Attachment for light polymerization device and charging station for this purpose

Abstract

Charging station (71) for a wireless light polymerization device (52) for curing light-polymerizable dental materials, wherein the light polymerization device (52) comprises a storage device (6) for electrical current, in particular a battery (6) or a capacitor, and wherein the charging station (71) comprises at least one electrically conductive charging contact (58) via which an electrically conductive connection is realized with an electrically conductive counter-charging contact (53) of the light polymerization device (52) for charging the storage device (6) when the light polymerization device (52) is connected to the charging station (71), characterized in that the electrically conductive charging contact (58) is part of an attachment (54) that can be detachably attached to or is attached to the charging station (71), wherein the electrically conductive charging contact (58) in the attachment (54) is electrically conductively connected to at least one second electrically conductive charging contact (68) of the charging station (71).when the attachment (54) is mounted on the charging station (71), wherein the attachment (54) comprises a bridge (55) and charging contact pins (56), each of which has at least one recess (57) through which the electrically conductive charging contact (58) of the attachment (54) extends, and wherein the charging contact pins (56) engage with the electrically conductive charging contact (58) through recesses in a circuit board (65) of the charging station (71) and are electrically connected to the second electrically conductive charging contact (68) of the charging station (71) provided on the circuit board (65).

Description

[0001] The invention relates to a charging station for a wireless light polymerization device for curing light-polymerizable dental materials, wherein the light polymerization device comprises a storage device for electrical current, in particular an accumulator or a capacitor, and wherein the charging station comprises at least one electrically conductive charging contact, via which an electrically conductive connection is realized with an electrically conductive counter-charging contact of the light polymerization device for charging the storage device when the light polymerization device is connected to the charging station.

[0002] The invention also relates to a wireless light polymerization device for curing light-polymerizable dental materials, wherein the light polymerization device comprises a storage device for electrical current, in particular an accumulator or a capacitor, and wherein the light polymerization device comprises at least one electrically conductive charging contact, via which an electrically conductive connection can be established with an electrically conductive counter-charging contact of a charging station for the light polymerization device for charging the storage device when the light polymerization device is connected to the charging station.

[0003] Furthermore, the invention relates to an attachment for connecting a wireless light polymerization device to a charging station and to a light polymerization apparatus comprising a charging station, a hand-held light polymerization device and an attachment.

[0004] Light-curing units are used to cure dental restorative materials. These plastic dental restorative materials are used to create, for example, plastic fillings, dentures, or parts thereof. The light-curing units irradiate the dental restorative materials with a light of a suitable wavelength, and the plastic is cured by the irradiation.

[0005] DE 20 2004 001 189 U1 discloses a light-curing device in the form of a dental handpiece with a housing and an LED arranged therein as a light source that emits blue light. The light-curing device includes a rechargeable battery that powers the LED. Such rechargeable batteries are charged by plugging the light-curing device into a charging station, which is connected to the power grid via a cable to charge the rechargeable battery of the light-curing device. When plugging the light-curing device into the charging station, electrical charging contacts on the light-curing device and the charging station are connected to each other.

[0006] WO2011 / 143454A1 discloses a light-curing device. JP 2006-345670 A discloses a charger. US Pat. No. 7,316,592B2 discloses a charger with a specific contact configuration.

[0007] Charging contacts for Li-ion batteries are typically designed for low voltages (<10 V DC) and low currents (<1 A DC), resulting in a high-quality contact design. Pin, spring-lever, and sliding contacts are common for this purpose. Charging contacts are subject to natural wear and tear with intensive use and aging, or to contamination resulting from use. Through appropriate design and material selection, such as gold plating of the charging contacts, this wear can be reduced but not prevented. Attempts by the user to clean them are also ineffective, as this could damage the charging contact or its surface. Currently, charging stations for light-curing units use permanently installed charging contacts, contact pairs, or strips. If worn or defective, these contacts inhibit the charging function, rendering the entire charging station or light-curing unit unusable.

[0008] The disadvantage of this is that the electrical charging contacts through which the battery is charged wear out, and therefore the service life of the charging stations and light-curing devices is limited or at least parts of the devices need to be repaired.

[0009] The object of the invention is therefore to overcome the disadvantages of the prior art. In particular, a way is to find a way to reduce the effort caused by wear and tear on the charging contacts. In particular, the cost of repairing the charging contacts is to be reduced.

[0010] The object of the invention is achieved by a charging station for a cordless light polymerization device for curing light-polymerizable dental materials, wherein the light polymerization device comprises a storage device for electrical current, in particular an accumulator or a capacitor, and wherein the charging station comprises at least one electrically conductive charging contact, via which an electrically conductive connection is realized with an electrically conductive counter-charging contact of the light polymerization device for charging the storage device when the light polymerization device is connected to the charging station, in which the electrically conductive charging contact is part of an attachment that is detachably attachable or attached to the charging station, wherein the electrically conductive charging contact in the attachment is electrically conductively connected to at least one second electrically conductive charging contact of the charging station when the attachment is attached to the charging station,wherein the attachment comprises a web and charging contact pins, in each of which at least one recess is provided through which the electrically conductive charging contact of the attachment extends, and wherein the charging contact pins with the electrically conductive charging contact engage through recesses of a circuit board of the charging station and are electrically connected to the second electrically conductive charging contact of the charging station provided on the circuit board.

[0011] According to the invention, a cordless light-curing device is not defined as a device whose construction is completely free of cables, but rather as one that is not connected to an external power source, such as a power outlet, via a cable. Preferably, the cordless light-curing device is handheld. The device can then be easily inserted with one hand. A charging contact of the attachment refers to both the part that provides an electrical connection by contact with a mating contact, as well as the connection within the attachment from one contact point to the next.

[0012] In charging stations according to the invention, it can be provided that the electrically conductive connection is a plug connection.

[0013] Plug connections are simple and cost-effective to implement and are easy to use.

[0014] Furthermore, it can be provided that the attachment comprises a fastening element with which the attachment can be fastened or is fastened to the charging station, wherein preferably the fastening element is a thread which engages in a mating thread of the charging station, and / or the fastening element is at least one screw with which the attachment can be screwed or is screwed to the charging station.

[0015] These fastening elements create a stable connection between the attachment and the charging station, which can also withstand the mechanical stresses of a plug-in process.

[0016] According to a further embodiment of the invention, it can be provided that the attachment is lockable or locked with the charging station and / or the attachment forms a bayonet lock with the charging station.

[0017] These fasteners can be connected quickly and easily and therefore offer improved ease of use.

[0018] According to a further particularly advantageous embodiment of the invention, it can be provided that at least one charging contact, preferably the electrically conductive charging contact of the attachment, comprises at least in some regions a coating, preferably a refinement, particularly preferably a precious metal coating, and / or the attachment comprises two charging contact pins or a USB interface which contain the charging contact.

[0019] This design ensures stable and secure electrical contact. Of course, only those parts of the charging contact that have a surface that can come into contact with a mating contact need to be coated. The wiring inside the attachment is uncoated.

[0020] The objects of the invention are also achieved by a wireless light polymerization device for curing light-polymerizable dental materials, wherein the light polymerization device comprises a storage device for electrical current, in particular a battery or a capacitor, and wherein the light polymerization device comprises at least one electrically conductive charging contact, via which an electrically conductive connection can be established with an electrically conductive counter-charging contact of a charging station for the light polymerization device for charging the storage device when the light polymerization device is connected to the charging station, in which the electrically conductive charging contact is part of an attachment that can be detachably attached or is attached to the light polymerization device, wherein the electrically conductive charging contact in the attachment is electrically conductively connected to at least one second electrically conductive charging contact in the light polymerization device,when the attachment is attached to the light-curing device, the attachment comprising a web and charging contact pins, each of which has at least one recess through which the electrically conductive charging contact of the attachment extends.

[0021] It can be provided that the electrically conductive connection is a plug connection.

[0022] Furthermore, it can be provided that the attachment comprises a fastening element with which the attachment can be fastened or is fastened to the light polymerization device, wherein preferably the fastening element is a thread which engages in a mating thread of the light polymerization device, and / or the fastening element is at least one screw with which the attachment can be screwed or is screwed to the light polymerization device.

[0023] According to a further particularly preferred embodiment of the invention, it can be provided that the attachment can be locked or is locked with the light polymerization device and / or the attachment forms a bayonet closure with the light polymerization device.

[0024] The advantages of these last embodiments are the same as those described for the charger attachment.

[0025] Furthermore, it can be provided that the light polymerization device comprises a light source, preferably an LED for curing a polymerizable plastic, which preferably emits light with a wavelength between 380 nm and 500 nm, particularly preferably comprising at least two wavelength peaks, most preferably between 400 nm and 405 nm and 455 nm and 460 nm.

[0026] These wavelengths are particularly well-suited for achieving light polymerization. These wavelengths are particularly well-suited for dental resins.

[0027] According to the invention, it can also be provided that the LED light source has a power range of 800 mW / cm 2 up to 2000 mW / cm 2 radiates, preferably between 1200 mW / cm 2 and 1800 mW / cm 2 .

[0028] It can also be provided that the light polymerization device includes charge control electronics with which the charging of the power storage device is controlled or regulated.

[0029] The integration of the charging control electronics (controller) into the handpiece, i.e. into the light polymerization unit, has the advantage that a compact design is ensured and the charging control electronics can directly access the accumulator or the storage device for electrical energy.

[0030] In the case of light polymerization devices according to the invention, it can also be provided that at least one charging contact, preferably the electrically conductive charging contact of the attachment, comprises a coating at least in some areas, preferably a refinement, particularly preferably a precious metal coating, and / or the attachment comprises two charging contact pins or a USB interface which contain the charging contact.

[0031] The objects of the invention are also achieved by an attachment for connecting a wireless light polymerization device to a charging station, wherein the attachment is suitable for attachment to such a charging station and / or to such a light polymerization device.

[0032] A further solution to the objects of the invention can be achieved by a light polymerization apparatus comprising a charging station, in particular a charging station according to the invention, a hand-held light polymerization device, in particular a light polymerization device according to the invention, wherein the light polymerization device comprises at least one storage device for electrical current, preferably an accumulator, and the light polymerization device comprises at least one attachment with a charging contact and wherein the attachment or attachments can be or are attached to the charging station and / or the attachment or attachments can be or are attached to the light polymerization device, wherein the attachment or attachments provide or provide at least one electrically conductive connection via which the storage device for electrical current can be charged.

[0033] In all embodiments of the invention with a rechargeable battery in the light polymerization device, it can be provided that the rechargeable battery is a Li-ion rechargeable battery.

[0034] The invention is based on the surprising discovery that a replaceable attachment in which the charging contact is integrated makes it possible to provide a light-curing device or a charging station for such a light-curing device in which the charging contact can be renewed simply by replacing the attachment. Because the wearing part, namely the charging contact, is integrated into an easily replaceable attachment, costly repairs to the light-curing device or the charging station for the light-curing device can be avoided.

[0035] The invention is based on the surprising idea of ​​dividing the actual charging contact (bracket, pin, tab, spring, etc.) into two consecutively arranged contacts and making the wear-prone working contact (charging station opposite light-curing unit / handpiece) easily accessible, even for untrained users, using a mountable attachment (adapter or insert). The cascade contacts thus formed have a longer service life and can be replaced as often as needed by the user of the light-curing unit.

[0036] State-of-the-art charging contacts are permanently connected to the charging station or the light-curing unit, or rather, to the electronics of the latter. In the event of a defect, such charging stations and light-curing units require replacement or repair by the manufacturer or a service representative. Considering the material cost of the contacts compared to the resulting effort, this is an uneconomical approach compared to the charging stations and light-curing units according to the invention.

[0037] An example of a structure according to the invention is a light polymerization apparatus for dental restoration materials comprising a light polymerization device as a handpiece with an LED light source, wherein the LED light source operates in a single or multiple wavelength range from 380 nm to 500 nm, in particular with at least two wavelength peaks, preferably in two wavelength ranges from 400 nm to 405 nm and 455 nm to 460 nm, wherein the LED light source operates in a power range of 800 mW / cm 2 up to 2000 mW / cm 2 radiates, preferably between 1200 mW / cm 2 and 1800 mW / cm 2 , and the light polymerization device comprises a replaceable and rechargeable battery, preferably a Li-ion battery, in the handpiece, which can be charged and / or supplied with voltage by a separate base station or charging station of the light polymerization device, wherein the light polymerisation device is designed with at least two charging contact parts in the handpiece and / or the charging station as cascade contacts, the working contacts are integrated into an attachment, such as an adapter or an insert, which can be replaced by the customer through simple actions, the power supply of the charging station is via USB interfaces and a charging control electronics that is completely located in the handpiece.

[0038] The cascade contact is implemented in the form of a series circuit, with the charging contacts connected in series.

[0039] The present invention replaces the “wear charging contact” with a separate integrated but easily removable partial housing (the attachment), which in turn is connected to the actual charging housing with the same or different charging contacts.

[0040] Further embodiments of the invention are explained below with reference to four schematically illustrated figures, without, however, limiting the invention. In the following: Fig. 1: a schematic cross-sectional view of a light polymerization apparatus according to the invention comprising a light polymerization device, a charging station and an attachment; Fig. 2: a schematic cross-sectional view of a particularly preferred embodiment of an attachment according to the invention inserted into a charging station with an inserted light polymerization device; Fig. 3: a schematic perspective view of a charging station according to the invention with an unattached attachment according to the invention; and Fig. 4: a schematic perspective view of the underside of the charging station according to the invention according to Fig. 3 with an attachment according to the invention ready for insertion.

[0041] Fig. 1 shows a schematic cross-sectional view of a light polymerization device according to the invention, comprising a charging station 1 connected to a power supply, a handheld light polymerization device 2, and an attachment 4. The light polymerization device 2 (handpiece) comprises, in its housing, in the region of a handle body designed to be held in one hand, a replaceable battery 6. The battery is preferably a lithium-ion battery. A first electrical charging contact 8, comprising two metal pins and thus configured in the manner of a plug, is arranged at the bottom end of the light polymerization device 2. The charging contact 8 is connected to the battery 6 via two electrical lines 10, so that when an electrical voltage is applied to the metal pins of the electrical charging contact 8, the battery 6 can be charged.

[0042] Also located inside the handle of the light polymerization device 2 is a controller 12, which, among other things, is intended to control the charging process of the rechargeable battery 6. Furthermore, the controller 12 is suitable for processing signals from an input device 14, which can also be a simple switch or a rotary control. Using the input device 14, the light polymerization device 2 can at least be switched on and off, wherein preferably the power of the emitted light and / or the duration of the illumination can also be adjusted. The controller 12 can also control a display device (not shown), such as one or more LEDs, so that the user can see whether the light polymerization device 2 is currently being charged and / or whether the light polymerization device 2 is fully charged.The controller 12 also processes the signals from the input device 14 and, on the basis of these signals, controls an LED 16 which can emit white or blue light suitable for curing a polymerizable plastic.

[0043] The light-curing device 2 is inserted with its metal pins into the attachment 4, which for this purpose comprises two metal-lined recesses for the metal pins of the first charging contacts 8 at the corresponding locations. The recesses in the attachment can comprise springy, elastic metal clips, thus forming a spring contact. The recesses are connected via electrical lines 20 in the attachment 4 to an electrical charging contact 18 of the attachment 4, which comprises two metal pins. The springy, elastic metal clips also belong to the charging contact 18 of the attachment. The attachment 4 thus forms a cascade connector.

[0044] The attachment 4 is inserted with the metal pins of the second charging contact 18 into electrically conductive recesses of the charging station 1 and is fastened via a thread (not shown) to a mating thread of the charging station 1 (not shown). The charging station 1 is essentially a stand that enables the charging station 1 to be set up securely. However, the charging station 1 can also be attached to a wall or pole using a bracket. Two electrical lines 22, which run inside the charging station 1, electrically connect the recesses of the charging station 1 to a power cable 24, which ends in a power plug 26, with which the charging station 1 can be connected to a socket for a standard power grid. If necessary, a transformer (not shown) can be provided in the charging station 1, the power cable 24 or the power plug 26.

[0045] When the light-curing device 2 is connected to the charging station 1 via the attachment 4, the accumulator 6 is charged, controlled by the controller 12. When the metallized recesses in the attachment 4 become worn through frequent use, the attachment 4 can be unscrewed from the charging station 1 and simply replaced with a new attachment 4 with intact recesses. Because of the easy replaceability of the attachment 4, it can be particularly advantageous for the metals and / or the coating of the recesses of the attachment 4 to be less hard than the metal pins of the charging contact 8 of the light-curing device 2, so that the charging contact 8 wears only slowly and the signs of wear occur primarily at the recesses of the replaceable attachment 4.

[0046] As an alternative to the embodiment shown, the attachment 4 could also be permanently connected to the light-curing device 2. However, this would increase the weight of the handheld light-curing device 2. Therefore, attaching the attachment 4 to the charging station 1 is preferred in order to keep the weight of the handheld light-curing device 2 as low as possible.

[0047] It could also be provided to attach an attachment 4 to both the light-curing device 2 and the charging station 1. Wear on the charging contacts would then only occur in the recesses of the first attachment 4 on the charging station 1 and the charging contacts (metal pins) of the second attachment (not shown). This design can consistently prevent wear on the charging contacts of the light-curing device 2 and the charging station 1. This design is particularly preferred as a general principle for all embodiments of the invention and is not limited to the present exemplary embodiment.

[0048] To ensure good electrical contact, the recesses and metal pins can be coated with a metal layer that prevents oxidation of the contact surfaces. Oxidation would lead to a deterioration of the electrical contact. In this case, expensive gold coatings or similarly costly precious metal coatings are not necessary, since the longevity of the recesses and charging contacts 18 of the attachments 4 is not essential. This is also to be understood as a preferred general principle of the invention and is not limited to the present embodiment.

[0049] Fig. Figure 2 shows a schematic cross-sectional view of a particularly preferred embodiment of an attachment 54 according to the invention inserted into a charging station (of which Fig. 2 only one board 65 is shown) with inserted light polymerization device 52, of which only the lower part in Fig. 2. The light polymerization device 52 comprises two metallic ring contacts 53 as charging contacts, which are electrically insulated from one another and connected to a rechargeable battery (not shown) inside the light polymerization device 52. The rechargeable battery can be charged via the ring contacts 53 by applying an electrical voltage, which can be regulated or controlled by a controller (not shown) of the light polymerization device 52.

[0050] The attachment 54 comprises a web 55 and two charging contact pins 56 made of plastic. The plastic parts can be manufactured using an injection molding process. A recess 57 is provided in each charging contact pin 56, through which two charging contact springs 58 of the attachment 54 extend, thus establishing electrical contact with the ring contacts 53 of the light-curing device 52 used. The charging contacts 58 are narrow, curved, pre-tensioned metal strips (charging contact springs) that are attached to the charging contact pins 56 by a fixing 59. The fixing 59 can be realized by screws or rivets. In principle, permanent adhesive bonding is also conceivable.

[0051] Two reinforced recesses 57 are provided in the web 55 as screw holes 60. These screw holes 60 allow the attachment 54 to be firmly connected to the charging station. For this purpose, the charging station includes two matching recesses with internal threads (not shown). The charging contact pins 56 with the charging contact springs 58 engage through two recesses in a circuit board 65 of the charging station. A spacer 66 is provided on the circuit board 65, which ensures the correct position of the fully inserted light-curing device 52 by defining an end stop.

[0052] Two metallic contact surfaces 68 are provided on the circuit board 65 as the charging contacts of the charging station. The circuit board 65, the spacer 66, and the contact surfaces 68 are part of the charging station and are firmly and rigidly connected to it. When the attachment 54 is attached to the charging station, one end of the metallic leaf spring 58 presses against the contact surfaces 68, thus establishing an electrically conductive connection between the charging contact spring 58 of the attachment 54 and the electrical lines of the charging station connected to the contact surfaces 68.When the light polymerization device 52 is inserted into a recess provided for it (not shown) in the charging station, the other ends of the charging contact spring 58, or a curvature of the charging contact spring 58 on the other side of the fixation 59, press onto the ring contacts 53 of the light polymerization device 52 and thus establish an electrical connection between the ring contacts 53 and the contact surfaces 68 via the charging contact spring 58.

[0053] The contact surfaces 68 are connected to a power grid or other voltage source by connecting the charging station to a socket via the electrical wires and a cable as well as a power plug.

[0054] Fig. 3 shows a schematic perspective view of a charging station 71 according to the invention with a non-attached attachment 54 according to the invention. The attachment 54 is constructed as in Fig. 2. The attachment 54 comprises a web 55 as a base in which two passages for two screws 90 are provided, with which the attachment 54 can be fastened in the floor of the charging station 71 from below.

[0055] Two charging contact pins 56, which carry the charging contact springs 58 and the charging contact spring 58 of the attachment 54, are arranged at a right angle to the web 55. The web 55 and the charging contact pins 56 are made as a single piece from plastic. The attachment 54 is inserted from below into the charging station 71 in the area of ​​a recess (receptacle for a light polymerization device) 72 for inserting a light polymerization device (not shown) and is fastened there with the screws 90. The lines drawn in the recess (receptacle for a light polymerization device) 72 and on the front of the charging station 71 are intended merely to indicate the orientation of the walls in perspective and have no further significance here. A rail could also be provided in this area, allowing the insertion of a light polymerization device / handpiece in only one orientation. The recess 72 has a round cross-section.

[0056] The charging station 71 includes a light-emitting diode (LED) 74, which serves to indicate the charge level of an energy storage device of a light-curing device in use. Additionally or alternatively, the LED 74 serves as an indicator for a connected power supply via a power cable 78. The LED 75 serves as an indicator of the light intensity measured by a sensor 76.

[0057] Fig. 4 shows a schematic perspective view of the underside of the charging station 71 according to the invention according to Fig. 3 with an attachment 54 according to the invention ready for insertion. As in Fig. 4, the attachment 54 is inserted into a suitable recess on the underside of the charging station 71. The attachment 54 could therefore also be referred to as an insert 54. The charging contact pins 56 extend through a circuit board (not shown) that carries the charging contacts in the form of two contact surfaces (not shown) of the charging station 71, as shown in Fig. 2 and extend into the recess 72 (which is shown in Fig. 3). There, the leaf springs 58 of the charging contact spring 58 can be connected to the mating contacts of a light-curing device by inserting the light-curing device into the recess 72. The contact surfaces of the charging station are also contacted by the other ends of the leaf springs 58 of the charging contact spring 58. The contact surfaces are connected to a voltage source via a power cable 78.

[0058] The attachment / insert 54 is fastened with the screws 90, which are guided through the screw holes 60, in the threaded holes 77, which include a counter thread for the screws 90.

[0059] Four rubberized feet 73 are arranged on the underside of the charging station 71, which ensure that the charging station 71 remains stable even when inserting and removing the light polymerization device.

[0060] The features of the invention disclosed in the foregoing description, as well as in the claims, figures and embodiments, may be essential both individually and in any combination for the realization of the invention in its various embodiments. List of reference symbols 1, 71 charging station 2, 52 Light polymerization unit 4, 54 attachment / insert 6 Accumulator 8, 18 charging contact 10, 20, 22 Electrical cable 12 Control 14 Input device / switch / rotary control 16 LEDs for light polymerization 24.78 Cable or power cable 26 plugs 53 Ring contact 55 jetty 56 Charging contact pin 57 recess 58 charging contact spring / leaf spring 59 Fixation 60 screw hole 65 circuit board 66 spacers 68 contact surface 72 Holder for light polymerization unit / hand-held unit 73 Stand 74 LEDs to indicate a connected power supply 75 Display of the light intensity measured by a sensor 76 76 Sensor 77 threaded hole 78.24 Power cord or cable 90 screw

Claims

[1] Charging station (71) for a wireless light polymerization device (52) for curing light-polymerizable dental materials, wherein the light polymerization device (52) comprises a storage device (6) for electrical current, in particular an accumulator (6) or a capacitor, and wherein the charging station (71) comprises at least one electrically conductive charging contact (58), via which an electrically conductive connection with an electrically conductive counter-charging contact (53) of the light polymerization device (52) for charging the storage device (6) is realized when the light polymerization device (52) is connected to the charging station (71), characterized bythat the electrically conductive charging contact (58) is part of an attachment (54) which is detachably attachable or attached to the charging station (71), wherein the electrically conductive charging contact (58) in the attachment (54) is electrically conductively connected to at least one second electrically conductive charging contact (68) of the charging station (71) when the attachment (54) is attached to the charging station (71), wherein the attachment (54) comprises a web (55) and charging contact pins (56), in each of which at least one recess (57) is provided, through which the electrically conductive charging contact (58) of the attachment (54) extends, and wherein the charging contact pins (56) with the electrically conductive charging contact (58) engage through recesses in a circuit board (65) of the charging station (71) and are electrically conductively connected to the second electrically conductive charging contact (68) of the charging station provided on the circuit board (65). (71) are connected. [2] Charging station (71) according to claim 1, characterized bythat the electrically conductive connection is a plug connection. [3] Charging station (71) according to claim 1 or 2, characterized by that the attachment (54) comprises a fastening element (90) with which the attachment can be fastened or is fastened to the charging station (71), wherein preferably the fastening element is a thread which engages in a mating thread of the charging station (71), and / or the fastening element (90) is at least one screw (90) with which the attachment (54) can be screwed or is screwed to the charging station (71). [4] Charging station (71) according to one of the preceding claims, characterized by that the attachment (54) is lockable or locked with the charging station (71) and / or the attachment (54) forms a bayonet lock with the charging station (71). [5] Charging station (71) according to one of the preceding claims, characterized bythat at least one charging contact (53, 58, 68), preferably the electrically conductive charging contact (58) of the attachment (54), comprises at least in some regions a coating, preferably a refinement, particularly preferably a precious metal coating, and / or the attachment comprises two charging contact pins (56) or a USB interface which contain the charging contact (58). [6] Wireless light polymerization device (52) for curing light-polymerizable dental materials, wherein the light polymerization device (52) comprises a storage device (6) for electrical current, in particular an accumulator (6) or a capacitor, and wherein the light polymerization device (52) comprises at least one electrically conductive charging contact (58), via which an electrically conductive connection can be established with an electrically conductive counter-charging contact (68) of a charging station (71) for the light polymerization device (52) for charging the storage device (6) when the light polymerization device (52) is connected to the charging station (71), characterized byin that the electrically conductive charging contact (58) is part of an attachment (54) which is detachably attachable or attached to the light polymerization device (52), wherein the electrically conductive charging contact (58) in the attachment (54) is electrically conductively connected to at least one second electrically conductive charging contact (53) in the light polymerization device (52) when the attachment (54) is attached to the light polymerization device (2, 52), wherein the attachment (54) comprises a web (55) and charging contact pins (56), in each of which at least one recess (57) is provided, through which the electrically conductive charging contact (58) of the attachment (54) extends. [7] Light polymerization device (52) according to claim 6, characterized by that the electrically conductive connection is a plug connection. [8] Light polymerization device (52) according to claim 6 or 7, characterized byin that the attachment (54) comprises a fastening element (90) with which the attachment (54) can be fastened or is fastened to the light polymerization device (52), wherein preferably the fastening element is a thread which engages in a mating thread of the light polymerization device (52), and / or the fastening element (90) is at least one screw (90) with which the attachment (54) can be screwed or is screwed to the light polymerization device (52). [9] Light polymerization device (52) according to one of claims 6 to 8, characterized by that the attachment (54) is lockable or locked with the light polymerization device (52) and / or the attachment (54) forms a bayonet lock with the light polymerization device (52). [10] Light polymerization device (52) according to one of claims 6 to 9, characterized bythat the light polymerization device (52) comprises a light source (16), preferably an LED (16) for curing a polymerizable plastic, which preferably emits light with a wavelength between 380 nm and 500 nm, particularly preferably comprising at least two wavelength peaks, most preferably between 400 nm and 405 nm and 455 nm and 460 nm. [11] Light polymerization device (52) according to one of claims 6 to 10, characterized by that the light polymerization device (52) comprises charge control electronics (12) with which the charge of the power storage device (6) is controlled or regulated. [12] Light polymerization device (52) according to one of claims 6 to 11, characterized bythat at least one charging contact (53, 58, 68), preferably the electrically conductive charging contact (58) of the attachment (54), comprises at least in some regions a coating, preferably a refinement, particularly preferably a precious metal coating, and / or the attachment (54) comprises two charging contact pins (56) or a USB interface which contain the charging contact (58). [13] Attachment (54) for connecting a wireless light polymerization device (52) to a charging station (71), wherein the attachment (54) is suitable for attachment to a charging station (71) according to one of claims 1 to 5 and / or to a light polymerization device (52) according to one of claims 6 to 12. [14] Light polymerization apparatus comprising a charging station (71), in particular according to one of claims 1 to 5, a hand-held light polymerization device (52), in particular according to one of claims 6 to 12, wherein the light polymerization device (52) comprises at least one storage device (6) for electrical current, preferably an accumulator (6), and the light polymerization device (52) comprises at least one attachment (54) with a charging contact (58), and wherein the attachment (54) or the attachments (54) can be or are fastened to the charging station (71) and / or the attachment (54) or the attachments (54) can be or are fastened to the light polymerization device (52), wherein the attachment (54) or the attachments (54) provide or provide at least one electrically conductive connection (58) via which the storage device (6) for electrical current can be charged.

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