Document Detail

Antibacterial and physical properties of calcium-phosphate and calcium-fluoride nanocomposites with chlorhexidine.
MedLine Citation:
PMID:  22317794     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: Previous studies have developed calcium phosphate and fluoride releasing composites. Other studies have incorporated chlorhexidine (CHX) particles into dental composites. However, CHX has not been incorporated in calcium phosphate and fluoride composites. The objectives of this study were to develop nanocomposites containing amorphous calcium phosphate (ACP) or calcium fluoride (CaF(2)) nanoparticles and CHX particles, and investigate Streptococcus mutans biofilm formation and lactic acid production for the first time.
METHODS: Chlorhexidine was frozen via liquid nitrogen and ground to obtain a particle size of 0.62 μm. Four nanocomposites were fabricated with fillers of: nano ACP; nano ACP+10% CHX; nano CaF(2); nano CaF(2)+10% CHX. Three commercial materials were tested as controls: a resin-modified glass ionomer, and two composites. S. mutans live/dead assay, colony-forming unit (CFU) counts, biofilm metabolic activity, and lactic acid were measured.
RESULTS: Adding CHX fillers to ACP and CaF(2) nanocomposites greatly increased their antimicrobial capability. ACP and CaF(2) nanocomposites with CHX that were inoculated with S. mutans had a growth medium pH>6.5 after 3 d, while the control commercial composites had a cariogenic pH of 4.2. Nanocomposites with CHX reduced the biofilm metabolic activity by 10-20 folds and reduced the acid production, compared to the controls. CFU on nanocomposites with CHX were three orders of magnitude less than that on commercial composite. Mechanical properties of nanocomposites with CHX matched a commercial composite without fluoride.
SIGNIFICANCE: The novel calcium phosphate and fluoride nanocomposites could be rendered antibacterial with CHX to greatly reduce biofilm formation, acid production, CFU and metabolic activity. The antimicrobial and remineralizing nanocomposites with good mechanical properties may be promising for a wide range of tooth restorations with anti-caries capabilities.
Lei Cheng; Michael D Weir; Hockin H K Xu; Alison M Kraigsley; Nancy J Lin; Sheng Lin-Gibson; Xuedong Zhou
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2012-02-06
Journal Detail:
Title:  Dental materials : official publication of the Academy of Dental Materials     Volume:  28     ISSN:  1879-0097     ISO Abbreviation:  Dent Mater     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-04-09     Completed Date:  2012-09-25     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  8508040     Medline TA:  Dent Mater     Country:  England    
Other Details:
Languages:  eng     Pagination:  573-83     Citation Subset:  D    
Copyright Information:
Copyright © 2012 Academy of Dental Materials. All rights reserved.
Biomaterials & Tissue Engineering Division, Department of Endodontics, Prosthodontics and Operative Dentistry, University of Maryland Dental School, Baltimore, 21201, USA.
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MeSH Terms
Anti-Bacterial Agents / chemistry,  pharmacology*
Bacterial Load / drug effects
Biofilms / drug effects
Bisphenol A-Glycidyl Methacrylate / chemistry
Calcium Fluoride / chemistry,  pharmacology*
Calcium Phosphates / chemistry,  pharmacology*
Chlorhexidine / chemistry,  pharmacology*
Composite Resins / chemistry,  pharmacology*
Dental Materials / chemistry,  pharmacology*
Glass / chemistry
Glass Ionomer Cements / chemistry
Hydrogen-Ion Concentration
Lactic Acid / analysis
Materials Testing
Microbial Viability / drug effects
Microscopy, Electron, Scanning
Nanocomposites / chemistry*
Particle Size
Polyethylene Glycols / chemistry
Polymethacrylic Acids / chemistry
Resin Cements / chemistry
Streptococcus mutans / drug effects
Stress, Mechanical
Grant Support
Reg. No./Substance:
0/Anti-Bacterial Agents; 0/Calcium Phosphates; 0/Composite Resins; 0/Dental Materials; 0/Glass Ionomer Cements; 0/Polyethylene Glycols; 0/Polymethacrylic Acids; 0/Resin Cements; 0/amorphous calcium phosphate; 109-16-0/triethylene glycol dimethacrylate; 1565-94-2/Bisphenol A-Glycidyl Methacrylate; 50-21-5/Lactic Acid; 55-56-1/Chlorhexidine; 7789-75-5/Calcium Fluoride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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