CN114106253A - Dental CAD/CAM removable denture layered machinable resin block and preparation method thereof - Google Patents

Dental CAD/CAM removable denture layered machinable resin block and preparation method thereof Download PDF

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CN114106253A
CN114106253A CN202111386777.2A CN202111386777A CN114106253A CN 114106253 A CN114106253 A CN 114106253A CN 202111386777 A CN202111386777 A CN 202111386777A CN 114106253 A CN114106253 A CN 114106253A
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resin
block
dental
layered
removable denture
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王全胜
陈震
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Shanghai Huliang Biomedical Technology Co ltd
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Shanghai Huliang Biomedical Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
    • C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
    • C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0006—Production methods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/08—Artificial teeth; Making same
    • A61C13/087—Artificial resin teeth
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/541—Silicon-containing compounds containing oxygen
    • C08K5/5425—Silicon-containing compounds containing oxygen containing at least one C=C bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/02—Fibres or whiskers
    • C08K7/04—Fibres or whiskers inorganic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/08—Ingredients agglomerated by treatment with a binding agent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • C08L33/12—Homopolymers or copolymers of methyl methacrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils

Abstract

The invention discloses a dental CAD/CAM removable denture layered cuttable resin block which is characterized by comprising an upper layer block and a lower layer block, wherein the upper layer block is used for carving teeth, the lower layer block is used for carving gingiva, the upper layer block is made of dental cutting resin, the lower layer block is made of base PMMA resin, and the dental cutting resin components comprise bisphenol a dimethacrylate, UDMA, PMMA, a solvent, a curing agent, a coupling agent and a filler. The application also discloses a preparation method of the dental CAD/CAM removable denture layered machinable resin block.

Description

Dental CAD/CAM removable denture layered machinable resin block and preparation method thereof
Technical Field
The invention relates to the field of denture processing, in particular to a dental CAD/CAM removable denture layered machinable resin block and a preparation method thereof.
Background
The CAD/CAM technology for dental restoration is a product combining advanced manufacturing technology and oral medicine, and is mainly based on a standard dental model and assisted by the diagnosis of doctors, so that the rapid digital design and manufacturing of the restoration are realized. The dental restoration technology can provide excellent dental restoration for a patient in a short time. The method has the advantages of saving time, reducing the labor intensity of medical technicians, improving the working environment of medical and technical rooms, banning temporary restorations, completing the manufacturing of the restorations at one time, reducing the number of times of patients seeing a doctor and improving the quality of the restorations.
At present, chinese patent publication No. CN113081348A discloses a three-dimensional layered dental processing resin block, and a preparation method and application thereof, including an upper layer block and a lower layer block, wherein the upper layer block is used for engraving teeth, the lower layer block is used for engraving gum, the upper layer block is made of enhanced PMMA resin, the lower layer block is made of base PMMA resin, and a resin formula and a resin block structure are improved, so as to improve the utilization rate and processing efficiency of materials.
However, the complete denture made of the resin block is mainly used as a temporary denture, and a denture needs to be additionally made at the later stage for a long time for a patient to use, mainly because of the limited performance of the PMMA resin, the requirements of long-time chewing abrasion and the like cannot be met.
Disclosure of Invention
The first purpose of the invention is to provide a dental CAD/CAM removable denture layer machinable resin block which has the advantages of stable performance and long service life.
The technical purpose of the invention is realized by the following technical scheme:
a layered cuttable resin block for dental CAD/CAM removable dentures, comprising an upper block for cutting teeth and a lower block for cutting gums, the upper block being made of dental cutting resin and the lower block being made of PMMA resin,
the dental cutting resin comprises the following components in parts by weight:
Figure BDA0003367339430000021
further setting: the filler is one or a composition of more of nano-fiber, gas-phase silicon dioxide, whisker and quartz powder.
Further setting: the filler is calculated according to the parts by weight
230-200 parts of gas-phase SiO,
20-100 parts of nano fibers.
Further setting: the fumed silica is grafted and modified by PMMA to form zero-dimensional nano-grafted silica filler, and the nano-fibers adopt core-shell nano-fibers.
Further setting: the solvent is MMA, the curing agent is BPO, and the coupling agent is methacryloxypropyl trimethoxysilane.
Further, the dental cutting resin comprises the following components in parts by weight:
Figure BDA0003367339430000022
Figure BDA0003367339430000031
further setting: the base PMMA resin comprises the following components in parts by weight:
Figure BDA0003367339430000032
further setting: the base PMMA resin comprises the following components in parts by weight:
Figure BDA0003367339430000033
by adopting the technical scheme, the bionic blood silk at the gum part is filled, and the bionic blood silk is obtained by blending the inorganic pigment color master batch and the nylon fiber, so that the bionic effect of the material is enhanced.
Further setting: the resin block structure includes the block and fixes along, the block includes fixed side, fixed side department is connected with the fixed edge that thickness is less than the block, fixed edge semi-encirclement in the fixed side of block, fixed edge is used for coupling fixture, fixed edge is last to have seted up a plurality of fixed orificess, the block is towards fixed side one side for fixed limit, the block is kept away from fixed side direction from fixed side one end width and is diminished gradually, the resin block is the axisymmetric structure, and fixed limit is perpendicular with the symmetry axis of resin block, the symmetry axis that the fixed orifices used the resin block is the axisymmetric.
The invention also aims to provide a preparation process of the dental CAD/CAM removable denture layered machinable resin block, which has the advantages of simple process and stable performance.
The technical purpose of the invention is realized by the following technical scheme:
a preparation process of a dental CAD/CAM removable denture layered machinable resin block is characterized by comprising the following steps:
step one, pouring dental cutting resin into a cavity of a pouring mold to fill part of the cavity;
step two, placing the casting mould at low temperature for refrigeration;
step three, adding the base PMMA resin into a casting mold after the resin is frozen and solidified, and completely filling the cavity of the casting mold;
step four, continuously refrigerating at low temperature until the frozen product is solidified;
and step five, placing the casting mold at high pressure, and curing and crosslinking at the temperature of 120-180 ℃ for 30-60 minutes.
In conclusion, the invention has the following beneficial effects:
the acrylic group is contained in the base PMMA resin and the dental cutting resin, which is beneficial to the fusion of the interface of the two resins and has high peel strength.
The silicon-oxygen group of the methacryloxypropyltrimethoxysilane can react with the hydroxyl on the surface of the nano-particle to form Si-O-Si bond under the condition of high temperature so as to carry out surface organic treatment, and meanwhile, the methacrylic acid acetate group contained in the molecule can be copolymerized, so that the SiO2 nano-particle is connected with the matrix. The SiO2 nano particles are treated by a bifunctional modifier of methacryloxypropyltrimethoxysilane, namely methacryloxypropyltrimethoxysilane, so that the bifunctional modifier can be adsorbed on the surfaces of the particles by chemical bonds, and can be copolymerized or polycondensed with monomers under the action of an initiator and a catalyst.
The coupling agent of methacryloxypropyltrimethoxysilane and SiO2 nanoparticles are used for chemical reaction, so that-CH-groups can be introduced to the particle surface. Dispersing the treated SiO2 nanoparticles in a mixed solvent containing monomers, and stabilizing SiO2 nanoparticles with a polymer network formed in the solution after the monomers are polymerized2The nano particles are uniformly dispersed. The invention utilizes-SiOCH of the methacryloxypropyltrimethoxysilane3With SiO2The surface light base is subjected to silane modification on the surface of the SiO2 nano particle through hydrolysis-condensation reaction, so that the surface base is reduced, meanwhile, the surface energy can be reduced by the organic molecules grafted on the surface, the agglomeration tendency of the organic molecules is improved to a certain extent, and the modified SiO2The compatibility of the nano particles and PMMA is improved, so that the nano particles are easily and better dispersed in a PMMA system, and the effect of improving the mechanical property is achieved.
The PMMA can be partially dissolved in a bisphenol a dimethacrylate resin matrix, has good compatibility with the resin matrix, forms a three-dimensional network structure after photopolymerization, and improves the structural strength.
The ceramic one-dimensional nano-fiber can obviously improve the wear resistance of the composite material. The increased wear resistance is due to the porous structure fixing the filler in the resin matrix, limiting the shedding and extraction of filler particles as the composite wears. The one-dimensional ceramic nanofiber can effectively reduce the polymerization shrinkage of resin, and the reason for reducing the shrinkage is probably that the fibers are lapped to form a three-dimensional net structure, and the tiny space among the fibers has a certain limiting effect on the shrinkage of a polymer chain. The nano filler has the characteristics of small size effect, surface effect and the like, can obviously improve the interface area with a resin matrix, and can obviously improve the strength, toughness and wear resistance of the light-cured composite resin under the condition of very low filling amount.
Drawings
FIG. 1 is a schematic view of the overall structure of embodiment 1;
FIG. 2 is a schematic view of the structure of the jig of embodiment 2 when holding a dental resin block;
fig. 3 is a schematic diagram of the exploded structure of fig. 2.
In the figure, 1, block; 2. a fixing edge; 3. a fixing hole; 4. fixing the edge; 5. a first side edge; 6. a second side edge; 7. a lower clamp body; 8. an upper clamp body; 9. a clip; 10. fixing grooves; 11. a locking groove; 12. a connecting projection; 13. an upper lock hole; 14. a locking hole; 15. a lower lock hole; 16. and (6) installing a notch.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1: the utility model provides a dental resin piece, as shown in fig. 1, includes block 1 and the fixed edge 2 that is used for connecting anchor clamps, and block 1 includes fixed side, and fixed side department is connected with the fixed edge 2 that thickness is less than block 1, and fixed edge 2 partly surrounds in the fixed side of block 1, has seted up two fixed orificess 3 on the fixed edge 2. The fixed hole 3 is a through hole, and guide fillets are arranged at openings at two ends of the fixed hole 3. The resin block is in an axisymmetric structure, the fixing edge 4 is vertical to the symmetry axis of the resin block, and the fixing hole 3 is axisymmetric with the symmetry axis of the resin block.
Block 1 is for fixed limit 4 towards fixed side one side, and block 1 is kept away from fixed side one end width diminishing gradually from fixed side direction, and block 1 includes first side 5 and second side 6, passes through first fillet transition between first side 5 and the second side 6, between second side 6 and the fixed limit 4, passes through the second fillet transition between first side 5 and the fixed limit 4, forms the block 1 of teethridge shape.
This dental resin block's anchor clamps, as shown in fig. 2 and 3, the dental resin block that is used for in embodiment 1 includes lower clamp 7, upper clamp 8 and clamping piece 9, and lower clamp 7 and upper clamp 8 all are circular-arc structure, and the circular arc inboard of lower clamp 7 includes fixed slot 10 and locking groove 11, and fixed slot 10 height equals along the thickness of 2 with fixed, and fixed edge 2 is connected between clamping piece 9 and fixed slot 10 tank bottom, and locking groove 11 is used for holding upper clamp 8. The clamping piece 9 is provided with a connecting bulge 12, the connecting bulge 12 is punched in the punch press, the top end of the connecting bulge 12 is a round head, and after the connecting bulge 12 is inserted into the fixing hole 3, the outer side surface of the connecting bulge 12 is abutted against the inner wall of the fixing hole 3.
The clamping piece 9 is further provided with a kidney-shaped locking hole 14, the locking hole 14 is in the radial direction of an arc of the clamping piece 9, the upper clamping body 8 is provided with a step-shaped upper locking hole 13, the locking groove 11 is provided with a lower locking hole 15, and the clamping piece 9 is fixed by the bolts through the upper locking hole 13, the locking hole 14 and the lower locking hole 15 in sequence. The clip 9 comprises a mounting notch 16 cooperating with the block 1, the mounting notch 16 abutting against the edge of the block 1.
The working principle is as follows:
during the installation, earlier put into fixed slot 10 department along 2 fixed edge of resin piece, then detain installation breach 16 cooperation block 1 of clamping piece 9, make in connecting protrusion 12 inserts fixed orifices 3, the side of connecting protrusion 12 is contradicted with fixed orifices 3, then put upper clamp 8 to locking groove 11 department, supreme lockhole 13 of adjustment, lockhole 14 and lower lockhole 15 alignment state, clamp 8 and lower clamp 7 locking will be gone up through the bolt, the width of bolt and lockhole 14, restriction clamping piece 9 is relative to upper clamp 8 and lower clamp 7 take place the translation, accomplish the installation.
Example 2:
the layered cuttable resin block for dental CAD/CAM removable denture comprises an upper layer block and a lower layer block, wherein the upper layer block is used for carving teeth, the lower layer block is used for carving gingiva, the upper layer block is made of dental cutting resin, and the lower layer block is made of base PMMA resin.
The dental cutting resin comprises the following weight component units (unit: g):
Figure BDA0003367339430000071
the base PMMA resin comprises the following components in parts by weight (unit: g):
Figure BDA0003367339430000072
Figure BDA0003367339430000081
the preparation process comprises the following steps: step one, pouring dental cutting resin into a cavity of a pouring mold to fill part of the cavity;
step two, placing the casting mould at low temperature for refrigeration;
step three, adding the base PMMA resin into a casting mold after the resin is frozen and solidified, and completely filling the cavity of the casting mold;
step four, continuously refrigerating at low temperature until the frozen product is solidified;
and step five, placing the casting mould at high pressure, and curing and crosslinking for 40 minutes at the temperature of 140 ℃.
Example 3:
the layered cuttable resin block for dental CAD/CAM removable denture comprises an upper layer block and a lower layer block, wherein the upper layer block is used for carving teeth, the lower layer block is used for carving gingiva, the upper layer block is made of dental cutting resin, and the lower layer block is made of base PMMA resin.
The dental cutting resin comprises the following weight component units (unit: g):
Figure BDA0003367339430000082
the base PMMA resin comprises the following components in parts by weight (unit: g):
Figure BDA0003367339430000083
Figure BDA0003367339430000091
the preparation process comprises the following steps: step one, pouring dental cutting resin into a cavity of a pouring mold to fill part of the cavity;
step two, placing the casting mould at low temperature for refrigeration;
step three, adding the base PMMA resin into a casting mold after the resin is frozen and solidified, and completely filling the cavity of the casting mold;
step four, continuously refrigerating at low temperature until the frozen product is solidified;
and step five, placing the casting mould at high pressure, and curing and crosslinking at the temperature of 120 ℃ for 60 minutes.
Example 4:
the layered cuttable resin block for dental CAD/CAM removable denture comprises an upper layer block and a lower layer block, wherein the upper layer block is used for carving teeth, the lower layer block is used for carving gingiva, the upper layer block is made of dental cutting resin, and the lower layer block is made of base PMMA resin.
The dental cutting resin comprises the following weight component units (unit: g):
Figure BDA0003367339430000092
Figure BDA0003367339430000101
the base PMMA resin comprises the following components in parts by weight (unit: g):
Figure BDA0003367339430000102
the preparation process comprises the following steps: step one, pouring dental cutting resin into a cavity of a pouring mold to fill part of the cavity;
step two, placing the casting mould at low temperature for refrigeration;
step three, adding the base PMMA resin into a casting mold after the resin is frozen and solidified, and completely filling the cavity of the casting mold;
step four, continuously refrigerating at low temperature until the frozen product is solidified;
and step five, placing the casting mould at high pressure, and curing and crosslinking for 50 minutes at the temperature of 150 ℃.
Example 5:
the layered cuttable resin block for dental CAD/CAM removable denture comprises an upper layer block and a lower layer block, wherein the upper layer block is used for carving teeth, the lower layer block is used for carving gingiva, the upper layer block is made of dental cutting resin, and the lower layer block is made of base PMMA resin.
The dental cutting resin comprises the following weight component units (unit: g):
Figure BDA0003367339430000103
Figure BDA0003367339430000111
the base PMMA resin comprises the following components in parts by weight (unit: g):
Figure BDA0003367339430000112
the preparation process comprises the following steps: step one, pouring dental cutting resin into a cavity of a pouring mold to fill part of the cavity;
step two, placing the casting mould at low temperature for refrigeration;
step three, adding the base PMMA resin into a casting mold after the resin is frozen and solidified, and completely filling the cavity of the casting mold;
step four, continuously refrigerating at low temperature until the frozen product is solidified;
step five, placing the casting mould at high pressure and curing and crosslinking for 30 minutes at the temperature of 180 DEG C
Example 6:
the layered cuttable resin block for dental CAD/CAM removable denture comprises an upper layer block and a lower layer block, wherein the upper layer block is used for carving teeth, the lower layer block is used for carving gingiva, the upper layer block is made of dental cutting resin, and the lower layer block is made of base PMMA resin.
The dental cutting resin comprises the following weight component units (unit: g):
Figure BDA0003367339430000113
Figure BDA0003367339430000121
the base PMMA resin comprises the following components in parts by weight (unit: g):
Figure BDA0003367339430000122
the preparation process comprises the following steps: step one, pouring dental cutting resin into a cavity of a pouring mold to fill part of the cavity;
step two, placing the casting mould at low temperature for refrigeration;
step three, adding the base PMMA resin into a casting mold after the resin is frozen and solidified, and completely filling the cavity of the casting mold;
step four, continuously refrigerating at low temperature until the frozen product is solidified;
and step five, placing the casting mould at high pressure, and curing and crosslinking for 45 minutes at the temperature of 170 ℃.
Comparative example 1:
the layered cuttable resin block for dental CAD/CAM removable denture comprises an upper layer block and a lower layer block, wherein the upper layer block is used for carving teeth, the lower layer block is used for carving gingiva, the upper layer block is made of dental cutting resin, and the lower layer block is made of base PMMA resin.
The dental cutting resin comprises the following weight component units (unit: g):
Figure BDA0003367339430000131
the base PMMA resin comprises the following components in parts by weight (unit: g):
Figure BDA0003367339430000132
the preparation process comprises the following steps: step one, pouring dental cutting resin into a cavity of a pouring mold to fill part of the cavity;
step two, placing the casting mould at low temperature for refrigeration;
step three, adding the base PMMA resin into a casting mold after the resin is frozen and solidified, and completely filling the cavity of the casting mold;
step four, continuously refrigerating at low temperature until the frozen product is solidified;
and step five, placing the casting mould at high pressure, and curing and crosslinking for 50 minutes at the temperature of 150 ℃.
Comparative example 2:
a commercially available PMMA resin disk was purchased from Kyobei Shimei Biotech Co., Ltd.
And (3) performance testing:
1. test of bending Strength of dental cutting resin
The resins of examples 2 to 6 and comparative example 1 were used as test standards, and a three-point bending test was carried out in an electronic universal testing machine, and the flexural strength was directly read by a computer. The results of the measurements are shown in Table 1 below.
2. Test of Shore hardness of dental cutting resin
The resin blocks of examples 2 to 6 and comparative examples 1 to 2 were subjected to hardness test on the dental cutting resin by a shore durometer, and in the test, the side surface of the resin block was fixed to avoid deformation of the underlying resin. The results of the measurements are shown in Table 1 below.
3. Test of frictional Properties of dental cutting resin
In examples 2 to 6 and comparative example 1, the resin was processed into a disk shape similar to that of comparative example 2, and the frictional wear performance was measured by a CSM frictional wear tester using a ball-disk type contact method to obtain the wear rate. The results of the measurements are shown in Table 1 below.
TABLE 1 dental cutting resin Performance test results Table
Figure BDA0003367339430000141
Figure BDA0003367339430000151
As can be seen from Table 1, the examples have better mechanical properties, and the mechanical properties are obviously reduced due to the small filling amount of the filler in example 3; comparing comparative example 1 and example 4, it can be seen that the nanofiber has a better effect on the improvement of mechanical properties.
4. Testing of bending Strength of the base PMMA resin
The PMMA resin base in examples 2 to 6 was used as a test standard, a three-point bending test was conducted in an electronic universal testing machine, and the flexural strength was directly read out by a computer. The results of the measurements are shown in Table 2 below.
5. Shore hardness test of base PMMA resin
The resin blocks of examples 2 to 6 were subjected to shore hardness test to measure the hardness of the PMMA resin in the base, and during the test, the side surfaces of the resin blocks were fixed to prevent the deformation of the underlying base resin. The results of the measurements are shown in Table 2 below.
Group of Flexural Strength (MPa) Shore Hardness (HA)
Example 2 97.2 87
Example 3 90.1 85
Example 4 98.9 90
Example 5 94.6 86
Example 6 95.7 85
As can be seen from Table 2, the base PMMA resin has better mechanical properties and can meet the requirement of gum strength.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-mentioned embodiments should be included in the protection scope of the technical solution.

Claims (9)

1. A layered cuttable resin block for dental CAD/CAM removable dentures, comprising an upper layer block for cutting teeth and a lower layer block for cutting gums, wherein the upper layer block is made of dental cutting resin and the lower layer block is made of PMMA resin,
the dental cutting resin comprises the following components in parts by weight:
Figure FDA0003367339420000011
2. the dental CAD/CAM removable denture layered machinable resin block according to claim 1, wherein the filler is a combination of one or more of nanofibers, fumed silica, whiskers, and quartz powder.
3. The dental CAD/CAM removable denture layer-cuttable resin block according to claim 2, wherein said filler is in parts by weight
230-200 parts of gas-phase SiO,
20-100 parts of nano fibers.
4. The dental CAD/CAM removable denture layer-cuttable resin block according to claim 1, wherein the solvent is MMA, the curing agent is BPO, and the coupling agent is methacryloxypropyl trimethoxysilane.
5. The dental CAD/CAM removable denture layer-cuttable resin block according to claim 1, comprising the following components in parts by weight:
Figure FDA0003367339420000021
6. the dental CAD/CAM removable denture layered machinable resin block according to claim 1 or 5, wherein the base PMMA resin comprises the following components in parts by weight:
Figure FDA0003367339420000022
7. the dental CAD/CAM removable denture layered machinable resin block according to claim 6, wherein the base PMMA resin comprises the following components in parts by weight:
Figure FDA0003367339420000023
8. the dental CAD/CAM removable denture layered machinable resin block according to claim 1, wherein the resin block structure comprises a block body and a fixing edge, the block body comprises a fixing side, the fixing edge with a thickness smaller than that of the block body is connected to the fixing side, the fixing edge is semi-enclosed on the fixing side of the block body and is used for connecting a clamp, a plurality of fixing holes are formed in the fixing edge, a fixing edge is formed on one side of the block body facing the fixing side, the width of the block body gradually decreases from the fixing side to the end far away from the fixing side, the resin block is in an axisymmetric structure, the fixing edge is perpendicular to the symmetry axis of the resin block, and the fixing holes are axisymmetric with the symmetry axis of the resin block.
9. A preparation process of a dental CAD/CAM removable denture layered machinable resin block is characterized by comprising the following steps:
step one, pouring dental cutting resin into a cavity of a pouring mold to fill part of the cavity;
step two, placing the casting mould at low temperature for refrigeration;
step three, adding the base PMMA resin into a casting mold after the resin is frozen and solidified, and completely filling the cavity of the casting mold;
step four, continuously refrigerating at low temperature until the frozen product is solidified;
and step five, placing the casting mold at high pressure, and curing and crosslinking at the temperature of 120-180 ℃ for 30-60 minutes.
CN202111386777.2A 2021-11-22 2021-11-22 Dental CAD/CAM removable denture layered machinable resin block and preparation method thereof Pending CN114106253A (en)

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CN115245395A (en) * 2022-07-27 2022-10-28 荣嘉医疗科技(集团)有限公司 Synthetic resin tooth

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CN103211711A (en) * 2013-04-02 2013-07-24 东华大学 Highly wear-resisting composite resin with high modulus for dental repair and preparation method thereof
CN113081348A (en) * 2021-03-30 2021-07-09 上海沪亮生物医药科技有限公司 Three-dimensional layered dental processing resin block and preparation method and application thereof

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CN103211711A (en) * 2013-04-02 2013-07-24 东华大学 Highly wear-resisting composite resin with high modulus for dental repair and preparation method thereof
CN113081348A (en) * 2021-03-30 2021-07-09 上海沪亮生物医药科技有限公司 Three-dimensional layered dental processing resin block and preparation method and application thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115245395A (en) * 2022-07-27 2022-10-28 荣嘉医疗科技(集团)有限公司 Synthetic resin tooth
CN115245395B (en) * 2022-07-27 2024-01-26 荣嘉医疗科技(集团)有限公司 Synthetic resin tooth

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