Three-dimensional fabricating material systems for producing dental products

A dental, three-dimensional technology used in the field of rapid prototyping systems that can solve problems such as reducing the porosity of dental components

Active Publication Date: 2015-08-19
DENTSPLY SIRONA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This reduces the porosity of the dental element

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Preparation of oligomers

[0066] 1176 g of trimethyl-1,6-diisocyanatohexane (5.59 mol) and 1064 g of bisphenol A propoxylate (3.09 mol) were added to the reactor under a stream of dry nitrogen, and under a positive pressure of nitrogen Heat to about 65°C. To this reaction mixture was added 10 drops of the catalyst dibutyltin dilaurate. The temperature of the reaction mixture was maintained at 65°C to 140°C for about 70 minutes before an additional 10 drops of the catalyst dibutyltin dilaurate were added. A thick paste of isocyanate-terminated intermediate formed and was stirred for 100 minutes. To this intermediate was added 662 g (5.09 mol) of 2-hydroxyethyl methacrylate and 7.0 g of BHT as inhibitors over a period of 70 minutes while maintaining the reaction temperature at 68°C-90°C. After stirring at 70°C for about 5 hours, the heating was terminated and the oligomer was collected from the reactor as a translucent flexible solid and stored in a dry atmosphere.

Embodiment 2

[0068] Preparation of monomer

[0069] 700 g of 1,6-diisocyanatohexane was added to the reaction flask and heated to about 70° C. under positive nitrogen pressure. To this reactor was charged 1027 g of 2-hydroxyethyl methacrylate, 0.75 g of the catalyst dibutyltin dilaurate and 4.5 g of butylated hydroxytoluene (BHT). The addition was slow and under a flow of dry nitrogen over a period of 2 hours. The temperature of the reaction mixture was maintained at 70°C-90°C for an additional 2 hours, and then 8.5 g of purified water was added. After 1 hour, the reaction product was drained into a plastic container as a clear liquid and cooled to form a white solid and stored in a dry atmosphere.

Embodiment 3

[0071] Preparation of monomer

[0072] 168 g of 1,6-diisocyanatohexane was added to the reaction flask and heated to about 70°C under positive nitrogen pressure. To this reactor was charged 228 g of 2-hydroxyethyl acrylate, 0.12 g of the catalyst dibutyltin dilaurate and 0.86 g of butylated hydroxytoluene (BHT). The addition was slow and under a flow of anhydrous nitrogen over a period of 2 hours. The temperature of the reaction mixture was maintained at 70°C-85°C for an additional 3 hours, and then 0.9 g of purified water was added. After 1 hour, the reaction product was drained into a plastic container as a clear liquid and cooled to form a white solid and stored in a dry atmosphere.

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Abstract

This invention relates to printable polymerizable material systems for making dental products such as artificial teeth, dentures, splints, veneers, inlays, onlays, copings, frame patterns, crowns and bridges and the like. A DLP or stereolithography printer is used to cure polymerizable material in a layer-by-layer manner to build-up the object. The resulting three-dimensional object has good dimensional stability.

Description

[0001] Cross-Referenced Related Applications [0002] This patent application claims the benefit and priority of US Provisional Patent Application Serial No. 61 / 726317, filed November 14, 2012, which is hereby incorporated by reference for all purposes. technical field [0003] The present invention generally relates to rapid prototyping systems for manufacturing dental devices such as artificial teeth, dentures, splints, veneers, inlays, fillings, copings, framework patterns, crowns and bridges, casts, appliances, and the like. More specifically, dental devices as three-dimensional objects are constructed from the novel liquid resins of the present invention using beam illumination such as stereolithography (SLA) or DLP (digital light processors such as the Perfactory system from EnvisionTec). SLA uses laser beams to map out the shape of each layer and harden the photosensitive resin in vats. The Perfactory system builds three-dimensional objects by using a digital light pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61C13/00A61K6/083A61C5/77
CPCA61K6/083A61C13/0013A61C13/0019B33Y80/00A61K6/887B33Y70/10C08L33/10B29C64/124B29C64/135B29C64/129
Inventor B·J·孙C·R·肯尼迪V·森达A·M·利奇库斯
Owner DENTSPLY SIRONA INC
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