Resumen

GALDAMES, Blas et al. Different protocols for acid etching in dentin; micromorphological study. Rev. Clin. Periodoncia Implantol. Rehabil. Oral [online]. 2018, vol.11, n.2, pp.91-97. ISSN 0719-0107.  http://dx.doi.org/10.4067/S0719-01072018000200091.

Evaluate in endodontically treated teeth the effects of different etching protocols on dentinal tubule exposure and diameter at three dentin zones. Sixty healthy first premolars from human volunteers were studied. Each tooth received endodontic treatment. Teeth were transversely sectioned 5 mm below amelocemental junction and longitudinaly sectioned in the buccolingual direction, obtaining two crown halves. Each crown half was grouped according to etching protocol into: Control, EDTA, H3PO4 15 and 45 sec., y H3PO4 15 and 45 seg. + NaOCl. Three dentinal areas were analyzed with scanning electron microscope (SEM) within each tooth: coronal dentin, pulp chamber dentin and the beginning of the root canal. Comparison between dentin zones for each treatment was made with Student’s t-test for paired data, using P<0.05 for statistical significance. No significant differences in dentinal tubule exposure within the three studied zones were found. However, when comparing tubule diameter, higher values were obtained at the three dentin zones studied when H3PO4 and NaOCl wer used in combination. The results of this study showed heterogeneous behavior of different dentin zones after exposing them to various total etch protocols. The use of 37% H3PO4 for 15s did not ensure a uniform etch in the three studied zones. Protocols with H3PO4 for 45s with 5%NaOCl for 1 min, incorporated as a deproteinizing agent, could allow more predictable and appropriate etching patterns in endodontically treated teeth.

Palabras clave : Dental bonding; Acid etching; Dentin permeability.

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