| Possible regulatory roles of silicic acid, silica and clay minerals in the formation of calcium phosphate precipitates. | |
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MedLine Citation:
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PMID: 8392326 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of silicic acid, silica and clay minerals on the conversion of amorphous calcium phosphate to hydroxyapatite (HAP) were studied in vitro by a pH drop method. At a concentration range of 0.01-0.1 mM. silicic acid stimulated the rate of HAP transformation by about 30-40%. Silica stimulated the rate of HAP transformation by 33-43% at a concentration range of 0.05-1.5 mg/ml. The clay minerals, i.e. kaolin and talc, also stimulated the rate of HAP transformation by 40-90% at a concentration range of 0.4-10 mg/ml, but mica inhibited the reaction markedly at 10 mg/ml. The distribution of silicon in human supragingival dental calculus was studied by an electron-probe microanalyser. We found localized silicon distribution on the oral surface of the calculus. Such silicon-rich areas always contained silicon either alone or together with magnesium, aluminium, potassium, calcium and iron. This implies that the silicon-rich area may be opal and mica. Because silicic acid, silica, kaolin and talc stimulated and mica inhibited the in vitro calcium phosphate precipitation, it is possible that these silicon-rich areas may regulate the formation of the dental calculus. |
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Authors:
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S Hidaka; Y Okamoto; K Abe |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Archives of oral biology Volume: 38 ISSN: 0003-9969 ISO Abbreviation: Arch. Oral Biol. Publication Date: 1993 May |
Date Detail:
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Created Date: 1993-08-12 Completed Date: 1993-08-12 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 0116711 Medline TA: Arch Oral Biol Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 405-13 Citation Subset: D; IM |
Affiliation:
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Department of Oral Biochemistry, Fukuoka Dental College, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Aluminum Silicates / chemistry* Calcium / analysis, chemistry Calcium Phosphates / chemistry* Chelating Agents / chemistry Chemical Precipitation Child Dental Calculus / chemistry, ultrastructure Durapatite Electron Probe Microanalysis Female Humans Hydrogen-Ion Concentration Hydroxyapatites / chemistry Male Middle Aged Minerals / chemistry* Phosphates / chemistry Phosphorus / analysis Silicic Acid / chemistry* Silicon / analysis Silicon Dioxide / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Aluminum Silicates; 0/Calcium Phosphates; 0/Chelating Agents; 0/Hydroxyapatites; 0/Minerals; 0/Phosphates; 0/amorphous calcium phosphate; 12001-26-2/mica; 1302-87-0/clay; 1306-06-5/Durapatite; 1343-98-2/Silicic Acid; 7440-21-3/Silicon; 7440-70-2/Calcium; 7631-86-9/Silicon Dioxide; 7723-14-0/Phosphorus |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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