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Preparation method of composite magnesium oxide powder for dental alginate impression material

A technology of magnesium oxide powder and dental alginate, applied in the direction of dental impression materials, magnesium oxide, dental preparations, etc., can solve the problem that the activity of a single magnesium oxide product is not well controlled and the performance indicators of magnesium oxide powder The requirements are not uniform, and it is difficult to accurately control the solidification time of the final impression material, so as to achieve the effect of accurate target solidification time, easy demolding, and complete impression

Active Publication Date: 2017-08-11
河北镁神科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the magnesium oxide in dental alginate impression materials widely used at home and abroad is mainly single-quality magnesium oxide powder. Due to the inconsistent performance indicators of magnesium oxide powder, the activity of single magnesium oxide products is not very high. Well controlled, so it is difficult to precisely regulate the setting time of the final impression material

Method used

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  • Preparation method of composite magnesium oxide powder for dental alginate impression material
  • Preparation method of composite magnesium oxide powder for dental alginate impression material
  • Preparation method of composite magnesium oxide powder for dental alginate impression material

Examples

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Effect test

Embodiment 1

[0032] A preparation method of composite magnesium oxide powder for dental alginate impression material, comprising the following steps:

[0033] (1) Select magnesium hydroxide powder raw material, its main content Mg(OH) 2 97.3%, the impurity content CaO is 1.3%, SO 4 -2 0.3%, Cl - 0.10%, 9ppm for heavy metals, 2ppm for As, 0.08% for acid insolubles, 31.5% for loss on ignition, 1.8μm for laser particle size D50, and 96 for whiteness.

[0034] (2) Add the magnesium hydroxide powder raw material into the rotary kiln calciner, control the temperature range from the front part to the rear part in the rotary kiln to be 600°C to 625°C, and control the residence time of the material in the calciner to 1.4h . The magnesia powder after calcining was passed through a vibrating sieve to obtain a magnesia powder product A with 325 meshes passing through. The range of citric acid value for chemical detection of magnesium oxide A's reactivity is 145s, and the bulk density is 0.31g / cm...

Embodiment 2

[0041] A preparation method of composite magnesium oxide powder for dental alginate impression material, specifically comprising the following steps:

[0042] (1) Select magnesium hydroxide powder raw material, its main content Mg(OH) 2 98.0%, the impurity content CaO is 1.0%, SO 4 -2 0.42%, Cl - 0.11%, 8ppm for heavy metals, 3ppm for As, 0.09% for acid insolubles, 32% for loss on ignition, 1.6μm for laser particle size D50, and 97 for whiteness.

[0043] (2) Add the magnesium hydroxide powder raw material into the rotary kiln calciner, control the temperature range from the front part to the rear part in the rotary kiln to be 700°C to 740°C, and control the residence time of the material in the calciner to 1.2h . The magnesia powder after calcining was passed through a vibrating sieve to obtain a magnesia powder product A with 325 meshes passing through. The range of citric acid value for chemical detection of magnesium oxide A reactivity is 175s, and the bulk density i...

Embodiment 3

[0050] A preparation method of composite magnesium oxide powder for dental alginate impression material, comprising the following steps:

[0051] (1) Select magnesium hydroxide powder raw material, its main content Mg(OH) 2 99.0%, impurity content CaO is 0.5%, SO 4 -2 0.32%, Cl - 0.10%, 6ppm for heavy metals, 2ppm for As, 0.08% for acid insolubles, 31.5% for loss on ignition, 1.8μm for laser particle size D50, and 97 for whiteness.

[0052] (2) Add the magnesium hydroxide powder raw material into the rotary kiln calciner, control the temperature range from the front part to the rear part in the rotary kiln to be 520°C to 550°C, and control the residence time of the material in the calciner to 1.5h . The magnesia powder after calcining was passed through a vibrating sieve to obtain a magnesia powder product A with 325 meshes passing through. The range of citric acid value for chemical detection of magnesium oxide A reactivity is 125s, and the bulk density is 0.30g / cm 3 ,...

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Abstract

The invention belongs to the field of medical biological materials and relates to composite magnesium oxide powder for dental alginate impression material used in oral orthopaedics. High-quality magnesium hydroxide and light magnesium carbonate are used as raw materials, magnesium oxide different in activity and quality is obtained in a rotary kiln or a rotational flow dynamic-state furnace through high-temperature calcination and decomposition, and the composite magnesium oxide powder is obtained through ultrafine grinding and full mixing according to a certain proportion. The prepared composite magnesium oxide powder is small in fineness, white in color, large in size, good in dispersity and adjustable in activity, is used for adjusting and controlling the setting time of the dental alginate impression material and can increase impression hardness and smoothness and decrease impression deformation.

Description

technical field [0001] The invention relates to a preparation method of composite magnesium oxide powder for dental alginate impression material, which is mainly used for preparing dental alginate impression material of various maxillofacial or oral soft tissues in oral orthopedics. Background technique [0002] With the gradual popularization of the concept of "high-quality oral cavity", many new technologies and new materials have been developed and applied in clinical work. High-precision impression materials, as advanced and excellent impression materials, have begun to be welcomed by most clinicians. and sure. There are many kinds of oral impression materials, and the impression materials used in clinical work mainly include the following types: alginate impression material, polyether impression material, synthetic rubber impression material, impression plaster and impression paste. In the process of practical application, the performance of the impression material dir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/06C01F5/08A61K6/10A61K6/90
CPCA61K6/90C01F5/06C01F5/08C01P2006/65
Inventor 毕立亨孙孟勇翟立强程刘备翟旭滨胡永琪刘润静
Owner 河北镁神科技股份有限公司
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