CN109394367B - Method for 3D printing of rapid renewable 316L stainless steel coated teeth - Google Patents

Abstract

The invention discloses a method for quickly regenerating 316L stainless steel coated teeth by 3D printing, which constructs an individualized denture model by laser scanning assistance, prepares a denture main body by doping zirconium dioxide powder, a small amount of fullerene and carbon nano tube powder under the 3D printing technology, prepares a denture base with thin to thick pores by doping 316L stainless steel powder, a small amount of fullerene and carbon nano tube powder, and carries out coating treatment on the denture base, thereby overcoming the problems that pure metal materials are not attractive, pure ceramic materials are too fragile and the recovery period is long after implantation, leading people to feel that the denture and gingiva are long together, and finally obtaining the individualized denture with high accuracy, high wear resistance, high acid and alkali resistance, high mechanical strength and high biocompatibility.

Description

Method for 3D printing of rapid renewable 316L stainless steel coated teeth

Technical Field

The invention relates to the field of tooth preparation, in particular to a method for 3D printing of a rapid renewable 316L stainless steel coated tooth, which is used for manufacturing an individual denture, repairing tooth defects and recovering tooth functions.

Background

3D printing is based on digital model files, and is a technology for constructing objects by using powdery metal or plastic and other bondable materials in a layer-by-layer printing mode.

Zirconium dioxide is an excellent biological material, has good biocompatibility and is superior to various metal alloys including gold. The zirconium dioxide has no irritation and anaphylactic reaction to gum, is very suitable for being applied to oral cavity, avoids adverse reactions such as allergy, irritation, corrosion and the like generated by metal in the oral cavity, has extremely low heat conducting property, light weight and is more comfortable for patients to wear.

The zirconium dioxide porcelain tooth has unique aesthetic property, good light permeability, is close to a real tooth, and has no radiation blocking effect like other porcelain teeth. The color of the base crown of the zirconium dioxide ceramic is tooth white, so that the neck part cannot become black, darken and turn green, and the problem that the metal porcelain crown is most difficult to solve is solved. The zirconia full-ceramic tooth has the advantages of high mechanical strength, high hardness, high wear resistance, high corrosion resistance and the like, breaks through the limit of the traditional ceramic tooth, does not need to be supported by metal at all, is completely made of biological ceramic, is far away from various electromagnetic wave interferences in life, and does not leave hidden danger.

The 316L stainless steel has excellent mechanical property and biocompatibility, has non-magnetic characteristic, has better corrosion resistance compared with other stainless steel, is convenient to manufacture and low in price, thereby being widely applied to medical clinic, has the functions that cobalt-based alloy, titanium-based alloy and novel biomedical materials cannot be replaced, and can solve the problem of bioactivity through a bioactive ceramic film coating although the bioactivity is relatively poor.

The traditional method for preparing the false tooth at present is usually hot-press molding after high-temperature melting, the method usually involves manual oral cavity impression, and when the tray is taken out from the mouth of a patient, precision errors can be generated, so that the manufactured dental restoration is not closed, the comfort of the patient and the wear resistance, mechanical strength and service life of the false tooth are affected, the required surface characteristics of the false tooth are printed out through laser scanning and the appearance characteristics of the tooth engaged with the false tooth, the occlusion degree of the false tooth can be enhanced, the false tooth closely attached to the dental bed of the human body can be processed, and the wear resistance, acid-base resistance and mechanical strength of the false tooth are improved.

The hydroxyapatite is a main inorganic composition component of human bone tissue, calcium and phosphorus can be released out of the surface of the material to be absorbed by the body tissue after being implanted into a human body, new tissue grows, the material is healthy and bright and white, dental plaque can be removed, tooth decay is prevented, breath is freshened, and gum problems are improved.

Fullerenes are the third allotrope of elemental carbon found. The fullerene has a similar structure to graphite, but the structure of the graphite has only six-membered rings, and five-membered rings possibly exist in the fullerene, so that the surface of the fullerene material has active functional groups, the cell and biological reaction activity of the material is greatly improved, and the fullerene is easy to dope and chemically modify, so that the functional groups are easier to accept.

The carbon nano tube has good mechanical property, the tensile strength reaches 50-200 GPa, the density is 100 times of that of steel, but is only 1/6 of that of steel, which is at least one order of magnitude higher than that of conventional graphite fiber, and the elastic modulus of the carbon nano tube can reach 1TPa, which is equivalent to that of diamond and is about 5 times of that of steel. Carbon nanotubes are the material with the highest specific strength that can be prepared at present. If other engineering materials are used as a matrix and carbon nanotubes are made into the composite material, the composite material can be made to have good strength, elasticity, fatigue resistance and isotropy, and the performance of the composite material is greatly improved.

The biological material must meet the special requirements of macrostructure, microstructure and chemical composition to have osteoinductive property, the pores in the interconnected porous structure are an important feature, a protective area without strong fluid movement can be provided, so that cells have enough space to generate new bone along the porous channel, the porous channel after the surface is plated with the hydroxyapatite film can show better osteoinductive property, and the base shows better osteoinductive property from a thin-to-thick pore structure compared with the traditional uniform pore structure.

Disclosure of Invention

The invention aims to provide a method for 3D printing of a rapid and renewable 316L stainless steel coated tooth, which solves the problems of high energy consumption, long processing time and unsmooth occlusion of the traditional tooth in processing, solves the problems of unaesthetic pure metal material and extremely brittle pure ceramic material in selecting materials, and effectively enables a person to feel that a denture is long with a gum.

The technical scheme of the invention is as follows: A3D printed rapid renewable 316L stainless steel coated tooth comprises a denture main body and a denture base.

The denture main body is formed by integrally printing and forming the doped zirconia powder and a small amount of fullerene and carbon nano tube powder. The denture main body material comprises the following chemical components in percentage by weight: fullerene: 0.1 to 0.4 percent of carbon nano tube: 0.1 to 0.6 percent and the balance of zirconium dioxide: 99 to 99.8 percent.

The denture base is formed by integrally printing 316L stainless steel powder, a small amount of fullerene and carbon nano tube powder in a fine-to-coarse stepped porous mode after doping the stainless steel powder by a 3D printer. The denture base material comprises the following chemical components in percentage by weight: fullerene: 0.1 to 0.4 percent of carbon nano tube: 0.1 to 0.6 percent of hydroxyapatite: 2% -3% and the rest is 316L stainless steel: 96% -97.8%.

A method of 3D printing a rapidly renewable 316L stainless steel coated tooth comprising the steps of:

the oral cavity of a patient is repaired, and the remained teeth, gum mucous membrane, lip cheek, frenulum, tongue, alveolar bone, jaw and temporomandibular joint are comprehensively checked.

Secondly, a laser scanning device is used for scanning teeth engaged with the false teeth in the oral cavity, three-dimensional data information of the surface morphology of the false teeth is continuously perfected, and a three-dimensional model is generated in a computer.

And then converting the three-dimensional model generated in the computer into an STL file, introducing the STL file into 3D printer control software, doping zirconium dioxide powder with a small amount of fullerene and carbon nano tube powder by using a 3D printer, and printing a compact denture main body.

And in the same way, according to the scanning result of the laser scanning device on the oral cavity, the three-dimensional data information of the tooth base attached to the gum is continuously perfected, and a three-dimensional model is generated in a computer.

And then converting the three-dimensional model generated in the computer into an STL file, introducing the STL file into 3D printer control software, doping 316L stainless steel powder with a small amount of fullerene and carbon nano tube powder on the basis of the printed denture main body by using a 3D printer, and printing the denture base in a stepped porous form from thin to thick.

The nano hydroxyapatite film is prepared by adopting a chemical vapor deposition method, the nano hydroxyapatite film with high quality is prepared, the nano hydroxyapatite film has very high and uniform nucleation density in the initial deposition stage, and the surface roughness of the 316L stainless steel base is enhanced by adopting a high-power laser treatment method to promote nucleation: firstly, manually grinding the surface of a 316L stainless steel base by using hydroxyapatite micro powder with the granularity of 0.5 mu m, then carrying out ultrasonic grinding treatment on the surface for 20min by using ethanol suspension mixed with hydroxyapatite powder with the granularity of 40 mu m, finally, washing the surface by using absolute ethanol, and putting the surface into a CVD reaction chamber after blow-drying.

And (3) introducing reaction gas (hydrogen and acetone) after vacuumizing the reaction chamber, adjusting the pressure of the reaction chamber, starting CVD (chemical vapor deposition) to deposit a hydroxyapatite coating, and depositing the hydroxyapatite coating on the surface of a die hole after 4 hours of deposition to obtain a conventional hydroxyapatite coating with the surface finish Ra of less than or equal to 0.05 mu m.

And finally, after the denture is manufactured, adjusting and polishing.

Compared with the prior art, the invention provides a method for 3D printing of rapid renewable 316L stainless steel coated teeth, which has the following beneficial effects:

1. the novel method for 3D printing of the rapid renewable 316L stainless steel coated teeth is to scan the teethridge through laser, collect three-dimensional data required by manufacturing false teeth, then manufacture the false teeth by utilizing a 3D printing technology, so that the false teeth can be manufactured rapidly, a large amount of time can be saved, the size is more standard, the accuracy of occlusion of a patient is improved, the workload of a doctor can be reduced, the working efficiency can be effectively improved, the symptoms such as gingival bleeding and black gingiva can be avoided, and the service life is extremely long.

2. After the denture is implanted into the oral cavity, the pores in the interconnected porous structure in the denture base can provide a protection area without strong fluid movement, so that cells have enough space to generate new bone along the porous channel, and the step porous structure from thin to thick and the hydroxyapatite film can quickly induce the formation of the new bone, thereby quickly promoting the combination of the denture, the gingiva and the dental bed, greatly shortening the time required for rehabilitation and ensuring that a patient wears more comfortably.

Drawings

Fig. 1 is an overall sectional view of a composite tooth, and fig. 2 is a schematic view of a porous microstructure.

In fig. 1: 1 denture base pore structure, 2 denture base coarse pore structure, 3 denture main body.

Detailed Description

The technical scheme of the present invention will be described in further detail below with reference to the specific embodiments, but the present invention is not limited thereto.

Example 1

The method for 3D printing of the rapid renewable 316L stainless steel coated teeth of the embodiment comprises the following steps:

(1) Obtaining denture size information: the method comprises the steps of performing morphology scanning on teeth engaged with a denture by using a laser scanning device, obtaining three-dimensional data information of the surface morphology of the denture, then importing the three-dimensional data information into computer three-dimensional software UG to continuously perfect the three-dimensional data information of the surface of the denture, and then converting a three-dimensional model generated in the computer into an STL file and importing the STL file into 3D printer control software.

(2) 3D printed denture body: selecting zirconium dioxide powder, doping a small amount of fullerene and carbon nanotube powder, grinding by a ball mill until the powder granularity is less than 100um, charging protective gas, heating to 900 ℃, 3D printing a denture main body by a 3D printer according to an imported three-dimensional model, performing heat treatment by adopting laser, wherein the laser power is 150W, the spot diameter is 100um, and the laser heat treatment time is 0.5s.

(3) 3D prints denture base: selecting 316L stainless steel powder, doping a small amount of fullerene and carbon nanotube powder, grinding by a ball mill until the powder granularity reaches the micron level, charging protective gas, heating to 1900 ℃, 3D printing a denture base by a 3D printer on the basis of a printed denture main body according to an imported three-dimensional model, wherein the denture base is different from the denture main body in that the denture base is of a porous structure, the pore diameter is set to be 0.5mm, carrying out heat treatment by adopting laser, the laser power is 150W, the light spot diameter is 100um, and the laser heat treatment time is 0.5s. A step of

(4) Preparing a hydroxyapatite film: firstly, manually grinding the surface of a 316L stainless steel base by using hydroxyapatite micro powder with the granularity of 0.5 mu m, then carrying out ultrasonic grinding treatment on the surface for 20min by using ethanol suspension mixed with hydroxyapatite powder with the granularity of 40 mu m, finally, washing the surface by using absolute ethanol, and putting the surface into a CVD reaction chamber after blow-drying.

(5) Depositing a hydroxyapatite coating: and (3) introducing reaction gas (hydrogen and acetone) after vacuumizing the reaction chamber, adjusting the pressure of the reaction chamber, starting CVD (chemical vapor deposition) to deposit a hydroxyapatite coating, and depositing the hydroxyapatite coating on the surface of a die hole after 4 hours of deposition to obtain a conventional hydroxyapatite coating with the surface finish Ra of less than or equal to 0.05 mu m.

(6) And (3) adjusting and polishing: and (3) adjusting and polishing the finally obtained combined teeth to obtain the 3D printing rapid renewable 316L stainless steel coated teeth.

Example 2

The method for 3D printing of the rapid renewable 316L stainless steel coated teeth of the embodiment comprises the following steps:

(1) Obtaining denture size information: the method comprises the steps of performing morphology scanning on teeth engaged with a denture by using a laser scanning device, obtaining three-dimensional data information of the surface morphology of the denture, then importing the three-dimensional data information into computer three-dimensional software UG to continuously perfect the three-dimensional data information of the surface of the denture, and then converting a three-dimensional model generated in the computer into an STL file and importing the STL file into 3D printer control software.

(2) 3D printed denture body: selecting zirconium dioxide powder, doping a small amount of fullerene and carbon nanotube powder, grinding by a ball mill until the powder granularity is less than 100um, charging protective gas, heating to 1000 ℃, 3D printing a denture main body by a 3D printer according to an imported three-dimensional model, performing heat treatment by adopting laser, wherein the laser power is 200W, the spot diameter is 150um, and the laser heat treatment time is 0.8s.

(3) 3D prints denture base: selecting 316L stainless steel powder, doping a small amount of fullerene and carbon nanotube powder, grinding by a ball mill until the powder granularity reaches the micron level, charging protective gas, heating to 1900 ℃, 3D printing a denture base by a 3D printer on the basis of a printed denture main body according to an imported three-dimensional model, wherein the denture base is different from the denture main body in that the denture base is of a porous structure, the pore diameter is set to be 0.8mm, carrying out heat treatment by adopting laser, the power of the laser is 200W, the diameter of a light spot is 150 mu m, and the heat treatment time of the laser is 0.8s.

(4) Preparing a hydroxyapatite film: firstly, manually grinding the surface of a 316L stainless steel base by using hydroxyapatite micro powder with the granularity of 0.5 mu m, then carrying out ultrasonic grinding treatment on the surface for 20min by using ethanol suspension mixed with hydroxyapatite powder with the granularity of 40 mu m, finally, washing the surface by using absolute ethanol, and putting the surface into a CVD reaction chamber after blow-drying.

(5) Depositing a hydroxyapatite coating: and (3) introducing reaction gas (hydrogen and acetone) after vacuumizing the reaction chamber, adjusting the pressure of the reaction chamber, starting CVD (chemical vapor deposition) to deposit a hydroxyapatite coating, and depositing the hydroxyapatite coating on the surface of a die hole after 4 hours of deposition to obtain a conventional hydroxyapatite coating with the surface finish Ra of less than or equal to 0.05 mu m.

(6) And (3) adjusting and polishing: and (3) adjusting and polishing the finally obtained combined teeth to obtain the 3D printing rapid renewable 316L stainless steel coated teeth.

Example 3

The method for 3D printing of the rapid renewable 316L stainless steel coated teeth of the embodiment comprises the following steps:

(1) Obtaining denture size information: the method comprises the steps of performing morphology scanning on teeth engaged with a denture by using a laser scanning device, obtaining three-dimensional data information of the surface morphology of the denture, then importing the three-dimensional data information into computer three-dimensional software UG to continuously perfect the three-dimensional data information of the surface of the denture, and then converting a three-dimensional model generated in the computer into an STL file and importing the STL file into 3D printer control software.

(2) 3D printed denture body: selecting zirconium dioxide powder, doping a small amount of fullerene and carbon nanotube powder, grinding by a ball mill until the powder granularity is less than 100um, charging protective gas, heating to 1100 ℃, 3D printing a denture main body by a 3D printer according to an imported three-dimensional model, performing heat treatment by adopting laser, wherein the laser power is 250W, the spot diameter is 200um, and the laser heat treatment time is 1s.

(3) 3D prints denture base: selecting 316L stainless steel powder, doping a small amount of fullerene and carbon nanotube powder, grinding by a ball mill until the powder granularity reaches the micron level, charging protective gas, heating to 1900 ℃, 3D printing a denture base by a 3D printer on the basis of a printed denture main body according to an imported three-dimensional model, wherein the denture base is different from the denture main body in that the denture base is of a porous structure, the pore diameter is set to be 1.2mm, carrying out heat treatment by adopting laser, the laser power is 250W, the light spot diameter is 200 mu m, and the laser heat treatment time is 1s.

(4) Preparing a hydroxyapatite film: firstly, manually grinding the surface of a 316L stainless steel base by using hydroxyapatite micro powder with the granularity of 0.5 mu m, then carrying out ultrasonic grinding treatment on the surface for 20min by using ethanol suspension mixed with hydroxyapatite powder with the granularity of 40 mu m, finally, washing the surface by using absolute ethanol, and putting the surface into a CVD reaction chamber after blow-drying.

(5) Depositing a hydroxyapatite coating: and (3) introducing reaction gas (hydrogen and acetone) after vacuumizing the reaction chamber, adjusting the pressure of the reaction chamber, starting CVD (chemical vapor deposition) to deposit a hydroxyapatite coating, and depositing the hydroxyapatite coating on the surface of a die hole after 4 hours of deposition to obtain a conventional hydroxyapatite coating with the surface finish Ra of less than or equal to 0.05 mu m.

(6) And (3) adjusting and polishing: and (3) adjusting and polishing the finally obtained combined teeth to obtain the 3D printing rapid renewable 316L stainless steel coated teeth.

The foregoing description of the preferred embodiments of the invention is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (1)

1. A method for 3D printing of a rapid renewable 316L stainless steel coated tooth is characterized in that a 3D printing pore is formed by a thin-to-thick coated combined tooth, and the combined tooth comprises a denture main body and a denture base; the combined tooth and preparation process comprises the following steps:

(1) Obtaining denture size information: the method comprises the steps of performing morphology scanning on teeth engaged with a false tooth by using a laser scanning device, obtaining three-dimensional data information of the surface morphology of the false tooth, then importing the three-dimensional data information into computer three-dimensional software UG to continuously perfect the three-dimensional data information of the surface of the false tooth, and then converting a three-dimensional model generated in the computer into an STL file to be imported into 3D printer control software;

(2) 3D printed denture body: the denture main body material comprises the following chemical components in percentage by weight: fullerene: 0.1 to 0.4 percent of carbon nano tube: 0.1 to 0.6 percent and the balance of zirconium dioxide: 99 to 99.8 percent, selecting zirconium dioxide powder, doping a small amount of fullerene and carbon nano tube powder, grinding the powder to a powder granularity smaller than 100um by a ball mill, filling protective gas, heating to 900 to 1200 ℃, 3D printing a denture main body by a 3D printer according to an imported three-dimensional model, performing heat treatment by adopting laser, wherein the power of the laser is 150 to 250W, the diameter of a light spot is 100 to 200um, and the heat treatment time of the laser is 0.5 to 1s;

(3) 3D prints denture base: the denture base material comprises the following chemical components in percentage by weight: fullerene: 0.1 to 0.4 percent of carbon nano tube: 0.1 to 0.6 percent of hydroxyapatite: 2% -3% and the rest is 316L stainless steel: 96% -97.8%, selecting 316L stainless steel powder, doping with a small amount of fullerene and carbon nano tube powder, grinding by a ball mill until the powder granularity reaches micron level, charging protective gas, heating to 1900-1950 ℃, 3D printing a denture base by a 3D printer on the basis of a printed denture main body according to an imported three-dimensional model, wherein the denture base is different from the denture main body in that the denture base is of a porous structure, the pore diameter is set to be 0.3-1.5 mm, the heat treatment is carried out by adopting laser, the power of the laser is 150-250W, the diameter of a light spot is 100-200 mu m, and the heat treatment time of the laser is 0.5-1 s;

(4) Preparing a hydroxyapatite film: firstly, manually grinding the surface of a 316L stainless steel base by using hydroxyapatite micro powder with the granularity of 0.5 mu m, then carrying out ultrasonic grinding treatment on the surface for 20min by using ethanol suspension mixed with hydroxyapatite powder with the granularity of 40 mu m, finally, washing the surface by using absolute ethanol, and putting the surface into a CVD reaction chamber after blow-drying;

(5) Depositing a hydroxyapatite coating: introducing reaction gas (hydrogen and acetone) after vacuumizing a reaction chamber, adjusting the pressure of the reaction chamber, starting CVD (chemical vapor deposition) to deposit a hydroxyapatite coating, and depositing the hydroxyapatite coating on the surface of a die hole after 4 hours of deposition to obtain a conventional hydroxyapatite coating with about 8 mu m, wherein the surface finish Ra is less than or equal to 0.05 mu m;

(6) And (3) adjusting and polishing: and (3) adjusting and polishing the finally obtained combined teeth to obtain the 3D printing rapid renewable 316L stainless steel coated teeth.

Images