CN114177093B - Denture base material and preparation method thereof - Google Patents
Denture base material and preparation method thereof Download PDFInfo
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- CN114177093B CN114177093B CN202111530175.XA CN202111530175A CN114177093B CN 114177093 B CN114177093 B CN 114177093B CN 202111530175 A CN202111530175 A CN 202111530175A CN 114177093 B CN114177093 B CN 114177093B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
- A61K6/887—Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/60—Preparations for dentistry comprising organic or organo-metallic additives
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/70—Preparations for dentistry comprising inorganic additives
- A61K6/71—Fillers
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Abstract
The invention provides a denture base material and a preparation method thereof, comprising the following steps: the carbon fiber reinforced polymethyl methacrylate substrate is coated with a hydrophilic layer on the surface; the hydrophilic layer is polymethyl methacrylate doped with sericin powder; the surface of the carbon fiber reinforced polymethyl methacrylate substrate is provided with a plurality of protruding carbon fiber ends, and the protruding carbon fiber ends are coated by the hydrophilic layer. The denture base material provided by the invention can simultaneously improve the mechanical property and the hydrophilic property of the material.
Description
Technical Field
The invention relates to the technical field of denture base preparation, in particular to a denture base material and a preparation method.
Background
The dentition deficiency refers to the fact that the whole dental arch is free of any natural teeth or tooth roots, and the denture manufactured for the patient with the dentition deficiency is called complete denture. Complete dentures exert their effects in the oral cavity sufficiently, and the retention and stabilization of dentures are very important. The retention and stabilization of denture materials are not only related to the physical properties of the materials, the chewing function of the patient, psychophysiological factors and mechanical factors, but also are closely related to the hydrophilicity of the denture base material.
The thermosetting resin base used clinically at present has poor surface hydrophilicity, which leads to poor retention and easy attachment of fungi. And also the mechanical properties are poor, resulting in a shorter service life.
Disclosure of Invention
In order to solve the above-mentioned shortcomings of the prior art, the present invention provides a denture base material, a preparation method, a system, a terminal and a storage medium, so as to solve the above-mentioned technical problems.
In a first aspect, the present invention provides a denture base material comprising:
the carbon fiber reinforced polymethyl methacrylate substrate is coated with a hydrophilic layer on the surface; the hydrophilic layer is polymethyl methacrylate doped with sericin powder; the surface of the carbon fiber reinforced polymethyl methacrylate substrate is provided with a plurality of protruding carbon fiber ends, and the protruding carbon fiber ends are coated by the hydrophilic layer.
Further, the carbon fiber length of the carbon fiber reinforced polymethyl methacrylate substrate is 2mm-5mm.
Further, the carbon fiber length is 3mm.
Further, the carbon fiber content of the carbon fiber reinforced polymethyl methacrylate substrate is 5% -9%.
Further, the thickness of the hydrophilic layer is 1mm-3mm.
In a second aspect, the present invention provides a method of preparing a denture base material comprising:
placing a substrate mixture obtained by fully mixing methyl methacrylate copolymer powder, methyl methacrylate monomer, an initiator and carbon fiber into a substrate mold; placing the substrate die in a curing environment, performing primary curing on the substrate mixture in the substrate die at the curing temperature, and polishing the surface of the cured substrate mixture to expose the convex carbon fiber ends on the surface of the cured substrate mixture to obtain a carbon fiber reinforced polymethyl methacrylate substrate;
taking methyl methacrylate copolymer powder, methyl methacrylate monomer, initiator and sericin powder, fully mixing to obtain a mixture, coating the mixture on the surface of a carbon fiber reinforced polymethyl methacrylate substrate, and placing the carbon fiber reinforced polymethyl methacrylate substrate coated with the mixture into a finished product die; and (3) putting the finished product die into a curing environment, and performing secondary curing on the mixed material layer coated on the surface of the carbon fiber reinforced polymethyl methacrylate substrate at the curing temperature to obtain the denture base material.
Further, the average molecular weight of the methyl methacrylate copolymer powder was 5.0X10 5 The average grain diameter is 25-45 μm; the average molecular weight of the methyl methacrylate monomer was 100.12; the initiator is benzoyl peroxide.
Furthermore, the solidification environment adopts a constant temperature water tank, the temperature of the constant temperature water tank is raised to 70 ℃ and kept for 90min after the constant temperature water tank is put into a die, and the die is a base material die or a finished product die.
Further, a telescopic supporting bulge is arranged in the finished product die, after the carbon fiber reinforced polymethyl methacrylate substrate coated with the mixture is put into the finished product die, the supporting bulge is ejected out, and the supporting bulge is made to support the carbon fiber reinforced polymethyl methacrylate substrate, so that the bottom of the carbon fiber reinforced polymethyl methacrylate substrate does not extrude the mixture layer.
Further, the solid-to-liquid ratio of the methyl methacrylate copolymer powder and the methyl methacrylate monomer of the base material mixture and the coating mixture is 2.0; the content of carbon fiber in the base material mixture is 5-9%; the sericin powder content of the mixture for coating is 1-5%.
The denture base material and the preparation method have the beneficial effects that the denture base material provided by the invention adopts a double-layer structure, the inner base material adopts the core mechanical property of the carbon fiber reinforced material, the surface of the base material is coated with the hydrophilic layer to enhance the surface hydrophilicity of the denture base, the base materials of the inner base material and the hydrophilic layer are polymethyl methacrylate, and the carbon fiber protruding part of the inner base material can be used for penetrating into the hydrophilic layer, so that the combination degree of the inner base material and the hydrophilic layer is greatly enhanced. The denture base material provided by the invention can simultaneously improve the mechanical property and the hydrophilic property of the material.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic view of a denture base material according to one embodiment of the present invention.
Wherein, 1, a base material; 2. a hydrophilic layer; 3. carbon fiber.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
Specifically, referring to fig. 1, the denture base material provided by the present invention includes:
a hydrophilic layer 2 is coated on the surface of the carbon fiber reinforced polymethyl methacrylate substrate 1; the hydrophilic layer 2 is polymethyl methacrylate doped with sericin powder. Wherein the length of the carbon fiber 3 is 3mm, and the content of the carbon fiber 3 of the carbon fiber reinforced polymethyl methacrylate substrate 1 is 6 percent (weight ratio). The hydrophilic layer 2 had a thickness of 1mm, and the sericin powder content in the hydrophilic layer 2 was 3% by weight.
The preparation method of the denture base material comprises the following steps:
methyl methacrylate copolymer powder D-300 (average molecular weight 5.0X10 5 Average particle diameter 25-45 μm), methyl methacrylate monomer MMA (average molecular weight 100.12), initiator (benzoyl peroxide) andcarbon fiber (length 3 mm), wherein the solid-to-liquid ratio of the methyl methacrylate copolymer powder to the methyl methacrylate monomer is 2.0, and the carbon fiber content is 6%. The above materials were mixed by a spin mixer at 2000rpm for 60 seconds, and poured into a base material mold (stainless steel groove). The specific method for injecting the substrate mold comprises the following steps: the separating agent is smeared on the cavity wall of the base material mould, the materials are filled, the polyester film belt is covered up and down after filling, then the metal sheet is covered, and the pressure is carried out by a press machine.
And (3) placing the substrate die into a constant-temperature water tank, heating the water temperature of the constant-temperature water tank to 70 ℃, placing the substrate die into the die for boiling for 30 minutes, and heating and polymerizing for 60 minutes after boiling. And naturally cooling the polymerized stainless steel casting mould in a water tank for 24 hours, and taking out to obtain the base material. The carbon fiber was sequentially ground with a horizontal grinder under running water using grinding paper No.240, no.600, and since the strength of the carbon fiber was much higher than that of polymethyl methacrylate, polymethyl methacrylate was ground and a layer of carbon fiber was partially exposed. The thickness of the grinding off cannot exceed 1mm during grinding. The exposed carbon fiber end is coated by the hydrophilic layer which is cured for the second time, and the carbon fiber is inserted between the base material and the hydrophilic layer, so that the bonding strength of the bonding interface of the base material and the hydrophilic layer is enhanced, and the hydrophilic layer is prevented from being peeled off from the bonding interface due to long-term fatigue stress.
Then, methyl methacrylate copolymer powder D-300 (average molecular weight 5.0X10 5 An average particle diameter of 25-45 μm), methyl methacrylate monomer MMA (average molecular weight of 100.12), an initiator (benzoyl peroxide) and sericin powder (average molecular weight of 4.0X10), wherein the solid-to-liquid ratio of the methyl methacrylate copolymer powder to the methyl methacrylate monomer is 2.0, and the sericin powder content is 3%. The above raw materials are mixed by a autorotation stirrer at a rotation speed of 2000rpm for 60 seconds and then smeared on the surface of a base material, and the smearing thickness is controlled in the smearing process, and in this embodiment, the thickness is controlled to be about 1mm and the raw materials are injected into a finished product mold (a stainless steel groove slightly larger than the base material mold, and telescopic probes are respectively arranged at two ends of the finished product mold). The specific method for injecting the finished mold comprises the following steps: the cavity wall of the finished mold and the probe are smeared with separating agent, the materials are filled, the probe is ejected after filling, and the probe contacts the substrate to support the substrateAnd the function of preventing the substrate from pressing the hydrophilic layer under the action of gravity to deform the hydrophilic layer. Then, a polyester film tape was covered up and down, and then a metal sheet was covered, and pressurization was performed by a press machine.
And (3) putting the finished die into a constant-temperature water tank, heating the water temperature of the constant-temperature water tank to 70 ℃, putting the die into the constant-temperature water tank for boiling for 30 minutes, and heating and polymerizing for 60 minutes after boiling. The polymerized stainless steel casting mold is naturally cooled in a water tank for 24 hours, then taken out, and is sequentially ground by a horizontal grinder under running water by grinding paper No.240, no.600, no.1000 and No.1200 to obtain the denture base material 1.
Example 2
In this example, compared with example 1, 3mm carbon fiber was replaced with 5mm carbon fiber, the carbon fiber content was adjusted to 9%, and the sericin powder content was adjusted to 5%. Denture base material 2 was prepared as in example 1.
Example 3
In this example, compared with example 1, 3mm carbon fiber was replaced with 2mm carbon fiber, the carbon fiber content was adjusted to 5%, and the sericin powder content was adjusted to 1%. When the hydrophilic layer mixture is coated, the thickness is controlled to be 3mm. Denture base material 3 was prepared as in example 1.
Comparative example 1
Methyl methacrylate copolymer powder D-300 (average molecular weight 5.0X10 5 Average particle diameter 25-45 μm), methyl methacrylate monomer MMA (average molecular weight 100.12), and initiator (benzoyl peroxide), wherein the solid-liquid ratio of methyl methacrylate copolymer powder to methyl methacrylate monomer is 2.0. The above materials were mixed by a spin mixer at 2000rpm for 60 seconds, and poured into a final mold (probe retraction). The specific method for injecting the finished mold comprises the following steps: and (3) smearing a separating agent on the cavity wall of the finished die, filling the materials, covering a polyester film belt up and down after filling, covering a metal sheet, and pressurizing by a press machine. And (3) putting the finished die into a constant-temperature water tank, heating the water temperature of the constant-temperature water tank to 70 ℃, putting the die into the constant-temperature water tank for boiling for 30 minutes, and heating and polymerizing for 60 minutes after boiling. Naturally cooling the polymerized stainless steel casting mould in a water tank for 24 hoursAnd then taken out to obtain the denture base material 4.
The denture base materials 1-4 were subjected to mechanical property testing and hydrophilicity testing:
mechanical characteristic analysis of the test piece: after each test piece is periodically soaked in a constant temperature drying oven 0d,14d, 30d,90d,180d and 360d, the test piece is placed on a universal mechanical testing machine, three-point bending test is carried out according to ISO20795-1, the span is 20mm, the loading speed is 0.5mm/min, the radius of an upper pressing head is 2mm, the maximum load during fracture is recorded, and the bending strength (sigma) =3FmLo// 2WB2 and the bending elastic modulus (E) =FL o 3/4δWB2 are calculated according to the following formula. [ wherein, the load value (N) at the time of F m sample fracture, the load value (N) at the time of F ratio limit, the deformation amount (mm) at the time of delta ratio limit, the distance (mm) between L o two fulcrums, the W sample width (mm), the B sample thickness (mm) ].
Preservation of each sample: soaking in 100 ml distilled water at the temperature of (37+/-1) ℃ for 16 hours, and soaking in 100 ml distilled water at the temperature of (23+/-1) ℃ for 8 hours in a periodic cycle manner in a constant-temperature drying oven for 0d,14d, 30d,90d,180d and 360d. Analysis of surface characteristics of test pieces: after each test piece was periodically immersed in the constant temperature dry boxes 0d,14d, 30d,90d,180d,360d, the contact angle at intervals was measured by a portable full-automatic contact angle measuring instrument. The contact angle was measured at a temperature of (23.+ -. 1) ℃by dropping distilled water for 2 seconds by the dropping method.
The experimental results of the above test are shown in table 1:
| modulus of elasticity | Contact angle | |
| Denture base 1 | 5036.15 | 60.4 |
| |
3689.35 | 78.9 |
| |
3526.14 | 80.77 |
| Denture base 4 | 2948.37 | 87.1 |
Table 1 experimental results
From the above experimental results, the elastic modulus and the contact angle of the denture base 1 were all the best.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A denture base material, comprising:
the carbon fiber reinforced polymethyl methacrylate substrate is coated with a hydrophilic layer on the surface; the hydrophilic layer is polymethyl methacrylate doped with sericin powder; a plurality of protruding carbon fiber ends exist on the surface of the carbon fiber reinforced polymethyl methacrylate substrate, and the protruding carbon fiber ends are coated by the hydrophilic layer;
the length of the carbon fiber reinforced polymethyl methacrylate substrate is 2mm-5mm;
the weight percentage of the carbon fiber reinforced polymethyl methacrylate substrate is 5-9%;
the thickness of the hydrophilic layer is 1mm-3mm;
the weight percentage of sericin powder in the hydrophilic layer is 1% -5%.
2. The denture base material according to claim 1, wherein the carbon fiber length is 3mm.
3. A method of preparing a denture base material according to claim 1 or claim 2, comprising:
placing a substrate mixture obtained by fully mixing methyl methacrylate copolymer powder, methyl methacrylate monomer, an initiator and carbon fiber into a substrate mold; placing the substrate die in a curing environment, performing primary curing on the substrate mixture in the substrate die at the curing temperature, and polishing the surface of the cured substrate mixture to expose the convex carbon fiber ends on the surface of the cured substrate mixture to obtain a carbon fiber reinforced polymethyl methacrylate substrate;
taking methyl methacrylate copolymer powder, methyl methacrylate monomer, initiator and sericin powder, fully mixing to obtain a mixture, coating the mixture on the surface of a carbon fiber reinforced polymethyl methacrylate substrate, and placing the carbon fiber reinforced polymethyl methacrylate substrate coated with the mixture into a finished product die; and (3) putting the finished product die into a curing environment, and performing secondary curing on the mixed material layer coated on the surface of the carbon fiber reinforced polymethyl methacrylate substrate at the curing temperature to obtain the denture base material.
4. The method according to claim 3, wherein the average molecular weight of the methyl methacrylate copolymer powder is 5.0X10 5 Average particle diameter25-45 μm; the average molecular weight of the methyl methacrylate monomer was 100.12; the initiator is benzoyl peroxide.
5. A method according to claim 3, wherein the solidification environment is a constant temperature water tank, and the temperature of the constant temperature water tank is raised to 70 ℃ and maintained for 90 minutes after the constant temperature water tank is placed in a mold, and the mold is a substrate mold or a finished mold.
6. A method according to claim 3, wherein the finished mold is provided with a telescopic supporting protrusion, and the supporting protrusion is ejected after the carbon fiber reinforced polymethyl methacrylate substrate coated with the mixture is put into the finished mold, so that the supporting protrusion supports the carbon fiber reinforced polymethyl methacrylate substrate, and the bottom of the carbon fiber reinforced polymethyl methacrylate substrate does not press the mixture layer.
7. The method according to claim 3, wherein the solid-to-liquid ratio of the methyl methacrylate copolymer powder and the methyl methacrylate monomer of the base material mixture and the coating mixture is 2.0; the content of the carbon fiber in the base material mixture is 5-9%.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000005049A1 (en) * | 1998-07-22 | 2000-02-03 | Koichi Okano | Fiber-reinforced plastic and denture base made therefrom |
| JP3041483B1 (en) * | 1999-02-22 | 2000-05-15 | 亀水化学工業株式会社 | Denture base composition and method for producing denture base using the composition |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000005049A1 (en) * | 1998-07-22 | 2000-02-03 | Koichi Okano | Fiber-reinforced plastic and denture base made therefrom |
| JP3041483B1 (en) * | 1999-02-22 | 2000-05-15 | 亀水化学工業株式会社 | Denture base composition and method for producing denture base using the composition |
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