| The effects of boric acid and phosphoric acid on the compressive strength of glass-ionomer cements. | |
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MedLine Citation:
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PMID: 16045978 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: Both boric acid (H3BO3) and phosphoric acid (H3PO4) are components of dental cements, commonly incorporated into glass (as ingredients in the melt) and occasionally added to the powder or liquid components. This study investigated the effect of boric acid addition to an experimental glass-ionomer powder and the effect of phosphoric acid addition to a glass-ionomer liquid on the 24-h compressive strength. METHODS: Boric acid powder was added in various concentrations to an experimental glass-ionomer powder and, separately, phosphoric acid was added to an experimental glass-ionomer liquid. Powders and liquids were dosed into capsules at various powder:liquid ratios and cements thus formed were assessed for 24-h compressive strength. RESULTS: Incorporation of boric acid in glass-ionomer powder resulted in a pronounced decrease (p < 0.05 at 1% boric acid) in compressive strength. Addition of phosphoric acid produced initially stronger cements (up to 13% increase at 1% phosphoric acid) before also declining. SIGNIFICANCE: The incorporation of less than 2% w/w phosphoric acid in glass-ionomer liquids may improve cement strengths without compromising clinical usefulness. The incorporation of boric acid in glass-ionomer cements is contraindicated. |
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Authors:
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Leon H Prentice; Martin J Tyas; Michael F Burrow |
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Publication Detail:
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Type: Journal Article Date: 2005-07-19 |
Journal Detail:
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Title: Dental materials : official publication of the Academy of Dental Materials Volume: 22 ISSN: 0109-5641 ISO Abbreviation: Dent Mater Publication Date: 2006 Jan |
Date Detail:
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Created Date: 2005-12-19 Completed Date: 2006-03-23 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8508040 Medline TA: Dent Mater Country: England |
Other Details:
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Languages: eng Pagination: 94-7 Citation Subset: D |
Affiliation:
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School of Dental Science, University of Melbourne, 711 Elizabeth Street, Parkville, Victoria 3010, Australia. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Boric Acids
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chemistry* Compressive Strength Dental Materials / chemistry* Glass Ionomer Cements / chemistry* Humans Materials Testing Phosphoric Acids / chemistry* Powders Solutions Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Boric Acids; 0/Dental Materials; 0/Glass Ionomer Cements; 0/Phosphoric Acids; 0/Powders; 0/Solutions; 11113-50-1/boric acid; 7664-38-2/phosphoric acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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