FR3106969A3 - PROCESS FOR MANUFACTURING A DENTAL IMPRESSION - Google Patents

Abstract

The invention relates to a method of manufacturing a removable dental prosthesis impression (FIG 3) comprising: a step of 3D modeling a removable dental prosthesis. a 3D modeling step of a removable dental prosthesis impression (5) - a 3D printing step in a soft or flexible material of this removable dental prosthesis impression Removable dental prosthesis impression obtained by this process

Description

PROCESS FOR MANUFACTURING A DENTAL IMPRESSION

The present invention relates to a method of manufacturing a removable dental prosthesis impression.

It relates more particularly to the three-dimensional manufacture of a custom 3D printed impression with a soft or flexible material.

A removable dental prosthesis refers to a medical device made to measure in resin with an insertion of a metal frame and one or more prosthetic teeth in composite or resin (the metal frame is sometimes absent from the medical device but this does not change the term removable dental prostheses) whose role is to replace between 1 and 14 missing teeth in the mouth of a human being and which can be easily removed from the mouth by the patient himself, without any tools. A removable dental prosthesis can be commonly referred to as a denture.

A flexible or flexible impression of a removable dental prosthesis designates a molding of the prosthetic teeth and false gums of a removable dental prosthesis being produced by a dental prosthetist, this impression is called by dental prosthetists: key or key or key silicone or silicone key or silicone registration key or silicone registration key or repositioning key or repositioning key. a removable dental prosthesis;

A model refers to a term of the profession of dental technician, it is sometimes called a dental model, it is a physical and precise representation of a patient's mouth. A model allows dentures to be made without being in the patient's mouth. A model is made in plaster following an impression made in alginate or silicone by a dental surgeon in the mouth of a patient or a model can be made in resin by 3D printing following the taking of an impression by the dental surgeon with an intraoral scanner.

A prosthetic tooth designates a false tooth made of composite or resin materials intended to physically replace an absent natural tooth.

A false gum indicates the support of the prosthetic tooth, its material is resin. Pink in color, this false gum helps to imitate the gum of natural teeth absent by artificially restoring it.

Three-dimensional modeling is a 3D design of a digital file that represents an object in 3 dimensions. Computer-aided design, which stands for CAD, is also a synonym for three-dimensional modeling.

A three-dimensional model is often a digital file with an STL or DCM or DICOM or PLY extension. In computing, a file name extension is a file name suffix made to identify its format.

The computer-aided design of removable 3D dentures is now easily done by dental technicians but it does not exist on the market

solution for the digital production of flexible or flexible silicone impressions by 3D printing.

When the dental technician has digitally modeled a dental prosthesis

removable containing teeth, gums, and metal frame, it can do nothing. He must resume the rest of his work manually with a work on wax to then make a silicone key. It is long, off-putting, repetitive, dirty, imprecise.

The object of the present invention is a method which improves the ease and speed of manufacturing a silicone key and therefore a removable dental prosthesis impression, and can be integrated in a context of automation and / or industrialization, or even reduction of repetitive stains, thanks to digital technology, in fact digital work in this case replaces a large part of manual design (elimination of wax work, elimination of manual grinding of industrial teeth, elimination of manual work). placement in the articulator to check the occlusion).

Indeed, CAD software for dental prosthetists (examples of brands 3shape, dentalwing, exocad etc.) allow dental prosthetists to produce by computer-aided design a removable dental prosthesis, with teeth, gums and a frame; the dental technician can then extract this modeling with his model in a form of 3D file called STL (the STL file format is a digital format used in stereolithography software to represent an object in 3 dimensions)

The resulting stl file can then be exported to computer aided design software, here are some examples of brands: maya, solidworks, meshmixer etc. All geometric modeling or CAD software can be used.

These CAD software allow by surface modeling (modeling from a 3D surface), or by homothetic extrusion of a surface, or by Boolean operation of a preconceived geometric shape in the form of a footprint (subtraction of collisions between 2 files 3D), to create the desired area to make a removable dental prosthesis impression in 3D.

Ideally, the walls of the impression thus made are 4 millimeters thick.

These same CAD software make it possible to extract the impression thus produced in an STL format, therefore 3D; this allows 3D printing by additive manufacturing of said imprint.

A flexible or flexible custom impression is 3D printed by additive manufacturing, and can be produced by different technologies:

• stereolithography (or SLA, English term "stereo lithograph apparatus");
• or digital processing of light (or DLP, acronym for the English terms “digital light projecting”);
• or deposition of fused filament (or FDM, acronym for the English terms “fused deposition modeling”);
• or PolyJet process. Patented technology for the light-curing of liquid photopolymer droplets
• or PROJECT a patented 3d printing technology from the manufacturer 3d system

All of these 3D production processes are aimed at printing soft or flexible materials with different shore hardnesses to obtain the flexibility or flexibility desired to make the impression of the removable dental prosthesis. In general, shore hardness is expressed by the number 80 for impressions of removable dental prosthesis, but it is possible to obtain correct results with shore hardnesses from 0 to 95. Shore hardness is also sometimes expressed by letters from A at D, in the case of the patent presented, a shore hardness of A, B or C is also correct.

There are many soft or flexible photopolymerizable resins on the market (photocentric brand, basf etc.) or 3D printing filaments often called TPU or flexible filament or flexible filament (example zortrax brand elastomer, ultimaker flexible filament etc.)

The flexible or flexible 3D printed removable dental prosthesis impression will serve exactly like a silicone key (old technique)

The dental prosthetist will thus be able to machine composite or resin teeth with a machining machine with tailor-made precision, he will also be able to 3D print them by additive manufacturing (SLA or DLP or FDM), then assemble them in the dental prosthesis impression. removable, clip everything on a model and pour or stuff its resin in the traditional way to then polymerize everything in water at about 40 degrees

Example of production and use of a flexible or flexible impression of a removable dental prosthesis, subject of this patent:

1

- digital file of a model (1) from a 3-shape scanner in STL format

2

- three-dimensional modeling of a dental prosthesis (2) performed by a dental technician with prosthetic teeth (3) and a false gum (4) with 3 shape CAD software in STL format

3

- 3D modeling of a removable dental prosthesis impression in STL format (5)

4

- three-dimensional extraction by Boolean subtraction operation of the impression of removable dental prosthesis in STL format. Interior view of impression (5)

5

-STL file of prosthetic teeth extracted from the 3 shape software and machined in a DGSHAPE 5-axis machine. The prosthetic teeth are machined from an IVOCLAR brand dental-colored composite disc

6

3D printing of the STL file of the removable dental prosthesis impression in a FORMLABS brand SLA printer with transparent photopolymerizable resin from the PHOTOCENTRIC brand UV DLP FLEXIBLE in 405 NM shore hardness of 80.

7

The machined teeth are clipped into their housing in the removable dental prosthesis impression

8

The set is filled with self-curing dental pink resin from IVOCLAR PROBASE COLD and clipped onto the model.

9

The whole is placed in water at 45 degrees for 20 minutes in a pressure cooker under atmospheric pressure of 2 bars. (a casserole dish is an atmospheric pressure pot that looks like a pressure cooker or pressure cooker)

10

The assembly is removed from the pressure cooker, the removable denture impression is removed and releases a completed denture.

11

It will remain to polish the dental prosthesis thus produced.

Claims (1)

3D manufacturing process of a removable dental prosthesis impression made of soft or flexible material, said process comprising the following steps:

1. -a 3D modeling step of a removable dental prosthesis
2. -a 3D modeling step of a removable dental prosthesis impression including the prosthetic teeth and the false gingiva.
3. -a 3D printing step in soft or flexible materials of the removable dental prosthesis impression.