Document Detail

Constant composition dissolution of mixed phases. II. Selective dissolution of calcium phosphates.
MedLine Citation:
PMID:  12686190     Owner:  NLM     Status:  MEDLINE    
Characterization of the dissolution kinetics of individual synthetic and biological calcium phosphates is of considerable importance since these phases often coexist in biological minerals. The constant composition method has been used to study the dissolution kinetics of a series of synthetic calcium phosphates, brushite (DCPD), beta-tricalcium phosphate (TCP), octacalcium phosphate (OCP), hydroxyapatite (HAP), and carbonated apatite (CAP) in the presence and absence of citric acid, as a function of pH and thermodynamic driving force. While citric acid markedly accelerates the dissolution of TCP, HAP dissolution is significantly inhibited. Moreover, this additive has almost no influence on the dissolution of DCPD, OCP, and CAP. Dual constant composition dissolution studies of mixed calcium phosphates in the presence of citric acid have also been made. Another factor, pH, also plays an important role in the dissolution of these calcium phosphates. In suspensions of calcium phosphate mixtures, specific phases can be selectively dissolved by changing experimental parameters such as pH and the presence of rate modifiers. This result has important applications for the dissolution control of dental hard tissues such as dentin, enamel, and calculus.
Ruikang Tang; Michael Hass; Wenju Wu; Stacey Gulde; George H Nancollas
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  260     ISSN:  0021-9797     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2003 Apr 
Date Detail:
Created Date:  2003-04-10     Completed Date:  2003-07-31     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  379-84     Citation Subset:  IM    
Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.
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MeSH Terms
Calcium Phosphates / chemistry*
Hydrogen-Ion Concentration
Suspensions / chemistry
Grant Support
Reg. No./Substance:
0/Calcium Phosphates; 0/Suspensions

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