Ortodoncia

“…[3][4][5][6][7] Así mismo, a pesar de que autores como Kaaden y colaboradores concluyeron que la fuerza adhesiva de los sistemas autograbadores en el esmalte era significativamente menor que en la dentina, 8 la adhesión al tejido adamantino producida por este tipo de materiales ha sido variable principal de estudio en diversas investigaciones.…”