Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Dental impression material utilizing ruthenium catalyst

A catalyst and dental imprinting technology, applied in dental impression materials, dentistry, compression molding cups, etc., can solve the problems of platinum-based catalyst deactivation, increased time and work, expensive silicon-containing oligomers, etc.

Inactive Publication Date: 2004-01-21
THE KERR
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of catalyst requires the use of silicon-containing oligomers, which are often expensive
Also, sulfur-containing impurities present in latex gloves commonly used by dentists, as well as certain agents used in the oral cavity, may deactivate platinum-based catalysts
Additionally, there may be undesired release of hydrogen from degradation of the hydrosiloxane crosslinker present in the system
This may increase the time and effort required to make impressions with these materials as extra precautionary steps must be taken

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0017] Synthesis of norbornyl-terminated telechelic polydimethylsiloxane was performed according to the following scheme:

[0018] Equipped with mechanical stirrer, condenser and N 2 360.0 g of polydimethylsiloxane-terminated silanol (DMS-S27, n=243 from Gelest Corp.) and 4.85 g of 1% 4-(N , Triethylamine of N-dimethyl)aminopyridine. 9.02 g of 2-(5-norborn-2-enyl)-ethyl-dimethylchlorosilane was added dropwise to the flask with stirring. After the addition, the reaction temperature was raised to 70°C and stirring was continued at this temperature for 4 hours. Then, 2 mL of methanol was added to the mixture and stirring was continued for 1 more hour. The reaction mixture was then diluted with 500 mL of hexane and filtered to remove white salts. The hexane solution was washed three times with 1% hydrochloric acid and three times with deionized water. Then use Na 2 SO 4 Dry the solution. After evaporation of the solvent in vacuo, the product was obtained as a clear liqui...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A composition for use as a dental impression material including a polymerizable telechelic oligomer or polymer curable by ring-opening metathesis polymerization, a filler system, and a ruthenium carbene complex catalyst, whereby the catalyst initiates ring-opening metathesis polymerization of the composition. The invention includes a paste / paste system in which a base paste includes the polymerizable telechelic oligomer or polymer and a filler system and in which a catalyst paste includes the catalyst dissolved in an inert solvent and a filler system. The telechelic oligomer or polymer may be, for example, a polydimethylsiloxane end-functionalized with norbornyl groups. The catalyst may be, for example, a ruthenium carbene complex with a ligand having a basicity higher than tricyclohexylphosphine. The composition of the present invention exhibits reduced sensitivity to sulfur impurities.

Description

technical field [0001] The present invention relates to dental impression materials. Background technique [0002] Impression materials used in dentistry are one of several types of elastomers, such as polysulfides, condensation silicones, polyethers, or polyvinylsiloxanes (addition-curable silicones). These materials are usually two-paste systems which are mixed just before use and then brought into contact with the tooth structure. Mixing the two pastes initiates a chemical reaction that causes an elastic rubber impression to form after setting, creating a negative impression of the tooth structure involved. Addition-curable silicones exhibit fast cure rates and low shrinkage, and typically use platinum-containing hydrosilation catalysts. Catalysts of this type require the use of silicon-containing oligomers, which are often expensive. Also, sulfur-containing impurities present in latex gloves commonly used by dentists, as well as certain agents used in the oral cavity,...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): A61K6/891A61K6/90
CPCA61K6/10A61K6/90
Inventor 克里斯托斯·安杰利塔基斯陈明飞
Owner THE KERR
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com