Making method of fluor apatite

A technology of fluoroapatite and hydroxyapatite, which is applied in the field of fluoroapatite production, can solve the problems that the actual mechanism cannot be confirmed and the degree of demineralization can be reduced

Inactive Publication Date: 2004-02-18
文国琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since 1964, when the laser was applied to the hard tissue of the tooth[3], many reports on the application of the laser to the tooth enamel to reduce the degree of demineralization have been proposed, but the actual mechanism is still not confirmed[7,8]

Method used

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  • Making method of fluor apatite
  • Making method of fluor apatite
  • Making method of fluor apatite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Different weight percentages of calcium fluoride (5% to 35% by weight) and hydroxyapatite (65% to 95% by weight) were placed in deionized water , rolling a ball to mix for twenty-four hours. After mixing, it is taken out and dried, and the dried hydroxyapatite mixture is calcined at a temperature of 700 to 750 degrees Celsius for two hours. The calcined hydroxyapatite mixture was ground into powder by a ball mill and then dried. After the dry powder was filled with polyvinyl acetate and granulated, it was pressed into a disk with a thickness of 0.2 cm and a diameter of 1.3 cm with a pressure of 3 tons per square centimeter. The resulting disk-shaped hydroxyapatite mixture was tested Density test, scanning electron microscope analysis, X-ray diffraction analysis, differential temperature and thermogravimetric analysis were carried out on the slices. After drying, the hydroxyapatite mixture powder without adding polyvinyl acetate was coated with ethanol on the enamel su...

Embodiment 2

[0044] Calcium fluoride acts as a eutectic fusible to make fluoroapatite. Calcium fluoride is the initial reactant that causes the eutectic fusible phenomenon after research, but the calcium hydroxide produced after its reaction with hydroxyapatite is the main eutectic fusible substance. We can also make fluorapatite by mixing 70% by weight of hydroxyapatite with calcium fluoride and calcium hydroxide.

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Abstract

A process for preparing the fluorapatite (FAP) includes proportionally mixing calcium fluoride with hydroxyapatite, adding excipient, die pressing and sintering. It has high biological compatibility,so using it as biomedical material for curing teeth, etc.

Description

technical field [0001] At present, in the preventive medicine of dentists, fluorine is often used to replace the hydroxide ions in hydroxyapatite to form fluorapatite, and thereby prevent dental caries. Falk proposed in 1939 that the presence of fluorine in enamel or dentin would reduce its solubility and thus prevent dental caries [1]. Thereafter, many experiments were used to explain the above mechanism. The increase of fluoride ion concentration will reduce the solubility of apatite [2]. Under weak acid, fluoride also reduces the solubility of tooth enamel, thus preventing dental caries. However, the reaction mechanism of the above phenomenon has not yet been confirmed. Clinically, there are various ways to use fluoride. Its main concept is to form fluorapatite with stable molecular structure to improve or prolong its ability to prevent dental caries. In comparison, the efficiency and effect of traditional fluoride coating used in clinical practice are not satisfactory...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K6/838C01B25/01
Inventor 吴长奇
Owner 文国琴
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