Classifications

• • 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
  • A61C1/141—Tool-holders, i.e. operating tool holders, e.g. burr holders in an angled handpiece
• • 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
• • 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

Definitions

• the invention relates to a universal screwdriver contra-angle for screws of stubs of dental implants.
• This element is mainly used in the field of dental handpieces for screwing and unscrewing said screws.
• Prosthetic supports used in the dental field are often screwed.
• the screwdrivers In implantology the screwdrivers have a standard end similar to the tails of type 1 dental burs according to ISO 1797.1, the other end features the footprint of the screw, specific to each manufacturer.
• the standard portion of the screwdriver tip, hereinafter referred to as the tail end of the screwdriver cooperates with the mandrel of a screwdriver actuated manually by the practitioner.
• a first problem to be solved therefore consists in facilitating screwing unscrewing of the stub screws by improving accessibility on the screwdriver bit in a cramped space.
• a second problem to solve is related to the fact that the screw bits are particular for each manufacturer, which requires instrumentation specific to each implant manufacturer, particularly with regard to the head of the screw and therefore the screwdriver bit screwdriver.
• the screwdriver should, ideally, be adaptable with each type of material.
• the screwing of dental implant abutment screws to be perfectly controlled according to the characteristic characteristic of each manufacturer, a third problem is to have a tool comprising a safety as to the tightening torque applied to the screws. The different devices used in the field for this operation, apart from the torque wrenches, do not allow this control.
• the tools used in implantology must imperatively be sterilizable and preferably removable, for easy cleaning, so as to comply with hygiene rules. This constraint is also an additional problem.
• the invention therefore aims to solve these major difficulties by proposing a contra-angle adaptable with the screwdrivers of all manufacturers.
• the present invention relates to a mechanized device for screwing and unscrewing dental implant stump screws, adaptable at one end to a handle and at the other end to the tail of a screwdriver bit, said device being characterized by the fact that it presents:
• a tool positioned substantially perpendicular to the tail, allowing the transmission of a rotation between a motor shaft included in the handle and the pinion, and adapted to engage with said pinion and drive the screw tip.
• the compact counter-angle device allows the practitioner to work optimally with good accessibility and satisfactory visibility.
• the pinions are nestable on all standardized tails screwdriver, which means that all screwdriver specific to each manufacturer can be used and the entire device according to the invention be used with conventional dentistry equipment.
• the device allows a pre-tightening of the screws without reaching the limit set by the manufacturer of the implant by means of a choice of pinion adapted to the maximum permitted tightening torque.
• the pinion slides around the screwdriver bit without continuing the effort on the screw. This clever way of controlling the tightening constitutes an appreciable security.
• gears are achievable depending on the desired screwing torque, these gears are inexpensive compared to the parts conventionally used in the field, in fact the same equipment can be used in different situations and with implants of different manufacturers without need for the practitioner to equip himself systematically with new materials.
• the tool used in combination with the pinion is provided to operate in two opposite directions, by a 180 ° turning of the tool, which allows to reverse the direction of rotation of the pinion and consequently to make a screw or unscrewing by simply turning the tool.
• the pinion fixed on the screwdriver bit is removable and the tool can be removed from its support with the engine connection for the cleaning and sterilization operations.
• Figure 1 is a sectional view of the device according to the invention with a relative positioning of the pinion and the tool for screwing.
• Figure 2 is a sectional view of the device according to the invention with a relative positioning of the pinion and the tool for a unscrewing operation.
• Figure 3 shows a top view of the tool arranged on the screw bit.
• Figure 4 illustrates in side view the device attached to a screwdriver bit.
• FIG. 5 illustrates in section and in plan view gable variants that can be used in the device according to the invention.
• Figure 6 shows two sectional views of a screwdriver bit holder.
• Figure 7 illustrates two sectional views of a screwdriver bit support equipped with a ten-tooth pinion.
• the mechanized device for screwing and unscrewing dental implant abutment screws is adaptable by one end to a handle and the other end to the tail of a screwdriver bit.
• Such a device is shown in section in FIGS. 1 and 2 in the two possible configurations of arrangement of the tool 2 on the shank 1.
• the shank 1 is a calibrated cylindrical portion constituting the body of the screwdriver bit.
• FIG. 1 shows that the shank 1 is inserted into the head body 9 of the tool 2, which tool 2 is thus positioned substantially perpendicular to the screwdriver bit 17 represented by the shank 1 and in the extension of the handle 3.
• the tail 1 comprises a toothed pinion 4 clipped on its periphery.
• the pinion 4 is connected to a toothed wheel 7, which toothed wheel allows the transmission of rotation from the handle 3 to the screwdriver bit 17.
• the handle 3 comprises a drive 5 actuated in rotation by a motor, by motor must be understood any system capable of generating a rotation of the drive 5.
• the energy of rotation is transmitted to a linear shaft 6 in direct contact with the drive.
• Which shaft 6 is terminated at the opposite end, ie inside the head body 9 of the tool, by a toothed wheel 7 which transmits the rotational movement to the pinion 4 by a gear system classically known.
• the shaft 6 is rotated about the axis 16, as the toothed wheel 7 placed at its end.
• the assembly consisting of the head body 9 containing the toothed wheel 7, and the shaft 6 is inserted and held in place by means of a shell 22 forming a protection for the various elements.
• Said shell 22 is preferably made of rigid plastic material, and nested in the handle 3.
• the tool 2 allowing the transmission of the rotation has at its end on the head body 9 an opening 8, visible in Figure 3, adapted to allow the fitting of said tool 2 with the pinion 4, and having on the opposite end of the connection means with the drive connected to a motor. Said tool 2 being positioned substantially perpendicular to the screwdriver tip as shown in the various figures.
• Figure 1 shows a placement of the toothed wheel 7 above the pinion 4, which generates, given the direction of rotation of the motor, a rotational movement in the clockwise direction of the nozzle and therefore a screwing.
• FIG. 2 the tool 2 has been turned 180 ° and engaged in the same manner as previously on the shank 1, in this configuration the toothed wheel 7 is placed under the pinion 4 and transmits a rotational movement to the shank 4. tip counterclockwise, so be a unscrewing movement.
• the turning of the tool 2 to 180 °, and therefore its attachment in the second possible direction with the pinion 4 and the shank 1, allows a change in the direction of rotation of the screw bit.
• the tool 2 can engage or fit into different known means with the handle 3, for example by screwing.
• Figure 3 shows the tool 2 in top view and more particularly the opening 8 allowing a frontal engagement of said tool 2 on the shank 1 of the screwdriver bit.
• a part of the pinion 4 is visible.
• the opening 8 made in the head body 9 of the tool is in the form of a slot 10 ending in a cavity 11.
• the slot 10 has a width smaller than the diameter of the shank 1 so that the screwdriver tip can penetrate forcibly by spreading the lateral portions 12 of the head body and remain trapped in the cavity 11.
• the tail of the screwdriver bit is clamped in the tool so as to allow rotation through the driveline leaving the engine.
• the tail 1, and therefore the tip, can rotate freely in the cavity 11, said cavity having a role of holding the screwdriver.
• FIG. 4 shows a side view of the assembly in working position, in the same configuration as the representation of FIG. 1, this view notably showing a spacing 15 arranged in the head body 9 so as to allow the insertion pinion 4 when the front engagement of the tool on the tail 1.
• the pinion 4 is engaged with the toothed wheel 7 as shown in FIG. 1, the rotation coming from the motor can be transmitted to the screwdriver end then to the stub screw.
• the toothed wheel 7 comprises an axis of rotation advantageously placed in the axis 16 of the tool 2 and the positioning of the toothed wheel above or below the gear 4 oriente the rotation of the screw bit in one direction or the other.
• the pinion 4 is clipped on the shank 1 so as to secure the screwdriver with said pinion and allow the transmission of rotation.
• a screwing tip 17 is illustrated with a pinion 4 fixed on the shank 1 and several pinions referenced 4a to 4g are shown in section and in plan view so as to show different configuration variants.
• the different gears 4a to 4g are provided with different internal arrangements so as to more or less secure this piece with the tail 1.
• the more or less significant connection allows to adjust the maximum screwing torque tolerated applied to the screw.
• the pinion fixing means 4 on the shank 1 of the screwdriver bit 17 determines the maximum tightening torque of the screw.
• the internal arrangement of the pinion 4 and the material constituting said internal arrangement make it possible to adjust the maximum tightening torque of the screw.
• the materials used for the internal arrangement have an important role in the maximum limit of the tightening torque, so a plastic or metallic material, a rubber or silicone seal, will not behave in the same way with respect to friction and the connection between the screw end and the pinion.
• the pinion has an internal arrangement symmetrical with respect to the axis of rotation so that the undeformed internal parts provide guidance of the screwdriver tip in cooperation with the cavity 11 of the head body 9.
• the pinions are clipped, nested in force on the tail of the screwdriver bit, and the tool is engaged in the tail assembly plus pinion however these different elements are removable and can be removed for cleaning and sterilization between periods of operation. In the same way the tool 2 can be detached from the handle 3.
• the gears in different forms, can be arranged directly on the endpiece and in particular on the tail thereof, however, it is envisaged in the context of the invention various other assemblies.
• Figure 6 shows a was 23 in which can be slid or screwed a screwdriver, which tip is not shown in this figure. This was intended to contain the tail of the mouthpiece.
• FIG. 7 illustrates the fact that the spring 23 serves to support a pinion 24 comprising, for example, ten teeth and installed in the same way as in previous examples on the periphery of the cylinder of the. Said pinion 24 can slide axially along the shaft 23.
• This system is of interest as regards the possibility of adjusting the maximum torque transmissible to the stub screws.
• the 23 has two lugs 25 can be tightened to change the limit of the force required to slide the pinion 24 about its axis 26 of rotation when the maximum screw is reached.
• the pinion is solidly placed on a cylindrical piece that can be held on the shank 1 of the screwing bit by clipping and this one-piece piece may comprise a structure cooperating with the shape of the tail of the screwdriver bit.
• the tool is mainly loaded frontally on the pinion, however nothing prohibits side loading in the context of the invention, the head body of the tool can be configured in different ways.
• the transmission of the rotation between the tool and the screwdriver is done through the system of the toothed wheel and pinion, however other means are known to achieve the same purpose, it can for example be used a different gear and other means to ensure the transfer of rotational energy at this level.
• the constituent materials of the pinion and the tool can be very varied in that they meet the criteria of strength, elasticity and more generally the constraints encountered during operation of the device.
• plastics for example PEEK.

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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)
• Dental Prosthetics (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37907841

Family Applications (1)

Country Status (4)

Cited By (3)

Families Citing this family (2)

Citations (5)

• 2006
  • 2006-09-22 FR FR0608297A patent/FR2906130B1/fr not_active Expired - Fee Related
• 2007
  • 2007-06-26 EP EP07803946A patent/EP2066256A1/fr not_active Withdrawn
  • 2007-06-26 WO PCT/FR2007/051530 patent/WO2008034980A1/fr not_active Ceased
• 2008
  • 2008-03-21 TW TW97110246A patent/TW200940035A/zh unknown

Patent Citations (5)

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