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Effectiveness of two self-etchings bonded clinically in caries affected dentin with homogeneous smear layer

Pinna, Roberto and Usai, Paolo and Arrica, Mariantonietta and Milia, Egle Patrizia (2014) Effectiveness of two self-etchings bonded clinically in caries affected dentin with homogeneous smear layer. Journal of nanomaterials , Article ID 489183. ISSN 1687-4129. eISSN 1687-4110. Article.

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Abstract

Aim. To examine the interface of two self-etchings in carious affected dentin (CAD), under clinical conditions. Materials and methods. Class I cavities were prepared in 21 carious premolars, refining them by the use of a fine diamond bur in order to create similar smear layer interference. The mild self-etching Clearfil SE Bond (CSE), pH = 2.0, and the strong Tyrian SPE-One Step Plus (TSO), pH = 0.5, were applied followed by a composite. Teeth were extracted and processed for TEM. The primer’s osmolarity of the self-etchings was also calculated using a microosmometer. Results. CSE hybrid layer retained smear layer residues and scattered crystallites as an effect of the mild acidity. A high presence of hydroxyapatite still protected the affected fibres within the hybrid layer. CSE primer demonstrated values of 3220 mOsm/kg. TSO interdiffusion showed strong demineralization. Resin tags were not formed in the dentinal tubules which remained obstructed by crystals. However, dissolution of peritubular dentin and porosities were observed in the intertubular regions. The osmolarity of TSO was 8200 mOsm/kg. Conclusion. Increasing the acidity and osmolarity of the self-etchings increases interference in the homogeneous reinforcement of CAD, which may predispose the hybrid layer to instability and hydrolytic degradation overtime.

Item Type:Article
ID Code:10547
Status:Published
Refereed:Yes
Uncontrolled Keywords:Adhesive dentistry, carious affected dentin (CAD), self-etching systems, smear layer
Subjects:Area 06 - Scienze mediche > MED/28 Malattie odontostomatologiche
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze Chirurgiche, Microchirurgiche e Mediche
Publisher:Hindawi Publishing Corporation
ISSN:1687-4129
eISSN:1687-4110
Copyright Holders:© Roberto Pinna et al.
Deposited On:19 Dec 2014 11:03

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