Document Detail

Modifications of the organic and mineral fractions of dental tissues following conditioning by self-etching adhesives.
MedLine Citation:
PMID:  21094199     Owner:  NLM     Status:  In-Data-Review    
OBJECTIVES: Our objective was to analyse the acid strengths and concentrations in contemporary self-etch adhesives and test whether the adhesion/decalcification concept functions the same way for all products.
METHODS: The self-etching adhesives were dissolved in a 50% water-ethanol solvent, these were reacted with biological apatite (HA) in the form of powder of human dentine in order to quantify calcium release and study the reaction products as a function of acid strengths and concentrations. The four self-etching adhesives investigated were AdheSE One (Ivoclar Vivadent, Schaan, Liechtenstein), Adper Easy Bond (3M ESPE, St Paul, MN, USA), Optibond All-In-One (KERR, Orange, CA, USA), Xeno V (Dentsply De Trey, Konstanz, Germany).
RESULTS: Acid concentrations were found to span the range from 1 to 2mmol/l, and the acid dissociation constants varied between apparent pKa values of 3.4 and 4.2. The pH values changed with time from values near 2.8 to 3.6, confirming the buffering action of HA. The stronger acids dissolved more calcium ions but left less organic matter attached to the tissue particles. Thermogravimetric and infrared analysis demonstrated that the weaker acids tended to bind to HA surfaces and increased significantly the organic to mineral ratios of the powders.
CONCLUSION: Self-etching adhesives can be differentiated and classified in two types: weak acids attach to the mineral phase and leach little calcium; strong acids bind to the calcium ions, demineralize more and tend to debond from the dentinal hard tissues by forming more soluble calcium salts.
Farimata Dieng-Sarr; Patrick Sharrock; Firas Dabsie; Geneviève Grégoire
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Publication Detail:
Type:  Journal Article     Date:  2010-11-19
Journal Detail:
Title:  Journal of dentistry     Volume:  39     ISSN:  1879-176X     ISO Abbreviation:  J Dent     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-01-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0354422     Medline TA:  J Dent     Country:  England    
Other Details:
Languages:  eng     Pagination:  141-7     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2010 Elsevier Ltd. All rights reserved.
Department of Biomaterials, Faculty of Odontology, University Toulouse III, 31062 Toulouse, France.
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