CN113499270B - Denture base resin and preparation method thereof - Google Patents
Denture base resin and preparation method thereof Download PDFInfo
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- CN113499270B CN113499270B CN202110786979.XA CN202110786979A CN113499270B CN 113499270 B CN113499270 B CN 113499270B CN 202110786979 A CN202110786979 A CN 202110786979A CN 113499270 B CN113499270 B CN 113499270B
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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
- A61K6/70—Preparations for dentistry comprising inorganic additives
- A61K6/71—Fillers
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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
- A61K6/76—Fillers comprising silicon-containing compounds
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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
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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
- A61K6/831—Preparations for artificial teeth, for filling teeth or for capping teeth comprising non-metallic elements or compounds thereof, e.g. carbon
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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
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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
- A61K6/898—Polysaccharides
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Abstract
The application relates to the technical field of denture production, and particularly discloses denture base resin and a preparation method thereof, wherein the denture base resin comprises the following raw materials in parts by weight: 90-110 parts of thermosetting denture powder, 80-100 parts of methyl methacrylate, 0.3-0.5 part of benzoyl peroxide, 0.1-0.4 part of o-dimethyl dibutyl phthalate, 2-4 parts of pigment, 0.8-2 parts of anti-cracking agent and 0.5-1 part of halloysite powder; the anti-cracking agent comprises at least one of lignin fiber and glass fiber; the preparation method comprises the following steps: mixing methyl methacrylate, o-phthalic dibutyl ester, benzoyl peroxide, pigment, an anti-cracking agent and halloysite powder, and uniformly mixing to obtain denture fixing water; mixing denture base water and thermosetting denture base powder at 30-50 ℃, uniformly mixing, and standing to a dough period to obtain denture base resin; the denture base resin in the application has the advantage of good crack resistance.
Description
Technical Field
The application relates to the technical field of denture production, in particular to denture base resin and a preparation method thereof.
Background
The denture is a conventional denture, and is required to be worn after the dentition is defective or missing so as to restore the normal chewing function, and consists of two parts, namely an artificial tooth and a base, wherein the base connects the artificial tooth together and uniformly transmits the chewing force born by the artificial tooth to an alveolar ridge; the main material of the current base is denture base resin.
The denture base resin is mainly divided into a thermosetting type, a self-setting type, a photocuring type and a thermoplastic injection type according to a curing mode, wherein the thermosetting type denture base resin is a better base material at present, mainly comprises denture powder methyl methacrylate homopolymer or copolymer, denture water methyl methacrylate, pigment, initiator and other substances, and has good technological properties.
Through the related technology, the denture base resin is sensitive to repeated load, so that the denture base resin is easy to break, and the normal use of the denture is influenced.
Disclosure of Invention
In order to enhance the crack resistance of the denture base resin, the application provides the denture base resin and a preparation method thereof.
In a first aspect, the present application provides a denture base resin, which employs the following technical solution:
the denture base resin comprises the following raw materials in parts by weight:
90-110 parts of thermosetting denture powder;
80-100 parts of methyl methacrylate;
0.3-0.5 part of benzoyl peroxide;
0.1-0.4 part of o-dimethyl dibutyl ester;
2-4 parts of pigment;
0.8-2 parts of anti-cracking agent;
0.5-1 part of halloysite powder;
the anti-cracking agent comprises at least one of lignin fiber and glass fiber.
By adopting the technical scheme, the thermosetting denture powder and the methyl methacrylate are mixed, and added substances such as an anti-cracking agent, halloysite powder and the like are added to obtain the denture base resin with better anti-cracking performance; one or two of lignin fiber and glass fiber are preferably selected as anti-cracking agents and matched with halloysite powder, so that the bonding effect among the raw materials is improved, and meanwhile, the hardness of the denture base resin is improved through a pore structure; in addition, the fiber crystals can be stretched in the pores, so that the toughness of the denture base resin is enhanced, and the crack resistance of the denture base resin is further enhanced.
Preferably, the thermosetting denture powder is copolymerized powder of methyl methacrylate.
By adopting the technical scheme, the copolymerization of methyl methacrylate, esters and other substances is preferably carried out, and the formed methyl methacrylate copolymer powder is matched with the methyl methacrylate, the anti-cracking agent and the halloysite powder together, so that the denture base resin has better anti-cracking performance and toughness, and the service life of the denture is further prolonged.
Preferably, the thermosetting denture powder is prepared by the following steps:
a1, mixing 60-80 parts by weight of methyl methacrylate and 0.2-0.5 part by weight of initiator, uniformly mixing, and heating at 75-90 ℃ for 20-40min to obtain prepolymerized methyl methacrylate;
and A2, mixing the pre-polymerized methyl methacrylate in the step A1 with 30-40 parts by weight of styrene butadiene rubber, uniformly mixing, polymerizing at the polymerization temperature of 80-90 ℃ for 3-6 hours, filtering, washing and drying to obtain the thermosetting denture powder.
According to the technical scheme, methyl methacrylate and an initiator are mixed to obtain uniformly mixed pre-polymerized methyl methacrylate, so that the pre-polymerized methyl methacrylate is better copolymerized with styrene butadiene rubber with better flexibility, the polymerization temperature and time are controlled, the conversion rate is improved, more thermosetting denture powder is obtained, and meanwhile, the thermosetting denture powder, the methyl methacrylate, the anti-cracking agent and the halloysite powder are cooperatively matched with each other, so that the toughness and the anti-cracking performance of the denture base resin are further enhanced.
Preferably, 0.4 to 0.5 weight part of toughening agent is added after polymerization in the step A2, and the mixture is uniformly mixed and then is kept warm for 1 to 3 hours.
By adopting the technical scheme, the toughening agent is added after polymerization, and heat preservation is carried out, so that the toughening agent and the styrene butadiene rubber are combined together, the toughness of the thermosetting denture powder is enhanced, and the toughness of the denture base resin is further enhanced.
Preferably, the toughening agent consists of nano magnesium oxide and nano silicon dioxide, and the weight ratio of the nano magnesium oxide to the nano silicon dioxide is 1 (1-1.5).
By adopting the technical scheme, the nano-magnesia and the nano-silica are preferably selected as the toughening agent to be matched with the styrene butadiene rubber together to be mixed with the methyl methacrylate, so that the bonding effect is improved, the copolymerization conversion efficiency is improved, the toughness of the thermosetting denture powder is enhanced, and the crack resistance of the denture base resin is further enhanced.
Preferably, the raw material of the denture base resin also comprises 0.5-0.9 part by weight of additive, and the additive comprises at least one of rice hull powder and bamboo powder.
By adopting the technical scheme, one or two of the rice hull powder and the bamboo powder are added as additives, and the fiber components of the two are matched with the anti-cracking agent and the halloysite powder, so that the internal stability of the denture base resin system is enhanced through the interface combination effect, and the anti-cracking performance and the toughness of the denture base resin are further enhanced.
Preferably, the additive consists of rice hull powder and bamboo powder, and the weight ratio of the rice hull powder to the bamboo powder is 1 (1-2).
By adopting the technical scheme, the additive consisting of the rice hull powder and the bamboo powder is preferably selected, and the weight ratio of the rice hull powder to the bamboo powder is controlled, so that the additive is matched with the anti-cracking agent and the halloysite powder, and the anti-cracking performance and the toughness of the denture base resin are further enhanced.
In a second aspect, the present application provides a method for preparing a denture base resin, which adopts the following technical scheme:
a preparation method of denture base resin comprises the following steps:
s1, mixing methyl methacrylate, o-phthalic dimethyl dibutyl ester, benzoyl peroxide, a pigment, an anti-cracking agent and halloysite powder uniformly to obtain denture fixing water;
and S2, mixing denture base water and thermosetting denture base powder at the temperature of 30-50 ℃, uniformly mixing, and standing to a dough period to obtain the denture base resin.
By adopting the technical scheme, the raw materials are uniformly mixed to obtain the denture base water, and the denture base water and the thermosetting denture base powder are uniformly mixed until the denture base resin is properly filled.
Preferably, in the step S1, additives are added together and mixed together.
By adopting the technical scheme, the denture base resin with better crack resistance and toughness is obtained by adding the additive, combining with the crack resistance agent and the halloysite powder together.
Preferably, the stirring speed in the step S2 is 50-70r/min.
By adopting the technical scheme, the stirring speed is too low, the time cost is higher, and the efficiency is lower; the stirring speed is too high, the mixing effect of all raw materials is easily damaged, the stirring speed is controlled to be 50-70r/min, the efficiency is improved, and the denture base resin with uniform crack resistance is obtained.
In summary, the present application has the following beneficial effects:
1. because the anti-cracking agent and the halloysite powder are added into the raw materials of the denture base resin, the denture base resin is endowed with better anti-cracking performance and toughness; the anti-cracking agent is preferably one or two of lignin fiber and glass fiber, and acts with halloysite powder, so that the toughness of the denture base resin is improved through a pore structure, and the anti-cracking performance of the denture base resin is further enhanced.
2. In the present application, a copolymer of methyl methacrylate and styrene-butadiene rubber is preferably used to enhance the toughness and crack resistance of the denture base resin; meanwhile, the preparation method is optimized, and the toughening agent consisting of nano magnesium oxide and nano silicon dioxide is added, so that the copolymerization conversion efficiency is improved, and the crack resistance of the denture base resin is further enhanced.
3. In the application, the additive consisting of rice hull powder and bamboo powder is added into the raw material of the denture base resin, so that the internal stability of the denture base resin is enhanced, and the crack resistance and toughness of the denture base resin are further enhanced; the preparation method of the denture base is optimized, and the stirring speed in the mixing step is controlled, so that the denture base resin with uniform crack resistance is obtained.
Detailed Description
The present application is described in further detail below.
The components and manufacturers in the examples are shown in Table 1.
TABLE 1 Components and manufacturers
Preparation example
Preparation example 1A thermosetting denture powder, comprising the specific components and weights shown in Table 2, was prepared by the following steps: mixing and stirring methyl methacrylate, an initiator di-tert-butyl peroxide and styrene butadiene rubber at the stirring speed of 50r/min, uniformly stirring, polymerizing at the polymerization temperature of 80 ℃ for 6h, filtering by using a 60-mesh filter screen, washing by using water for 30min, and drying at the temperature of 60 ℃ for 20h to obtain the thermosetting denture powder.
Preparation example 2A thermosetting denture powder was prepared, which was different from preparation example 1 in the weight of the included specific components, and the included specific components and the weight were as shown in Table 2.
Preparation example 3A thermosetting denture powder, which is different from preparation example 1 in the preparation steps, comprises the following steps:
a1, mixing and stirring methyl methacrylate and an initiator di-tert-butyl peroxide at a stirring speed of 50r/min, uniformly stirring, and heating at 75 ℃ for 40min to obtain prepolymerized methyl methacrylate;
and A2, mixing and stirring the pre-polymerized methyl methacrylate and the styrene butadiene rubber in the step A1 at a stirring speed of 50r/min, uniformly stirring, polymerizing at a polymerization temperature of 80 ℃ for 6 hours, filtering by using a 60-mesh filter screen, washing by using water for 30 minutes, and drying at 60 ℃ for 20 hours to obtain the thermosetting denture powder.
Preparation examples 4 to 5A thermosetting denture powder, which is different from preparation example 3 in that in step A2, a toughening agent is added after polymerization and stirred, the temperature is kept for 1h after uniform stirring, and the specific components and the weight are shown in Table 2.
Preparation examples 6 to 7A thermosetting denture powder was different from preparation example 5 in the specific components and weights of the toughening agent, and the specific components and weights included were as shown in Table 2.
Preparation examples 8 to 9A thermosetting denture powder, which is different from preparation example 3 in that it comprises the following specific components by weight:
a1, mixing and stirring methyl methacrylate and an initiator di-tert-butyl peroxide at a stirring speed of 50r/min, heating at 90 ℃ for 20min after uniformly stirring to obtain prepolymerized methyl methacrylate;
and A2, stirring the prepolymerized methyl methacrylate and the styrene-butadiene rubber in the step A1 at a stirring speed of 50r/min, uniformly stirring and polymerizing at a polymerization temperature of 90 ℃ for 3h, adding a toughening agent after polymerization, continuously stirring uniformly, keeping the temperature for 1h, filtering by using a 60-mesh filter screen, washing by using water for 30min, and drying at 60 ℃ for 20h to obtain the thermosetting denture powder.
TABLE 2 specific compositions and weights of preparation examples 1-9
Examples
Example 1:
a denture base resin comprising the specific components and weights shown in Table 3, was prepared by the following steps:
s1, mixing and stirring methyl methacrylate, benzoyl peroxide, o-dimethyl dibutyl phthalate, a pigment cadmium red, an anti-cracking agent and halloysite powder at a stirring speed of 80r/min to obtain denture base water after uniformly stirring;
and S2, mixing denture base water and a commercially available homopolymer (shown in table 1) at 30 ℃, stirring at the speed of 40r/min, uniformly stirring, and standing until the dough period to obtain the denture base resin.
Example 2 a denture base resin was different from example 1 in specific components and weights, and included specific components and weights are shown in table 3.
Example 3 a denture base resin, different from example 1, was prepared using a thermosetting denture powder as preparation example 1, comprising the specific components and weights as shown in table 3.
Examples 4 to 11 a denture base resin, different from example 3 in the kind of thermosetting denture base powder used, the thermosetting denture base powder corresponded to preparation examples 2 to 9, respectively, and 90g of each of preparation examples 2 to 9, and the specific components and weights included therein were as shown in table 3.
Examples 12 to 13 a denture base resin, which is different from example 1 in that additives were added in step S1, and the specific components and weights included are shown in table 3.
Examples 14-15A denture base resin was distinguished from example 13 in that the additives were different in specific components and weights, and included as shown in Table 3.
Example 16: a denture base resin was distinguished from example 1 in that the stirring speed in step S2 was 50r/min.
Example 17: a denture base resin was distinguished from example 1 in that the stirring speed in step S2 was 70r/min.
Example 18 a denture base resin, different from example 1 in that it comprises the following specific components and weights as shown in table 3, comprises the steps of:
s1, mixing and stirring methyl methacrylate, benzoyl peroxide, o-dimethyl dibutyl phthalate, a pigment cadmium red, an anti-cracking agent, halloysite powder and an additive at a stirring speed of 80r/min to obtain denture water after uniformly stirring;
and S2, mixing denture base water and the preparation example 9 at 30 ℃, stirring at the speed of 50r/min, uniformly stirring, and standing to a dough period to obtain the denture base resin.
Example 19 a denture base resin, different from example 18 in that it comprises the specific components and weights shown in table 3, comprising the steps of:
s1, mixing and stirring methyl methacrylate, benzoyl peroxide, o-dimethyl dibutyl phthalate, a pigment cadmium red, an anti-cracking agent, halloysite powder and an additive at a stirring speed of 80r/min to obtain denture water after uniformly stirring;
and S2, mixing denture base water and the preparation example 9 at 50 ℃, stirring at the speed of 70r/min, uniformly stirring, and standing to a dough period to obtain the denture base resin.
TABLE 3 specific compositions and weights for examples 1-3, examples 12-15, and examples 18-19
Comparative example
Comparative example 1 a denture base resin, different from example 1, did not contain lignin fiber.
Comparative example 2 a denture base resin, different from example 1, did not contain glass fiber.
Comparative example 3 a denture base resin, different from example 1, did not contain an anti-crack agent.
Comparative example 4 a denture base resin, different from example 1, did not contain halloysite powder.
Comparative example 5 a denture base resin, different from example 1, did not contain halloysite powder and an anti-cracking agent.
Comparative example 6 a denture base resin consisting of the following components: 100kg of polymethyl methacrylate, 100kg of methyl methacrylate, 7kg of magnesia whisker and 0.5kg of silane coupling agent.
The preparation method comprises the following steps: firstly, performing surface pretreatment on magnesium oxide whiskers by using a silane coupling agent, then mixing the pretreated magnesium oxide whiskers with polymethyl methacrylate, uniformly stirring by using an ion stirrer to obtain mixed powder, then placing methyl methacrylate in a clean glass container, scattering the mixed powder into the methyl methacrylate, uniformly stirring, then placing the mixture at the environmental temperature of 30 ℃ for sealing and standing for 2 hours, after standing, no redundant methyl methacrylate exists in the container, the mixture becomes dough without sticky feeling, coating a separating agent in the mold, then starting to mold the mold, heating and curing the dough after the mold is molded, heating the dough in water at the temperature of 80 ℃ for 3 hours, then heating the dough in a water bath to the temperature of 104 ℃ for continuously heating for 2 hours, cooling the dough at the environmental temperature of 25 ℃ and then opening the mold, and finally polishing surface burrs or slight bubbles by using a polishing machine. Wherein the raw materials used are selected from table 1.
Detection method
Experiment one: flexural modulus of elasticity test
Experimental sample: the experimental sample bars obtained in examples 1 to 19 were designated as comparative samples 1 to 6, and the experimental sample bars obtained in comparative examples 1 to 6 were designated as comparative samples 1 to 6, and the experimental sample bars 1 to 19 and the comparative samples 1 to 6 were each designated as 5 in number, respectively, by heating in water at 80 ℃ for 3 hours, heating in a water bath to 104 ℃ for 2 hours, cooling at 25 ℃ and then opening the mold.
An experimental instrument: an electronic universal material testing machine (the manufacturer is Zhengzhou Huayin testing instrument Limited company, and the model is WDW-A).
The experimental method comprises the following steps: respectively carrying out flexural modulus detection experiments on experimental samples 1-19 and comparative samples 1-6 according to a flexural modulus experiment method in a plastic flexural performance experiment method of GB/T9341-2000; and controlling the radius of a pressure head of the electronic universal testing machine to be 5mm, the span to be 40mm, the experimental speed to be 1mm/min, recording a load-deflection curve, and calculating the bending elastic modulus.
For example, the flexural modulus of 5 test samples 1 are detected and calculated respectively, and the average value of the flexural moduli of 5 test samples 1 is taken as the final flexural modulus of the test sample 1; the elastic modulus detection experiments were performed on the experimental samples 2 to 19 and the comparative samples 1 to 6, respectively, according to the above experimental methods.
The experimental results are as follows: the results of the test for measuring the modulus of elasticity of the test samples 1 to 19 and the comparative samples 1 to 6 are shown in Table 4.
Experiment two: bending Strength test
Experimental samples: the experimental sample bars obtained in examples 1 to 19 were designated as comparative samples 1 to 6, and the experimental sample bars obtained in comparative examples 1 to 6 were designated as comparative samples 1 to 6, and the experimental sample bars 1 to 19 and the comparative samples 1 to 6 were each designated as 5 in number, respectively, by heating in water at 80 ℃ for 3 hours, heating in a water bath to 104 ℃ for 2 hours, cooling at 25 ℃ and then opening the mold.
An experimental instrument: an electronic universal material testing machine (the manufacturer is Zhengzhou Huayin testing instrument, inc., and the model is WDW-A).
The experimental method comprises the following steps: respectively carrying out bending strength detection experiments on the experimental samples 1-19 and the comparative samples 1-6 according to a bending strength experimental method in a plastic bending performance experimental method of national standard GB/T9341-2000; the radius of a pressure head of the electronic universal testing machine is controlled to be 5mm, the span is controlled to be 40mm, the experiment speed is 2mm/min, the maximum load when the electronic universal testing machine breaks is recorded and directly read from a scale, and the bending strength is recorded and calculated.
For example, the bending strengths of 5 experimental samples 1 are respectively detected and calculated, and the average value of the bending strengths of the 5 experimental samples 1 is taken as the final bending strength of the experimental sample 1; the bending strength test was performed on the test samples 2 to 19 and the comparative samples 1 to 6, respectively, according to the above test methods.
The bending strength test experiments were conducted on the test samples 2 to 19 and the comparative samples 1 to 6 according to the above-mentioned test methods.
The experimental results are as follows: the results of the flexural strength test of the experimental samples 1 to 19 and the comparative samples 1 to 6 are shown in Table 4.
Experiment three: impact Strength test
Experimental samples: the experimental sample bars obtained in examples 1 to 19 were designated as comparative samples 1 to 6, and the experimental sample bars obtained in comparative examples 1 to 6 were designated as comparative samples 1 to 6, and the experimental sample bars 1 to 19 and the comparative samples 1 to 6 were each designated as 5 in number, respectively, by heating in water at 80 ℃ for 3 hours, heating in a water bath to 104 ℃ for 2 hours, cooling at 25 ℃ and then opening the mold.
An experimental instrument: a simple beam impact tester (from Guangdong Kebao test Equipment Co., ltd., model KB-JZL-15D).
The experimental method comprises the following steps: according to the hard plastic simple beam impact test method of the national standard GB/T1043-93, a simple beam impact tester is adopted for testing, the impact energy is controlled to be 1J, the span is 40mm, the impact energy absorbed by an experimental sample is directly read from a dial, and the impact strength is calculated.
For example, the impact strengths of 5 experimental samples 1 are respectively recorded and calculated, and the average value of the impact strengths of the 5 experimental samples 1 is taken as the final impact strength of the experimental sample 1; the impact strength tests were conducted on the test samples 2 to 19 and the comparative samples 1 to 6, respectively, according to the above-mentioned test methods.
The test samples 2 to 19 and the comparative samples 1 to 6 were subjected to the test of impact strength test in accordance with the above test method.
The experimental results are as follows: the results of the impact strength tests of the test samples 1 to 19 and the comparative samples 1 to 6 are shown in Table 4.
TABLE 4 results of experiments of samples 1 to 19 and comparative samples 1 to 6
As is clear from the experimental data in Table 4, the flexural modulus of elasticity of the test samples 1 to 19 is 3.16 to 3.98GPa, the flexural strength is 112.78 to 114.89MPa, and the impact strength is 14.35 to 15.39kJ/m 2 While comparative samples 1 to 6 had flexural modulus of elasticity of 2.33 to 3.05Gpa, flexural strength of 92.17 to 108.36MPa, and impact strength of 5.64 to 11.86kJ/m 2 (ii) a The flexural modulus, impact strength and flexural strength of the experimental samples 1-19 are higher than those of the comparative samples 1-6, which shows that the experimental samples 1-19 have better crack resistance and toughness and are not easy to break.
Comparing the experimental sample 1 and the comparative samples 1 to 3, it can be known that the anti-cracking agent is formed by selecting the lignin fiber and the glass fiber, which is beneficial to enhancing the toughness of the denture base resin and further enhancing the anti-cracking performance; the fibers of the denture base resin and the denture base resin contain a large number of light-weight gaps, on one hand, the gaps enable the denture base resin to have good hardness, and the fiber crystals can be stretched to have high toughness, so that the crack resistance of the denture base resin is enhanced. As can be seen from comparison of the experimental sample 1 and the comparative samples 3 to 5, the halloysite powder has good viscosity and is matched with the anti-cracking agent, so that the bonding strength between the anti-cracking agent and each raw material of the denture base resin is enhanced, and the anti-cracking performance is further enhanced.
Comparing the experimental sample 1 with the experimental samples 3-4, it can be known that the copolymer of methyl methacrylate has better toughness and improved crack resistance compared with the homopolymer; comparing the experimental sample 3 with the experimental sample 5, it can be known that the preparation methods are different, and the obtained thermosetting denture base powder has a certain difference, but the influence of the crack resistance is small; comparing the experimental samples 5-7, it can be known that the anti-cracking performance and toughness of the denture base resin can be enhanced by adding the toughening agent; comparing the experimental samples 7-9, it can be seen that the toughening agent is selected from nano magnesium oxide and nano silicon dioxide, and the toughness of the denture base resin is improved, probably because the toughening agent and the nano silicon dioxide are mutually matched with styrene butadiene rubber to enhance the bonding effect and improve the copolymerization conversion efficiency, so that the toughness of the thermosetting denture base powder is enhanced, and the crack resistance of the denture base resin is further enhanced; comparing the experimental sample 3 with the experimental samples 8-9, the preparation method is optimized, and the toughening agent is added, so that the toughness and the crack resistance of the denture base resin are effectively enhanced; comparing the experimental sample 1 with the experimental samples 12-13, it can be known that the additive is one or two of rice hull powder and bamboo powder, and the internal stability of the denture base resin is enhanced and the toughness and the crack resistance of the denture base resin are enhanced through the interface combination effect between the additive and fibers such as the crack resistance agent; comparing the experimental sample 1 with the experimental samples 14-15, the specific components and weight of the additive are preferably selected, so that the rice hull powder, the bamboo powder, the anti-cracking agent and the halloysite powder are better matched, and the anti-cracking performance of the denture base resin is further enhanced; comparing the experimental sample 1 with the experimental samples 16-17, the optimal stirring speed can improve the efficiency and obtain the denture base resin with better crack resistance and toughness; comparing the experimental sample 1 with the experimental samples 18-19, the denture base resin with better crack resistance and toughness can be obtained by optimizing the formula and controlling the process parameters.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The denture base resin is characterized by comprising the following raw materials in parts by weight:
90-110 parts of thermosetting denture powder;
80-100 parts of methyl methacrylate;
0.3-0.5 part of benzoyl peroxide;
0.1-0.4 part of o-dimethyl dibutyl ester;
2-4 parts of a pigment;
0.8-2 parts of anti-cracking agent;
0.5-1 part of halloysite powder;
0.5-0.9 part of additive;
the additive consists of rice hull powder and bamboo powder, wherein the weight ratio of the rice hull powder to the bamboo powder is 1 (1-2);
the anti-cracking agent comprises at least one of lignin fiber and glass fiber.
2. The denture base resin according to claim 1, wherein the thermosetting denture powder is a copolymerized powder of methyl methacrylate.
3. The denture base resin according to claim 2, wherein said thermosetting denture powder is prepared by the steps of:
a1, mixing 60-80 parts by weight of methyl methacrylate and 0.2-0.5 part by weight of initiator, uniformly mixing, and heating at 75-90 ℃ for 20-40min to obtain prepolymerized methyl methacrylate;
and A2, mixing the pre-polymerized methyl methacrylate in the step A1 with 30-40 parts by weight of styrene butadiene rubber, uniformly mixing, polymerizing at the polymerization temperature of 80-90 ℃ for 3-6h, filtering, washing and drying to obtain the thermosetting denture powder.
4. The denture base resin according to claim 3, wherein 0.4-0.5 part by weight of toughening agent is added after polymerization in the step A2, and the mixture is uniformly mixed and then is kept warm for 1-3 hours.
5. The denture base resin according to claim 4, wherein the toughening agent is composed of nano magnesium oxide and nano silicon dioxide, and the weight ratio of the nano magnesium oxide to the nano silicon dioxide is 1 (1-1.5).
6. A method for preparing a denture base resin according to any one of claims 1 to 5, comprising the steps of:
s1, mixing methyl methacrylate, o-phthalic dimethyl dibutyl ester, benzoyl peroxide, a pigment, an anti-cracking agent and halloysite powder uniformly to obtain denture fixing water;
and S2, mixing denture base water and thermosetting denture base powder at the temperature of 30-50 ℃, standing to a dough period after uniformly mixing, and thus obtaining the denture base resin.
7. The method for preparing a denture base resin according to claim 6, wherein additives are added and mixed together in step S1.
8. The method for preparing a denture base resin according to claim 6, wherein the stirring speed in step S2 is 50-70r/min.
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