DE202019101389U1 - plinth - Google Patents

Abstract

Base plate (1) for arranging a toothed ring (2) with arranged on its underside centering elements (5) and at least one arranged adhesive element (9), wherein the base plate (1) has bores (4) for receiving guide pins (8), the Serve attachment of the ring gear (2), characterized in that the bores (4) have a shoulder (10) which is designed to serve as an abutment for the guide pins (8) cooperating guide sleeves (6).

Description

The present invention relates to a base plate for use in dental model making.

Due to the recent increasing use of an intra-oral scanner in the dental practice, the manufacturing method of dental working models is changing. In contrast to the classic method with impression tray and impression mass, the dentist only uses the scanner to generate a data set. This can then be used subsequently to produce the desired sprocket by means of rapid prototyping.

In particular, the additive 3D printing process is increasingly used here. From the scan data set the sprocket is printed in a simple way, whereby in the laboratory mostly the SLS (Selective Laser Sintering) and partly also the SLA method (Stereolithography) are used.

The ring gear based on the data set is built up layer by layer on a build platform in the 3D printer. This build platform is usually oriented horizontally and removably attached to a device in the 3D printer.

The functional principle of 3D printing is known per se. The contour of the sprocket is projected layer by layer into a tree medium by laser radiation. The tree medium reacts with the laser radiation and selectively hardens. Depending on the process comes as Baumedium a plastic resin or a plastic powder used.

So far, it is customary, after completion of the printing phase, to remove the sprocket from the build platform by operating, in particular, a lift-off tool, in particular with the SLA method, by means of which the sprocket is levered off the build platform in a simple manner. Subsequently, the sprocket is optionally postcured and cleaned and mechanically reworked.

In a subsequent step, the sprocket is then mounted on a base plate. This combination of sprocket and base plate is what the specialist calls "saw-cut model". The characteristic feature of a Sägespnittmodells is that by sawing the sprocket into individual segments they are individually removable from the base plate, since these are guided and fastened on guide pins on the base plate. For example, German patent application no. 10 2017 002 618 the Applicant a method in which sprocket and base plate are positioned over a device to each other and are pierced in one operation to produce aligned holes, which serve to receive the guide pins.

Practice has shown, however, that due to the material properties of the plastics used in prototyping on the one hand and the current, also made of plastic base plates may under certain circumstances dimensional deviations occur. The uniform friction between the guide pin and the bore required by the specialist can therefore not always be guaranteed, let alone that it would be reproducible.

In order to counteract these tolerance fluctuations, the use of slightly flexible and slidable guide sleeves, which are predominantly made of PE, is provided in the art. This compensates for these inaccuracies and allows for uniform friction in conjunction with the guide pins.

The sleeve is pressed into the base plate or even glued. However, the difficulty in inserting the guide sleeve in the base plate is in particular to comply precisely with the required setting depth. During subsequent gluing, adhesive can enter the pin guide of the sleeve and make it unusable. To avoid inadvertent removal of the guide sleeve, for example, when removing the ring gear or sprocket segments from the base plate, it must be practically always glued.

Proceeding from this, the present invention seeks to avoid the disadvantages mentioned above and to provide a base plate, which ensures a faultless positioning and secure holding of the guide sleeves in the use of the base plates.

This object is achieved with a base plate according to claim 1 and with a device according to claim 4.

Consequently, in one aspect, the invention relates to a base plate for arranging a sprocket with arranged on its underside centering elements and at least one arranged adhesive element, wherein the base plate has bores for receiving guide pins, which serve the attachment of the ring gear, and wherein the holes have a shoulder, which is designed to serve as an abutment for cooperating with the guide pins guide sleeves.

The paragraph results from the provision of a suitably matched to the length of the coming guide sleeves used drilling depth of blind holes.

In a further embodiment of the base plate, the guide sleeves are designed to be introduced by means of a setting tool in the bore, wherein the shape and length of the setting tool is matched to the position of the paragraph such that the inserted guide sleeves always flush with the bottom of the base plate.

In particular, the inner diameter of the bore and the outer diameter of the guide sleeve should be coordinated so that a captive connection between the guide sleeve and the bore during insertion and withdrawal of the guide pins is ensured.

In a further aspect of the invention, a device is provided which consists of a base plate for arranging a sprocket and of a plurality of insertable in holes in the base plate guide sleeves for receiving guide pins, wherein the guide sleeves have at least one retention element, which is formed, the guide sleeves captive to keep in the holes.

In this way it can be prevented that the guide sleeves are accidentally pulled out of their mounting holes down or pushed.

• 1 eine perspektivische Ansicht einer Sockelplatte mit darauf aufgesetztem Zahnkranz;
• 2 eine Explosionsdarstellung der Sockelplatte mit Zahnkranz von unten;
• 3a einen Ansicht der Sockelplatte mit Zahnkranz von oben;
• 3b einen Schnitt entlang A-A aus 3a;
• 3c einen vergrößerten Ausschnitt aus 3b;
• 4a ein Setzwerkzeug zur Applikation einer Führungshülse;
• 4b eine Führungshülse in perspektivischer Ansicht; und
• 4c die Führungshülse in seitlicher Ansicht.

Further advantages and features will become apparent from the description of the embodiment shown in the accompanying drawings. Show it

• 1 a perspective view of a base plate with a sprocket mounted thereon;
• 2 an exploded view of the base plate with sprocket from below;
• 3a a view of the base plate with sprocket from above;
• 3b a section along AA 3a ;
• 3c an enlarged section 3b ;
• 4a a setting tool for application of a guide sleeve;
• 4b a guide sleeve in a perspective view; and
• 4c the guide sleeve in lateral view.

In the 1 is a base plate 1 shown for use in dental model making, the arrangement and attachment of a sprocket 2 serves as a saw model several segments 3 having.

On her bottom, like that 2 shows, has the base plate 1 several centering elements 5 and an adhesive element 9 , For example, a magnetic metal disc, on, with the help of which the base plate 1 For example, can be coupled to a receiving plate, not shown in the drawing in an articulator.

Furthermore, the base plate 1 several holes 4 for receiving guide sleeves 6 on. The guide sleeves 6 in turn serve to receive and guide guide pins 8th , with which, for example, produced by a rapid prototyping process sprocket 2 on the top of the base plate 1 can be detachably attached. These are in the sprocket 2 or in its individual segments 3 also corresponding holes 7 provided in which the guide pins 8th can slide.

Like the representations of the 3a to 3c show is the hole designed as a through hole 4 in sections as a kind of blind hole 13 designed to be such a paragraph 10 form, for the inserted guide sleeves 6 acts as an abutment, so that the guide sleeves 6 can not accidentally be pulled upwards, if, for example, the sprocket 2 or just his segments 3 from the base plate 1 be removed.

The guide sleeves 6 be in the blind holes 13 preferably pressed. Here are the guide sleeves 6 from the bottom of the base plate 1 with a specially designed setting tool 14 preferably introduced by hand, like the 4a illustrated. With the setting tool 14 The user can generate the pressure required for pressing. The placement depth with respect to the guide sleeves 6 is due to the location of the counter bearing 10 specified or limited.

Furthermore, the risk of unintentional ejection of the guide sleeves 6 down when placing the sprocket 2 on the base plate 1 to prevent or at least substantially reduce, is on the outer circumference of the guide sleeve 6 a retention element 15 , preferably in the form of an oversize, molded. This is the clamping effect between the guide sleeve 6 and bore 4 elevated. The guide pins 8th can facilitate threading in the guide sleeves 6 still with a circumferential chamfer 12 be provided.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102017002618 [0007]

Claims (4)

Base plate (1) for arranging a toothed ring (2) with arranged on its underside centering elements (5) and at least one arranged adhesive element (9), wherein the base plate (1) has bores (4) for receiving guide pins (8), the Serve attachment of the ring gear (2), characterized in that the bores (4) have a shoulder (10) which is designed to serve as an abutment for the guide pins (8) cooperating guide sleeves (6). Base plate after Claim 1 in which the guide sleeves (6) are designed to be introduced into the bore (4) by means of a setting tool (14), the shape and length of the setting tool (14) being matched to the position of the shoulder (10) such that Always lock the inserted guide sleeves (8) flush with the underside of the base plate (1). Base plate after Claim 1 or 2 , wherein the inner diameter of the bore (4) and the outer diameter of the guide sleeve (6) are coordinated so that a captive connection between the guide sleeve (6) and the bore (4) during insertion and withdrawal of the guide pins (8) is ensured , Device consisting of a base plate (1) for arranging a ring gear (2) and of a plurality of bores (4) in the base plate (1) insertable guide sleeves (6) for receiving guide pins (8), wherein the guide sleeves (6) at least one Retention element (15) which is adapted to hold the guide sleeves (6) captive in the holes (4).

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