EP3503838A1 - Tournevis dentaire - Google Patents

Tournevis dentaire

Info

Publication number
EP3503838A1
EP3503838A1 EP17761915.2A EP17761915A EP3503838A1 EP 3503838 A1 EP3503838 A1 EP 3503838A1 EP 17761915 A EP17761915 A EP 17761915A EP 3503838 A1 EP3503838 A1 EP 3503838A1
Authority
EP
European Patent Office
Prior art keywords
screwdriver
dental
shaft
screw
smart
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.)
Pending
Application number
EP17761915.2A
Other languages
German (de)
English (en)
Inventor
Konstantinos VALAVANIS
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.)
Individual
Original Assignee
Individual
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
Priority claimed from US15/246,210 external-priority patent/US11779435B2/en
Application filed by Individual filed Critical Individual
Publication of EP3503838A1 publication Critical patent/EP3503838A1/fr
Pending 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
    • A61C8/0089—Implanting tools or instruments
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/8875—Screwdrivers, spanners or wrenches
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/18—Flexible shafts; Clutches or the like; Bearings or lubricating arrangements; Drives or transmissions
    • 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
    • A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
    • A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
    • A61C8/0068—Connecting devices for joining an upper structure with an implant member, e.g. spacers with an additional screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • B25B13/481—Spanners; Wrenches for special purposes for operating in areas having limited access
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0007—Connections or joints between tool parts
    • B25B23/0021—Prolongations interposed between handle and tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0007—Connections or joints between tool parts
    • B25B23/0028—Angular adjustment means between tool head and handle
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C2201/00—Material properties
    • A61C2201/002—Material properties using colour effect, e.g. for identification purposes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C2201/00—Material properties
    • A61C2201/007—Material properties using shape memory effect

Definitions

  • the present disclosure relates to bendable screwdrivers, and in particular, to bendable screwdrivers for use in dentistry for securing screw-retained restorations and like-sized components.
  • a dental implant also known as an endosseous implant or fixture
  • a dental prosthesis such as a crown, bridge, denture, facial prosthesis or to act as an orthodontic anchor.
  • the basis for modern dental implants is a biologic process called osseointegration where materials, such as titanium, form an intimate bond to bone.
  • a variable amount of healing time is required for osseointegration before the dental prosthetic (a single crown, bridge or denture) is attached to the implant.
  • the dental prosthetic can be immediately attached to the implant before osseointegration has occurred for aesthetic and/or functional reasons.
  • the final prosthetic can be either fixed, where a person cannot remove the denture or teeth from their mouth or removable, where they can remove the prosthetic. In each case an abutment is necessary which couples the dental prosthetic to the implant.
  • screw-retained restorations are usually performed using appropriately sized and fitted screwdrivers.
  • a screw-retained fixation is very often positioned at an angle in relation to the restoration's anterior plane.
  • FIG. 1 is a cross-sectional view 10 of a conventional cemented type restoration.
  • a dental implant 11 is first osseointegrated in the jaw portion 12 of a patient's mouth and then a traditional prosthetic abutment 15 is threadedly secured into the implant. Once the abutment is secured in position, the implant specialist cements the prosthetic over the abutment as shown.
  • FIGs. 2 A and 2B The alternate, screw retained approach 20 is best shown and illustrated in FIGs. 2 A and 2B.
  • the abutment is integral with the artificial crown, bridge or denture that's fitted into the patient.
  • the dental prosthetic (and integrated abutment) is positioned into the implant and secured using a screw.
  • the prosthetic is provided with cavity that extends axially from an opening on the enameled surface of the prosthetic into and across the integrated abutment terminating into the implant's co-axial threaded cavity.
  • the prosthetic cavity is sized to fit the screw and also the screwdriver shaft which must be able to reach and secure the screw to the implant.
  • FIG. 2A the restoration is shown just before the screw is inserted and secured.
  • FIG. 2B a screwdriver is shown extending into the prosthetic cavity with intent to reach the screw (not shown) used to threadedly secure the prosthetic from the implant. In a similar manner, the prosthetic can be removed by unscrewing the screw.
  • the screwdriver typically used with screw-retainer restorations are screwdrivers with non-bendable shafts. The tips of commercially available screwdrivers are sized to accommodate design specifications of one or more specific implant vendors.
  • Screwdrivers and screwdrivers tips come in varying sizes and shapes depending on the specifications and screw types called for by the restoration's manufacturer. Very often, different manufacturers intentionally size restorations to force practitioners to purchase a specific set of tools (including screwdrivers) which works in favor of the restoration manufacturers since practitioners are less likely to switch to a different manufacturer if doing so may require buying a new set of tools. With that said, over time, tools have been introduced with interchangeable heads and tips to address this problem.
  • FIGs. 3A-3C are different perspective views of a prior art Straumann screwdriver 55.
  • the Straumann screwdriver 55 is capable of bending along the shaft region by virtue of a multitude of cylindrically shaped hollow shaft segments 60 that combine to form a flexible shaft 65.
  • the flexible shaft segments interlock to provide limited movement in any direction along the shaft, substantially as shown in accompanying FIG. 3A.
  • FIG. 3B and 3C are blown up, top level diagrammatic view and cross-sectional views, respectively, showing a single shaft segment 60. Due to the interlocking nature of segments 60 along shaft 65, a torque applied to shaft 65 from a handle portion 70 is transferred to a connected or integral drive tip 75.
  • the dimensions of screwdriver 55, including size and number of shaft segments, depend on the amount of torque and desired range of curvature desired. In practice, however, the segmented nature of the Straumann design makes it impractical for all but the easiest-to-access restorations.
  • the shaft is difficult to clean and costly to manufacture; difficult to apply even torque pressure along the vertical axis of the screw in many instances; and other inefficiencies.
  • FIGs. 4A-4J illustrate the prior art Omnigrip approach.
  • FIG. 4 A this is a partial perspective view of a patient's mouth.
  • One tooth is very clearly a screw-retained type restoration 405, given the presence of a bore cavity 406 which is shown in ghost view.
  • FIG. 4B A cross-sectional view of restoration 405 is shown in FIG. 4B.
  • a dental prosthetic 410 fixed by as screw (not shown) threaded along a planar axis to a dental implant 420.
  • An appropriate set of abutments connecting dental prosthetic 410 to dental implant 420, similar to the restoration shown in FIGs. 2 A and 2B, while not shown may be presumed.
  • the purpose of bore cavity 406 is to facilitate feeding a screwdriver into the open cavity to allow fixedly securing the appropriate screw.
  • dental prosthetic 410 is designed to be screwed at angle of 0 degrees off axis from the abutment face. Obviously, this has the negative result of providing ingress to cavity 406 from the front of the dental prosthetic. This means once the prosthetic is secured in place, the dental practitioner must fill the whole of the prosthetic (crown) to achieve a desired tooth-like aesthetic look and feel. This is not always easy or possible to achieve when a bore cavity is large.
  • An alternative approach to fix a dental prosthetic is to provide the bore cavity through which the screw will be secured at an angular level off axis. This way the opening of the bore cavity is not visible from the front. All the filling is done anteriorly.
  • FIG. 4C An example cross-sectional view of a restoration 425 with a dental prosthetic 432 having an associated bore cavity positioned at an offset of 25 degrees off the planar axis of dental implant 433 is shown in FIG. 4C.
  • a specially designed screw 435, screwdriver 440, and screwdriver tip interface 445 must be provided to facilitate angular torqueing (450) of screw 435 along the 25 degree axis off the anterior plane of dental implant 433 in the illustrated example.
  • a torque adjusting tool 460 may be coupled to the screwdriver handle. An example of this is shown in shown in FIGs. 4H and 41.
  • the present disclosure relates to a dental screwdriver having a shaft portion made of a smart type alloy that bends with little or no resistance along an arch forming portion thereof and without imparting torqueing forces along a distal front end portion thereof onto which is connected a drive tip designed to interface with an appropriately sized screw.
  • the smart alloy automatically assumes its original shape in the absence of bending forces on the shaft along the arch forming portion. In an alternate embodiment, assuming the original shape involves applying heat and/or subtle finger pressure.
  • the dental screwdriver is part of a set of screwdrivers, each having a distal front end portion which is uniquely weighted, sized and/or dimensioned to accommodate different driver tips, handle different torqueing functions, and/or configured to bend to a specific maximum angular arch without permanent deformation.
  • the screwdrivers may be uniquely identified (e.g., color coded) to identify the screwdriver's design specifications, such as elasticity type parameters.
  • the set of screwdrivers are designed to have integral tips to accommodate different manufacturer screw heads.
  • the shaft includes a second distal end, opposite the distal front end portion gripping end of the shaft, configured to couple to a handle portion, or to a torque measuring tool.
  • the handle portion itself may also be designed to work with a conventional torque measuring tool.
  • the smart alloy is sized and or made of smart alloy material along just that portion of the shaft intended to receive the optimum bending forces without imparting any bending action or force along the distal front end portion, which distal front end portion is made of either a non-smart alloy material, or of a smart alloy material of different type.
  • the drive tips are sized with diameters less than or equal to 0.4mm resulting in smaller vents (cavities) in the crown which results in increased overall strength of the restoration.
  • the smart alloy is Nickel titanium.
  • the dental screwdriver is characterized by very high elasticity. Exposing the screwdriver to heating and/or applying subtle finger pressure helps with recovery to an original shape prior to bending. ⁇ As such, the dental screwdriver achieves a very high kink-resistance in concert with the ability to bend through torturous paths without experiencing strain localization and/or plastic deformation.
  • the dental screwdriver has a very narrow design profile and sized to couple to an elastic abutment extractor or activator for Morse taper implant designs. This allows removing an abutment immediately after screw removal or, alternatively, to tighten an abutment without the use of a screw.
  • the dental screwdriver is sized to have a very long shaft for flexibility in hard to reach places.
  • the same shaft may alternatively include a telescopic portion disposed along a non-bendable, non-elastic portion of the shaft for even greater flexibility in use.
  • At least one of the shaft and the distal front end portion are magnetized to magnetically grip either a driver tip, the screw to be inserted, or both.
  • screws made of similar smart alloy material designed to conform to the specific shape of a vent or screw cavity when positioned for screwing to take advantage of the greater flexibility and reach the dental screwdriver proposed herein.
  • an electronic platform or stand-alone software tool is provided to facilitate in the training or appropriate selection of a screwdriver having an elasticity, size, and/or dimension matching a restoration's optimum design specifications.
  • a screw-retained type dental prosthetic having a curved bore cavity configured to facilitate the use of a bendable screwdriver.
  • the dental prosthetic includes an artificial tooth portion coupled to a prosthetic abutment.
  • the curved bore cavity extends from an opening in the artificial tooth portion to an opening in the prosthetic abutment.
  • the bendable screwdriver is a screwdriver of the type having a shaft made of a smart alloy with shape memory and superelasticity.
  • a method is also disclosed which involves identifying a screw type to be used to secure a dental prosthetic to a dental implant. At least one of a bendable screwdriver having a smart alloy shaft with integral drive tip end, a smart alloy shaft with integral drive tip end, and a drive tip end of the type configured to connect to a smart alloy shaft, are selected from a set of a plurality of same, respectively, on the basis of the screw type identified.
  • FIG. 1 is a cross-sectional view 10 of a dental implant 11 osseointegrated in jaw portion of a patient's mouth, and having a dental prosthetic shown fixed to dental implant using dental cement.
  • FIG. 2A and 2B illustrate in cross-sectional view, a conventional screw-retained restoration approach, before screwing and during screwing, respectively.
  • FIGs. 3A-3C are different perspective views of a prior art Straumann screwdriver.
  • FIGs. 4A-4J illustrate the prior art Omnigrip approach.
  • FIG. 5 is an example dental screwdriver in accordance with an exemplary embodiment with integral tip(s).
  • FIG. 6 is a graphical illustration of superelastic bending behavior of the proposed dental screwdriver manufactured from smart alloy material.
  • FIG. 7 shows an alternately shaped, smart alloy shaft in accordance with yet another exemplary embodiment.
  • FIG. 8 shows a cross-sectional view of a screw-retained type restoration configured to be secured via a bore cavity that is at least partially curved.
  • FIG. 9 shows a cross-sectional view which is a closer look of the screw retained type restoration in FIG. 8 with a bendable screwdriver shaft placed in the bore cavity during screw tightening action.
  • the present disclosure relates to a dental screwdriver having a shaft portion made of a smart type alloy that bends with little or no resistance along an arch forming portion thereof and without imparting torqueing forces along a distal front end portion thereof onto which is connected a drive tip designed to interface with an appropriately sized screw.
  • the smart alloy automatically conforms to its original shape upon removal of the twisting forces on the shaft along the arch forming portion which caused the arching in the first place.
  • the dental screwdriver is part of a set of screwdrivers, each having a distal front end portion which is uniquely weighted, sized and/or dimensioned to accommodate different driver tips, handle different torqueing functions, and/or configured to bend to a specific maximum angular arch without permanent deformation.
  • the screwdrivers may be uniquely identified (e.g., color coded) to identify the screwdriver's design specifications, such as elasticity type parameters.
  • the set of screwdrivers are designed to have integral tips to accommodate different manufacturer screw heads.
  • FIG. 5 An example dental screwdriver 505 in accordance with an exemplary embodiment with integral tip(s) is shown in FIG. 5.
  • the screwdriver 505 includes a handle portion 510 and a shaft 520, and designed to couple to any conventional torque measuring tool 515.
  • Items 520 are examples of different shaft ends which may be designed for shaft 520.
  • Screwdriver 505 may be marketed and sold as a stand-alone integral shaft made of a smart alloy material and provided with a specific driver tip (shaft end 530), or it may be marketed as a set of screwdrivers each screwdriver provided with a specific type of tip substantially as shown.
  • shaft end 530 shaft end 530
  • screwdriver 505 may be marketed and sold as a stand-alone integral shaft made of a smart alloy material and provided with a specific driver tip (shaft end 530), or it may be marketed as a set of screwdrivers each screwdriver provided with a specific type of tip substantially as shown.
  • One skilled in the art would appreciate that there are many, many different tips and the decision to market a set of screwdrivers with more or fewer tips is a commercial decision.
  • Shaft 520 in accordance with an exemplary embodiment, includes a latch end 535 designed to mate and fixedly secure the shaft to handle portion 510, or directly to a torque measuring tool depending one type of mechanism design one chooses to employ.
  • the key aspect is the shaft construction and design.
  • the shaft 520 may recover its shape after bending due to the use of smart alloy type material. Shape recovery may be automatic (e.g., no heating, electricity, or magnetism is applied). In another scenario, the recovery is assisted in that a minimum amount of finger pressure or some form of heat is involved for the smart alloy shaft to fully return to a non-bent position.
  • the smart alloy is Nickel titanium, also known as nitinol.
  • Nitinol is a metal alloy of nickel and titanium, where the two elements are present in roughly equal atomic percentages e.g. Nitinol 55, Nitinol 60.
  • Nitinol alloys exhibit two closely related and unique properties: shape memory and superelasticity.
  • Shape memory is the ability of nitinol to undergo deformation at one temperature, then recover its original, undeformed shape upon heating above its "transformation temperature”. Superelasticity occurs at a narrow temperature range just above its transformation temperature. In the scenario where the shaft exhibits "superelasticity", no heating may be necessary to cause the undeformed shape to recover.
  • the uniqueness of using a material like Nitinol is that it can, under certain uses, possess both shape memory and superelasticity. In uses where complete superelasticity is either not possible or not desirable, applying heat or some gentle finger pressure to assist with recovery into an unbent position may be necessary or desirable.
  • Applicants tap the special nature of Nitinol to construct a dental screwdriver which for the first time aims to allow dental practitioners to fit a screwdriver through closed bore cavity spaces, both curved and straight, through which the smart alloy shaft end will travel to reach a screw used to secure a dental prosthetic to a dental implant.
  • the smart alloy is sized and or made of smart alloy material along just that portion of the shaft intended to exhibit an optimum bending characteristic (elasticity) without imparting any bending action or force along the portion 520' of shaft 520 which extends from latch end 535.
  • portion 520' is made of either a non-smart alloy material, or of a smart alloy material of different elasticity, or of the same smart alloy but with different elasticity attributes along the shaft length to achieve desired bendability consistent with the intended action to be taken.
  • the drive tips are sized with diameters less than or equal to 0.4mm resulting in smaller vents (cavities) in the crown which results in increased overall strength of the restoration.
  • FIG. 6 A graphical illustration of superelastic bending behavior of the proposed dental screwdriver manufactured with smart alloy material (preferably nitinol) is illustrated in FIG. 6.
  • shaft 520 bent to different angles. Latch end 535 and shaft portion 520' do not bend at all.
  • the smart alloyed portion of shaft 520 is designed to flexibly bend to different angles and with different degree of curvature depending on the bending force applied, as shown.
  • positon A shaft 520 is shown in a natural state (non-bent) position.
  • position B we see shaft 520 bent at approximately 25 degrees off normal state (position A).
  • position C the bent angle is approximately 55 degrees.
  • parallel figure we see the same shaft 520, this time in a position D, with a bent angle near or at 90 degrees off normal.
  • shaft 520 begins to bend at different positions depending at the angle of incidence at which the torqueing force will be applied.
  • position D we see that a torqueing force is to be applied to a dental prosthetic 600 (shown in partial cross-sectional view).
  • Dental prosthetic 600 includes an artificial tooth portion 610 into which has been fitted a conventional type screw retained type prosthetic abutment 620.
  • Prosthetic abutment 620 includes a bore cavity 630 (preferably non-curved) configured to receive the screw (not shown) that's intended to secure dental prosthetic 600 to an abutting dental implant (not shown) for which it is designed, in the manner previously described above in connection with FIGs. 2A and 2B.
  • the artificial tooth portion 610 is unique in that it includes a "curved" bore cavity 640 which runs from the internal bore cavity 630 of abutment 620 to an eventual opening at the screw insertion end of dental prosthetic 600. While it is not necessary for bore cavity 640 to be curved, a curve may be desirable to allow the practitioner to screw dental prosthetic 600 to a dental implant for those teeth where additional bending elasticity is needed or desired to access during screwing and/or when, due to the nature of the tooth, it is easier to achieve a more aesthetic final result when filling in bore cavity 640 to complete the restoration.
  • the desired goal is to provide a shaft capable of bending in an arch like manner along a central portion thereof but capable of maintaining a substantially linear curvature near and along the drive tip end portion to allow coupling same to a screw to be fitted in an abutment.
  • the dental screwdriver is characterized by very high elasticity. Exposing the screwdriver to heating and/or applying subtle finger pressure helps with recovery to an original shape prior to bending. As such, the dental screwdriver is able to achieve a very high kink-resistance in concert with the ability to bend through torturous paths without experiencing strain localization and/or plastic deformation.
  • FIG. 7 shows alternately shaped, smart alloy shafts in accordance with yet another exemplary embodiment.
  • Shaft 710 is designed to function as an extractor tool in a Morse taper implant type configuration, while shaft 720 can be used as the activator tool to "activate" a Morse taper implant configuration.
  • Shaft 710 is characterized by a smart alloy distal end portion 710' which consists of a threaded portion 711 and a non-threaded portion 712.
  • Portion 710' is a conventional extractor tool end design with the only difference being that distal end portion 710' is configured so as to bend into position during extraction, in the same way as has been described above in connection with the bendable screwdriver configurations. While Morse taper designs comprise both screw- and non-screw type implementations, the extractor tool itself provides the unlocking force needed to disengage (unlock) a prosthetic Morse tapered abutment (not shown) from the associated dental prosthetic.
  • Shaft 720 helps with activating the locking of the abutment to the prosthetic in a Morse taper design and also includes a smart alloy distal end portion 720', which in turn consists of a threaded portion 721 and a non-threaded portion 722 (with threaded portion 721 located at the complete distal end of shaft 720).
  • Portion 720' is likewise a conventional activator tool end design with the only difference again being that distal end portion 720' is configured so as to bend into position during activation, in the same way as has been described above in connection with the bendable screwdriver configurations.
  • smart alloy activator and extractor type shafts 720, 710 operate to couple and decouple, respectively, a Morse taper abutment to a fitted design dental prosthetic, and in this regard behave as dental screwdrivers as contemplated and defined herein.
  • shafts 710, 720 are designed to simultaneously impart the necessary torqueing of the available screw at the time of activation of the locking mechanism. If there is no screw, then the purpose of dental screwdriver with a shaft 720 is to engage the locking mechanism in the Morse taper configured implant alone. Likewise, the purpose of a dental screwdriver with a shaft 710 is to disengage the locking mechanism.
  • FIG. 8 shows a cross-sectional view of a screw-retained type restoration 800 configured to be secured via a bore cavity 810 that is at least partially curved to allow a bendable screwdriver (not shown) with the proposed design to be inserted and the right amount of torque applied to the screw.
  • FIG. 9 shows a cross-sectional view which is a closer look of restoration 800 ⁇ with a bendable screwdriver shaft 820 in position during screw tightening action. While the screwdriver axis at the point of insertion of the screw may appear bent, it is preferred that the vent be sized so that at the point where torque is applied the only force exerted on the screw at the point of contact is a radial (or torqueing type) force.
  • the screwdriver shaft and/or accompanying drive tips may be configured to match multiple restoration type specifications for added flexibility.
  • Latch end 825 may be sized to have a universal head to accommodate different size or type handles, as well as torque-calibration and measuring type devices.
  • the dental screwdriver is sized to have a very long shaft for flexibility in hard to reach places.
  • the same shaft may alternatively include a telescopic portion disposed along a non-bendable, non-elastic portion of the shaft for even greater flexibility in use.
  • At least one of the shaft and the distal front end portion are magnetized to magnetically grip either a driver tip, the screw to be inserted, or both.
  • screws made of similar smart alloy material designed to conform to the specific shape of a vent or screw cavity when positioned for screwing to take advantage of the greater flexibility and reach the dental screwdriver proposed herein.
  • an electronic platform or stand-alone software tool may be provided to facilitate in the training or appropriate selection of a screwdriver having an elasticity, size, and/or dimension matching a restoration's optimum design specifications.
  • the platform is a smart-phone application providing appropriate visuals to help the practitioner select the appropriate tool, order replacement tips, learn about specific manufacturer torqueing specifications, and the like.
  • an electronic platform or stand-alone software tool such as a smart phone application, may be provided to aid the practitioner in choosing an appropriately sized dental prosthetic of the type having a curved bore cavity to achieve an optimum aesthetic result and/or to achieve an optimum use of a bendable smart alloyed screwdriver during torqueing.
  • the proposed screwdriver provides improved resistance to repetitive strain excursions due to the homogenous material used.
  • Shaft and shaft tip specifications must allow for even and consistent shape transformation of the shaft, especially along the shaft bending-capable section, without the shaft exhibiting undue strain or kinking, and without distorting and/or adversely impacting the intended maximum desired torqueing force to be applied to a screw at the shaft tip end.
  • the shaft should be bend and rotate where it is supposed to bend and rotate to match the curvature of the channel about which it is being rotated but without preventing an even maximum torqueing force (measurable by a coupled torqueing tool) to be applied to the tip end during tightening.
  • constituent materials from which the smart alloy is to be formed may need to be selected to meet desired optimum use parameters.
  • Smart alloys are comprised of crystal nanostructures that make non-destructive transformation possible. Further improvements may be realized by selecting tip ends and screw head dimensions that minimize natural wear and tear of the smart alloy, and/or change kink-resistance and stain deformation along the shaft. By altering the number of planes that the screwdriver tip engages (for example, providing a sixteen- faceted molecular structure), the smart alloy material from which the screwdriver is manufactured may exhibit stronger molecular compatibility resulting in increased resistance to breaking, wear or the like at the point of contact with screw, allowing at the same time hardening the head only. In another scenario, and for similar reasons, the screw is also made of smart alloy material.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Dentistry (AREA)
  • Mechanical Engineering (AREA)
  • Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Dental Prosthetics (AREA)

Abstract

L'invention concerne un tournevis dentaire présentant une partie de manche en un alliage de type intelligent qui se courbe avec peu ou pas de résistance le long d'une partie de formation d'arc correspondante et sans conférer de forces de torsion le long d'une partie d'extrémité avant distale correspondante sur laquelle est reliée une pointe d'entraînement conçue pour s'interfacer avec une vis de taille appropriée. L'alliage intelligent adopte automatiquement sa forme d'origine en l'absence de forces de torsion sur le manche le long de la partie de formation d'arc. Dans un autre mode de réalisation, l'adoption de la forme d'origine implique l'application de chaleur et/ou d'une délicate pression par le doigt. Le tournevis dentaire peut faire partie d'un ensemble de tournevis, chacun présentant une partie d'extrémité avant distale qui est lestée, calibrée et/ou dimensionnée de manière unique pour loger différents embouts, gérer différentes fonctions de torsion et/ou configurée pour se courber vers un arc angulaire maximal spécifique sans déformation permanente. L'invention concerne également une prothèse dentaire présentant une cavité d'alésage incurvée.
EP17761915.2A 2016-08-24 2017-07-26 Tournevis dentaire Pending EP3503838A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15/246,210 US11779435B2 (en) 2015-08-26 2016-08-24 Dental screwdriver
PCT/GR2017/000045 WO2018037250A1 (fr) 2015-08-26 2017-07-26 Tournevis dentaire

Publications (1)

Publication Number Publication Date
EP3503838A1 true EP3503838A1 (fr) 2019-07-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17761915.2A Pending EP3503838A1 (fr) 2016-08-24 2017-07-26 Tournevis dentaire

Country Status (1)

Country Link
EP (1) EP3503838A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070161427A1 (en) * 2006-01-10 2007-07-12 White Patrick M Flexible drive shaft
WO2008024062A2 (fr) * 2006-08-25 2008-02-28 Biomain Ab Superstructure dentaire et procédé de fabrication
EP2110097A1 (fr) * 2008-04-16 2009-10-21 Gebr. Brasseler GmbH & Co. KG Instrument dentaire destiné à une utilisation unique
DE102013014660A1 (de) * 2013-09-03 2015-03-05 Ivoclar Vivadent Ag Suprakonstruktion für ein Implantatsystem, Rohling zu deren Herstellung und dazugehöriger Schraubendreher
CN204308870U (zh) * 2014-11-12 2015-05-06 林群富 一种折弯式螺丝刀

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070161427A1 (en) * 2006-01-10 2007-07-12 White Patrick M Flexible drive shaft
WO2008024062A2 (fr) * 2006-08-25 2008-02-28 Biomain Ab Superstructure dentaire et procédé de fabrication
EP2110097A1 (fr) * 2008-04-16 2009-10-21 Gebr. Brasseler GmbH & Co. KG Instrument dentaire destiné à une utilisation unique
DE102013014660A1 (de) * 2013-09-03 2015-03-05 Ivoclar Vivadent Ag Suprakonstruktion für ein Implantatsystem, Rohling zu deren Herstellung und dazugehöriger Schraubendreher
CN204308870U (zh) * 2014-11-12 2015-05-06 林群富 一种折弯式螺丝刀

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2018037250A1 *

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