EP2552341A2 - Implant dentaire possédant des zones de structures superficielles différentes - Google Patents

Implant dentaire possédant des zones de structures superficielles différentes

Info

Publication number
EP2552341A2
EP2552341A2 EP11712180A EP11712180A EP2552341A2 EP 2552341 A2 EP2552341 A2 EP 2552341A2 EP 11712180 A EP11712180 A EP 11712180A EP 11712180 A EP11712180 A EP 11712180A EP 2552341 A2 EP2552341 A2 EP 2552341A2
Authority
EP
European Patent Office
Prior art keywords
region
dental implant
implant according
anchor
shaft
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP11712180A
Other languages
German (de)
English (en)
Inventor
Jost Lussi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Straumann Holding AG
Original Assignee
Straumann Holding AG
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 Straumann Holding AG filed Critical Straumann Holding AG
Priority to EP11712180A priority Critical patent/EP2552341A2/fr
Publication of EP2552341A2 publication Critical patent/EP2552341A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
    • A61C8/0012—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the material or composition, e.g. ceramics, surface layer, metal alloy

Definitions

  • the present invention relates to a dental implant according to claim 1, a dental implant system comprising the dental implant according to claim 12 or 13 and a method for producing the dental implant according to claim 1.
  • Titanium is biocompatible, has a sufficiently low modulus of elasticity and a relatively high strength and thus meets the most important requirements for a dental implant.
  • the osseointegrative properties of a dental implant are of great importance.
  • Primary stability is the mechanical retention of the implant. This mechanical retention is achieved via a thread, but can also be done by undercutting, clamping effect or by friction. While this primary stability decreases over time, the jawbone permanently grows on and bonds to the dental implant.
  • This composite called osseointegration, establishes a so-called secondary stability, which corresponds to a biological retention.
  • Osseointegration process should run as quickly as possible in order to reduce the risk of loosening and thus possibly an outbreak of the implant.
  • the currently used dental implants often have a roughened shaft area. Particularly good osseointegrative properties are present, for example, when the shaft area is mechanically roughened and subsequently additionally etched.
  • a corresponding dental implant made of a metal such as titanium is disclosed in EP-A-0388576. According to said document, the surface is subjected to sandblasting and subsequently etched with a reducing acid. Above the bone border these dental implants are usually smooth or polished.
  • a titanium dental implant usually has a dark, gray color and therefore differs from the natural color of the teeth. Based on this, ceramic dental implants have been proposed whose color can be adapted to the natural tooth color.
  • EP-A-1982670 describes a method of making a topography on a dental implant having a surface of ceramic material. In this case, after mechanical roughening, the surface of the dental implant is etched by means of an etching solution containing hydrofluoric acid. For mechanical roughening, for example during
  • Microstructural defects arise that can result in losses in the strength of the dental implant in the affected areas.
  • the object of the present invention is therefore to provide a dental implant, which on the one hand has good properties in terms of primary and secondary stability in the bone and on the other hand, high strength.
  • the dental implant of the present invention comprises a shaft region facing an apical end with a substantially cylindrical or tapered basic shape tapering in the direction of the apical end.
  • the shaft region is intended to be anchored in the implanted state in the bone of the patient.
  • the dental implant comprises a head region adjoining the shaft region and facing a coronal end opposite the apical end.
  • the shaft region now comprises an anchor region arranged in the region of the apical end and a transition region which adjoins the anchor region in the coronal direction and extends to the head region, the boundary between
  • Transition region is different from the surface structure of the anchor area.
  • the boundary between transition region and anchor region extends 3 to 5 mm apical to the boundary between head region and shaft region, more preferably 3 to 4 mm, and most preferably about 3.5 mm.
  • the shaft region in the axial direction has a length of 4 to 16 mm, preferably 6 to 16 mm.
  • the surface structure may be described by a surface roughness.
  • the invention makes use of the finding that the surface structure and in particular the surface roughness in the transition region can differ from that in the anchor region without severely impairing the primary and secondary stability.
  • the area of the dental implant on which the boundary between the bone surrounding the dental implant and the soft tissue (the so-called bone border) lies is of particular relevance in this regard. This can be explained by the fact that the implanted dental implant in case of
  • Bending load which is the decisive load situation for a dental implant, forms a clamped cantilever.
  • a force that acts at right angles to the longitudinal axis of the implant results in a moment that increases continuously until the clamping takes place.
  • the highest load thus occurs at the clamping, ie at a dental implant at the height corresponding to the boundary between bone and soft tissue.
  • the transition region is arranged such that in the implanted state, the boundary between the bone surrounding the dental implant and soft tissue comes to rest at the level of the transition region. Since the transition region thus encompasses that region of the dental implant which is subjected to the greatest load in the implanted state, the strength of the dental implant is decisively determined by the strength of the transition region.
  • Transition area ensures that even after a possible maximum regression of the bone of about 3 mm, the real bone boundary is still in the transition area. Thus, the risk of fracture of the dental implant is effectively reduced even in the largest possible bone loss.
  • the transition region has a uniform surface topography. Uncontrolled surface defects are therefore not present. This further contributes to greatly reducing the risk of fracture of the dental implant.
  • the anchor area is roughened more strongly as the transition area.
  • the surface of the anchor region usually has a macrostructure, in particular a macro-roughness, such as is available in particular by sandblasting. It has been shown that this macro-roughness promotes in particular the formation of a primary stability.
  • Said macro-roughness is superimposed with a microstructure, in particular a microroughness, such as is obtainable by etching, for example.
  • the transition region preferably has only a micro-roughness.
  • the transition region is designed in such a way or its height chosen such that in the implanted state the bone boundary, i. the boundary between the bone surrounding the dental implant and soft tissue, even after a possible maximum bone regression comes to lie in the transition region.
  • the dental implant As implantation, the dental implant is usually sunk so deep into the bone, that the bone boundary at the height of the border between shaft area and Head area or higher, the boundary between anchor area and transition area immediately after implantation is at least 3 mm apical to the bone boundary.
  • the risk of fracture of the dental implant is thus also reduced when the bone around the implanted dental implant regresses to a maximum, which is the case for a bone regression to a maximum of about 3 mm below the nominal or original bone boundary.
  • the specified heights of the transition region or of the shaft region ensure that the boundary between anchor region and transition region is in any case below the real bone boundary, that is to say even in the case of maximum bone loss.
  • the distance between the end of the anchor region facing the coronal end or the boundary between the anchor region and the transition region to the real bone boundary is in any case at least 0.5 mm.
  • the transition region extends to the coronal end of the shaft region. If, for example, microroughness obtainable by etching is present in the transition region, the formation of a secondary stability is promoted in this region even if the dental implant is sunk relatively deep in the bone of the patient.
  • a further preferred embodiment consists in that the dental implant according to the invention is made of ceramic, since in particular in the case of ceramics the described advantages of the invention come into play.
  • the anchor region has a surface roughness as obtainable by sandblasting.
  • the entire shaft region has a surface roughness obtainable by means of etching, preferably after the sandblasting of the anchor region.
  • the head region is generally configured to expand toward the coronal end. It is conceivable, for example, that the head area widens like a cup. Alternatively, however, it is also conceivable that the head region is designed substantially cylindrical.
  • the shank region of the dental implant has an external thread on its lateral surface. This intervenes in the implanted state in the bone of the patient and in particular contributes to achieving a good primary stability immediately after implantation. In addition, a larger surface is generated in the shaft area or in the anchor area and thereby also the osseointegration for the development of the
  • the present invention further includes a dental implant system comprising said dental implant formed integrally with a mounting member.
  • a dental implant system which includes the dental implant and a separately formed from the dental implant abutment.
  • the body part is generally rotatably mounted in a recess formed on the dental implant or on a correspondingly formed structure by means of holding means with respect to a longitudinal axis of the dental implant.
  • Another aspect of the invention relates to a method for producing a dental implant. This comprises the successive steps of a) merely sandblasting the anchor area, and b) etching the entire shaft area.
  • Fig. 1 is a diagram with a through the
  • Dental implant system of the present invention obtainable course of primary stability and secondary stability over time
  • Fig. 2 is a dental implant according to the present invention
  • Invention comprising two regions with differing surface structures or surface roughness shows.
  • Graph 1 of FIG. 1 describes the evolution of the primary stability of a dental implant 10 in bone over time from the time of implantation
  • graph 2 describes the development of the secondary stability of the dental implant 10 over time, also starting from the time of implantation.
  • the development of the overall stability, that is the sum of the primary stability and the secondary stability, is described by graph 3.
  • the formation of the primary stability and the secondary stability also proceeds very well by suitable surface roughness in the transition region and in the anchor region, if the surface roughnesses in these regions differ from one another without the strength of the dental implant being significantly impaired.
  • FIG. 2 shows a dental implant 10 with a shaft region 14 which essentially has a cylindrical or tapering basic shape in the direction of the apical end and a head region 12 which widens in the direction of the coronal end 16 as an alternative to the embodiment shown It is also possible to design the head area cylindrical and / or to keep it very short.
  • the surface of the head region 12 is intended to come into contact with the soft tissue of the patient in the implanted state and is generally smooth or polished. It is also conceivable to apply a special surface roughness in this area.
  • the shaft region 14 adjoins the head region 12 and extends from the latter to the apical end 18 of the dental implant 10.
  • the shaft region 14 has a surface texture in the form of a surface roughness and is subdivided into two regions, an anchor region 20 and facing the apical end 18 An anchor region 20 thus extends from the apical end 18 of the dental implant 10 to a limit 24.
  • the transition region 22 immediately adjoins the anchor region 20 at the boundary 24 and extends to to the coronal end of the shaft portion 14.
  • the border 24 is such that, in the implanted state, it comes to rest apically on a bone boundary 25 which occurs at maximum bone regression during healing and also during later application, as will be explained below.
  • the transition region 22 has a dimension, measured in the axial direction A of the dental implant 10, of 4 mm.
  • the entire dimension of the shank region 14, also measured in the axial direction A of the dental implant 10, is 12 mm, which results in the dimension, measured in the axial direction A, of the anchor region 20 of 8 mm.
  • This arrangement of the individual areas prevents the bone boundary 25 from coming to rest in the anchor area 20. Rather, the bone border comes in the selected dimensions even in the transition region 22, if according to ISO standard ISO 14801 with a maximum regression of 3 mm from the nominal bone boundary 29 is expected.
  • a recess 26 is formed, in which a mounting part can be used.
  • the mounting part By holding means 28, which are formed in the recess 26, the mounting part in a known manner rotatably relative to the longitudinal axis A of the dental implant 10 is mounted.
  • the body part may also be formed integrally with the dental implant 10.
  • the shaft region 14 is completely sunk in the bone of the patient.
  • the implant is thus surrounded by the bone up to a nominal bone boundary 29.
  • the real bone boundary ie the actual boundary between bone and soft tissue, may shift during healing due to bone regression. Due to the selected configuration of the individual regions, however, the real bone boundary comes to lie within the transition region 22 during the entire healing phase of the implant.
  • bone regression for existing implant systems is 1 to 2mm.
  • ISO standard ISO 14801 is - as mentioned - with a maximum regression of 3 mm from the nominal bone boundary 29 is expected.
  • the bone boundary 25 resulting at maximum expected bone regression is shown in FIG.
  • the boundary 24 extends between the anchor region 20 and transition region 20, ie, apically, the bone boundary 25 resulting at the maximum expected bone loss.
  • the distance between said bone boundary 25 and the boundary 24 is about 0.25 mm to 1 mm, particularly preferably about 0.5 mm.
  • the anchor region 20 and the transition region 22 each have a surface structure, wherein these differ from each other.
  • the anchor region 20 is usually roughened more than the transition region 22.
  • only the anchor region 20 is roughened in a first step by means of sandblasting.
  • the entire shank region 14, that is to say both the anchor region 20 and the transition region 22 is treated by means of etching.
  • the transition region 22 is thus treated only by etching, while the surface structure of the anchor region 20 is additionally treated by a preliminary sandblasting.
  • the surface structure of the transition region 22 corresponds to a microstructure obtained by etching, while the
  • the shaft region 14 in the transition region 22 is treated only by etching, it has a regular surface topography.
  • This regular surface topography ensures that a continuous strength of the dental implant 10 in the region of the transition region 22 is obtained. Microstructural defects, which can be caused by sandblasting, are thus largely absent in the transition region 22. Alternative surface structuring techniques that result in a regular surface topography are conceivable.
  • the transition region 22 is designed such that even with a sharp decrease in the effective bone boundary, any stress peaks occurring due to an external force will still fall into the transition region.
  • the dental implant can receive a moment occurring in the load case, without being damaged or even break off.
  • the dental implant moreover has an external thread 32 arranged on an outer lateral surface 30, which in the implanted state penetrates into the bone of the patient intervenes.
  • the largest part of the external thread is arranged within the anchor region 20.
  • a dental implant made of ceramic sandblasting is preferably carried out with aluminum oxide particles, in particular particles of modified aluminum oxide, such as corundum grains, with a mean particle size in the range of about 0.1-0.5 mm, preferably ca. 0.25 to 0.5 mm.
  • zirconium oxide particles or other materials can also be used as the blasting material.
  • the etching is carried out for said dental implants preferably by means of a hydrofluoric acid-containing solution, in particular at a temperature of at least 70 ° C.
  • Form shaft region 14 in order to take into account further requirements with regard to primary stability / secondary stability or strength of the dental implant.

Landscapes

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

Abstract

La présente invention concerne un implant dentaire qui comprend une zone de tige (14) orientée vers une extrémité apicale, présentant une forme de base sensiblement cylindrique ou diminuant sous une forme conique en direction de l'extrémité apicale. La zone de tige (14) est destinée à être ancrée à l'état implanté dans l'os du patient. L'implant dentaire présente en outre une zone de tête (12) orientée vers une extrémité coronaire opposée à l'extrémité apicale et raccordée à la zone de tige (14). La zone de tige (14) comprend une zone d'ancrage (20) disposée dans la zone de l'extrémité apicale et une zone de transition (22) adjacente à la zone d'ancrage (20) et s'étendant dans le sens coronaire jusqu'à la zone de tête (12), la limite entre la zone de transition (22) et la zone d'ancrage (20) se situant à une distance comprise entre 2 et 5 mm, dans le sens apical, de la limite entre la zone de tête (12) et la zone de tige (14) et la structure superficielle de la zone de transition (22) est différente de la structure superficielle de la zone d'ancrage (20).
EP11712180A 2010-03-31 2011-03-31 Implant dentaire possédant des zones de structures superficielles différentes Withdrawn EP2552341A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11712180A EP2552341A2 (fr) 2010-03-31 2011-03-31 Implant dentaire possédant des zones de structures superficielles différentes

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10003573 2010-03-31
EP11712180A EP2552341A2 (fr) 2010-03-31 2011-03-31 Implant dentaire possédant des zones de structures superficielles différentes
PCT/EP2011/001614 WO2011120694A2 (fr) 2010-03-31 2011-03-31 Implant dentaire possédant des zones de structure superficielle différentes

Publications (1)

Publication Number Publication Date
EP2552341A2 true EP2552341A2 (fr) 2013-02-06

Family

ID=42370928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11712180A Withdrawn EP2552341A2 (fr) 2010-03-31 2011-03-31 Implant dentaire possédant des zones de structures superficielles différentes

Country Status (3)

Country Link
US (1) US20130045464A1 (fr)
EP (1) EP2552341A2 (fr)
WO (1) WO2011120694A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD765856S1 (en) 2014-02-14 2016-09-06 Vita Zahnfabrik H. Rauter Gmbh & Co. Kg Dental implant

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0832619A1 (fr) * 1996-09-30 1998-04-01 Brainbase Corporation Implant avec des particules bioactifs et procédé de production

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE58905636D1 (de) 1989-03-23 1993-10-21 Straumann Inst Ag Metallisches Implantat.
US20060199152A1 (en) * 2001-06-04 2006-09-07 Hurson Steven M Natural implant system
ES2281995B1 (es) * 2004-11-08 2008-08-16 Vicente Gabriel Faus Badia Perfeccionamientos introducidos en implantes dentales.
EP2286758A1 (fr) * 2006-02-28 2011-02-23 Straumann Holding AG Implant d'une seule pièce
ATE551966T1 (de) * 2006-02-28 2012-04-15 Straumann Holding Ag Zweiteiliges implantat mit hydroxylierter kontaktoberfläche für weichgewebe
ATE441378T1 (de) 2007-04-19 2009-09-15 Straumann Holding Ag Verfahren zur bereitstellung einer topographie auf der oberfläche eines zahnimplantats

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0832619A1 (fr) * 1996-09-30 1998-04-01 Brainbase Corporation Implant avec des particules bioactifs et procédé de production

Also Published As

Publication number Publication date
WO2011120694A3 (fr) 2011-12-22
WO2011120694A2 (fr) 2011-10-06
US20130045464A1 (en) 2013-02-21

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