WO2014115090A1 - Procédé de fabrication de tiges endodontique - Google Patents

Procédé de fabrication de tiges endodontique Download PDF

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Publication number
WO2014115090A1
WO2014115090A1 PCT/IB2014/058469 IB2014058469W WO2014115090A1 WO 2014115090 A1 WO2014115090 A1 WO 2014115090A1 IB 2014058469 W IB2014058469 W IB 2014058469W WO 2014115090 A1 WO2014115090 A1 WO 2014115090A1
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WO
WIPO (PCT)
Prior art keywords
block
endodontic
cutter
post
cavity
Prior art date
Application number
PCT/IB2014/058469
Other languages
English (en)
Inventor
Angelo SONAGLIA
Original Assignee
Sonaglia Angelo
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 Sonaglia Angelo filed Critical Sonaglia Angelo
Publication of WO2014115090A1 publication Critical patent/WO2014115090A1/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
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0022—Blanks or green, unfinished dental restoration parts
    • 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
    • A61C13/225—Fastening prostheses in the mouth
    • A61C13/30—Fastening of peg-teeth in the mouth
    • 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
    • A61C13/0004—Computer-assisted sizing or machining of dental prostheses

Definitions

  • the present invention relates to the field of dentistry or dental technology, specifically the methods for manufacturing "customized” posts and the use of such endodontic posts.
  • An endodontically-treated tooth due to a carious lesion or any one degenerative disease, loses part of its physical-chemical-mechanical characteristics.
  • the selection of the post is therefore of fundamental importance because it must stabilize the restoration over the long term, facilitating the integrity and the function thereof over time.
  • the tooth devitalized and reconstructed with a post is considered to be a system composed of multiple separate components glued to each other, in which the forces that affect the tooth tend to be concentrated above all at the level of the interfaces; in such a manner, it is possible to cause a separation of the post, if these forces are greater than the adhesion force, or a fracture of the post, if the post is constituted with insufficiently strong materials, or the breakage of the tooth itself, due to the excessive hardness of the post.
  • the posts used in dentistry can be divided into two large groups:
  • the prefabricated posts can be made of metal, of carbon fibers, quartz fibers or glass fibers.
  • Metallic posts widely used in the past, are extremely strong but due to their excessive hardness (Young's modulus 210 GPa for those made of steel), they have in turn also led to the fracture of the tooth and for this reason in recent years have been increasingly substituted by more flexible posts, such as those formed by carbon fibers (Young's modulus 110 GPa), and above all by those made of glass fibers (Young's modulus 42GPa) or another type.
  • the prefabricated posts made of carbon fiber and glass fibers are immersed in a resin matrix with a modulus of elasticity more similar to that of the dentin (Young's modulus 18.6 GPa).
  • the endodontic posts made of carbon fiber are constituted by a resin matrix, which represents about 36% by weight, in which fibers are immersed with diameter equal to a few microns, such fibers previously subjected to silanization processes.
  • a resin matrix which represents about 36% by weight, in which fibers are immersed with diameter equal to a few microns, such fibers previously subjected to silanization processes.
  • the endodontic posts like all the materials used in the dental field are subjected to the regulations of biological evaluation of medical devices. Such regulations have as objective that of being an overall reference document for the selection of tests that allow being able to evaluate the biological responses in relation to the safety of the devices and the medical materials.
  • the endodontic posts are devices communicating with the outside, with prolonged exposure over time, since they are intended to remain in contact with biological tissues, representing a situation of potential high risk if the material used does not have ideal tolerability characteristics.
  • the results of the tests carried out have shown for all post types that can be found on the market, independent of whether they are metallic or made of plastic polymers, characteristics of cytotoxicity and genotoxicity compatible with clinical use.
  • the clinical selection of the use of one type of endodontic post over another type essentially depends on other factors, such as mechanical strength, aesthetic requirements and the type of polymerization, rather than on the biocompatibility, a valid characteristic in all types of posts on the market.
  • the commercial posts currently available on the market whether metallic or polymeric, are however provided with various standardized shapes obtained in large series and are constituted by materials provided with characteristics that are slightly different each time. They can have cylindrical, frustoconical, oval or sub-oval shape, though substantially their shape is simple and linear, lacking bends, projections and recesses. Their external surface can be smooth, slightly notched or rough, but in any case they are produced in series with standardized size and profiles.
  • the adaptation is therefore carried out by operating on the tooth with calibrated cutters, however to the detriment of the dental substance, with consequent further weakening of the tooth itself. Nevertheless, there often remains an excessive tolerance between the post and the tooth to be treated. This undesired space is currently filled with cement. However, the cement is in turn a further weak point of the system, since the greater the quantity of cement interposed between the tooth and the post, the greater its contraction will be during hardening. The contraction of the cement is indeed tied in a directly proportional manner to its mass and hence the more cement is used, the greater the probability of separation of the post itself once the cement has been consolidated.
  • the posts on the market in order to be sufficiently retentive for the subsequent restoration, must be further modified by the dentist with composite material, which must achieve the so-called actual retentive support "core". This step may cause the insertion of further errors or weak points, such as the contraction of the core or partial or total separation of the composite with consequent loss of the restoration.
  • the non- standardized posts or the personalized posts currently available on the market are specially created for each single patient.
  • the dentist takes the mold of the canal with plastic polymers according to the conventional technique, normally resin, pastes with silicone, polyether or hydrocolloid base. From the impression obtained, a small model is developed that accurately replicates the form of the tooth itself and a post is then made on this model that is adapted with extreme precision to the radicular cavity.
  • This technique allows obtaining the maximum precision and the minimum tolerance between the post and the canal, allowing a considerable reduction of the accumulation of cement and the disadvantages connected thereto.
  • the personalized posts can only be made with metals, ceramics and zirconium. As stated above, such materials are provided with a high Young's modulus and are hence considerably harder than the dentin. The excessive hardness of these materials, under the masticator loads, could even lead to the fracture of the tooth, with consequent extraction of the element.
  • the innovation introduced by the present industrial invention patent application consists of combining the merits of the aforesaid techniques using personalized posts, hence specially made and customized for each patient, deriving however from a preformed block made with materials having a modulus of elasticity that approaches that of the dentin in a manner so as to prevent the fracture of the tooth yet conferring a good strength in order to avoid the fracture of the post.
  • These blocks could be constructed in carbon fiber or better yet made of glass fiber, associating the merits of these materials with those deriving from the personalized posts.
  • the shape of the post, object of the present invention will be adapted with extreme precision to the infinite anatomic variables of each single tooth, in a manner so as to best dissipate the occlusal forces, drastically reducing the thickness of cement to be placed in the post-tooth interface.
  • the personalized post thus achieved is a single piece termed "post and core”.
  • the present invention intends to remedy the aforesaid drawbacks of the prior art by describing an innovative endodontic post adapted to overcome all the current problems and provided with an ideal Young's modulus, with a form compatible with that of the tooth to be treated and which can be quickly and inexpensively obtained.
  • the present inventive concept intends to describe an innovative method and the product thus obtained for the machining of the polymer blocks, from which a personalized endodontic post is obtained; the concept is inspired by the already known machining technique which serves to obtain manufactured prosthetic items starting from a polymer block of raw material, usually with cylindrical or cubic form.
  • said block or cube of raw material to be machined is usually stably fixed, by means of mono-component or bicomponent adhesive, to a metallic structure adapted to be mounted on a common cutter, which obtains from said block the form of the crown or filling most adapted to the patient.
  • blocks or cubes made of zirconium or silicate ceramic, composite blocks or in only resin have been used.
  • such prior art adapted for the large-series production of standardized endodontic posts is instead adapted for obtaining personalized posts made of glass fiber with matrix obtained for example with the known resinous bis-GMA matrix.
  • This material i.e. the matrix mixed with the glass fiber, has an optimal modulus of elasticity for attaining endodontic posts, since it is similar to that of the dentin associated with a suitable fracture strength, therefore it does not damage the teeth.
  • the product thus obtained allows postponing the reconstruction of the core, saving time and increasing the quality of the manufactured product.
  • a common block made of glass fiber and matrix for example, starting from a block with parallelepiped shape
  • a suitably personalized endodontic post with particular physical characteristics: size, shape, modulus of elasticity or other, adapted to be perfectly inserted in the cavity present in the tooth of the patient to be treated.
  • said raw material block - fixed with adhesive for example on its metallic support - is transferred into a common cutter of known type.
  • the cutter operates based on the digitalized information that is supplied thereto, on the basis of a digitalized impression of the dental cavity detected by an optical scanning device placed in the mouth of the patient, where the post will be subsequently inserted.
  • an optical scanning device placed in the mouth of the patient, where the post will be subsequently inserted.
  • the dental cavity was first meticulously cleaned, then carefully explored and precisely surveyed with conventional impression materials such as resin, silicones, polyethers and hydrocolloids, or with a common optical scanning device.
  • Such optical scanning device all the useful information having been obtained for making said endodontic post of personalized type - will transmit such information via data processing to the cutter device which starting from the block of raw material, will achieve the endodontic post provided with the characteristic size detected in the patient's cavity, in a manner so as to be adapted to be perfectly inserted inside said cavity.
  • the present invention allows attaining a personalized endodontic post that is perfectly adapted to the particular anatomic shape of each single patient who must receive it and in the long term does not give rise to problems of biocompatibility and mechanical problems by virtue of the fact that it is made of a material - i.e. glass fiber in bis-GMA matrix or in another resin matrix - such to have a modulus of elasticity close to that of the dentin.
  • the percentage by weight of the glass fiber with respect to the matrix can widely vary, on the condition that the modulus of elasticity of the finished endodontic post does not undergo unacceptable variations or at least variations overly distant from those of the tooth, or it is not excessively weakened, so as to render it overly fragile and fracturable.
  • the material block from which the endodontic post is obtained was made of composite, stratified ceramic or simply in ceramic, according to the present invention such block is made of glass fiber mixed with resin matrix (bis-GMA matrix).
  • the ceramic currently used in the prior art is often too hard, creating structural problems at the root of the tooth itself, above all during mastication.
  • the present invention offers the possibility to quickly and directly form, on a common raw block, a personalized endodontic post entirely made of glass fiber and matrix.
  • the glass fiber in the bis-GMA matrix does not give rise to drawbacks due to its optimal modulus of elasticity, as stated above, and moreover the implant operation for the endodontic post is less invasive by virtue of its perfectly personalized ("customized") form, obtained by the exploration or rather preliminary optical scanning of the introduction cavity.
  • the entire operation of survey of the cavity of the tooth of the patient, the transmission of the detected data to the cutter device, the positioning of the glass fiber and matrix block provided with the metallic portion with stem glued on a face thereof in a manner so as to be manageable by the cutting machine, the operation of cutting the block, its separation from the metallic stem portion, so as to obtain the personalized endodontic post, can be carried out in a short time period and directly within any one dentist office, making the aforesaid technique extremely well-focused, quick and inexpensive.
  • - Fig. 1 shows a block 3 made of raw material whose oblong form is suited for the obtainment of a post, i.e. a block 3 made of solid glass fiber according to the present invention not yet machined, whose base 9 is fixed - for example by means of gluing - to a metallic portion 2 with stem, for the mounting of the raw block 3 on the cutter so as to be able to execute the desired machining.
  • - Fig. 2 shows a possible personalized form of the endodontic post 1 ready to be inserted in the root of a tooth obtained from the raw block 3 of Fig. 1 after the machining in the cutter. The recess 5 is observed along with the irregular shape of the tip 10.
  • Fig. 3 shows a different form of endodontic postl, with respect to Fig. 2, in which the section rather than being circular as in Fig. 2, is substantially oval or elliptical at least at the base 7.
  • the endodontic postl has a lateral recess 5.
  • Fig. 4 shows a further form of said endodontic post 1, with respect to the previous figures, such endodontic post 1 having rather irregular form and section, with a lateral projection 6, a pair of irregular recesses 5 with form slightly different from Fig. 3.
  • the endodontic post 1 has a substantially irregular progression, and the base 7 of said endodontic post 1 also has irregular form.
  • the base of the block 3 is that connected to the metallic part 2 for fixing to the cutter (not shown in the figure).
  • the endodontic post 1 can be perfectly custom-made and is precisely adapted to the relative introduction cavity (not shown) of each single patient.
  • the present invention is also easily extended to the obtainment of other dental prostheses, such as crowns or fillings made of glass fiber mixed with resin matrix and/or combinations thereof.

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

Procédé d'obtention de tiges endodontiques conçues pour être insérée dans une cavité canal à l'intérieur de la racine d'une dent d'un patient. La tige endodontique est directement fabriquée à partir d'un bloc de verre ou de matrice en résine renforcée de fibres de carbone. Le balayage optique de la cavité de la dent traitée par procédé endodontique dans la bouche du patient dans laquelle sera insérée la tige endodontique est effectué au moyen d'un dispositif de balayage optique courant. Le bloc a la taille la plus appropriée pour la tige endodontique. Le bloc est collé à un dispositif de retenue métallique commun conçu pour pouvier être taillé avec un dispositif de coupe. Le bloc est taillé par le dispositif de coupe sur la base des informations numérisées de la cavité dentaire obtenues préalablement et numériquement transférées vers le dispositif de coupe. La tige endodontique ayant la forme personnalisée souhaitée spécifique à l'opération devant être exécutée est extraite de l'élément de coupe.
PCT/IB2014/058469 2013-01-28 2014-01-22 Procédé de fabrication de tiges endodontique WO2014115090A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000047A ITRM20130047A1 (it) 2013-01-28 2013-01-28 Metodo per la realizzazione di perni personalizzati in fibra di vetro o di carbonio.
ITRM2013A000047 2013-01-28

Publications (1)

Publication Number Publication Date
WO2014115090A1 true WO2014115090A1 (fr) 2014-07-31

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PCT/IB2014/058469 WO2014115090A1 (fr) 2013-01-28 2014-01-22 Procédé de fabrication de tiges endodontique

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IT (1) ITRM20130047A1 (fr)
WO (1) WO2014115090A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160045282A1 (en) * 2014-08-15 2016-02-18 Martin David LEVIN Customized Root Canal Obturation Cores and Methods of Making Customized Root Canal Obturation Cores
EP3501444A1 (fr) * 2017-12-22 2019-06-26 Markus Lietzau Composition de remplissage du canal radiculaire
WO2019122009A1 (fr) * 2017-12-22 2019-06-27 Markus Lietzau Composition de remplissage de canal radiculaire
US10426573B2 (en) 2014-08-15 2019-10-01 Martin David LEVIN Customized root canal obturation cores and methods of making customized root canal obturation cores
FR3088537A1 (fr) * 2018-11-16 2020-05-22 Lyra France Fabrication d'un inlay-core par usinage en cabinet
US12127902B2 (en) 2017-09-08 2024-10-29 Martin David LEVIN Scaffolds, systems, methods, and computer program products for regenerating a pulp

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480209A1 (fr) * 1990-10-10 1992-04-15 Mikrona Technologie Ag Ebauche destinée à la fabrication d'une pièce dentaire et dispositif de préhension y associé
CN101803958A (zh) * 2010-03-12 2010-08-18 北京欧亚瑞康新材料科技有限公司 齿科修复用一体化纤维桩及其制备方法
CN102426614A (zh) * 2011-08-08 2012-04-25 北京大学口腔医学院 齿科个性化一体化非金属桩核的计算机辅助设计制作方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480209A1 (fr) * 1990-10-10 1992-04-15 Mikrona Technologie Ag Ebauche destinée à la fabrication d'une pièce dentaire et dispositif de préhension y associé
CN101803958A (zh) * 2010-03-12 2010-08-18 北京欧亚瑞康新材料科技有限公司 齿科修复用一体化纤维桩及其制备方法
CN102426614A (zh) * 2011-08-08 2012-04-25 北京大学口腔医学院 齿科个性化一体化非金属桩核的计算机辅助设计制作方法

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160045282A1 (en) * 2014-08-15 2016-02-18 Martin David LEVIN Customized Root Canal Obturation Cores and Methods of Making Customized Root Canal Obturation Cores
WO2016025587A1 (fr) * 2014-08-15 2016-02-18 Levin Martin David Noyaux d'obturation de canal radiculaire personnalisés, et procédés de fabrication de noyaux d'obturation de canal radiculaire personnalisés
KR20170043111A (ko) * 2014-08-15 2017-04-20 마틴 데이비드 레빈 맞춤형 치근관 밀폐 코어 및 맞춤형 치근관 밀폐 코어를 제조하는 방법
US9668824B2 (en) 2014-08-15 2017-06-06 Martin David LEVIN Customized root canal obturation cores and methods of making customized root canal obturation cores
US10426573B2 (en) 2014-08-15 2019-10-01 Martin David LEVIN Customized root canal obturation cores and methods of making customized root canal obturation cores
KR102411568B1 (ko) * 2014-08-15 2022-06-21 마틴 데이비드 레빈 맞춤형 치근관 밀폐 코어 및 맞춤형 치근관 밀폐 코어를 제조하는 방법
US12127902B2 (en) 2017-09-08 2024-10-29 Martin David LEVIN Scaffolds, systems, methods, and computer program products for regenerating a pulp
EP3501444A1 (fr) * 2017-12-22 2019-06-26 Markus Lietzau Composition de remplissage du canal radiculaire
WO2019122009A1 (fr) * 2017-12-22 2019-06-27 Markus Lietzau Composition de remplissage de canal radiculaire
US11964031B2 (en) 2017-12-22 2024-04-23 Markus Lietzau Root canal filling composition
FR3088537A1 (fr) * 2018-11-16 2020-05-22 Lyra France Fabrication d'un inlay-core par usinage en cabinet

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