Patent Application
20190247169
This invention generally relates to common placement support for ensuring correct placement of artificial teeth in a denture base. In particularly, the invention relates to common placement supports provided during 3D printing for ensuring placement of artificial teeth in a denture base.
When digitally designing and manufacturing dentures it is important that the dental setup of the digital design is transferred to the final manufactured model. In particular when the denture is formed of a denture base (mainly representing the gingiva) and several artificial teeth it may be difficult to place the artificial teeth in the exact position as in the design and desired to obtain the desired occlusion, functionality and/or esthetics for the patient.
In order to solve this problems different solutions have been proposed, see for example US 2016/0256247 A1, which proposes the use of a dental transfer template and EP 1 444 965 A1, which proposes the use of positioning aids on the prosthesis base.
However, in some situations the manufacturing method used to manufacture the artificial teeth may also provide for alternative and/or further means for improve the positioning of the artificial teeth in the denture base as will be disclosed herein.
In one aspect there is disclosed a method for manufacturing a denture comprising a denture base and at least two artificial teeth arranged in the denture base, wherein the method comprises the steps of:
By manufacturing the at least two artificial teeth with a common placement support connected thereto it is ensured that the desired relative arrangement is maintained during handling of the two artificial teeth.
Accordingly, this ensures that the desired relative arrangement is maintained when the at least two artificial teeth are placed in the denture base and thus the desired esthetics and functionality of the final denture is obtained.
The denture design can be obtained in many different ways. However, by using digital design software/computer aided design (CAD) software the process can be facilitated. For example, an existing denture can be scanned using a desktop scanner and based on this scan a new digital denture design can be provided, either by using the old shape or basing a new design on the old shape. In another embodiment the oral cavity of the patient is scanned using an intra-oral scanner and the denture design can be designed to fit into the scanned oral cavity. The user can use many different digital design tools to perfect the digital denture design.
The digital denture is also segmented, i.e. separated, into the digital denture base and the digital artificial teeth in order to manufacture these parts separately.
Based on the digital denture design the denture base and the artificial teeth are manufactured separately. This is done since the denture base should be manufactured in a material that resembles the gum surface and the teeth should be manufactured in a material that resembles the teeth.
The current disclosure seeks to alleviate issues with placing the artificial teeth in the denture base when these parts are manufactured separately.
To further facility manufacturing the common placement support and the at least two artificial teeth are manufactured as one unit, for example by producing the parts in one production step using the same material.
In one embodiment the method further comprises the step of removing the common placement support which is advantageous in case the common placement support has been placed in an area that normally visible when the patient wears the final denture.
Manufacturing can for example be done by a subtractive manufacturing method, such as milling, or by an additive manufacturing method, such as 3D printing. This manufacturing methods are both able to provide the common placement support and the at least two artificial teeth in one production step as discussed above.
One particular advantage when using additive manufacturing, such as 3D printing, is that the support sprues created during production can be used as the common placement support if the manufacturing is planned correctly.
In one embodiment the common placement support is connected to the occlusal surfaces of the at least two artificial teeth. This ensures that the artificial teeth can be placed without obstruction.
In an alternative embodiment the common placement support is connected to the lingual surface of the artificial teeth. This can be advantageous since the lingual surface are facing inwards towards the oral cavity and thus do not affect the visual esthetics of the final denture or the occlusion and accordingly facilitates the removal of the common placement support.
In another aspect there is disclosed a method for digitally planning the manufacturing of at least two digital artificial teeth provided in a digitally designed denture comprising a digital denture base and the least two digital artificial teeth, wherein the method comprises the steps of:
By maintaining the desired relative arrangement of the artificial teeth during planning of the manufacturing it is possible to avoid individual post-manufacturing handling of the respective artificial teeth and thereby improve correct positioning of the artificial teeth in the denture base.
As discussed above the digital designed denture can be obtained in different ways, e.g. based on a scan of a previous denture or designed from the ground up based on an intra oral scan of the patients oral cavity.
In one embodiment a digital common placement support representing the common placement support and the at least two digital artificial teeth are digitally designed as one unit.
In particular with respect to computerized manufacturing processes (CAM) where the digital common placement support and the at least two digital artificial teeth are prepared to be manufactured by a subtractive manufacturing method, such as milling, or by an additive manufacturing method, such as 3D printing, is it advantageous to use the disclosed method.
Using these manufacturing processes the common placement support and the artificial teeth are manufactured simultaneously, which allows the artificial teeth to be handled subsequently without altering the desired relative arrangement.
In one embodiment the digital common placement support is connected to the occlusal surfaces and/or the lingual surfaces of the at least two digital artificial teeth.
In one aspect there is disclosed a denture assembly comprising a denture base and at least two artificial teeth with a common placement support connected to the at least two artificial teeth for keeping the at least two artificial teeth in a desired relative arrangement.
In one embodiment the at least two artificial teeth and the common placement support is formed as one unit. Preferably formed of the same material.
In a further embodiment the common placement support extends from the proximal ends of the at least two artificial teeth, which is placed in the gingiva, and halfway towards the distal end of the artificial tooth, which is facing away from the artificial gingiva.
In yet another embodiment the common placement support is visibly hidden when the at least two artificial teeth are arranged in the artificial gingiva. This can for example be done by forming a common placement support which extends below the edge of a recess, which is provided in the artificial gingiva wherein the artificial teeth is at least partly arranged.
To accommodate the artificial teeth and the common placement support, the artificial gingiva is in one embodiment formed with one single continuous recess for receiving the proximal ends of the at least two artificial teeth and the common placement support.
The current disclosure can be applied to many types of dentures where at least two artificial teeth are needed. This can for example be partial denture, full denture, implant retained denture and/or removable dentures.
The above and/or additional objects, features and advantages of the present invention, will be further elucidated by the following illustrative and non-limiting detailed description of embodiments of the present invention, with reference to the appended drawings, wherein:
In the following description, reference is made to the accompanying figures, which show by way of illustration how the invention may be practiced.
The common placement support 3 is a result of the 3D printing process. Previously the common placement support 3 was removed right after manufacturing of the teeth, but by manufacturing the teeth in the desired relative arrangement the common placement support 3 is kept in order to keep the teeth in their arrangement during handling.
Accordingly, the teeth are placed in the recesses 4 in the denture base 1 and subsequently attached to the denture base 1, e.g. by gluing, with the common placement support connected to the teeth. This ensure optimal positioning of the teeth in the denture base and thereby achieving the occlusion of the final denture. When the glue has cured the common placement support can be removed.
In some situations, it is desired to have anterior teeth with improved esthetics, while the posterior teeth can have a simple finish as long as they are functional.
The dental technician can easily place and glue the posterior teeth 202 in the respective recesses 204 in denture base 200 knowing that the correct arrangement and thereby occlusion is ensured. When the glue has cured the dental technician removes the common placement support.
In one such embodiment as illustrated in
As can be seen, the planning of the 3D printing is done so that the common placement supports are connected to the lingual side of the artificial teeth.
Similarly, in the embodiment in
Although some embodiments have been described and shown in detail, the invention is not restricted to them, but may also be embodied in other ways within the scope of the subject matter defined in the following claims. In particular, it is to be understood that other embodiments may be utilised and structural and functional modifications may be made without departing from the scope of the present invention.
In device claims enumerating several means, several of these means can be embodied by one and the same item of hardware. The mere fact that certain measures are recited in mutually different dependent claims or described in different embodiments does not indicate that a combination of these measures cannot be used to advantage.
The digital features and steps of the methods described above and in the following may be implemented in software and carried out on a data processing system or other processing means caused by the execution of computer-executable instructions. The instructions may be program code means loaded in a memory, such as a RAM, from a storage medium or from another computer via a computer network. Alternatively, the described features may be implemented by hardwired circuitry instead of software or in combination with software.
The system comprises a unit 558 for transmitting the at least two digital artificial teeth to e.g. a computer aided manufacturing (CAM) device 559, such as a milling machine or a 3D printer as disclosed.
Yet a further embodiment of a denture assembly 600 comprising a denture base 601 and artificial teeth 602 is shown in
The common placement support is provided such that it is visibly hidden when the artificial teeth are placed in the denture base 601. This is provided by designing the common placement support so that it is below the gingiva edge of the recess 604 when the artificial teeth are placed in the denture base.
Furthermore, to receive both the artificial teeth and the common placement support a single continuous recess 604 is formed in the artificial gingiva.
| Number | Date | Country | Kind |
|---|---|---|---|
| PA 2016 70792 | Oct 2016 | DK | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2017/075810 | 10/10/2017 | WO | 00 |
