A low-expansion high-strength dental gypsum composition, its preparation process, use method and application

A composition, high-strength technology, applied in the fields of dentistry, dental prosthesis, medical science, etc., can solve the problem of dental gypsum fluidity, initial and final setting time expansion coefficient, and strength that cannot meet the requirements of restorations at the same time, and cannot guarantee dental Gypsum performance stability, failure to reach high-precision dental restoration models, etc., to achieve good rheology and operability, shorten the setting time, and stabilize various performances

Active Publication Date: 2021-06-22
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its curing linear expansion rate is only reduced to 0.12%, which is far from reaching the high-precision dental restoration model, and it does not take into account the changes in various parameters after the plaster mold has been placed for a long time, and cannot guarantee the stability of various properties of the dental plaster sex
[0014] Therefore, it can be seen that the existing dental gypsum still has defects such as fluidity, initial and final setting time, expansion coefficient, and strength that cannot simultaneously meet the requirements of the restoration.
In addition, the existing gypsum products in the field of dental models are easy to stick, the production process is cumbersome, expensive, not environmentally friendly, and there are potential safety hazards

Method used

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  • A low-expansion high-strength dental gypsum composition, its preparation process, use method and application
  • A low-expansion high-strength dental gypsum composition, its preparation process, use method and application
  • A low-expansion high-strength dental gypsum composition, its preparation process, use method and application

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preparation example Construction

[0076] Another object of the present invention is to provide a method for preparing the low-expansion high-strength dental gypsum or gypsum composition, which specifically includes the following steps:

[0077] Step 1. Prepare hemihydrate gypsum powder.

[0078] The hemihydrate gypsum powder is α-high strength hemihydrate gypsum powder. The particle size of the hemihydrate gypsum powder is 70-130 mesh, preferably 85-115 mesh, more preferably 95-105 mesh.

[0079] Step 2, prepare each component, preferably grind separately.

[0080] The additives include one or more of water reducing agents, setting retarders, setting accelerators, reinforcing agents, crosslinking agents or defoamers.

[0081] The grinding method is manual grinding or mechanical grinding, preferably mechanical grinding.

[0082] After grinding, the particle size of the additive is 70-130 mesh, preferably 85-115 mesh, more preferably 95-105 mesh. The particle size of the additive is 70-130 mesh, preferably 8...

Embodiment 1

[0115] Various additives were placed in a tank mill and pulverized to 100 mesh. Weigh 3g AF-JFL-1, 0.2g JR, 6g aluminum stearate, 20g nano silicon dioxide, 1.5g borax, put the above additives in the mixer, and then weigh 50g of α-hemihydrate gypsum powder Add it into the mixer for mixing, mix for 60s, continue to add 100g of α-hemihydrate gypsum powder to the mixer, mix for 60s, then add 300g of α-hemihydrate gypsum powder, mix for 60s, and finally add 550g The α-hemihydrate gypsum was mixed for 60s to obtain a low-expansion high-strength dental gypsum composition.

[0116] Weigh 2000g of the above-mentioned gypsum composition, add 460g of water, let it stand for 30s, and then manually stir for 60-90s to obtain a slurry for measuring the expansion degree, initial and final setting time, linear expansion rate, and flexural resistance after 2h. compressive strength and wet compressive strength.

Embodiment 2

[0118] Various additives were placed in a tank mill and pulverized to 100 mesh. Weigh 3g AF-JFL-1, 0.4g SG, 9g aluminum stearate, 20g nano silicon dioxide, 1.5g borax, 2g emulsified silicone oil, put the above additives in the mixer, and then weigh 50g of α- Add hemihydrate gypsum powder into the mixer and mix with various additives for about 60s, continue to add 100g of α-hemihydrate gypsum powder into the mixer, mix for 60s, then add 300g of α-hemihydrate gypsum powder, Mix for 60 seconds, and finally add 550 g of α-hemihydrate gypsum and mix for 60 seconds to obtain a low-expansion high-strength dental gypsum composition.

[0119] Weigh 2000g of the above-mentioned gypsum composition, add 460g of water, let it stand for 30s, and then manually stir for 60-90s to obtain a slurry for measuring the expansion degree, initial and final setting time, linear expansion rate, and flexural resistance after 2h. compressive strength and wet compressive strength.

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Abstract

The present invention provides a dental gypsum or gypsum composition with low expansion ratio and high strength, its preparation process, use method and application. The invention uses green additives, has few additives, and has low production cost, and can simply and effectively reduce the expansion coefficient of general dental gypsum materials to a very low level. At the same time, it has comprehensive advantages such as strong operability, adjustable setting time, good mechanical properties, and stable curing performance, which better solves the difficulty of denture restoration in the oral cavity, poor adhesion, fulcrum, and insufficient retention force. Application problems such as long clinical adjustment time ensure the effect of denture restoration.

Description

technical field [0001] The invention relates to a low-expansion high-strength dental gypsum composition, its preparation process, use method and application. It is mainly used in making various oral gypsum models to produce dental restorations, and belongs to the field of medical materials or medical devices. Background technique [0002] Gypsum, as a multifunctional and widely used hydration gelling material for dental models, plays an irreplaceable role in many aspects of oral restoration. Clinically, the production of various oral restorations often needs to go through multiple steps such as tooth preparation, impression collection, and filling of plaster models, and then the production is completed on the working model. Therefore, the production of oral model is the basis and foundation of denture processing, and the quality of plaster model is the guarantee of the accuracy of the restoration. [0003] Under normal circumstances, doctors refer to various performance par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14A61C13/34
CPCA61C13/34C04B28/146C04B2111/00836C04B2111/00939C04B2201/50C04B2103/302C04B24/16C04B24/085C04B14/062C04B22/0013C04B2103/22C04B24/42C04B24/226
Inventor 周风山谢倩婷温若宋永涛
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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