WO2014158012A1 - Couronne dentaire en céramique contenant plusieurs couches - Google Patents

Couronne dentaire en céramique contenant plusieurs couches Download PDF

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Publication number
WO2014158012A1
WO2014158012A1 PCT/MY2014/000045 MY2014000045W WO2014158012A1 WO 2014158012 A1 WO2014158012 A1 WO 2014158012A1 MY 2014000045 W MY2014000045 W MY 2014000045W WO 2014158012 A1 WO2014158012 A1 WO 2014158012A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
zirconia
ceramic
porcelain
alumina
Prior art date
Application number
PCT/MY2014/000045
Other languages
English (en)
Other versions
WO2014158012A8 (fr
Inventor
Abdul Razak ABDUL AZIZ
Abdul Shukor MOHD HAMDI
Ali ABDULLAH ALWAN AL-MAQTARI
Original Assignee
Universiti Malaya
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Universiti Malaya filed Critical Universiti Malaya
Publication of WO2014158012A1 publication Critical patent/WO2014158012A1/fr
Publication of WO2014158012A8 publication Critical patent/WO2014158012A8/fr

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Classifications

    • 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
    • A61C13/083—Porcelain or ceramic teeth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/70—Tooth crowns; Making thereof
    • A61C5/73—Composite crowns
    • 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
    • A61C13/09—Composite teeth, e.g. front and back section; Multilayer teeth
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/70—Tooth crowns; Making thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/70—Tooth crowns; Making thereof
    • A61C5/77—Methods or devices for making crowns
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/15—Compositions characterised by their physical properties
    • A61K6/16—Refractive index
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/20—Protective coatings for natural or artificial teeth, e.g. sealings, dye coatings or varnish
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K6/00—Preparations for dentistry
    • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
    • A61K6/802—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics
    • A61K6/818—Preparations for artificial teeth, for filling teeth or for capping teeth comprising ceramics comprising zirconium oxide

Definitions

  • the present invention relates to the field of dental restorations. More particularly, the present invention relates to a multi-layered dental ceramic crown having improved physical properties.
  • Ceramics are attractive materials for use in dental crown restorations because of their aesthetics, inertness, and biocompatibility. But all ceramics are brittle, to a greater or lesser extent, and tend to fail beyond a critical load or lifetime. However, the failure rate of posterior all-ceramic crowns is reported as 3% to 4% each year (Conrad et al., 2007; Rekow and Thompson, 2007; Chevalier and Gremillard, 2009; Denry et al., 2010; Ho et al., 201 1 ; Silva et al., 2012), despite recent significant improvement in dental ceramic strength (i.e. high strength alumina and zirconia cores).
  • the main clinical failure mode is the subsurface radial crack in the ceramic, at the interface between the crown (dental ceramic) and cement. This failure rate is caused largely by the tensile stress concentration in the dental ceramic at that interface. It is, therefore, advantageous to explore efficient methods for the reduction of stress at this interface.
  • Dental multilayer is a widely recognized engineering idealization of dental crowns. It mimics the layered structure of the crown on a real tooth. To understand the fundamental mechanics of failure in dental ceramics on soft dentin-like underlayers under conditions that simulate basic occlusal function, a proper foundation can be laid for rational materials design of future multilayer crown structures. In the dental field, a tooth and a bone are mainly important subjects and have very complicated structure.
  • FGM functionally graded materials
  • the main clinical failure mode is the subsurface radial crack in the ceramic, at the interface between the crown (dental ceramic) and cement. This failure rate is caused largely by the tensile stress concentration in the dental ceramic at that interface.
  • Layered all-ceramic crowns have become widely used since the introduction of strong alumina and zirconia cores and the availability of computer-aided design/computer-aided manufacturing (CAD/CAM) milling techniques, but problems related to flaws in ceramics, which originates from its inherent brittleness and results in the unreliability in strength, has led to the development of techniques to hinder these cracks to grow, and, as a result, an increase in strength.
  • a possible solution is a concept of functionally graded materials (FGM). To prolong the longevity of a ceramic restoration, it is important to address the question of how to achieve microstructural refined dental ceramic to reduce or preferably to avoid the size and number of cracks and flaws.
  • a coating for a dental crown which is composed of zirconia based ceramics and alumina based ceramics used as a first and second ceramic core layer, and a porcelain based veneer.
  • an apparatus comprising:
  • a first ceramic layer comprising zirconia
  • a second ceramic layer comprising zirconia and alumina that is attached to the first ceramic layer, the second ceramic layer comprising 50 to 80% zirconia and 20 to 50% alumina;
  • the apparatus can be a crown for a tooth.
  • a method of manufacturing a dental crown which comprises the steps of: i. forming a zirconia vapour that solidifies to form a zirconia layer;
  • the porcelain can be fired to form a dental crown or other device.
  • Fig. 1 is a cross-sectional view of a person's tooth, including a prosthetic crown
  • Fig. 2 illustrates contour plots of the Von Mises stress distribution of all tooth models
  • Fig. 3 illustrates Von Mises stress distribution within the tooth and veneer-core- cement of all tooth models
  • Fig. 4 is a graph that illustrates the Von Mises stress of the cement in all models
  • Fig. 5 is illustrates shear stress distribution interface between veneer-core- cement-dentin
  • Fig. 6 is a graph that illustrates the von Mises stress of the veneer in all tooth models
  • Fig. 7 is a graph that illustrates the von Mises stress of the ceramic cores in all models
  • Fig. 8 is a graph that illustrates the vonMises stress of the dentin in all tooth models
  • Fig. 9 is a graph that illustrates the shear stress between the veneer and ceramic core interfaces in all tooth models.
  • Fig. 10 is a graph that illustrates stress between the ceramic core and the cement interfaces in all tooth models. DETAILED DESCRIPTION OF THE INVENTION
  • FIG. 1 A cross-sectional view of a person's tooth 100 is shown in Fig. 1.
  • the tooth 100 has a crown 102 including a porcelain veneer 104 that is attached to a ceramic core.
  • the ceramic core includes a first layer 106 consisting of zirconia disposed on a second layer 108 consisting of zirconia and alumina.
  • the ceramic core is bonded with a cement layer 110 to a stub of the tooth 100, the stub having been machined by a dentist to prepare for attachment of the crown 102.
  • the second layer of the ceramic core is comprised with 80% zirconia and 20% alumina, by weight of the second layer.
  • the second layer of the ceramic core is comprised with 60% zirconia and 40% alumina, by weight of the second layer.
  • the second layer of the ceramic core is comprised with 50% zirconia and 50% alumina, by weight of the second layer.
  • Multi-layered ceramic cores were prepared using a powder metallurgy method.
  • the particle size of zirconia and alumina was 5 pm and 10 ⁇ , respectively.
  • the process of metallurgy powder was divided into the following steps: i. Drying of powder
  • the raw powders were thoroughly blended together to ensure maximum particles dispersion for optimal mechanical properties.
  • the benefits of the blending are to reduce the particle size and to obtain a more homogenous shaped particle.
  • the blending process of raw powders was achieved by using a planetary ball mill machine (Retsch 200, Germany) filled with 40 zirconia ceramic balls of 10 mm in diameter (weight 100 g). The blending process was carried out at 400 rpm with reverse action for 10 minutes Powders mixing and milling
  • the powders were poured into a bowl of the ball mill with ethanol and the top was then closed tightly.
  • the Zr0 2 , ⁇ 2 ⁇ 3, ⁇ 2 ⁇ 3, and MgO of various combination powders were then mixed for seven hours.
  • ethanol absolute was poured with the powders, then wet milling and mixing.
  • Customized-made stainless steel compaction die was used to produce the individual graded specimens. Prior to specimens' fabrication, the mould was cleaned using ethanol and cotton tissue to remove any debris to prevent contamination of the specimens. The mould was lubricated using zinc stearate in order to facilitate the removal of specimens easily from the mould after compaction.
  • the desired sintered layer thickness, t was multiplied by the cross-sectional area, A. This will determine the final sintered volume of the layer. This volume was then multiplied by the theoretical density of the powder composition, p/ aye r based on a rule of mixture formulation, to ultimately determine the mass of the powder to be added m/ ay er
  • the prepared specimens were placed into the hot isostatic press machine.
  • the specimens were sintered under flowing inert argon gas and vacuum to prevent oxidation of specimens and under high pressure at 200 MPa and to produce highly densed specimens.
  • Feldspathic porcelain opaque powder was mixed with opaque liquid in a clean glass slab by using a glass rod. This mixing was done on a vibrator to disperse air bubbles. Firstly, a thin wash layer was applied to the porcelain-bearing surface by using a brush and then fired. Secondly, a thin creamy consistency of porcelain powder was applied to the specimen with a brush, and then the hemostat was tapped lightly with a serrated lecron in a vibrating motion to condense the opaque porcelain. Excess opaquing liquid rising to the surface was removed with a thin absorbant tissue paper placed against an edge of the moist opaque porcelain. Excess liquid was blotted away from as many directions as possible until the opaque material took on a dull appearance.
  • the end of the hemostat holding the specimen was exposed to the heat radiating from the porcelain furnace muffle to dry the opaque surface. Then, any dried opaque from non porcelain-bearing areas, such as the lower surface and borders of the metal specimen, was removed using a small stiff-bristle brush. Fourthly, the opaqued porcelain samples were put on a saggar tray and transferred to the middle of the muffle stand for firing according to the manufacturer's instructions.
  • Green compacts were formed from zirconia with/without alumina powder using a hot isostatic press at 200MPa.
  • the green compacts were divided into two groups.
  • monolith YZr02 one group was sintered at 1450°C for 2 hours inside a high temperature box air furnace.
  • graded structures another group was pre-sintered between 1100 and 1400 for 1 hour in air, producing a somewhat porous template for glass infiltration.
  • the top surface of presintered YZr02 was coated with a slurry of porcelain powdered glass composition as mentioned above. Glass infiltration and densification was carried out simultaneously at 1450 ⁇ for 2 hours in air. By this way, the glass infiltration depth can be tailored by manipulating the porosity of the infiltrating structures, and the grain growth.
  • the outer surface of second layer 108 was subject to lining by luting cement and then fixed gently to the dentin 100.
  • the aim of this study was to establish and investigate the mechanical behaviour of the dental crown of the present invention, which comprises: a first ceramic core layer 106 comprising zirconia;
  • a second ceramic core layer 108 comprising zirconia and alumina that is attached to first ceramic core layer, the second ceramic core layer comprising 50 to 80% zirconia and 20 to 50% alumina;
  • the mechanical behaviour includes determination of the stress-strain distribution across the zirconia 106, zirconia-alumina 108 and porcelain veneer 104 interfaces. Particularly, this study focused on the dental ceramic core (zirconia layer 106 and combination of zirconia and alumina layer 108) with different percentages of its compositions and studying the effects of stress-strain distribution on the zirconia layer 106 and combination of zirconia and alumina layer 108.
  • the cement layer 110 that bonds the ceramic core to a stub of the tooth is included in the dentin portion of the tooth due to its very thin structure.
  • a first ceramic core layer 106 consisting of zirconia
  • a second ceramic core layer 108 consisting of zirconia and alumina • a layer of dentin 112, which includes a thin cement layer 110 on its top surface
  • Vi and V2 are Poisson's ratios for the first and second components in each layer.
  • Ei and E ⁇ are the elastic modulus of the first and second components in each layer.
  • h are the volume fractions for the first and second components in each layer.
  • the points were chosen at cervical from buccal and cervical palatal margins of the all parts for all models crown, at the axio-gingival corners, on the midpoint of the buccal and palatal surfaces, and on top of the both cusps with the occlusal surface of the veneer, the ceramic core, the cement, and the dentin along the surface of veneer-ceramic core- cement-dentin interfaces.
  • the stress distribution (Von Mises, maximum stress principal, minimum stress principal, and shear stress) and strain distribution (maximum strain and minimum strain) were investigated in each component and at the veneer-ceramic core- cement-dentin interfaces.
  • the shear stress between the veneer and core interfaces of the graded multilayered (models E-F) was lower than single layer (models A-D) as shown in Figure 5 and Figure 9.
  • the shear stress between the core and cement interfaces of the graded multilayered (models E-F) was lower than single layer (models A-D) as shown in Figure 10.
  • the multi-layered dental crown of the present invention that is composed of a two layer ceramic core (i.e. zirconia first layer and mixture of zirconia and alumina second layer) showed lesser stress levels for veneer- ceramic core-cement-dentin interface than single-layered models.

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dentistry (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Plastic & Reconstructive Surgery (AREA)
  • Dental Prosthetics (AREA)
  • Dental Preparations (AREA)

Abstract

L'invention concerne un revêtement pour une couronne dentaire (102) qui est à la fois esthétique et d'une résistance mécanique excellente, et qui est constitué d'une première couche centrale en céramique à base de zircone et d'une seconde couche centrale en céramique à base d'alumine (106, 108) et d'un vernis à base de porcelaine (104). L'invention concerne également un procédé de fabrication de la couronne.
PCT/MY2014/000045 2013-03-28 2014-03-27 Couronne dentaire en céramique contenant plusieurs couches WO2014158012A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2013001087 2013-03-28
MYPI2013001087A MY170727A (en) 2013-03-28 2013-03-28 A multilayered dental ceramic crown

Publications (2)

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WO2014158012A1 true WO2014158012A1 (fr) 2014-10-02
WO2014158012A8 WO2014158012A8 (fr) 2015-09-17

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WO (1) WO2014158012A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2603715C1 (ru) * 2015-09-08 2016-11-27 Евгений Викторович Васильев Способ изготовления зубного протеза
WO2018137182A1 (fr) * 2017-01-25 2018-08-02 北京大学口腔医院 Dent artificielle, et procédé et dispositif de fabrication de dent artificielle
CN113905686A (zh) * 2019-06-12 2022-01-07 可乐丽则武齿科株式会社 齿套以及齿套的制造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060105297A1 (en) * 2002-12-23 2006-05-18 Nano-Write Corporation Vapor deposited multilayer dental devices
WO2008144388A1 (fr) * 2007-05-16 2008-11-27 University Of Florida Research Foundation, Inc. Système en céramique multicouche destiné à des applications biomédicales et son procédé de fabrication
WO2010119345A1 (fr) * 2009-04-13 2010-10-21 Quanzu Yang Procédé de formation de films en céramique fonctionnels sur des matières céramiques
US7943068B2 (en) * 2000-07-21 2011-05-17 Ivoclar Vivadent, Inc. Method of making a dental restoration
WO2012021442A1 (fr) * 2010-08-11 2012-02-16 3M Innovative Properties Company Couronnes dentaires revêtues et leur procédé de fabrication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7943068B2 (en) * 2000-07-21 2011-05-17 Ivoclar Vivadent, Inc. Method of making a dental restoration
US20060105297A1 (en) * 2002-12-23 2006-05-18 Nano-Write Corporation Vapor deposited multilayer dental devices
WO2008144388A1 (fr) * 2007-05-16 2008-11-27 University Of Florida Research Foundation, Inc. Système en céramique multicouche destiné à des applications biomédicales et son procédé de fabrication
WO2010119345A1 (fr) * 2009-04-13 2010-10-21 Quanzu Yang Procédé de formation de films en céramique fonctionnels sur des matières céramiques
WO2012021442A1 (fr) * 2010-08-11 2012-02-16 3M Innovative Properties Company Couronnes dentaires revêtues et leur procédé de fabrication

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2603715C1 (ru) * 2015-09-08 2016-11-27 Евгений Викторович Васильев Способ изготовления зубного протеза
WO2018137182A1 (fr) * 2017-01-25 2018-08-02 北京大学口腔医院 Dent artificielle, et procédé et dispositif de fabrication de dent artificielle
CN109561952A (zh) * 2017-01-25 2019-04-02 北京大学口腔医学院 义齿、义齿制作方法和装置
CN109561952B (zh) * 2017-01-25 2021-08-17 北京大学口腔医学院 义齿、义齿制作方法和装置
CN113905686A (zh) * 2019-06-12 2022-01-07 可乐丽则武齿科株式会社 齿套以及齿套的制造方法
CN113905686B (zh) * 2019-06-12 2024-02-23 可乐丽则武齿科株式会社 齿套以及齿套的制造方法

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Publication number Publication date
WO2014158012A8 (fr) 2015-09-17
MY170727A (en) 2019-08-27

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