Abstract

PADROS-SERRAT, José Luis; MONTERRUBIO-BERGA, Margarita  and  PADROS-CRUZ, Esteban. Self-etching adhesives: To etch or not to etch?. RCOE [online]. 2003, vol.8, n.4, pp.363-375. ISSN 1138-123X.

Abstract: Introduction: In the present study we try to analyse if we can improve the bond strength and seal of self-etching adhesives to enamel and dentin, by etching with phosphoric acid for 15 seconds or etching followed by deproteinization with sodium hypochlorite 5% for 30 seconds. Material and method: The duel technique is used to compare the different techniques one by one against the others. In the first part the coronal 1/3 of 120 human molars is cut to test bond strength to enamel. A different technique is used on each side and both parts are bonded with composite resin. By pulling with an Instron machine, we were able to compare which system is stronger in groups of 10. In the second part, 120 human teeth are horizontally cut 2,5mm apical to the enamel margin to test bond strength to dentin. Again a different technique is applied to each side and both sides are bonded with composite resin. In the third part we take 36 human teeth and cervical cavities are prepared in buccal and lingual sides and the teeth are submerged in dye to evaluate leakage. The bonding systems tested were Clearfil SE Bond, Xeno III, One Step Plus + Tyrian SPE and Prompt-L-Pop. Results: Etching with phosphoric acid or etching followed by sodium hypochlorite rinse improve bond strength in enamel and dentin but only significatively for Prompt-L-Pop and One Step Plus. Leakage tests reveal permeability in enamel margins for all self-etching adhesives tested that was not present when cavity was etched, wich seems to indicate that etching of enamel margins when using self-etching bonding systems might be useful. There were no differences between etching or etching followed by sodium hypochlorite rinse before applying the adhesive.

Keywords : Bond; Self-etch; Leakage; Enamel; Dentin; Hybrid layer; Bond strength; Hypochlorite; Dye.

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