WO2010058822A1 - 有床義歯及びその製造方法 - Google Patents

有床義歯及びその製造方法 Download PDF

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Publication number
WO2010058822A1
WO2010058822A1 PCT/JP2009/069652 JP2009069652W WO2010058822A1 WO 2010058822 A1 WO2010058822 A1 WO 2010058822A1 JP 2009069652 W JP2009069652 W JP 2009069652W WO 2010058822 A1 WO2010058822 A1 WO 2010058822A1
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Prior art keywords
denture
artificial tooth
base
old
image
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PCT/JP2009/069652
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English (en)
French (fr)
Japanese (ja)
Inventor
学 金澤
俊介 水口
佑介 佐藤
圭 大宅
正直 猪越
Original Assignee
国立大学法人東京医科歯科大学
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Application filed by 国立大学法人東京医科歯科大学 filed Critical 国立大学法人東京医科歯科大学
Priority to JP2010539251A priority Critical patent/JP5610394B2/ja
Priority to US13/130,300 priority patent/US20110236856A1/en
Publication of WO2010058822A1 publication Critical patent/WO2010058822A1/ja

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    • 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
    • A61C13/10—Fastening of artificial teeth to denture palates or the like
    • A61C13/1003—Fastening of artificial teeth to denture palates or the like by embedding in base material

Definitions

  • the present invention relates to a plate denture and a manufacturing method thereof.
  • a base denture is a denture in which artificial teeth are planted on the base denture base.
  • a denture is installed in the oral cavity with the mucosal surface of the denture base in close contact with the oral mucosa to compensate for the function lost by the loss of natural teeth.
  • Complete dentures are made for edentulous jaws that have lost all natural teeth.
  • denture base There are two types of denture base: metal floor and resin floor.
  • Resin beds made of acrylic resins such as polymethyl methacrylate (PMMA) are widely used from the viewpoint of ease of production of dentures and biocompatibility.
  • the types of artificial teeth include resin teeth, porcelain teeth, and metal teeth. When a resin bed is used, a resin tooth made of the same acrylic resin is often used because of good adhesion.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 11-139919
  • Patent Document 2 Japanese Patent Application Laid-Open No. 11-139919
  • Patent Document 3 JP-A-6-304190
  • the surface shape of an impression material from which a precise impression has been taken is measured in a non-contact manner by a three-dimensional measuring device using light irradiation, and the ridge shape converted into electronic data is obtained.
  • a method for creating a denture which is obtained, a shape model of the denture base is created from the shape of the ridge by CAD, and the denture is created by stereolithography.
  • Japanese Patent Application Laid-Open No. 6-304190 discloses that the jawbone shape is collected by a noninvasive measurement method such as X-ray CT imaging, and the surface shape of the oral mucosal surface is obtained from a precise impression collected using an impression material.
  • a method is proposed in which a denture base shape model is designed by correcting the surface shape of the mucous membrane surface based on the jawbone shape by CAD, and a denture base is produced by an NC machine tool by CAM.
  • Denture stains include food residues, denture plaques, stains (pigmentation), tartar, etc., all of which are difficult to remove only by washing with water.
  • the removal of stains requires the use of denture dentifrice or denture cleanser. It is not preferable to leave the denture dirt from the viewpoint of aesthetics. It also leads to the propagation of bacteria in the oral cavity, which is not preferable for oral hygiene.
  • the present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a floor having excellent durability, which makes it difficult for dirt to adhere to it and can easily remove dirt even if dirt is attached. To provide dentures. Another object of the present invention is to provide a method for producing a plate denture capable of accurately producing a plate denture.
  • the invention according to claim 1 is a denture having a denture base made of ultrahigh molecular weight polyethylene formed in a predetermined shape and artificial teeth arranged on the denture base. is there.
  • the denture base is formed into a predetermined shape by cutting a molded product of ultra high molecular weight polyethylene, and the artificial tooth is bonded to a recess for an artificial tooth arrangement formed on the surface of the denture base.
  • the artificial tooth is an acrylic resin resin tooth, and at least the concave portion of the denture base is surface-modified so as to be able to adhere to the acrylic resin, and is then bonded to the surface-modified concave portion.
  • the concave portion of the denture base is impregnated with an impregnating agent having an affinity for ultra high molecular weight polyethylene, and a hydrophilic group is introduced on the surface of the ultra high molecular weight polyethylene impregnated with the impregnating agent.
  • an impregnating agent having an affinity for ultra high molecular weight polyethylene
  • a hydrophilic group is introduced on the surface of the ultra high molecular weight polyethylene impregnated with the impregnating agent.
  • the invention according to claim 5 is the denture according to any one of claims 1 to 4, wherein the acrylic resin is polymethyl methacrylate (PMMA).
  • PMMA polymethyl methacrylate
  • the invention according to claim 6 is the denture according to claim 1, wherein the denture base and the artificial tooth are integrally formed into a predetermined shape by cutting a molded product of ultra high molecular weight polyethylene.
  • the invention according to claim 7 is the denture according to any one of claims 1 to 6, wherein the ultrahigh molecular weight polyethylene has a water absorption of 0.01% by weight or less.
  • the invention of claim 8 is a method for producing a denture for producing a denture according to claims 1 to 5 and 7, wherein the ultrahigh molecular weight polyethylene is produced based on the three-dimensional shape information of the denture base. Cutting the molded product to form a denture base into a predetermined shape, modifying the surface of the denture base recess formed on the surface of the denture base so that it can be bonded to acrylic resin, and surface modification And a step of adhering artificial teeth to the recessed portion.
  • the invention of claim 9 includes a step of correcting the shape and occlusal height of the mucosal surface in contact with the oral mucosa of the old denture by applying a mucosal adjusting material for adjusting the mucosal surface of the denture base, A process of performing imaging and acquiring imaging data of the corrected old denture, a process of performing imaging of the artificial tooth and acquiring imaging data of the artificial tooth, and a corrected based on the imaging data of the corrected old denture Display the three-dimensional image of the old denture, display the three-dimensional image of the artificial tooth based on the imaging data of the artificial tooth, optimize the artificial tooth arrangement and the form of the mucous membrane surface in the displayed three-dimensional image, A step of acquiring three-dimensional shape information of the new denture based on the displayed three-dimensional image of the new denture, and removing the artificial tooth from the new denture in the displayed three-dimensional image of the new denture, and displaying the displayed denture Denture Denture base of new denture based on 3D image of floor
  • Invention of Claim 10 is a manufacturing method of the denture which manufactures the denture of Claim 6, Comprising: Based on the three-dimensional shape information of the denture provided with the denture base and the artificial tooth, ultra high molecular weight It is a manufacturing method of a denture with a denture provided with the process of cutting the polyethylene molding and integrally forming the denture base and the artificial tooth in a predetermined shape.
  • the invention of claim 11 includes a step of correcting the shape and occlusal height of the mucosal surface in contact with the oral mucosa of the old denture by applying a mucosa adjusting material for adjusting the mucosal surface of the denture base, A process of performing imaging and acquiring imaging data of the corrected old denture, a process of performing imaging of the artificial tooth and acquiring imaging data of the artificial tooth, and a corrected based on the imaging data of the corrected old denture Display the three-dimensional image of the old denture, display the three-dimensional image of the artificial tooth based on the imaging data of the artificial tooth, optimize the artificial tooth arrangement and the form of the mucous membrane surface in the displayed three-dimensional image, A step of acquiring three-dimensional shape information of the new denture based on the displayed three-dimensional image of the new denture, and a three-dimensional shape of the denture having the denture base and the artificial tooth based on the displayed three-dimensional image of the new denture And further comprising the step of obtaining information.
  • the invention of claim 12 is the step of photographing the old denture and acquiring imaging data of the old denture, displaying the three-dimensional image of the old denture based on the imaging data of the old denture, and based on the data of only the artificial tooth
  • a step of displaying a three-dimensional image of an artificial tooth and acquiring three-dimensional shape information of the new denture based on the three-dimensional image of the new denture displayed by the three-dimensional image of the old denture and the three-dimensional image of the artificial tooth And removing the artificial tooth from the new denture in the displayed three-dimensional image of the new denture, and acquiring the three-dimensional shape information of the denture base of the new denture based on the three-dimensional image of the denture base of the displayed new denture; , Based on the three-dimensional shape information of the denture base of the new denture, a step of forming a resin on the denture base of a predetermined shape, and a step of adhering the artificial tooth to the concave portion for the artificial tooth arrangement formed
  • the invention of claim 13 is a step of correcting the form and occlusal height of the mucosal surface in contact with the oral mucosa of the old denture by applying a mucosa adjusting material for adjusting the mucosal surface of the denture base or by remodeling of the denture base, Imaging of artificial teeth, acquiring imaging data of artificial teeth only, and three-dimensional images displayed by three-dimensional images of old dentures and three-dimensional images of artificial teeth.
  • the invention of claim 14 is a step of taking an image of an old denture, obtaining imaging data of the old denture, displaying a three-dimensional image of the old denture based on the imaging data of the old denture, and based on data of only the artificial tooth
  • a step of displaying a three-dimensional image of an artificial tooth and acquiring three-dimensional shape information of the new denture based on the three-dimensional image of the new denture displayed by the three-dimensional image of the old denture and the three-dimensional image of the artificial tooth And obtaining the three-dimensional shape information of the denture having the denture base and the artificial tooth based on the displayed three-dimensional image of the new denture, and the three-dimensional shape information of the denture having the denture base and the artificial tooth.
  • the invention of claim 15 is a step of correcting the form and occlusal height of the mucosal surface in contact with the oral mucosa of the old denture by applying a mucosa adjusting material for adjusting the mucosal surface of the denture base or by remodeling of the denture base, Imaging of artificial teeth, acquiring imaging data of artificial teeth only, and three-dimensional images displayed by three-dimensional images of old dentures and three-dimensional images of artificial teeth.
  • the present invention it is possible to provide a denture that is difficult to adhere to dirt, can be easily removed even if dirt adheres, and has excellent durability. Moreover, according to this invention, the manufacturing method of a plate denture which can manufacture a plate denture accurately can be provided.
  • FIG. 3 is a view showing a state where artificial teeth are attached to a denture base. It is a figure which shows a mode that an artificial tooth is attached to a denture base. It is a graph which shows the evaluation result of the antifouling performance of each test piece.
  • FIG. 1 is a perspective view showing the external appearance of a complete denture.
  • 2A is a plan view of the upper denture viewed from the occlusal surface side
  • FIG. 2B is a plan view of the upper denture viewed from the mucosal surface side.
  • a complete denture 10 applied to a patient with upper and lower edentulous jaws is configured such that an upper denture 12 and a lower denture 14 mesh with each other.
  • the upper denture 12 includes a denture base 16 and a plurality of artificial teeth 18 planted on the occlusal surface side of the denture base 16.
  • the lower denture 14 includes a denture base 20 and a plurality of artificial teeth 22 planted on the occlusal surface side of the denture base 20.
  • the maxillary denture 12 is a substantially triangular shape in plan view with the lip side as the apex angle and the throat side as the base.
  • the denture base 16 has an occlusal surface 16A on the side where the artificial teeth are occluded, and a mucosal surface 16B on the side to be in close contact with the oral mucosa.
  • the occlusal surface 16A of the denture base 16 the outer periphery along two sides other than the bottom is raised in a convex shape, and the periphery and the center of the bottom are recessed.
  • a plurality of artificial teeth 18 are planted on the protruding portion of the denture base 16.
  • the plurality of artificial teeth 18 are arranged substantially symmetrically from the labial side to the throat side, like natural teeth.
  • the outer peripheral portion along two sides other than the bottom side is recessed in a concave shape, and the periphery and the center of the bottom side are raised, contrary to the occlusal surface 16A.
  • the planar view of the lower denture 14 is also substantially triangular.
  • the denture base 20 of the lower denture 14 has an occlusal surface 20A on the side where the artificial teeth are occluded, and a mucosal surface 20B on the side where the artificial teeth are brought into close contact with the oral mucosa (see FIG. 3). Since the structure is generally the same as that of the maxillary denture 12, a description thereof will be omitted below.
  • FIG. 3 is a partial cross-sectional view showing a mounted state of the complete denture.
  • the complete denture 10 including the upper denture 12 and the lower denture 14 is mounted between the upper jaw ridge 24 and the lower jaw ridge 30 in the oral cavity of the patient.
  • the maxillary ridge 24 is composed of a maxilla 26 and a gingiva 28 covering the maxilla 26.
  • the mucosal surface 16B of the denture base 16 of the upper denture 12 is mounted so as to be in close contact with the gingiva 28 which is the oral mucosa.
  • the mandibular ridge 30 includes a mandible 32 and a gingiva 34 covering the mandible 32.
  • the mucosal surface 20B of the denture base 20 of the lower denture 14 is mounted so as to be in close contact with the gingiva 34 which is the oral mucosa.
  • the jaw ridge is also called an alveolar ridge.
  • FIG. 3 shows the mucosal surface 16B and the gingiva 28, and the mucosal surface 20B and the gingival 34 separated from each other for easy viewing.
  • the denture base 16 and the denture base 20 are resin beds formed by cutting a molded article of ultra high molecular weight polyethylene.
  • Ultra-high molecular weight polyethylene is generally classified as a thermoplastic resin, and refers to high density polyethylene having a very large weight average molecular weight of about 1 million to about 8 million.
  • Ultra High Molecular Weight Polyethylene is abbreviated as UHPE, UHMWPE or PE-UHMW. Hereinafter, it is abbreviated as “PE-UHMW”.
  • PE-UHMW is manufactured by polymerizing ethylene by a low pressure polymerization method. By increasing the reaction time, the ultra-high molecular weight can be increased. The flowability of the thermoplastic resin decreases as the molecular weight increases.
  • JIS-K-6936-1 Japanese Industrial Standard
  • PE-UHMW to which the standard is applied has a melt mass flow rate (MFR), which is a measure of the fluidity of a thermoplastic resin, of 190 ° C., 21. It is defined as a polyethylene material of less than 0.1 g / 10 min when measured at 6 kg.
  • MFR melt mass flow rate
  • ultra high molecular weight polyethylene means PE-UHMW to which the above Japanese Industrial Standards are applied.
  • PE-UHMW Because of its high molecular weight, PE-UHMW, for example, has low water absorption and excellent dimensional stability, excellent impact resistance in a wide temperature range, excellent wear resistance, and self-lubricating properties. It has various features such as excellent, light specific gravity, excellent weather resistance, and excellent biocompatibility. Because of these characteristics, they are also used as medical materials such as artificial joints and prosthetic limb materials. For the use of medical materials, PE-UHMW having a weight average molecular weight of 5 million or more is used.
  • PE-UHMW moldings are supplied to the market in the form of plates (plates), thick plates (blocks), thin plates (sheets), round bars (rods), and the like.
  • PE-UHMW has extremely low fluidity when melted and is not suitable for injection molding. Therefore, a PE-UHMW molded product is manufactured by compression molding or hollow molding (blow molding) of PE-UHMW powder.
  • the commercially available PE-UHMW powder is a fine particle having an average particle diameter of 25 ⁇ m to 30 ⁇ m, and is produced by a suspension polymerization method.
  • PE-UHMW As the resin for the floor used for the denture base 16 and the denture base 20, PE-UHMW to which the above-mentioned Japanese Industrial Standard is applied can be used.
  • PE-UHMW which is excellent in biocompatibility, is suitable for a denture base resin to be installed in the oral cavity.
  • PE-UHMW having a weight average molecular weight of 5 million or more is more suitable because of its track record of being used for medical materials.
  • the denture base 16 and the denture base 20 are formed by cutting these molded products in the form of PE-UHMW blocks or rods.
  • trade name “Thirlen” manufactured by Quadland Corporation can be used as a molded product of PE-UHMW.
  • a resin bed made of PMMA molded by injection molding using a plaster mold shrinks after molding, so that it is difficult to produce it as it is.
  • a resin bed made of PE-UHMW is produced by cutting a molded product, so that it does not shrink and can be produced with high accuracy.
  • the molding can be cut by operating an NC machine tool based on control information (NC data) created by CAD / CAM described later.
  • PE-UHMW ultrahigh molecular weight polyethylene
  • the above physical property values are values obtained mainly in tests based on the American Society for Testing Materials (ASTM) standards.
  • ASTM American Society for Testing Materials
  • ⁇ represents almost no erosion at about 20 ° C, 50 ° C, and 80 ° C
  • ⁇ represents dissolution at a high concentration
  • x represents dissolution. .
  • PE-UHMW has an extremely low “water absorption rate” compared to PMMA, and the molded product (resin bed) has a high surface tension, hardly adheres to dirt, and hardly generates bacteria.
  • PE-UHMW has extremely high “impact strength” and “bending strength” compared to PMMA, and its molded product (resin floor) is not easily broken.
  • PE-UHMW has a lighter “specific gravity” than PMMA, and can reduce the weight of the molded product (resin floor).
  • PE-UHMW is superior in “chemical resistance (strong alkali resistance, etc.)” compared to PMMA, and its molded product (resin bed) is excellent in durability against detergents.
  • the PE-UHMW resin floor has a very low “water absorption” characteristic of PE-UHMW, making it difficult for dirt to adhere compared to other resin floors. An excellent effect that it can be removed is exhibited.
  • This antifouling performance is the most important performance for a denture from the viewpoint of aesthetics, durability, oral hygiene and the like.
  • PE-UHMW resin floors are less likely to break than other resin floors due to the extremely high “impact strength” and “bending strength” of PE-UHMW.
  • the resin floor made of PE-UHMW is excellent in antifouling performance and is not easily broken. Therefore, according to the present invention, it is possible to provide a denture with excellent durability compared to the conventional one. Become.
  • the denture base 16 and the denture base 20 are usually colored in a color tone close to gingiva from the viewpoint of aesthetics.
  • a color material pigment, dye, pigment
  • the resin bed may be colored when the PE-UHMW molded product is produced or after the PE-UHMW molded product is cut.
  • a coloring material is added to PE-UHMW powder and compression molding or hollow molding is performed.
  • the addition amount of the coloring material is about 1% by weight or less with respect to the whole molding material, and has almost no influence on other physical properties.
  • surface modification of PE-UHMW is performed, and a liquid color material is impregnated from the surface layer to the inside.
  • the artificial tooth 18 and the artificial tooth 22 are planted on a convex portion on the occlusal surface side of a resin floor made of PE-UHMW.
  • the types of artificial teeth include resin teeth, porcelain teeth, and metal teeth.
  • a resin tooth made of an acrylic resin such as PMMA is used as a complete denture because of its good adhesion to the resin floor and appropriate hardness.
  • PMMA resin teeth are manufactured by a high-pressure polymerization method, and have a higher hardness and a lower water absorption rate than PMMA resin beds.
  • the artificial teeth 18 and the artificial teeth 22 are classified into anterior teeth and molar teeth.
  • artificial teeth of various sizes, colors, and forms (for example, round shape, square shape, and oval shape) are commercially available so that they can be selected according to the patient's preference when preparing the denture.
  • an artificial tooth arrangement is performed mainly in consideration of aesthetics and a sound generation function (for example, sound generation in a row).
  • a sound generation function for example, sound generation in a row
  • the molar part artificial tooth arrangement is performed mainly in consideration of the stability of the denture and the masticatory function.
  • the artificial teeth 18 and the artificial teeth 22 may be resin teeth made of PE-UHMW.
  • PE-UHMW resin teeth like the PE-UHMW resin floor, have a low water absorption rate and excellent antifouling performance.
  • the resin teeth and the resin bed made of the same material are easily bonded.
  • the artificial tooth made of PE-UHMW can be formed integrally with the denture base by cutting a molded product of PE-UHMW.
  • integrally forming the artificial tooth and the denture base the bonding itself between the artificial tooth and the denture base becomes unnecessary, and the durability as a base denture is further improved.
  • the denture base 16 and the denture base 20 are colored in a color tone close to gingiva, and the artificial teeth 18 and the artificial teeth 22 are colored in a color tone close to natural teeth.
  • FIG. 4 is a cross-sectional view showing a state where the artificial tooth is bonded to the denture base.
  • the surface of the occlusal surface 20A of the denture base 20 is modified, and a surface modified portion 20C is formed in the vicinity of the occlusal surface 20A.
  • the artificial tooth 22 is bonded to the surface modified portion 20 ⁇ / b> C of the denture base 20 through an adhesive 36.
  • a dental adhesive resin cement such as 4-META / MMA-TBB resin can be used.
  • 4-META / MMA-TBB resin is a catalyst containing tri-n-butylborane (TBB) as a polymerization initiator in methyl methacrylate (MMA) in which 4-methacryloxyethyl trimellitic anhydride (4-META) is dissolved. It is a polymerizable adhesive that polymerizes MMA monomer by adding (catalyst) and mixing with polymethylmethacrylate (PMMA). For example, Sun Medical's “Super Bond” is known.
  • FIG. 5A and FIG. 5B are process diagrams for explaining an adhesion process between an artificial tooth and a denture base.
  • the surface of the occlusal surface 20A of the denture base 20 is modified to form a surface modified portion 20C in the vicinity of the occlusal surface 20A.
  • the surface modification of the denture base 20 is performed because the surface of PE-UHMW that constitutes the denture base 20 is hydrophobic (nonpolar) and has low adhesion to the PMMA that constitutes the artificial tooth 22.
  • an adhesive 36 ⁇ / b> A is applied to the surface of the surface modified portion 20 ⁇ / b> C of the denture base 20.
  • the artificial tooth 22 is positioned and placed on the denture base 20, and the artificial tooth 22 is brought into close contact with the surface modified portion 20C by the adhesive 36A, thereby fixing the artificial tooth 22 on the denture base 20.
  • the adhesion structure shown in FIG. 4 is completed.
  • the artificial tooth 18 made of PMMA can be fixed on the denture base 16 made of PE-UHMW.
  • the surface modification method of PE-UHMW (molded product) applied to the surface modification of the denture base 16 and the denture base 20 will be described.
  • the surface modification of PE-UHMW is performed in three steps: (1) an impregnation treatment step for impregnating the impregnating agent, (2) an activation treatment step for introducing a hydrophilic group, and (3) a step for grafting the monomer. Done.
  • each of the steps (1) to (3) will be described.
  • Impregnation treatment is a method in which a compound having affinity for PE-UHMW is brought into contact with the surface of PE-UHMW at a temperature below the softening point of PE-UHMW, and the above compound is brought into contact with the surface of PE-UHMW. Is impregnated.
  • the compound to be impregnated is called an impregnating agent.
  • the impregnating agent may be used in the state of a solution or a dispersion.
  • an organic solvent such as toluene, xylene, ⁇ -chloronaphthalene, dichlorobenzene, decahydronaphthalene or the like can be used.
  • a solution obtained by dissolving orthohydroxybiphenyl (solid at room temperature) in an organic solvent such as methanol can be used as the impregnating agent.
  • the impregnating agent soaks into the non-crystalline region of PE-UHMW to form a gap inside the molded product.
  • the surface of PE-UHMW is not substantially altered. For example, even when an organic solvent is used as the impregnating agent, PE-UHMW does not dissolve in the organic solvent.
  • the impregnation treatment has an effect of facilitating the next activation treatment, grafting treatment, and the like.
  • a preferred range of the impregnating amount of the impregnating agent with respect to PE-UHMW is shown by a weight increase rate.
  • the thickness of PE-UHMW is less than 100 ⁇ m, it is 0.1 to 40% by weight.
  • the thickness of PE-UHMW is 100 ⁇ m or more, it is 0.1 to 40% by weight with respect to a portion within a depth of 100 ⁇ m from the surface of PE-UHMW.
  • the impregnation amount is about 0.1 to 10% by weight for convenience.
  • the conditions such as the time and temperature of the impregnation treatment are appropriately selected according to the shape of the object to be treated so that the impregnation amount of the impregnating agent falls within the above preferable range.
  • the PE-UHMW molded product is sprinkled with a centrifugal dehydrator after being immersed in an impregnating agent at room temperature to 70 ° C. for about 5 to 30 minutes.
  • the impregnating agent is removed to some extent and the surface is apparently dried, the impregnation process is terminated.
  • the PE-UHMW molded product may be dried using a dryer. The remaining impregnating agent is removed by washing performed after the subsequent activation treatment step and grafting step.
  • the activation treatment is a treatment for introducing a hydrophilic group such as a carbonyl group into the surface of PE-UHMW.
  • the hydrophilic group is not limited to a carbonyl group.
  • a functional group containing oxygen or nitrogen such as a hydroxyl group, a carboxyl group, or an amino group, or an unsaturated bond may be introduced.
  • various treatments such as plasma treatment, ozone treatment, ultraviolet irradiation treatment, corona discharge treatment, and high-pressure discharge treatment can be exemplified. In the case where the entire surface is activated, ozone treatment without irradiation with electromagnetic waves is preferable.
  • the degree of the activation treatment is adjusted as appropriate so as not to impair the strength of PE-UHMW.
  • a hydrophilic group such as a carbonyl group has been introduced.
  • the carbonyl group has an absorption based on a C ⁇ O bond in the vicinity of 1710 cm ⁇ 1 of the infrared absorption spectrum (IR). Therefore, when a carbonyl group is introduced, the absorbance around 1710 cm ⁇ 1 on the surface of PE-UHMW is observed by IR.
  • the absorbance near 1710 cm ⁇ 1 has increased by 1% to 2% compared to the absorbance before the treatment, it is sufficient to terminate the activation treatment, assuming that the introduction of the carbonyl group has been confirmed.
  • Grafting Grafting is a process in which a hydrophilic monomer (monomer) is graft-polymerized on the surface of PE-UHMW that has been subjected to pretreatment (impregnation treatment and activation treatment).
  • a hydrophilic monomer acrylic acid or methacrylic acid can be used.
  • a reaction vessel is filled with a solution containing monomer and a polymerization initiator, or monomer vapor.
  • a water-soluble polymerization initiator such as dicerium ammonium nitrate (IV) or potassium persulfate is preferably used.
  • PE-UHMW is placed in this reaction vessel, and the inside of the vessel is heated to the reaction temperature to perform graft polymerization.
  • PE-UHMW is placed in this reaction vessel, and the surface of PE-UHMW is irradiated with ultraviolet rays to carry out photografting polymerization.
  • a solution containing a monomer or the like is applied to a portion to be surface-modified, and graft polymerization is performed by heating or ultraviolet irradiation.
  • PE-UHMW is washed with a washing device to remove remaining impregnating agent, unreacted monomer, solvent and the like.
  • a solvent that dissolves the impregnating agent, monomer, and solvent but does not dissolve PE-UHMW is used.
  • a cleaning method such as flowing liquid cleaning, immersion cleaning, or spray cleaning can be used as appropriate. If necessary, heat cleaning or ultrasonic cleaning may be performed.
  • the PE-UHMW is subjected to a centrifugal dehydrator to remove liquid components, and the PE-UHMW is dried to a predetermined level using a dryer.
  • the denture (old denture) currently used by the patient is examined. As a result of the examination, the old complete denture is corrected as necessary.
  • the old denture is corrected by correcting the shape of the mucosal surface of the upper and lower denture base.
  • the modification of the mucosal surface of the denture base made of PMMA can be performed using a mucosal conditioner called a tissue conditioner.
  • tissue conditioning a mucosal conditioner
  • PMMA resin is added to the deficient portion, and excess PMMA resin is removed by polishing or the like. This also corrects the occlusal height.
  • the mucosal surface shape and occlusal height can be corrected by changing the denture base instead of using the mucosa adjusting material. Further, for example, when a new denture is necessary because the old denture has been broken, it is sufficient to simply bond the broken old denture. Therefore, it is not necessary to modify the form of the mucosa and the occlusal height.
  • the mucosa-adjusting material it is preferable to use a mucosa-adjusting material containing a radiopaque substance such as barium.
  • a mucosa-adjusting material containing a radiopaque substance such as barium.
  • the corrected CT image data of the old denture can be obtained with high accuracy in the CT imaging of the next step.
  • the "mandibular denture 14" can be produced using the same method.
  • CT imaging is performed by fixing and arranging the old complete dentures modified using a mucosa-adjusting material containing an X-ray impermeable substance at the imaging position of the X-ray CT apparatus.
  • CT imaging data of the acquired old complete denture is acquired.
  • CT is an abbreviation for computed tomography.
  • the X-ray CT apparatus obtains CT imaging data by imaging an imaging apparatus that performs CT imaging using X-rays, and controlling each part of the imaging apparatus and imaging distribution data such as X-ray absorption values obtained by CT imaging. And a computer system.
  • a dental X-ray CT apparatus As a dental X-ray CT apparatus, an X-ray CT diagnostic apparatus “Fine Cube” manufactured by Yoshida Seisakusho can be used.
  • a dental X-ray CT apparatus is provided with a head fixing device that fixes a patient's head while CT is performed. By this head fixing device, the patient's head is fixed to the imaging device.
  • the imaging apparatus includes an X-ray irradiation unit that irradiates an X-ray cone beam and an X-ray detection unit that detects transmitted X-rays.
  • the X-ray irradiation unit and the X-ray detection unit are arranged so as to face each other with the fixed patient's head interposed therebetween.
  • CT imaging of the head is performed by the imaging device making one rotation around the patient's head.
  • the above-mentioned head fixing device can perform CT imaging by fixing and arranging the corrected old complete denture at the imaging position.
  • the computer (system) will be described as including a CPU, a ROM, a RAM, a memory such as a hard disk, a data input device such as a hard disk drive, an input device such as a mouse and a keyboard, and a display device such as a display. .
  • Recent X-ray CT apparatuses are equipped with image processing software for performing image reconstruction processing in the same manner as the X-ray CT diagnostic apparatus “Fine Cube”.
  • Three-dimensional image data (volume data) and tomographic image data (slice data) can be acquired by image reconstruction processing of CT imaging data.
  • the acquired image data can be preserve
  • DICOM is a medical image and communication standard.
  • DICOM format image data can be displayed by using a DICOM viewer which is browsing software. That is, by using a computer equipped with a DICOM viewer by providing compatibility by standardizing in an image format, CT imaging is performed on a display device (hereinafter referred to as “display”) connected to the computer. Various types of images such as images, three-dimensional images, and tomographic images can be displayed. Various diagnoses can be performed using these display images.
  • FIG. 6 is a three-dimensional image obtained from CT imaging data obtained by CT imaging of the head of a patient wearing a complete denture.
  • a dental X-ray CT apparatus is usually used to acquire such a three-dimensional image.
  • an image 38 representing the three-dimensional shape of the patient's skeleton 38A, maxillary denture 38B, and mandibular denture 38C is displayed. Further, by designating the spatial position coordinates of the cross section 38D, a tomographic image obtained by cutting the cross section 38D can be displayed.
  • FIG. 7 is a three-dimensional image of the maxillary denture obtained from CT imaging data when the modified maxillary denture is fixedly arranged at the imaging position and CT imaging is performed.
  • an image 40 representing the three-dimensional shape of the upper denture 40A is displayed on the display.
  • the fixed old denture is fixedly placed at the imaging position without being attached to the patient, CT imaging is performed, and the CT image data of the corrected old complete denture is directly acquired, so that the three-dimensional image shown in FIG. 6 can be obtained. It is possible to save the trouble of image processing such as erasing the skeleton and unnecessary parts.
  • the patient does not have to be irradiated with X-rays.
  • a three-dimensional image can be obtained not only from CT imaging data obtained by CT imaging but also by MRI (magnetic resonance imaging). Since MRI uses radiography, it is superior in that it does not cause any harm to the human body compared to X-rays. Therefore, if MRI imaging is performed with the modified old complete denture attached to the patient, MRI imaging data can be acquired safely while being attached to the patient.
  • MRI magnetic resonance imaging
  • FIG. 8 is a photographic image (two-dimensional image) of an artificial tooth.
  • the artificial teeth 18 and the artificial teeth 22 are resin teeth made of PMMA acrylic resin.
  • the artificial teeth 18 and the artificial teeth 22 are marketed separately for the front teeth and the molars.
  • FIG. 8A is a photographic image of an anterior artificial tooth
  • FIG. 8B is a photographic image of a molar artificial tooth. If there is already data that can display a three-dimensional image of the artificial tooth, it is not necessary to acquire imaging data.
  • three-dimensional image data and tomographic image data can be acquired by image reconstruction processing of CT imaging data. Further, the acquired image data can be stored in the DICOM format. In addition, various types of images such as a CT image, a three-dimensional image, and a tomographic image can be displayed on the display using the DICOM viewer.
  • FIG. 9A and FIG. 9B are three-dimensional images obtained from CT imaging data when CT imaging of the artificial tooth is performed.
  • an image 42A representing the three-dimensional shape of the anterior artificial tooth is displayed on the display.
  • an image 42B representing the three-dimensional shape of the molar prosthesis is displayed on the display.
  • CAD is an abbreviation for computer-aided design.
  • CAA manufactured by Dassault Systèmes may be used.
  • CAA is general-purpose three-dimensional CAD software.
  • the three-dimensional shape of the gypsum model obtained in the step (4) of the conventional manufacturing method was measured by a contact type or a non-contact type to obtain an optical impression.
  • Non-contact measurement includes a method of obtaining an optical impression by measuring using laser light and a method of obtaining an optical impression from a plurality of captured images by a CCD camera.
  • three-dimensional shape measurement data is obtained not from the measurement data of the gypsum model but from the CT imaging data of the modified old complete denture and artificial teeth. According to CT imaging, a three-dimensional shape can be measured in a short time.
  • the 3D CAD software is started on the computer, and the modified CT image data of the old denture and the CT image data of the artificial tooth are taken in and converted into 3D image data for CAD.
  • a virtual space (three-dimensional image) created by the computer is displayed on the screen of a display connected to the computer. In this virtual space, the measurement data of the three-dimensional shape of the old complete denture is corrected, and the three-dimensional shape model of the new complete denture 10 is designed.
  • FIG. 10 is a diagram showing how a three-dimensional shape model of a new complete denture is designed.
  • an image 44 representing the three-dimensional shape of the modified old complete denture 44A is displayed on the display.
  • the artificial teeth 44C that need to be rearranged are removed from the three-dimensional shape of the old complete denture 44A.
  • Artificial tooth arrangement is performed on the denture base 44B displayed in the virtual space using an image (colored portion of the drawing) representing the three-dimensional shape of the artificial tooth 18.
  • the new artificial tooth 18 is replaced with the artificial tooth 44C of the old denture while performing simulation so that the occlusal plane height and the occlusal relationship are in an appropriate state with reference to the CT imaging data in the virtual space.
  • the denture base 44B Are rearranged in the denture base 44B.
  • FIG. 11 is a diagram showing an image 46 of the three-dimensional shape model of the new complete denture.
  • the three-dimensional shape model 46A of the new complete denture 10 is completed in the virtual space.
  • the three-dimensional shape model 46A of the new complete denture 10 is composed of a three-dimensional shape model 46B of a denture base and a three-dimensional shape model 46C of an artificial tooth.
  • the shape data of the three-dimensional shape model 46A of the new complete denture 10 is stored in the memory as master data.
  • FIG. 12 is a view showing an image 48 of a three-dimensional shape model of the denture base of the new complete denture.
  • the artificial tooth is removed from the three-dimensional shape model of the new complete denture 10 using the three-dimensional CAD software, and the three-dimensional shape model 48A of the denture base is designed.
  • the artificial teeth arranged on the occlusal surface 48B side are removed, and a plurality of recesses 48C are formed in the traces after the artificial teeth are removed.
  • the shape data of the three-dimensional shape model 48A of the denture base is stored in the memory in association with the master data.
  • the machining center is a computerized numerical control (CNC) facility that automatically processes products using a wide variety of cutting tools.
  • CNC computerized numerical control
  • a 5-axis control machining center “VARIAXIS 200” manufactured by Yamazaki Mazak Co., Ltd. can be used as the machining center.
  • VARIAXIS 200 manufactured by Yamazaki Mazak Co., Ltd.
  • a 5-axis control machining center By using a 5-axis control machining center, a complex curved surface can be machined while simultaneously controlling 5 axes (X axis, Y axis, Z axis, and tool posture) of the machine tool.
  • FIG. 13A and FIG. 13B are views showing how a denture base is produced.
  • FIG. 13B is a partially enlarged view of FIG. 13A.
  • a block 50 of ultra high molecular weight polyethylene (PE-UHMW) is cut based on NC data, and a denture base 16T for maxillary denture made of PE-UHMW is produced. That is, the denture base 16T is cut out from the PE-UHMW block 50.
  • PE-UHMW ultra high molecular weight polyethylene
  • the PE-UHMW block 50 is an uncolored resin block, and an uncolored denture base 16T is obtained from the PE-UHMW block 50.
  • a plurality of recesses 16T ⁇ for arranging the artificial teeth 18 are formed on the mucosal surface side of the denture base 16T.
  • the denture base 16T and the PE-UHMW block 50 are connected in order to make it easier to see how the denture base 16T is cut out from the PE-UHMW block 50.
  • the denture base 16T and the block 50 are separated at the stage where the cutting is completed.
  • FIGS. 14A and 14B are views showing a state in which an artificial tooth is attached to a denture base.
  • FIG. 14B is a partially enlarged view of FIG. 14A.
  • the artificial tooth 18 is attached to the uncolored denture base 16T.
  • the denture base 16T of the maxillary denture 12T is colored gingival color to complete the maxillary denture 12 which is a part of the new complete denture 10.
  • the master data stored in the memory is read, and an image of the three-dimensional shape model of the new complete denture 10 is displayed on the display. While referring to the artificial tooth arrangement of the displayed image, the artificial teeth 18 are temporarily arranged on the uncolored denture base 16T. Since each of the plurality of recesses 16T ⁇ is formed so as to match the shape of the artificial tooth 18 to be arranged, the suitability can be confirmed by provisional arrangement. The temporarily arranged artificial teeth 18 made of PMMA are removed.
  • a denture base 16T made of PE-UHMW is immersed in toluene heated to 70 ° C. for 15 minutes, and the surface of the denture base 16T is impregnated with toluene (impregnating agent).
  • the denture base 16T is rinsed lightly with methanol, and then the excess impregnating agent on the surface is wiped off with paper and left to dry at room temperature for 5 minutes.
  • the surface of the denture base 16T is activated by ozone treatment.
  • the impregnated denture base 16T is placed in a reaction vessel made of hard glass.
  • the ozone generated by the ozone generator is introduced into the reaction vessel so that the ozone generation rate is about 1.0 (g / hour), and ozone treatment is performed on the denture base 16T over about 2 hours.
  • the denture base 16T is taken out from the reaction container.
  • grafting is performed on the surface of the denture base 16T that has been treated with ozone.
  • water solubility is obtained by dissolving 1.0 ml of acrylic acid and 20 mg of ceric ammonium nitrate (IV) in 180 ml of water.
  • the ozone-treated denture base 16T is immersed in this aqueous solution.
  • the surface of the denture base 16T is irradiated with ultraviolet rays from a distance of 20 cm.
  • photografting polymerization is performed by irradiating with ultraviolet rays for 2 hours.
  • the denture base 16T is taken out from the reaction container.
  • the grafted denture base 16T is immersed in a cleaning device (immersion container) filled with a 60 ° C. detergent aqueous solution. After performing immersion cleaning at 60 ° C. for 10 minutes, further cleaning with running water is performed to remove unreacted monomers and the like. Further, the water is removed through a centrifugal dehydrator and dried to a predetermined degree. Thereby, the surface of the denture base 16T is hydrophilized and can be bonded to the acrylic resin. Moreover, it becomes possible to color by impregnating dyes and pigments.
  • the artificial tooth 18 is rearranged as it is temporarily arranged, and is closely attached to each of the recesses 16T ⁇ whose surface has been modified with an uncured adhesive.
  • “Superbond” is a dental adhesive that can be used in the oral cavity, and polymerizes when a polymer is added to a monomer to which a catalyst containing a polymerization initiator is added, as described above.
  • the adhesive is polymerized to fix the artificial tooth 18 on the denture base 16T.
  • the surface of the denture base 16T whose surface has been modified is impregnated with a coloring material from the surface layer to the inside to color the denture base 16T in a gingival color.
  • a coloring material from the surface layer to the inside to color the denture base 16T in a gingival color.
  • the maxillary denture 12 of the new complete denture 10 is completed.
  • the lower denture 14 of the new complete denture 10 can be produced using the same method.
  • iron oxide (red) and titanium oxide (white) are mixed at an appropriate ratio and used as a coloring material.
  • As a color material for coloring the denture base 16T commercially available red color materials and white color materials suitable for PE-UHMW can be used by appropriately mixing them. Further, as described above, it is preferable that the color material has excellent biocompatibility.
  • step (4) a plurality of three-dimensional shape models 46A of the new complete denture 10 can be prepared. Depending on the 3D shape model of a plurality of new dentures 10, create multiple trial dentures by rapid prototyping, etc., and select the 3D shape model of the new denture 10 that best fits the patient after trying them. Then, based on the selected three-dimensional shape model, steps (5) to (7) can be performed to produce a new complete denture 10 having a denture base made of PE-UHMW.
  • step (5) is omitted, and in step (6), a tool path is calculated from the shape data (master data) of the three-dimensional shape model 46A of the new complete denture 10 obtained in step (4).
  • the calculated value is converted into NC data).
  • the generated NC data is transmitted to the machining center.
  • a transparent PE-UHMW block is cut to produce an upper denture having a PE-UHMW artificial tooth and a denture base. That is, the upper denture integrally formed with transparent PE-UHMW is cut out from the PE-UHMW block.
  • ⁇ Installation of artificial teeth in step (7) is not necessary.
  • the surface of the entire surface of PE-UHMW is modified in the same manner as in step (7), and the surface modified surface is impregnated with the dye from the surface layer to the inner portion, so that the upper denture Is colored.
  • the denture base of the upper denture is colored in a color tone close to gingiva, and the artificial tooth is colored in a color tone close to natural teeth.
  • the maxillary denture of the total PE-UHMW is completed.
  • a similar method can be used to make a total PE-UHMW mandibular denture.
  • step (6) a block of polymethyl methacrylate (PMMA) is cut and the denture base is cut out.
  • PMMA polymethyl methacrylate
  • the PE-UHMW molding is cut and the artificial teeth and denture base are integrally formed with PE-UHMW.
  • a denture base or an integrally formed product of an artificial tooth and a denture base can be formed not by cutting a resin molding, but by resin lamination, stereolithography, or the like.
  • various thermoplastic resins and thermosetting resins can be used.
  • ABS resin, polyacetal resin, fluorine resin, and the like can be used.
  • a fluororesin is used, excellent antifouling performance can be obtained.
  • the complete denture preparation process can be greatly simplified compared to the conventional production method, and a complete denture is produced in a short period of time. be able to.
  • the number of visits of the patient can be reduced compared to the conventional manufacturing method, and the burden on both the dentist and the patient can be reduced.
  • the modification of the old complete denture is performed by correcting the shape of the mucosal surface of the denture base (tissue conditioning) using a mucous membrane adjusting material.
  • tissue conditioning tissue conditioning
  • a mucous membrane adjusting material By designing a new three-dimensional shape model of the new complete denture based on the modified measurement data of the three-dimensional shape of the old complete denture, the CAD design error is reduced and CAD / CAM technology is applied.
  • CAD / CAM technology is applied.
  • a three-dimensional shape model of a new complete denture by CAD when designing a three-dimensional shape model of a new complete denture by CAD, it is not the measurement data of the gypsum model by an optical measurement device or the like by laser irradiation, but the modified old complete denture and artificial teeth.
  • Three-dimensional shape measurement data is obtained from CT imaging data. According to CT imaging, a three-dimensional shape can be measured in a short time. In addition, measurement accuracy is improved by CT imaging, and the accuracy of preparing a denture base by CAD / CAM can be dramatically improved.
  • a block of ultra high molecular weight polyethylene (PE-UHMW) is cut by an NC machine tool, and a denture base for upper denture made of PE-UHMW is cut out. Therefore, unlike the conventional PMMA denture base molded by injection molding using a plaster mold, the denture base can be produced with high accuracy without contraction during molding.
  • the manufacturing method of the present embodiment applying the CAD / CAM technology is the most suitable method for manufacturing a denture base, whether it is a denture base made of PE-UHMW or a denture base made of PMMA. It can be said.
  • PE-UHMW ultra high molecular weight polyethylene
  • the dirt performance can be increased. Therefore, when PE-UHMW is used as a material, it can be manufactured by other known manufacturing methods as long as a denture having a denture base made of PE-UHMW can be manufactured. For example, when designing a three-dimensional shape model of a new complete denture by CAD, measurement data of a plaster model may be used.
  • Example 1 For ultra high molecular weight polyethylene (PE-UHMW) used as a denture base resin of the present invention, a rectangular parallelepiped test piece of 5 mm ⁇ 10 mm ⁇ 2 mm was prepared. The test piece was cut out from a product name “Chirlen” molded product manufactured by Quadland EP (EPP) Japan. The weight average molecular weight of PE-UHMW is about 5 million, and the test piece is formed by compression molding. Using the prepared test piece, the antifouling performance was evaluated by the method described later. The results are shown in FIG.
  • PE-UHMW ultra high molecular weight polyethylene
  • Example 1 A plate-shaped test piece of 5 mm ⁇ 10 mm ⁇ 2 mm was prepared for polymethyl methacrylate (PMMA) used as a conventional denture base resin.
  • the test piece was produced by injection molding using the trade name “Acron” manufactured by GC (GC). Using the prepared test piece, the antifouling performance was evaluated by the method described later. The results are shown in FIG.
  • the antifouling performance of each test piece was evaluated by a coloring test by immersion in a curry solution.
  • a curry solution in which 10 g of curry powder was dissolved in 50 ml of distilled water was used.
  • curry powder “S & B spicy curry powder” manufactured by Sakai Subs Foods Co., Ltd. was used.
  • Example 1 Each of the test pieces prepared in Example 1 and Comparative Example 1 was immersed in the curry solution at room temperature for 90 hours, and washed after the curry solution was immersed. There were two types of washing conditions: running water washing and immersion washing with dishwashing detergent.
  • dishwashing detergent a kitchen detergent “Joy” manufactured by Procter & Gamble Japan was used and immersed in a 0.5% by weight aqueous solution for 1 hour for immersion cleaning.
  • each of the test pieces prepared in Example 1 and Comparative Example 1 was immersed in the above curry solution at room temperature for 216 hours, and after the curry solution was immersed, it was cleaned with a denture cleaner.
  • Denture cleaning agent “Tough Dent” manufactured by Kobayashi Pharmaceutical Co., Ltd. was used as the cleaning agent, and the test piece was immersed for 22 hours in an aqueous solution in which 1 tablet of “Tough Dent” was dissolved in 150 ml of water according to the method of use, followed by immersion cleaning.
  • the color difference ⁇ E of the test piece before and after immersion (washing) was measured with a color difference meter.
  • white paper was placed behind the test piece to replace the standard white board.
  • color difference meter “color reader CR-13” manufactured by Konica Minolta was used.
  • the color difference ⁇ E represents the distance between two points on the color space coordinates when the color of the test piece before and after immersion is coordinated as two points on the color space coordinates by the L * a * b * color system. The larger the value of the color difference ⁇ E, the greater the degree of coloring.
  • FIG. 15 is a graph showing the evaluation results of the antifouling performance of each test piece.
  • ⁇ E 18.3660012 for the PMMA test piece according to Comparative Example 1
  • ⁇ E 18E for the PE-UHMW test piece according to Example 1. 10.48236615.
  • the value of ⁇ E is smaller than that of the test piece according to Comparative Example 1, and the coloring degree is significantly reduced to about 60% of the comparative example. That is, it can be seen that the test piece according to Example 1 can be easily removed by washing with water, and the dirt itself is difficult to adhere.
  • the value of ⁇ E is smaller than that of the test piece according to Comparative Example 1, and the coloring degree is significantly reduced to about 30% of the comparative example. That is, it can be seen that the test piece according to Example 1 is not easily soiled and can be easily removed with dishwashing detergent even if the soil is attached.
  • ⁇ E 2.071231518.
  • the value of ⁇ E is smaller than that of the test piece according to Comparative Example 1, and the coloring degree is significantly reduced to about 20% of the comparative example.
  • the test piece according to Example 1 is not easily soiled and can be easily removed with a denture cleaning agent even if the soil adheres.
  • the PE-UHMW test piece according to Example 1 was washed with water compared to the PMMA test piece according to Comparative Example 1. It can be easily removed and the dirt itself is difficult to adhere. Moreover, even if dirt adheres, it turns out that dirt can be easily removed with the detergent for tableware or the detergent for dentures.
  • the antifouling performance of each test piece was evaluated by a coloring test by immersion in a curry solution.
  • the denture coloring by the curry solution corresponds to the protein adhering to the denture surface. If protein adheres to the denture surface, coloring substances and bacteria will further adhere to the denture surface, leading to bacterial growth in the oral cavity. That is, the above-described evaluation results of the antifouling performance indicate that the resin floor and the denture made of PE-UHMW are not only excellent in antifouling properties but also excellent in antibacterial properties.
  • resin bases and dentures made of PE-UHMW which have high impact strength and bending strength, are less likely to be damaged when subjected to impacts such as dropping compared to PMMA resin base dentures.
  • the resin floor and the denture made of PE-UHMW are difficult to be soiled and hardly damaged.
  • a denture with a resin floor made of PE-UHMW and a denture made of PE-UHMW exhibit excellent durability.

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