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WO2008155637A1 - Implant dentaire à profil fileté externe optimisé - Google Patents

Implant dentaire à profil fileté externe optimisé Download PDF

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Publication number
WO2008155637A1
WO2008155637A1 PCT/IB2008/001603 IB2008001603W WO2008155637A1 WO 2008155637 A1 WO2008155637 A1 WO 2008155637A1 IB 2008001603 W IB2008001603 W IB 2008001603W WO 2008155637 A1 WO2008155637 A1 WO 2008155637A1
Authority
WO
WIPO (PCT)
Prior art keywords
dental implant
thread
angle
profile
bone
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.)
Ceased
Application number
PCT/IB2008/001603
Other languages
English (en)
Inventor
Anitua Eduardo Aldecoa
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.)
BTI Biotechnology Insttitute
Original Assignee
BTI Biotechnology Insttitute
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 BTI Biotechnology Insttitute filed Critical BTI Biotechnology Insttitute
Publication of WO2008155637A1 publication Critical patent/WO2008155637A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • A61C8/0018—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 shape
    • A61C8/0022—Self-screwing
    • 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

Definitions

  • the invention relates to a dental implant for the insertion of dentures or false teeth in a patient's mouth.
  • dental implants are extremely small threaded parts which are inserted into a patient's mouth's bone, and to which a false tooth or denture is attached.
  • the implant and denture insertion process is usually the following: using the appropriate tools, a cavity is made in the patient's bone; then, the implant is introduced by threading it into the bone cavity; a period of weeks or months goes by until the implant is osteointegrated in the patient's bone; finally, one or several artificial teeth are attached to the implant by means of a screw or other accessories.
  • the dental implant consists essentially of two parts: a head, which provides the implant with the required connection means for connecting the screw, the false tooth and other pieces used temporarily in the insertion of the implant or permanently in the insertion of the false tooth; a point, or external threaded part, which enables the dental implant to be attached to the patient's bone.
  • connection of the dental implant to the patient's bone must be sufficiently robust to withstand the stress received by the dental implant during the useful life of the false tooth without the connection between the dental implant and the bone deteriorating. Stress may be lateral, although it is essentially longitudinal (in the direction of the implant's axis), originating when chewing with the false tooth.
  • the invention aims to offer a new external thread design for the dental implant that, among other advantages, improves the connection between the dental implant and the bone, allowing this connection to optimally withstand the stress arising from normal use of the false tooth during its useful life.
  • the new external thread design aims to minimize the stress transferred to the bone by the implant's external thread and therefore increase the implant's success rate (whereby "success" is understood to be the fact that the implant fully oseointegrates).
  • the object of the invention is a dental implant equipped with a threaded part whose thread profile essentially seeks to fulfil two requirements.
  • the implant according to the invention seeks mechanical properties and stress distribution in the bone that are similar to those of a natural tooth (considering the connection of the natural tooth to the bone as optimal, as a result of thousands of years of evolution). It must be taken into account that excessive stress transferred from the dental implant to the bone as a. result of the use of the dental implant during its useful life may cause damage and even the death of the bone tissue.
  • the threaded part must be self-tapping, in other words, it must allow the dental implant to create a threaded connection with the bone as it is being inserted.
  • the dental implant according to the invention presents a thread profile with a trapezoidal section (in other words, with a short side, a thread crest, a long side and a thread trough), with the peculiarity that substantially the entire part of the thread profile aimed in the direction of the longitudinal axis forms an acute angle with this longitudinal axis, whereby this angle is similar to the profile of a natural tooth.
  • the thread crest and the thread trough have a significantly reduced length with respect to the length of the long side, whilst the long side forms an acute angle with the longitudinal axis in the direction of the load force (following detailed observation of the profile of a natural tooth, it has been found that this profile presents an acute angle in the direction of the load force which ensures that the stress distribution in the bone is as low as possible).
  • the dental implant threaded profile succeeds in reproducing performance similar to that of the unthreaded profile of a natural tooth.
  • the angle between the short side and the longitudinal axis is at least twice that of the angle between the long side and the longitudinal axis, so as to ensure that the long side transfers the stress to the bone in the same way as a natural tooth and that the short side allows easy insertion of the dental implant in the bone.
  • a computer simulation of the mechanical behaviour of a dental implant according to the invention has been carried out, compared with a dental implant fitted with a conventional thread profile, i.e., a triangular thread profile (with a section in the shape of an equilateral triangle). More specifically, the stress transferred by the implant to the bone has been simulated, bearing in mind that the stress on the bone must be as low as possible as it is responsible for a phenomenon known as bone withdrawal. Also, excessive stress may produce ischemia, which is one of the most determining factors for implant failure. In this simulation it has been confirmed that the maximum stress peak occurs in the contact between the bone and the first spire of the threaded part (in other words, the spire closest to the head of the implant).
  • FIG. 1 shows a frontal view of a first embodiment of the dental implant according to the invention, inserted in a bone.
  • - Figure 2 shows an enlarged view of the thread profile of the dental implant of the previous figure.
  • - Figure 3 is a graph that represents the stress (in MPa) transferred by the implant to the bone in accordance with the angle (in degrees) between the long side and the longitudinal axis of the dental implant.
  • - Figure 4 is a graph that represents the stress (in MPa) transmitted by the implant to the bone in accordance with the thread step (in millimetres) of the threaded part of the dental implant.
  • FIG. 5 is a graph that represents the stress (in MPa) transferred by the implant to the bone in accordance with the thread depth (in millimetres) of the threaded part of the dental implant.
  • Figure 1 shows a frontal view of the dental implant according to the invention.
  • the dental implant (1) which is shown inserted in a patient's bone (3), is elongated in shape, along a longitudinal axis (8).
  • the dental implant (1) comprises a threaded part (2) which connects it to the patient's bone (3).
  • Figure 2 shows an enlarged view of the thread profile of the threaded part (2) of Figure 1.
  • the threaded part (2) has a trapezoidal section, formed of a short side (4), a thread crest (5), a long side (6) and a thread trough (7).
  • the long side (6) forms an acute angle (10) with the longitudinal axis (8), whereby this angle (10) is similar to that of the profile of a natural tooth.
  • This angle (10) is preferably between 5 and 40°, due to the fact that this range of angles has been observed in natural teeth that have been studied during the development of this invention. In a particularly advantageous form, this angle (10) will take a value of between 10 and 20°, for which the computer simulation has indicated that the distribution of stress between the dental implant (1) and the bone (3) is optimal.
  • Figure 3 shows a graph of the stress (in
  • the angle (9) is at least twice the angle (10), which allows that the threaded part (2) is self-tapping and, at the same time, that the amount of the threaded part (2) set out in a longitudinal direction at a different angle to that of the long side (6) is minimized.
  • the thread crest (5) and the thread trough (7) are of a significantly reduced length with respect to the length of the long side (6).
  • the angle (9) between the short side (4) and the longitudinal axis (8) is preferably between 70 and 40°. Angles (9) within this range are the optimal values in order to simplify the insertion of the dental implant (1) into the bone (3), requiring a lower insertion torque applied on the implant than with angles outside this range, as indicated in the computer simulation.
  • the computer simulation has also provided the result that the value of the angle (9) does not have an influence in the transfer of stress to the bone (3).
  • the thread step (11) visible in Figure 2 is between 5 and 2 times less than the diameter (12) of the dental implant (1). These values enable the dental implant according to the invention to be inserted using the conventional implant insertion method, which simplifies the insertion of the dental implant. Outside this range, the required number of times the implant must be turned or threaded (and therefore the torque applied) during the insertion of the implant into the bone would be so different that current procedures would not be valid. In a particularly advantageous manner, the thread step (11) is between 3.5 and 2.7 times less than the diameter (12) of the dental implant (1), as the greatest reduction of stress transferred is obtained in this sub-range.
  • the thread step (11) is preferably between 1.15 and 1.50 mm as between these values it is guaranteed that the stress transferred to the bone (3) by the dental implant (1) is minimal, as can be seen in Figure 4.
  • the thread depth (13) is between 20 and 12 times less than the diameter (12) of the dental implant (1). Like in the previous case, these values allow inserting the dental implant (1) using the same procedures according as with conventional dental implants. In a particularly advantageous manner, the thread depth (13) is between 18 and 15 times less than the diameter (12) of the dental implant (1), as this is the sub-range in which a greater reduction in the stress transferred is achieved. For example, for a dental implant (1) with a diameter (12) of 4 mm, the thread depth (13) is preferably between 0.20 and 0.27 mm as between these values it is guaranteed that the stress transferred by the dental implant (1) to the bone (3) is minimal, as can be seen in Figure 5.
  • the invention establishes an optimum thread profile with the following characteristics: a thread depth (13) of 0.3 mm (16.7 times less than the diameter), a thread step (11) of 1.5 mm (3.33 times less than the diameter), an angle (9) between the short side (4) and the longitudinal axis (8) of 55°, an angle (10) between the long side (6) and the longitudinal axis of 15°, a 0.05 mm long thread crest (5) and a 0.05 mm long thread trough (7) (both of which are significantly reduced with respect to the length of the long side (6), which is around 1.88 mm).
  • a dental implant (1) characterized by these values can be inserted according to conventional dental implant insertion methods, eases the threading of the implant in the bone, is easily manufactured and also transfers stress in such a way that the maximum stress peak is around 20% less than that of a conventional dental implant.

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Orthopedic Medicine & 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)
  • Dental Prosthetics (AREA)

Abstract

L'invention concerne un implant dentaire (1) muni d'une partie filetée (2) dont le profil fileté possède une section trapézoïdale, qui comprend un côté court (4), une crête filetée (5), un côté long (6) et un creux fileté (7), avec la particularité que la partie de profil fileté orientée en direction de l'axe longitudinal (8) forme un angle aigu (10) avec cet axe longitudinal (8), l'angle (10) étant similaire au profil d'une dent naturelle. Avec ces caractéristiques, la performance du profil fileté de l'implant dentaire (1) reproduit la performance du profil non fileté d'une dent naturelle. En d'autres termes, outre le fait que l'implant dentaire (1) obtenu est autotaraudé, il présente des propriétés mécaniques et une répartition de la contrainte osseuse similaire à celle d'une dent naturelle.
PCT/IB2008/001603 2007-06-18 2008-06-16 Implant dentaire à profil fileté externe optimisé Ceased WO2008155637A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ESP200701676 2007-06-18
ES200701676A ES2332841B1 (es) 2007-06-18 2007-06-18 Implante dental dotado de un perfil de rosca externa optimizado.

Publications (1)

Publication Number Publication Date
WO2008155637A1 true WO2008155637A1 (fr) 2008-12-24

Family

ID=39865439

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/001603 Ceased WO2008155637A1 (fr) 2007-06-18 2008-06-16 Implant dentaire à profil fileté externe optimisé

Country Status (4)

Country Link
AR (1) AR068320A1 (fr)
CL (1) CL2008002204A1 (fr)
ES (1) ES2332841B1 (fr)
WO (1) WO2008155637A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2223667A1 (fr) * 2009-02-26 2010-09-01 Nobel Biocare Services AG Implant dentaire, kit d'implant dentaire et procédé de connexion d'une superstructure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8903050U1 (de) * 1989-03-13 1989-05-11 ZL Microdent-Attachment GmbH, 5805 Breckerfeld Schraubenimplantat zur Befestigung eines Zahnersatzes
US5246369A (en) * 1988-09-02 1993-09-21 Francis Poulmaire Implantable system, rotary device and operating method
WO2007025784A2 (fr) * 2005-09-02 2007-03-08 Ziterion Gmbh Implants dentaires a chargement immediate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5246369A (en) * 1988-09-02 1993-09-21 Francis Poulmaire Implantable system, rotary device and operating method
DE8903050U1 (de) * 1989-03-13 1989-05-11 ZL Microdent-Attachment GmbH, 5805 Breckerfeld Schraubenimplantat zur Befestigung eines Zahnersatzes
WO2007025784A2 (fr) * 2005-09-02 2007-03-08 Ziterion Gmbh Implants dentaires a chargement immediate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2223667A1 (fr) * 2009-02-26 2010-09-01 Nobel Biocare Services AG Implant dentaire, kit d'implant dentaire et procédé de connexion d'une superstructure
WO2010097234A1 (fr) * 2009-02-26 2010-09-02 Nobel Biocare Services Ag Implant dentaire, kit pour implant dentaire et procédé de fixation d'un bridge dentaire à la mâchoire d'un patient
CN102307540A (zh) * 2009-02-26 2012-01-04 诺贝尔生物服务公司 牙齿种植体、牙齿种植体成套工具以及将牙齿桥固定至患者的颚骨的方法
CN102307540B (zh) * 2009-02-26 2014-07-30 诺贝尔生物服务公司 牙齿种植体、牙齿种植体成套工具以及将牙齿桥固定至患者的颚骨的方法

Also Published As

Publication number Publication date
ES2332841B1 (es) 2011-03-28
ES2332841A1 (es) 2010-02-12
AR068320A1 (es) 2009-11-11
CL2008002204A1 (es) 2008-12-19

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