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
  • 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
  • A61C1/12—Angle hand-pieces
• • 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
  • A61C1/14—Tool-holders, i.e. operating tool holders, e.g. burr holders
• • 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
  • A61C1/185—Drives or transmissions
  • A61C1/186—Drives or transmissions with torque adjusting or limiting means

Definitions

• the present invention generally relates to devices for dental implants, and more particularly to devices with pre-calibrated torque and with an abutment holder for driving prosthetics on implants and methods of use.
• the term "handpiece” is a generic and euphemistic term for generic dental tools. A dental handpiece is typically held and operated by a dentist with a sole hand.
• the terms "driver”, “handpiece”, “dental handpiece”, “contra angle handpiece” and “latch head” are used herein interchangeably. The driver as used herein also uses a contra angle head to accept latch burs.
• the term "prosthetic screw” as used herein refers to screws used to attach various abutments, healing caps and copings to implants or their analogues, and “prosthetics” is the procedure of using those parts.
• driver tip refers to interface of latch bur that are held and operated by a dental latch head handpiece and are suitable and fit to various prosthetic screw heads.
• a driver tip is also known as "chuck”.
• Figure 1 depicts an example of a pre-calibrated torque wrench of prior art
• Figure 2 depicts an example of an abutment holder of prior art, which are too weak to prevent rotation torque from an implant when applied by any kind of driver.
• a separate tool - an abutment holder such as abutment holder 80, is also used to hold and position abutments, especially for posterior implants where there are limited access and poor visibility.
• Figure 3 illustrates a side view of an abutment 50, having a hexagonal base 54, designed for internal hex implant.
• Figure 4 depicts a latch driver tip 40 to fit screw head 53 (usually hex), an abutment 50 and abutment screw 52
• Figure 5 illustrates the pre-calibrated torque wrench 20 shown in Figure 1, operatively used to tighten abutment 50 to implant hex 60
• Figure 5 illustrates implant 60 (internal hex) with hexagonal cavity 62, into which the hexagonal base 54 of abutment 50 is inserted.
• This tool's grasping force is very limited like other existed today is used just to help to correctly position the abutment on the implant hex, with no connection to the action of screwing in the abutment screw ,There is therefore a need, and it would be highly advantageous to use easier and time consuming techniques for holding an abutment while driving its screw on implant.
• the principal intention of the present invention includes providing a cordless preset torque driver, with a detachable abutment holder for driving prosthetics quickly onto and from implants in the limited space of a human being mouth.
• An aspect of the present invention is to provide a cordless prosthetic parts driver with a detachable abutment holder to ease access and allow a single hand technique.
• the abutment holder provided by the present invention functions simultaneously with the driver.
• the simultaneous use of the driver band the abutment holder enables a single hand practice with abutments and improves the access to the inner teeth implants. .
• a cordless, contra angle, pre- calibrated torque prosthetic parts driver for dental implants includes: (a) an electric motor with gear mechanism; and (b) A latch head capable of holding a latch bur with various tips operatively adaptive to various prosthetic screw heads to various driver lengths matching various heights of abutments; and (c) a pre-calibrated torque mechanism having a preset torque value.
• the electric motor with gear mechanism is capable of turning the latch head in forward and backward directions.
• the present invention further includes an abutment holder, preferably detachable, that enables driving abutments with a single hand technique without transferring torque to the implants.
• the abutment holder includes a mechanism for grasping an abutment and a mechanism for attaching the holder to the driver latch head. The grasping mechanism firmly holds an abutment and prevents the abutment from rotating, and thereby prevents the transfer of torque forces from the abutment to a coupled implant, when the abutment is being driven into the implant or out of the implant.
• the present invention further provides, as part of the single hand method, an organizing device that includes orderly tapped holes with various screw threads, to hold healing caps and/or healing abutments.
• the pre-calibrated torque mechanism includes two discs, two latches in grooves and a retaining spring ring.
• the spring ring holds the discs together and sets, together with the shape of the grooves, a single pre-calibrated torque value, thereby preventing a prosthetic screw from being tightened with a force surpassing the pre-calibrated torque value, and wherein when the tightening force reaches the preset torque value, the latches overcome the force applied by the retaining spring ring thereby disengaging the two discs, and thereby causing a temporary separation of the latch head shaft from the driver motor shaft.
• the driver of the present invention replaces three prior art devices: a hand/manual driver; an abutment holder, which requires a second hand; and a manual pre-calibrated torque wrench.
• driver tip here is already within the screw of a grasped abutment, so only 20mm of vertical space is needed for mounting the abutment onto a vacant implant, while even when using the shortest hand driver, the fingers used and the abutment height require more than 30mm of space above the fixture.
• one aspect of the present invention is to provide a cordless, contra angle driver for driving prosthetic parts, especially on posterior implants with a pre-calibrated torque.
• the pre-calibration is done by a special embodied mechanism.
• FIG. 30 Another aspect of the present invention is to provide a cordless prosthetic parts driver with abutment holder to ease access and allow safer sole hand techniques.
• An aspect of the present invention is to provide a tool that will "hold and release" healing caps in a certain order, during prosthetic procedures, thus allow for a single hand method.
• the pre-calibrated torque driver may also be used with a straight nose cone (better access to areas like anterior maxilla).
• the drivers of the present invention typically use an electric motor, typically powered by batteries, placed in a battery compartment and hence the driver is referred to as a cordless driver.
• the present invention is not limited to a batteries powered motor and the driver of the present invention can be also powered by an external electric power or by compressed air, as exists in dental units.
• FIG. 1 depicts an example of a pre-calibrated torque wrench of prior art
• FIG. 2 depicts an example of an abutment holder of prior art
• FIG. 3 illustrates a side view of an abutment designed for internal hex implant, including an enlargement of the undercut area
• FIG. 4 depicts a latched driver tip, with an abutment and the abutment screw
• FIG. 5 illustrates the pre-calibrated torque wrench shown in FIG. 1, operatively used to tighten an abutment to the implant hex with a designated screw, optionally using a hex driver;
• FIG. 6 illustrates a cordless pre-calibrated torque driver with mini latch head, according to an embodiment of the present invention
• FIG. 7 illustrates a cordless pre-calibrated torque driver with a straight nose cone, according to an embodiment of the present invention
• FIG. 8a is a side perspective view illustration of an abutment holder, according to the preferred embodiment of the present invention.
• FIG. 8b is a top perspective view illustration of the abutment holder, shown in FIG. 8a;
• FIG. 8c is a bottom view illustration of the abutment holder, shown in FIG. 8a;
• FIG. 9 illustrates the cordless pre-calibrated torque driver shown in FIG. 6, with the abutment holder, shown in FIG. 8a, attached to the driver;
• FIG. 10 illustrates the cordless pre-calibrated torque driver shown in FIG. 6, with a healing cap
• FIG. 11 depicts the cordless pre-calibrated torque driver shown in FIG. 6, assembled with an abutment and the abutment holder, shown in FIG. 8a.
• FIG. 12 depicts an organizer for attaching healing caps and hold other accessories, according to embodiments of the present invention.
• FIG. 13 is a schematic block diagram illustrating the usage of the driver with the organizer, according to an embodiment of the present invention.
• FIG. 14 depicts a laboratory stone model of implanted jaw with two analogues and abutments
• FIG. 15 is a frontal view of the pre-calibrated torque mechanism, according to an embodiment of the present invention.
• FIG. 16 is a partial cross section lateral view of the pre-calibrated torque mechanism, according to an embodiment of the present invention.
• FIG. 17 illustrates the interface between the contra angle latch head and the pre-calibrated torque mechanism, according to an embodiment of the present invention.
• the principal intentions of the present invention include to provide a cordless device for driving prosthetic parts on implants with a pre-calibrated torque, and a one hand method of using it.
• the pre-calibration is done by a special embodied mechanism.
• Another object of the present invention is to provide a cordless driver with an abutment holder that improves access to posterior implants.
• the driver of the present invention is clearly more effective than prior art drivers, since the prior art abutment holders are simple grasping tools that occupies one of the dentist's hands (while holding a conventional driver in the other), while the abutment holder of the present invention is self-held, attached to the handpiece, allowing a single-hand-technique while leaving one of the dentist's hands free for other tasks.
• the abutment holder protects the implant from the torque used to tighten/release the abutment screw by producing an equal anti rotational moment to counteract and absorb that torque in the connected driver's head.
• the abutment holder is a miniature tool which almost completely eliminates the problem associated with prior art practice, of worksite obscuring.
• the organizing device includes orderly tapped holes with various screw threads to hold healing caps and a special compartment to load/unload the abutment holder by sole hand.
• the device is a supporting device for a dentist, especially when using a driver with a single hand, according to the present invention. The dentist can efficiently unload on the organizing device healing caps.
• the organizing device can be used also for healing/temporary abutments and any other dental item, various driver tips, etc.
• FIG. 6 illustrates cordless pre-calibrated torque driver 100 with mini latch head 130, according to embodiments of the present invention.
• Rear part 110 of the body of driver 100 may serve as a batteries compartment and the shape of rear part 110 can be adapted to the batteries type used.
• Middle part 120 of the body of driver 100 preferably contains a motor and a gear, including a pre-calibrated torque mechanism. This is the preferred arrangement but the present invention is not limited to the described arrangement.
• the torque mechanism or gear can be built inside head 130 of device 100.
• Driver 140 illustrated In Figure 7 illustrates an option of using a straight nose cone 142 instead of contra angle, which functions as anterior upper jaw screwdriver or as orthopedic screwdriver.
• abutment 50 preferably includes flattened anti-rotational area 55 and small undercut area 56, two useful components for enhancing the grabbing method.
• Figure 8a is a side perspective view illustration of abutment holder 500, according to the preferred embodiment of the present invention.
• Figure 8b is a top perspective view illustration and
• Figure 8c is a bottom view illustration of abutment holder 500, shown in Figure 8a.
• Abutment holder 500 as well as other abutment holders, operatively stops and/or prevents the rotation of abutment 50, when being attached or detached by cordless pre-calibrated torque driver 100.
• FIG. 1 1 illustrates cordless pre-calibrated torque driver 100, assembled with abutment 50 being held by abutment holder 500, shown in Figure 8a.
• Figure 10 illustrates cordless pre-calibrated torque driver 100, with a healing cap 70 (abutment holder not attached).
• the motor When operating driver 100, the motor operatively turns either healing cap 70 or abutment screw 52 in or out (as desired), as respectively shown in Figures 10 and 11.
• the shape and/or diameter of insert 550 respectively adapted to the shape of the selected abutment 50 and to the length of the tip of driver 40 being disposed into hex cavity 53 of abutment screw 52.
• each abutment holder 500 is specific to each abutment 50 design. While tightening a screw 52 in direction 41 with torque driver 100, abutment holder 500 stops and prevents rotation of abutment 50. The torque pressure on flattened area 55 is transferred to fastening arms 570 which absorb the transferred torque by the contact areas with the body of driver 100. It should be noted that more than one flattened area might be in the circumference of abutment 50. Similar transfer of torque force occur when opening a tightened screw 52 with driver 100 having abutment holder 500 attached to driver 100.
• This principle is very useful for handling dental implants, since the torque is prevented from being transferred to the implant, unlike all other tools or methods known today, that transfer the applied torque directly to the implant, through hex 62, and risk the implant connection with the surrounding bone.
• the torque transferred to implant may also cause an implant to fail, especially when dealing with early loading when just part of the osseo-integration has occurred.
• Figure 15 depicts a frontal view of pre-calibrated torque mechanism 400 including motor shaft 450 of driver 100, according to embodiments of the present invention.
• Figure 16 is a partial cross section AA' lateral view of pre- calibrated torque mechanism 400, shown in Figure 15.
• a separate second momentary press key 122 When unscrewing, a separate second momentary press key 122 is pressed ("out", for example) and the screw will receive the full motor force, due to asymmetrical shape of grooves 422 that do not allow torque limiting mechanism to operate when opening a screw.
• This usage of the torque force is the preferred method, but the present invention is not limited by it, and any other mechanism can be utilized, including various preset torque values in the mechanism.
• the tightening /releasing method of abutment 50 enables a one hand technique.
• An abutment is typically located with flattened side 55 preferably pointing towards the buccal side (lips side), to allow access and fitting to flat area 555 of insert 550 direction of holder 500.
• Figure 14 depicts a laboratory stone model 90 of implanted jaw with two analogues 60 and abutments 50. After releasing screw 52, abutment 50 is taken from model 90, positioned and tightened as is in the patients' mouth.
• Abutment holder 500 shown in Figure 8a is given as examples only and other embodiments of such holder and attachments to latch head 130 can be designed and used.
• Figure 9 depicts driver 100 assembled with abutment holder 500, ready for operation, according to embodiments of the present invention.
• Abutment holder 500 is stably attached to the latch head 130 by fastening arms 570.
• abutment holders 500 include a hole 560 respectively, which is used to mount abutment holders 500 onto a corresponding pin 160 on latch head 130 (see Figure 10), and thereby abutment 50 can be held at a proper distance from latch driver tip 40.
• abutment holder 500 The operational steps of using driver 100 will now be described coupled with abutment holder 500, but the present invention in not limited by to abutment holder 500, and any other abutment holder can be designed to perform the task of stopping and/or preventing the rotation of abutment 50 and thereby prevent the transfer of torque moment to implant 60.
• abutment holders such as abutment holder 500 are attachable/detachable to/from driver 100.
• abutment holders such as abutment holder 500 are affixed to driver 100.
• the present invention also provides for an apparatus that facilitates an efficient, flexible and user-friendly method to take out healing caps 70 with every check of bridge structure (porcelain on metal or zirconium) in patient's mouth.
• Figure 12 illustrates organizer 200, according to embodiments of the present invention.
• the dentist loads the healing caps 70 and unloads them into special organizer 200, developed for that purpose.
• An organizer of the present invention can take different shapes and layouts with any number of threaded holes 218.In organizer 200, for example, the layout of threaded holes 218 are designed to simulate the mouth structure and thus enables keeping healing caps 70 in implants location order.
• Organizer 200 also contains compartments 212 that can hold other items and a compartment 214 to fit and catch abutment holder 500 on "abutment like" structure (possibly exchangeable) and a compartment 215 to hold the driver when not in use.
• the restorative dentist needs to transfer abutments 50 from the laboratory model 90 to patient's 10 mouth and back several times, before the final restoration takes place.
• the dentist needs to take out healing caps 70. It should be noted that after taking out healing caps 70 from implants 60, the working time should be as short as possible, before gums partially cover the vacant implants 60. Organizer 200 helps to shorten that time.
• FIG. 13 a schematic block diagram illustrating the method of usage of driver 100 with organizer 200, according to an embodiment of the present invention, is shown.
• the restorative dentist takes (action 210) healing caps 70 out of the mouth of patient's 10, and puts them in a designated location in the organizer 200.
• Operating motor 450 for a second forward will position a healing cap 70 firmly in the threaded hole, so it stays there when pulling up the driver.
• the dentist now using device 100 attaches holder 500 from compartment 214, takes every abutment 50 from the laboratory model 90, and attaches (action 220) each abutment 50 onto a vacant implant 60. After checking and determining accuracy of abutments grinding and bridge fabrication, the process continues in a reverse order.
• the dentist removes abutments 50 from implants 60 and puts (action 230) them back onto laboratory model 90, using device 100 with the still attached holder 500. Then, dentist detaches holder 500 by pressing holder 500 down with the thumb and the finger on the lower edges, preferably back to compartment 214 in organizer 200. The last step is to put (action 240) healing caps 70 back from organizer 200 onto vacant implants 60. As explained, in steps 210 and 240, holder 500 is not in use and is preferably held in organizer 200 (It is useful also for autoclaving the holder).
• the present invention is not limited by it, and any other mechanism known in the art can be used, including a mechanism that gives two or three preset torque values.
• the mechanism includes two discs (410 and 420), two latches 430 (connected with pins to disc 410), and a retaining ring 440 that presses the free ends of latches 430 into sloped grooves 422 in disc 420.
• Spring ring 440 can be any type of spring, including spring ring, retaining ring, rubber o-ring and so on and so forth. It should be noted that it is possible to change spring ring/o-ring 440 by the user and thereby change the preset torque value.
• Figure 17 illustrates the interface to the pre-calibrated torque mechanism, according to an embodiment of the present invention.
• Bearing 426 which is part of an altered "doriot" latch head 130 has a pin 427 that is operatively inserted in gap 421in disc 420.
• the first disc 410 firmly attached to motor shaft 450 and turns with the motor shaft.
• Disc 410 owns two latches 430.
• the free ends of latches 430 are held by a retaining ring 440 in grooves 422 within torque disc 420, such that all rotate with the motor shaft as a single unit.
• driver 100 is used for endodontic applications and/or for implantology.

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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)
• Orthopedic Medicine & Surgery (AREA)
• Dental Prosthetics (AREA)
• Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

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• 2008
  • 2008-02-03 EP EP08702717A patent/EP2124803A2/de not_active Withdrawn
  • 2008-02-03 WO PCT/IL2008/000138 patent/WO2008093345A2/en active Application Filing

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